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  1. Analgesia PCA por catéter interesternocleidomastoideo frente analgesia PCA intravenosa tras cirugía proximal de húmero Continuous Intersternocleidomastoid PCA analgesia Vs intravenous PCA analgesia after proximal shoulder surgery

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    R. Ortiz de la Tabla

    2008-10-01

    Full Text Available Introducción: Comparar la eficacia analgésica e incidencia de efectos adversos entre el bloqueo interesternocleidomastoideo continuo y una pauta analgésica intravenosa tras cirugía proximal de húmero. Material y Métodos: Estudio prospectivo descriptivo no aleatorizado de pacientes intervenidos de cirugía de hombro bajo anestesia general con fentanilo intravenoso como analgesia intraoperatoria. Al grupo 1 se realizó bloqueo interesternocleidomastoideo con ropivacaína 0,5% 0,4 mL Kg-1 y en URPA se comenzó una perfusión de ropivacaína 0,2% 5mL h-1, con bolos PCA 5 mL y tiempo de cierre de 30 minutos. Al grupo 2, a su llegada a la URPA se administró una dosis carga de metamizol 2 gr, tramadol 100 mgr y ondansetrón 4 mgr, seguido por una perfusión de metamizol 0,16%, tramadol 0,04% y ondansetrón 0,0016% a 1,5 mL h-1 bolos PCA 1 mL y tiempo de cierre 20 minutos. La variable principal fue la valoración del dolor postoperatorio, en reposo y movimiento, mediante escala verbal numérica de 0 (no dolor a 10 (máximo dolor y la aparición de efectos indeseables. Resultados: Se incluyeron 38 pacientes en el grupo 1 y 39 en el 2. La valoración del dolor postoperatorio puso de manifiesto valores más elevados en las primeras 24 horas al movimiento y a las 48 horas, tanto en reposo como al movimiento, en el grupo 2 (pObjectives: We have compared results in postoperative analgesia and incidence of side effects between a continuous intersternocleidotnastoid blockade and intravenous analgesia after proximal shoulder surgery. Methods: In a prospective no randomized study on patients scheduled for unilateral shoulder surgery under general anaesthesia with intravenous fentanil as intraoperative analgesia. In group 1, a continuous intersternocleidomastoid blockade was performed with a bolus of ropivacaine 0,5% 0,4 mL/kg before surgery and a postoperative patient-controlled analgesia (PCA infusión pump of 0,2% ropivacaine (5ml/h, PCA bolus 5 mi / 30

  2. Estudio descriptivo de la analgesia obtenida durante el trabajo de parto con PCA de remifentanilo: modelo británico

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    C. Morales Muñoz

    2014-12-01

    Full Text Available Introducción: la analgesia epidural obstétrica continúa siendo el "gold-standard" para controlar el dolor durante el trabajo de parto, pero en determinadas ocasiones la técnica está contraindicada o la analgesia es incompleta. El remifentanilo es un opioide potente de rápida acción y vida media ultracorta, que se adapta perfectamente a la dinámica del parto. La coordinación entre el comienzo de las contracciones y la administración del fármaco mediante un dispositivo PCA hacen que esta técnica pueda ser considerada de elección para el alivio de dolor durante el parto y no solo como alternativa a la epidural. Objetivo: este estudio pretende valorar la eficacia y seguridad en el parto del remifentanilo administrado por vía intravenosa, así como la satisfacción materna de la analgesia recibida. Materiales y métodos: estudio descriptivo prospectivo basado en el análisis de la recogida de datos realizado por los investigadores durante el parto donde se recoge el dolor durante la dilatación y el expulsivo antes y después de la aplicación de la PCA de remifentanilo, así como las complicaciones y la incidencia de efectos secundarios. Paralelamente se realiza una encuesta de satisfacción materna de la técnica recibida y su vivencia personal. Resultados: se han recogido un total de 32 casos durante el periodo de estudio (6 meses. Todas las pacientes han presentado una reducción de dolor manifestado por una disminución del EVA respecto del dolor basal de 5,9 puntos en los primeros minutos, 4,6 puntos en completa y 3,4 en el expulsivo. No se han registrado complicaciones materno-fetales importantes derivadas de la técnica. La satisfacción materna ha sido alta, volviendo incluso a repetir la técnica en un 90 % de los casos. Conclusiones: la PCA de remifentanilo ha demostrado ser efectiva y segura como analgesia obstétrica. Es por ello que la PCA ha teniendo una amplia aceptación entre matronas, ginecólogos y anestesiólogos en

  3. Considerações sobre analgesia controlada pelo paciente em hospital universitário Consideraciones sobre analgesia controlada por el paciente en hospital universitario Patient controlled analgesia in a university hospital

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    Guilherme Antônio Moreira de Barros

    2003-02-01

    ás utilizado (54,2%, siendo la vía peridural la que tiene preferencia (49,5%. La escala numérica verbal media fue de 0,8 (0-10. Los efectos colaterales ocurrieron en 22,4% de los enfermos tratados. CONCLUSIONES: Los resultados fueron considerados excelentes en lo que se refiere a la calidad de la analgesia, no obstante con ocurrencia de efectos colaterales indeseables, siendo que hubo buena aceptación de la técnica de analgesia por las clínicas atendidas.BACKGROUND AND OBJECTIVES: The rapid development seen in recent years in surgical and anesthetic techniques allowed for an increased indication of invasive procedures. At the same time, with the aging of the population, the postoperative recovery period became the focus of major concern for the healthcare team. For such, new analgesic techniques were developed, among them, Patient Controlled Analgesia (PCA. In Brazil, the Acute Pain Service (SEDA of the Anesthesiology Department, Botucatu Medical School - UNESP, has been using PCA for many years. Aiming at verifying the quality of the service provided, this research has evaluated the efficacy and safety of the technique, in addition to identifying and characterizing patients submitted to PCA. METHODS: Participated in this retrospective study 679 patients treated by SEDA with the PCA method only, during a 3-year period. Patients were randomly included in the study with no restrictions concerning age, gender and type of surgery, considering only the possibility of PCA. The following parameters were evaluated: gender, age, type of surgery, pain score, treatment duration, analgesic drugs used, administration route, side effects and complications. RESULTS: The PCA technique was used in 3.96% of patients submitted to surgical procedures and in 1.64% of all hospitalized patients. Thoracic surgeries were the most frequent procedures and accounted for 25% of patients. Morphine was the most commonly used analgesics (54.2% and the epidural route was the most frequent route of

  4. Analgesia del Trabajo de Parto con Remifentanilo por vía intravenosa mediante un Sistema de Analgesia Controlada por la Paciente (PCIA Labour analgesia with Remifentanil by PCIA

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    J. M. López-Millán

    2007-08-01

    Full Text Available Objetivo: Valorar la eficacia analgésica y seguridad en el parto de Remifentanilo por vía intravenosa mediante un sistema de analgesia controlada por la paciente. Material y Método: El grupo de estudio lo componen 25 gestantes sanas, primigestas a término, con parto eutócico instaurado, que solicitan analgesia durante el trabajo de parto. Resultados: Se produce un alivio significativo del dolor desde la primera hora de tratamiento en todos los casos. La analgesia se mantiene hasta el final en el 80% de los casos. El 20% restante solicitó anestesia regional en el período expulsivo. Se produjo un grado de sedación de leve a moderado durante todo el estudio, que las pacientes valoraron positivamente. Solo en dos casos el grado de sedación fue moderado-severo, a pesar de lo cual las gestantes decidieron continuar en el estudio. No se registraron efectos adversos materno-fetales. Conclusiones: La analgesia del parto con Remifentanilo por vía intravenosa controlada por la paciente es un método efectivo y presenta un aceptable perfil de seguridad materno y fetal.Objective: To assess the analgesic efficacy of patient-controlled in-travenous analgesia with remifentanil and its potential side effects during labour. Method: We analyzed 25 healthy nulliparas at full term pregnancy, in established uncomplicated labour, who demanded pain relief. Results: All the patients experienced a significant pain relief during the first hour of treatment which was maintained on until delivery on 80%. The other 20% required additional regional anaesthesia at the end of second stage. The level of sedation was mild to moderate and treatment was well tolerated except for two, who presented heavy sedation. No maternal or neonatal side effects were registered. Conclusions: Patient-controlled intravenous analgesia with remifentanil is effective for labour pain relief and produces no major maternal and neonatal side effects.

  5. Intravenous sufentanil and morphine for post-cardiac surgery pain relief using patient-controlled analgesia (pca) device: a randomized double-blind clinical trial

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    Selection of the best analgesic technique in patients undergoing major surgeries can result in lower morbidity and satisfactory postoperative pain relief. In the present study, we tried to compare the effect of morphine and sufentanil on postoperative pain severity and hemodynamic changes by using patient-controlled analgesia (PCA) device in patients who were candidate for coronary artery bypass surgery (CABG). It was a randomized double-blinded clinical trial in which 120 patients aged 30-65 years, ASA physical status I-III, candidate for CABG in Shahid Rajaee hospital in Tehran were included. Before anesthesia, patients were randomly assigned to one of three groups to receive sufentanil (n=40), morphine (n=40) or normal saline (n=40). After tracheal extubation at intensive care unit, PCA was started by, sufentanil 4mg for the first group, morphine 2mg for the second group and normal saline, at same volume for the third group, intravenously with 10 minute lockout interval. Postoperative pain was evaluated by VAS scale, 1, 6, 12, 18 and 24 hours after extubation and systolic blood pressure, arterial oxygen saturation, PCO2 and PO2 were recorded 24 hours after extubation. VAS scores at rest revealed significantly less pain for patients in sufentanil and morphine groups than normal saline group, throughout the twenty-four hours after operation (P<0.001). However, there were no significant differences in the means of VAS scores between sufentanil and morphine groups. Among studied hemodynamic parameters, only systolic blood pressure was reduced more in morphine than sufentanil group (P<0.001). After CABG surgery, administration of intravenous sufentanil and morphine using PCA can lead to similar reduction of postoperative pain severity. (author)

  6. Abscesso peridural após analgesia controlada pelo paciente por via peridural: relato de caso

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    Abreu Múcio Paranhos de

    2004-01-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: A analgesia peridural é freqüentemente utilizada para o controle da dor pós-operatória ou para tratamento da dor crônica em pacientes oncológicos. No entanto, não está isenta de complicações. Neste caso, relatamos a ocorrência de abscesso peridural em paciente jovem, hígida, que foi submetida a analgesia peridural em bomba de infusão controlada pela paciente, que apresentou abscesso peridural, sendo necessária descompressão cirúrgica. RELATO DO CASO: Paciente do sexo feminino, 24 anos, 56 kg, 1,65 m, estado físico ASA I, com história de lombalgia e dificuldade de flexão da coxa esquerda, foi submetida à cirurgia para liberação da musculatura posterior do quadril. Três dias após a alta hospitalar retornou ao hospital queixando-se de dor no local da incisão cirúrgica e durante a realização dos exercícios fisioterápicos. Foi internada e programada analgesia controlada pelo paciente (ACP por via peridural, para possibilitar o tratamento fisioterápico. No centro cirúrgico foi feita sedação por via venosa com midazolam (2,5 mg e fentanil (25 µg, anti-sepsia da pele e realizada punção peridural no espaço L3-L4. Após dose teste foram injetados ropivacaína a 0,75% (75 mg e fentanil (100 µg e passado cateter peridural em sentido cefálico, sem intercorrências. Foi instalada bomba de ACP contendo solução fisiológica a 0,9% (85 ml, bupivacaína a 0,5% (25 mg e fentanil (500 µg, programada com fluxo constante de 4 ml.h-1 e bolus de 2 ml a cada 20 minutos. No 3º dia a paciente relatou incômodo no local da inserção do cateter, sendo o mesmo retirado. Havia discreta hiperemia no local. Após vinte e dois dias, a paciente retornou ao hospital com dor de grande intensidade na região lombossacra com irradiação para os membros inferiores e limitação dos movimentos. Não havia deficit neurológico ou sinais flogísticos no local da punção ou na ferida operatória. Foi feita hip

  7. Investigação da qualidade de farinhas enriquecidas utilizando Análise por Componentes Principais (PCA Enriched flour quality investigation using Principal Component Analysis (PCA

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    Bruno Thiago Soeiro

    2010-09-01

    Full Text Available Alguns países, incluindo o Brasil (RDC 344, 2002, instituíram uma regulamentação indicando que farinhas de milho e trigo devem ser enriquecidas com ácido fólico e ferro. O principal objetivo deste trabalho foi a avaliação de algumas características de farinhas enriquecidas usando a Análise por Componentes Principais (PCA. Parâmetros como o teor de ácido fólico, ferro, proteína, lipídios, umidade, cinzas e carboidratos foram avaliados em 30 embalagens de farinhas adquiridas em comércio local. As farinhas de trigo e milho apresentaram, em média, composição centesimal aceitável de acordo com a Legislação Brasileira. Para as farinhas de trigo, a concentração de ácido fólico estava, em média, próxima ao esperado. As farinhas de milho continham quantidade superior da vitamina. Para os dois tipos de farinha, constatou-se teor de ferro acima do valor declarado no rótulo dos produtos. Uma matriz com 30 linhas (amostras e 7 colunas (variáveis foi organizada e os dados foram autoescalados. A primeira informação observada foi uma clara diferenciação entre os tipos de farinhas. As farinhas de trigo foram caracterizadas por maior quantidade de proteínas, umidade e cinzas. Por outro lado, as farinhas de milho apresentaram maior concentração de ferro, lipídios, carboidratos e ácido fólico. Foi possível notar também que farinhas acondicionadas em embalagens de plástico apresentaram menor quantidade de ácido fólico (152 µg.100 g-1, em média, quando comparadas às amostras armazenadas em embalagens de papel (259 µg.100 g-1, em média. Esse estudo pode fornecer ferramentas importantes para a avaliação dos programas de enriquecimento de alimentos com ácido fólico, principalmente, por apontar, preliminarmente, para a importância do tipo de embalagem para o acondicionamento das farinhas enriquecidas com a vitamina.Some countries, including Brazil (resolution - RDC # 344, 2004, have issued a regulation stipulating

  8. Clonidina e dexmedetomidina por via peridural para analgesia e sedação pós-operatória de colecistectomia Clonidina y dexmedetomidina por vía peridural para analgesia y sedación pós-operatoria de colecistectomía Epidural clonidine or dexmedetomidine for post-cholecystectomy analgesia and sedation

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    Antônio Mauro Vieira; Taylor Brandão Schnaider; Antônio Carlos Aguiar Brandão; Flávio Aparecido Pereira; Everaldo Donizeti Costa; Carlos Eduardo Povoa Fonseca

    2004-01-01

    JUSTIFICATIVA E OBJETIVOS: A clonidina e a dexmedetomidina são agonistas alfa2-adrenérgicos que, quando administrados por via peridural, possuem propriedades analgésicas e potencializam os efeitos dos anestésicos locais. A presente pesquisa objetivou avaliar a analgesia e a sedação produzidas pela clonidina ou dexmedetomidina associadas à ropivacaína, por via peridural, no pós-operatório de colecistectomia por via subcostal. MÉTODO: Participaram do estudo aleatório e duplamente encoberto 40 p...

  9. Clonidina e dexmedetomidina por via peridural para analgesia e sedação pós-operatória de colecistectomia Clonidina y dexmedetomidina por vía peridural para analgesia y sedación pós-operatoria de colecistectomía Epidural clonidine or dexmedetomidine for post-cholecystectomy analgesia and sedation

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    Antônio Mauro Vieira

    2004-08-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: A clonidina e a dexmedetomidina são agonistas alfa2-adrenérgicos que, quando administrados por via peridural, possuem propriedades analgésicas e potencializam os efeitos dos anestésicos locais. A presente pesquisa objetivou avaliar a analgesia e a sedação produzidas pela clonidina ou dexmedetomidina associadas à ropivacaína, por via peridural, no pós-operatório de colecistectomia por via subcostal. MÉTODO: Participaram do estudo aleatório e duplamente encoberto 40 pacientes, de ambos os sexos, com idade variando de 18 a 50 anos, peso entre 50 e 100 kg, estado físico ASA I e II, submetidos à colecistectomia por via subcostal, os quais foram distribuídos em dois grupos: clonidina (GC, em que foi administrada clonidina (1 ml = 150 µg associada à ropivacaína a 0,75% (20 ml por via peridural; dexmedetomidina (GD, em que foi injetada dexmedetomidina (2 µg.kg-1 associada à ropivacaína a 0,75% (20 ml por via peridural. A analgesia e a sedação foram observadas 2, 6 e 24 horas após o término da anestesia. RESULTADOS: Ocorreu sedação depois de 2 e 6 horas em ambos os grupos, sendo que houve diferença estatística significante entre os tempos de 2 e 6 horas no grupo dexmedetomidina. Houve analgesia em ambos os grupos, especialmente depois de 2 e 6 horas. Foi detectada diferença estatística significante entre os tempos de 2, 6 e 24 horas no grupo dexmedetomidina; no grupo clonidina essa diferença estatística significante foi observada entre os tempos de 2 e 6 horas e entre 2 e 24 horas. CONCLUSÕES: Os resultados permitiram concluir que a clonidina ou a dexmedetomidina associadas à ropivacaína a 0,75% asseguraram analgesia e sedação nos tempos de observação de 2 e 6 horas após o término da anestesia, nos pacientes submetidos à colecistectomia por via subcostal e que a clonidina promove analgesia mais prolongada.JUSTIFICATIVA Y OBJETIVOS: La clonidina y la dexmedetomidina son agonistas alfa2

  10. Analgesia pós-toracotomia com associação de morfina por via peridural e venosa Analgesia pós-toracotomia con asociación de morfina por vía peridural y venosa Comparison of intravenous and epidural morphine analgesia after thoracotomy

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    Neuber Martins Fonseca

    2002-09-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: Analgesia após cirurgia de tórax é feita por diferentes métodos. O objetivo do estudo foi avaliar a analgesia pós-operatória com associação de morfina por via venosa e peridural, comparada ao uso por via isolada. MÉTODO: Foram estudados 20 pacientes submetidos à cirurgia de tórax, ambos os sexos, estado físico ASA I a III. Foi feita medicação pré-anestésica com midazolam por via venosa (3 a 3,5 mg na SO. A monitorização constou de ECG contínuo, pressão arterial invasiva, oximetria de pulso, capnografia, PVC, diurese e temperatura. Primeiramente foi realizada anestesia peridural contínua, T7-T8 com 10 ml de bupivacaína a 0,25% e, em seguida, indução com fentanil (5 µg.kg-1, etomidato (0,2 a 0,3 mg.kg-1 e succinilcolina (1 mg.kg-1. Foi feita IOT com tubo de duplo lume, complementação com pancurônio (0,08 a 0,1 mg.kg-1 e ventilação controlada mecânica. Os pacientes foram então distribuídos aleatoriamente em três grupos. Ao Grupo I, administrou-se pelo cateter peridural, 2 mg de morfina 0,1% na indução da anestesia (M1, após 12 horas (M2 e 24 horas (M3 do final da cirurgia, ao Grupo II, morfina por via venosa em bomba de infusão (15 µg.kg.h-1 precedida de bolus de 50 µg.kg-1, durante 30 horas e ao Grupo III, morfina por via peridural na dose de 0,5 mg em M1, M2 e M3, associada com morfina venosa em bomba de infusão (8 µg.kg.h-1 precedida de bolus de 25 µg.kg-1, por 30 horas. Análise de gases arteriais, freqüências cardíaca e respiratória, presença de prurido, náuseas, vômitos e analgesia pós-operatória foram avaliados a cada 6 horas, até um total de 30 horas do pós-operatório. A analgesia foi avaliada por escala de graduação numérica (EGN de 0 a 10. RESULTADOS: A EGN apresentou redução no grupo I apenas no momento M2 não ocorrendo nos demais intervalos. Nos grupos II e III ocorreu redução da dor a partir de 18 horas em relação aos valores iniciais e em rela

  11. Abscesso do músculo psoas em paciente submetida à analgesia por via peridural: relato de caso Absceso del músculo psoas en paciente sometida a analgesia por vía peridural: relato del caso Psoas muscle abscess after epidural analgesia: case report

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    Durval Campos Kraychete

    2007-04-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: O abscesso do músculo psoas é uma complicação rara da analgesia peridural. O manuseio adequado dessa intercorrência é fundamental para uma boa resolução do quadro clínico. O objetivo deste relato foi discutir o diagnóstico e o tratamento do abscesso do músculo psoas. RELATO DO CASO: Paciente do sexo feminino, 65 anos, com dor neuropática nos membros inferiores de difícil controle com medicamentos por via sistêmica. Optou-se pela administração de opióide e anestésico local por via peridural como alternativa analgésica. Vinte dias após o uso contínuo da via peridural, a paciente começou a apresentar dor na região lombar, cefaléia e febre. A tomografia computadorizada da pelve revelou abscesso do músculo psoas, sendo indicada drenagem fechada e antibioticoterapia. CONCLUSÕES: A supervisão minuciosa do paciente é necessária e deve ser contínua quando um cateter peridural for colocado. Essa vigilância deve ser mantida após a sua retirada.JUSTIFICATIVA Y OBJETIVOS: El absceso del músculo psoas es una complicación rara de la analgesia peridural. El manoseo adecuado de esa situación intercurrente es fundamental para una buena resolución del cuadro clínico. El objetivo de este relato fue discutir el diagnóstico y el tratamiento del absceso del músculo psoas. RELATO DEL CASO: Paciente del sexo femenino, 65 años, con dolor neuropático en los miembros inferiores de difícil control con medicamentos por vía sistémica. Se optó por la administración de opioide y anestésico local por vía peridural como alternativa analgésica. Veinte días después del uso continuo de la vía peridural, la paciente empezó a presentar dolor en la región lumbar, cefalea y fiebre. La tomografía computadorizada de la pelvis reveló absceso del músculo psoas, siendo indicado el drenado cerrado y antibioticoterapia. CONCLUSIONES: La supervisión minuciosa del paciente es necesaria y debe ser continua cuando

  12. Analgesia intra-articular com morfina, bupivacaína ou fentanil após operação de joelho por videoartroscopia

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    Souza Rogério Helcias de; Issy Adriana Machado; Sakata Rioko Kimiko

    2002-01-01

    JUSTIFICATIVA E OBJETIVOS: O uso de métodos que promovam analgesia para dor do joelho sem prejudicar a função motora tem sido bastante pesquisado. O objetivo do presente estudo foi comparar o efeito analgésico da morfina, da bupivacaína e do fentanil, com a solução fisiológica, injetada por via intra-articular após operação de joelho por videoartroscopia. MÉTODO: Sessenta pacientes foram divididos de forma aleatória, em quatro grupos: GI (n=15) - 10 ml de solução fisiológica; GII (n = 15) - 2...

  13. Analgesia pós-operatória em cirurgia ortopédica: estudo comparativo entre o bloqueio do plexo lombar por via perivascular inguinal (3 em 1 com ropivacaína e a analgesia subaracnóidea com morfina Analgesia pós-operatoria en cirugía ortopédica: estudio comparativo entre el bloqueo del plexo lombar por vía perivascular inguinal (3 en 1 con ropivacaína y la analgesia subaracnóidea con morfina Postoperative analgesia following orthopedic surgery: a study comparing perivascular lumbar plexus inguinal block with ropivacaine (3 in 1 and spinal anesthesia with morphine

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    Neuber Martins Fonseca

    2003-04-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: O bloqueio do plexo lombar pelo acesso perivascular inguinal, chamado de bloqueio 3 em 1, tem sido utilizado para analgesia pós-operatória. O objetivo deste estudo foi comparar a analgesia pós-operatória do bloqueio 3 em 1 a da morfina subaracnóidea em pacientes submetidos a cirurgias ortopédicas em membro inferior (MI. MÉTODO: Foram estudados 40 pacientes escalados para cirurgia ortopédica de MI, de ambos os sexos, estado físico ASA I e II, com idades entre 15 e 75 anos, distribuídos em 2 grupos (M e BPL. Foi realizada anestesia subaracnóidea em todos os pacientes, em L3-L4 ou L4-L5, com 20 mg de bupivacaína isobárica a 0,5%. No grupo M (n = 20 foi associado 50 µg de morfina ao anestésico local. No grupo BPL (n = 20 foi realizado o bloqueio 3 em 1 ao término da cirurgia, utilizando 200 mg de ropivacaína a 0,5%. Avaliou-se a analgesia e a intensidade da dor às 4, 8, 12, 14, 16, 20 e 24 horas após o término da cirurgia, o nível do bloqueio subaracnóideo, o tempo cirúrgico e as complicações. RESULTADOS: A duração da analgesia no grupo BPL foi de 13,1 ± 2,47, enquanto no grupo M todos os pacientes referiam dor e ausência de bloqueio motor no primeiro instante avaliado (4 horas. Houve falha do bloqueio de um dos 3 nervos em 3 pacientes. A incidência de náusea e prurido foi significativamente maior no grupo M. Quanto à retenção urinária, não houve diferença significante entre os grupos. Não houve depressão respiratória, hipotensão arterial ou bradicardia. A analgesia pós-operatória foi mais efetiva no grupo BPL, comparada ao grupo M às 4, 8, 12,14 e 16 horas. Às 20 e 24 horas não houve diferença significante entre os grupos. CONCLUSÕES: A analgesia pós-operatória proporcionada pelo bloqueio 3 em 1 apresentou efeitos colaterais inferiores à morfina subaracnóidea com tempo de analgesia semelhante.JUSTIFICATIVA Y OBJETIVOS: El bloqueo del plexo lumbar por el acceso

  14. Analgesia continua de miembro superior por bloqueo de plexo braquial en dolor crónico oncológico Continuous analgesia of the upper limb with brachial plexus blockade in chronic cancer pain

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    M. Narváez; K. Glasinovic; A. Condori; A. Ballon; M. Torres

    2005-01-01

    Objetivo: Evaluar la utilizdad del bloqueo del plexo braquial en el tratamiento del dolor intenso oncológico. Método: Evaluamos en 6 pacientes con metástasis óseas del miembro superior la efectividad de un bloqueo continuo del plexo braquial. Resultados: Todos los pacientes del estudio tuvieron una evolución favorable y un incremento en la analgesia con el tratamiento sin que se produjeran efectos adversos. Conclusiones: La analgesia continua del plexo braquial es un método efectivo para el c...

  15. Uso do exercício resistido antagonizado por naloxone como fator de analgesia em sinovite aguda de joelho de ratos Wistar

    Directory of Open Access Journals (Sweden)

    Gladson Ricardo Flor Bertolini

    2012-04-01

    Full Text Available A analgesia advinda do exercício físico pode ocorrer via liberação de opioides endógenos, no sistema nervoso central e na periferia. Contudo, a literatura ainda é controversa sobre vias e ações do exercício na dor. Assim, o objetivo da pesquisa foi avaliar se o exercício resistido produz alterações sobre o quadro nociceptivo e se sofre interferências pela aplicação de um inibidor de opioides. Foram utilizados 18 ratos, divididos em três grupos: G1 - hiperalgesia no joelho direito e não tratados; G2 - hiperalgesia e tratados com saltos em meio aquático; G3 - hiperalgesia, com prévia injeção de naloxone e posterior saltos. Para produzir a hiperalgesia, foi injetado no espaço articular tibiofemoral 100µl de formalina 5%. Para avaliação da dor foi utilizado o filamento de Von Frey digital na face medial da articulação tibiofemoral direita. Os momentos de avaliação foram: pré-lesão (AV1, após 15 (AV2 e 30 (AV3 minutos e uma hora (AV4. O exercício foi saltos em meio aquático e ocorreu após AV2. Com sobrecarga de 50% do peso, o animal realizou quatro séries de cinco saltos, com intervalo de três minutos. Para G1, houve aumento nociceptivo, com redução significativa e volta dos valores iniciais em AV4; G2 mostrou, após o exercício físico, restauração do limiar, com retorno aos valores basais; para G3, houve diminuição do limiar, sem restauração ou aumento significativo do mesmo. Conclui-se que houve analgesia com uso do exercício físico e que a mesma foi alterada por bloqueador de betaendorfina.

  16. Analgesia caudal continua guiada por ultrasonido en una paciente de 4 años Caudal anesthesia ultrasound-guided continuos flow in patient 4 years

    Directory of Open Access Journals (Sweden)

    A. Beltrán Franco

    2013-02-01

    Full Text Available La epidural caudal es la técnica más popular en anestesia y analgesia regional pediátrica. El empleo de una guía ecográfica en este procedimiento, aunque aún no es un estándar, podría disminuir los riesgos inherentes a la técnica tradicional y ofrecer algunas ventajas. Nosotros describimos el caso de una niña de 4 años sometida a una resección de un rabdomiosarcoma en muslo izquierdo con metástasis ganglionar inguinal e implantación de catéteres para braquiterapia; a quien se le colocó un catéter caudal para analgesia postoperatoria continua, usando la ultrasonografía (US como método para guiar la colocación de dicho catéter. Después de inducir anestesia general, se realizó un escaneo ecográfico previo de la zona sacra identificando la anatomía, posteriormente después de implementar las medidas antisépticas y asépticas se colocó un catéter caudal guiado por US en tiempo real y con modo Doppler color se confirmó la posición en el espacio epidural caudal al inyectar una dosis en bolo de mezcla anestésica. Se presentó un adecuado control del dolor postoperatorio. El uso de US es una excelente alternativa a las técnicas clásicas fundamentadas en anatomía para la inserción de catéteres epidurales continuos en pediatría y permite ciertas ventajas que las técnicas a ciegas no pueden brindar.Caudal epidural is the most popular regional analgesia and anesthesia technique in pediatrics. The use of ultrasound (US guidance in this procedure, is not yet the standard, but could reduce the risks related with the traditional approach and offer some advantages. We described a case of a 4-years-old patient undergoing a resection of a rabdomyosarcome on the left thigh plus inguinal metastatic nodes and implantation of brachitherapy catheters, in whom a continous caudal epidural catheter was placed under US guidance. After general anesthesia induction, a scout scanning identified the anatomy and afterwards, using strict

  17. Analgesia intra-articular com morfina, bupivacaína ou fentanil após operação de joelho por videoartroscopia Analgesia intra-articular con morfina, bupivacaína o fentanil después de operación de rodilla por videoartroscopia Intra-articular analgesia with morphine, bupivacaine or fentanyl after knee video-arthroscopy surgery

    Directory of Open Access Journals (Sweden)

    Rogério Helcias de Souza

    2002-09-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: O uso de métodos que promovam analgesia para dor do joelho sem prejudicar a função motora tem sido bastante pesquisado. O objetivo do presente estudo foi comparar o efeito analgésico da morfina, da bupivacaína e do fentanil, com a solução fisiológica, injetada por via intra-articular após operação de joelho por videoartroscopia. MÉTODO: Sessenta pacientes foram divididos de forma aleatória, em quatro grupos: GI (n=15 - 10 ml de solução fisiológica; GII (n = 15 - 2 mg de morfina diluídos para 10 ml de solução fisiológica; GIII (n = 15 - 10 ml de bupivacaína a 0,25%; GIV (n = 15 - 100 µg de fentanil diluídos para 10 ml de solução fisiológica, injetados ao término da operação. Todos os pacientes foram submetidos à anestesia subaracnóidea com 15 mg de bupivacaína hiperbárica. A intensidade da dor foi avaliada pela escala analógica visual (imediatamente após o término da operação e após 6, 12, 18 e 24 horas, bem como a necessidade de complementação analgésica (dipirona 1 g por via venosa. Foram anotados os possíveis efeitos colaterais. RESULTADOS: Não houve diferença significativa na intensidade da dor entre os grupos, na quase totalidade dos tempos estudados. Houve diferença estatística até seis horas, quando o grupo fentanil apresentou intensidade da dor significativamente menor. O grupo morfina necessitou de maior número de complementações com dipirona. Os efeitos colaterais foram mínimos, sem significância estatística. CONCLUSÕES: Não houve diferença significativa entre a analgesia promovida pelas soluções estudadas na maioria dos tempos investigados.JUSTIFICATIVA Y OBJETIVOS: El uso de métodos que promuevan analgesia para el dolor de rodilla sin perjudicar la función motora ha sido bastante pesquisado. El objetivo del presente estudio fue comparar el efecto analgésico de la morfina, de la bupivacaína y del fentanil, con la solución fisiológica, inyectada

  18. Preventive analgesia

    DEFF Research Database (Denmark)

    Dahl, Jørgen B; Kehlet, Henrik

    2011-01-01

    This paper will discuss the concepts of pre-emptive and preventive analgesia in acute and persistent postsurgical pain, based on the most recent experimental and clinical literature, with a special focus on injury-induced central sensitization and the development from acute to chronic pain. Recent...... findings: The nature of central sensitization during acute and chronic postsurgical pain share common features, and there may be interactions between acute and persistent postoperative pain. The term ‘pre-emptive analgesia’ should be abandoned and replaced by the term ‘preventive analgesia’. Recent studies...... of preventive analgesia for persistent postoperative pain are promising. However, clinicians must be aware of the demands for improved design of their clinical studies in order to get more conclusive answers regarding the different avenues for intervention. Summary: The concept of preventive...

  19. Diclofenaco por via muscular ou retal associado com baixas doses de morfina subaracnóidea para analgesia pós-operatória em cesarianas Diclofenaco por vía muscular o rectal asociado con bajas dosis de morfina subaracnóidea para analgesia pós-operatoria en cesáreas Intramuscular versus rectal diclofenac associated with low dose spinal morphine for post-cesarean analgesia

    Directory of Open Access Journals (Sweden)

    Mônica Maria Siaulys Capel Cardoso

    2002-11-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: O diclofenaco tem sido utilizado em combinação com opióides por via subaracnóidea no controle da dor pós-operatória; entretanto, a melhor forma de sua administração não é conhecida. Este estudo avaliou a qualidade da analgesia pós-operatória de diferentes esquemas de administração de diclofenaco, em pacientes submetidas à cesariana sob raquianestesia com bupivacaína e morfina. MÉTODO: Após o final da cirurgia, as pacientes foram distribuídas aleatoriamente em três grupos que receberam diclofenaco como se segue: G50VR (n=62, 50 mg por via retal; G50IM (n=62, 50 mg por via muscular e G75IM (n=62, 75 mg por via muscular. A dor foi avaliada com uma escala analógica visual de 0-10 cm (EAV a cada 30 minutos nas primeiras seis horas e meperidina, via venosa, foi administrada como medicação de resgate sempre que a EAV fosse igual ou maior que 3 cm. RESULTADOS: No intervalo entre 30 e 150 minutos após a administração do diclofenaco, a média da intensidade de dor no grupo G50VR (0,9 ± 1,4; 1,4 ± 1,4; 1,3 ± 1,5; 1,3 ± 1,2 e 1,5 ± 3,3 cm foi maior quando comparada com as do G50IM (0,4 ± 0,8; 0,5 ± 0,8; 0,7 ± 1,0; 0,7 ± 1,1 e 0,7 ± 1,1 cm e G75IM (0,4 ± 0,8; 0,7 ± 1,3; 0,7 ± 1,1; 0,8 ± 1,2 e 0,7 ± 1,0 cm. A necessidade de meperidina de resgate (43,5% e o consumo total de meperidina (21,3 ± 28,9 mg foram maiores no G50VR, quando comparados com G50IM (21% e 8,2 ± 18,2 mg e G75IM (19,4% e 6,8 ± 16,7 mg. CONCLUSÕES: Quando combinada com baixas doses de morfina subaracnóidea, a administração do diclofenaco por via muscular promove melhor analgesia pós-operatória que por via retal. Além disso, parece haver um efeito teto para esta droga, já que não se observam vantagens com doses superiores a 50 mg por via muscular.JUSTIFICATIVA Y OBJETIVOS: El diclofenaco ha sido utilizado en combinación con opioides por vía subaracnóidea en el control del dolor pós-operatorio; mientras que, la

  20. Efeito preemptivo da morfina por via venosa na analgesia pós-operatória e na resposta ao trauma cirúrgico Efecto preemptivo de la morfina por vía venosa en la analgesia pós-operatoria y en la respuesta al trauma quirúrgico The effect of preemptive intravenous morphine on postoperative analgesia and surgical stress response

    Directory of Open Access Journals (Sweden)

    Levent Kiliçkan

    2001-12-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: Embora os primeiros estudos sobre analgesia preemptiva tenham demonstrado que o bloqueio pré-operatório com anestésicos locais ou a medicação pré-anestésica com opióides sistêmicos eram mais eficazes no alívio da dor pós-operatória do que qualquer outro tratamento, o resultado de outros estudos comparando os efeitos do tratamento pré operatório ao mesmo tratamento iniciado após a cirurgia, produziram efeitos inconsistentes. As razões para essa falta de consistência não são claras. São poucos os estudos sobre a relação entre analgesia preemptiva e o consumo de analgésicos e a resposta ao trauma cirúrgico. O objetivo deste estudo foi avaliar o efeito preemptivo da morfina por via venosa preemptiva no consumo pós-operatório de analgésicos e na resposta ao trauma cirúrgico. MÉTODO: Participaram deste estudo 60 pacientes, estado físico ASA I ou II, com idades entre 20 e 60 anos, escalados para histerectomia abdominal total e salpingo-ooferectomia bilateral, que foram aleatoriamente distribuídos em três grupos de 20 pacientes. Grupo I (n=20 - 0,15 mg.kg-1 de morfina após a indução anestésica e soro fisiológico durante o fechamento do peritônio. Grupo II (n=20 - soro fisiológico após a indução e 0,15 mg.kg-1 de morfina durante o fechamento do peritônio. Grupo III (n=20 soro fisiológico durante a indução e o fechamento do peritônio. Foram medidos os níveis sangüíneos de cortisol e de glicose e feita a contagem de leucócitos nos períodos pré e pós-operatórios. RESULTADOS: O consumo total de morfina pós-operatória foi significativamente mais baixo no grupo I comparado ao grupo III (p JUSTIFICATIVA Y OBJETIVOS: No obstante los primeros estudios sobre analgesia preemptiva hayan demostrado que el bloqueo pré-operatorio con anestésicos locales o la medicación pré-anestésica con opioides sistemicos eran mas eficaces en el alivio del dolor pós-operatorio de que cualquier

  1. PCA-induced respiratory depression simulating stroke following endoluminal repair of abdominal aortic aneurysm: a case report

    OpenAIRE

    Ahmad Javed; Riley Richard; Sieunarine Kishore

    2007-01-01

    Abstract Aim To report a case of severe respiratory depression with PCA fentanyl use simulating stroke in a patient who underwent routine elective endoluminal graft repair for abdominal aortic aneurysm (AAA) Case presentation A 78-year-old obese lady underwent routine endoluminal graft repair for AAA that was progressively increasing in size. Following an uneventful operation postoperative analgesia was managed with a patient-controlled analgesia (PCA) device with fentanyl. On the morning fol...

  2. Analgesia pós-operatória em cirurgia ortopédica: estudo comparativo entre o bloqueio do plexo lombar por via perivascular inguinal (3 em 1) com ropivacaína e a analgesia subaracnóidea com morfina Analgesia pós-operatoria en cirugía ortopédica: estudio comparativo entre el bloqueo del plexo lombar por vía perivascular inguinal (3 en 1) con ropivacaína y la analgesia subaracnóidea con morfina Postoperative analgesia following orthopedic surgery: a study comparing perivascular lumbar plexus inguinal block with ropivacaine (3 in 1) and spinal anesthesia with morphine

    OpenAIRE

    Neuber Martins Fonseca; Roberto Araújo Ruzi; Fernando Xavier Ferreira; Fabrício Martins Arruda

    2003-01-01

    JUSTIFICATIVA E OBJETIVOS: O bloqueio do plexo lombar pelo acesso perivascular inguinal, chamado de bloqueio 3 em 1, tem sido utilizado para analgesia pós-operatória. O objetivo deste estudo foi comparar a analgesia pós-operatória do bloqueio 3 em 1 a da morfina subaracnóidea em pacientes submetidos a cirurgias ortopédicas em membro inferior (MI). MÉTODO: Foram estudados 40 pacientes escalados para cirurgia ortopédica de MI, de ambos os sexos, estado físico ASA I e II, com idades entre 15 e 7...

  3. Cetamina e analgesia preemptiva Cetamina y analgesia preemptiva Ketamine and preemptive analgesia

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    Caio Márcio Barros de Oliveira

    2004-10-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: Desde a descoberta de que a cetamina bloqueia os receptores NMDA nos neurônios do corno dorsal da medula, ela tem sido usada para inibir ou reduzir a sensibilização central provocada por estímulos nociceptivos. Assim, este trabalho visa mostrar aspectos farmacológicos da cetamina racêmica e de seu composto levogiro e seu emprego na analgesia preemptiva. CONTEÚDO: São apresentados conceitos atuais sobre analgesia preemptiva, aspectos farmacológicos da cetamina e seu derivado levogiro, bem como estudos experimentais e clínicos sobre a cetamina e seu uso em analgesia preemptiva. CONCLUSÕES: Ainda não está totalmente comprovada a eficácia da cetamina em inibir ou reduzir a sensibilização central provocada por estímulos nociceptivos. Provavelmente isso se deva ao uso de diferentes métodos de estudo e de análise estatística.JUSTIFICATIVA Y OBJETIVOS: Desde la descubierta de que la cetamina bloquea los receptores NMDA en los neuronios del cuerno dorsal de la médula, ella ha sido usada para inhibir o reducir la sensibilización central provocada por estímulos nociceptivos. Así, este trabajo tiene por finalidad mostrar aspectos farmacológicos de la cetamina racemica y de su compuesto levogiro y su empleo en la analgesia preemptiva. CONTENIDO: Se presentan conceptos actuales sobre analgesia preemptiva, aspectos farmacológicos de la cetamina y su derivado levogiro, bien como estudios experimentales y clínicos sobre la cetamina y su uso en analgesia preemptiva. CONCLUSIONES: Aun no está totalmente comprobada la eficacia de la cetamina en inhibir o reducir la sensibilización central provocada por estímulos nociceptivos. Probablemente eso se deba al uso de diferentes métodos de estudio y de análisis estadística.BACKAGROUND AND OBJECTIVES: Since the finding that ketamine blocks NMDA receptors in the neurons of spinal dorsal horn, it has been used to inhibit or decrease central sensitization triggered

  4. Paracetamol e dipirona por via endovenosa aplicados à analgesia pós-operatória de pacientes pediátricos submetidos à amigdelectomia em hospital-dia: um estudo prospectivo, randomizado, duplo-cego, placebo controlado Intravenous paracetamol and dipyrone for postoperative analgesia after day-case tonsillectomy in children: a prospective, randomized, double blind, placebo controlled study

    Directory of Open Access Journals (Sweden)

    Aysu Inan Kocum

    2013-02-01

    Full Text Available O manejo da dor pós-amigdelectomia pode ser feito com uma série de medicamentos. OBJETIVO: O presente estudo duplo-cego placebo controlado pretendeu avaliar a eficácia de paracetamol e dipirona administrados por via endovenosa na analgesia de pacientes pediátricos pós-amigdelectomia. MÉTODO: Cento e vinte crianças com idades entre três e seis anos submetidas à amigdelectomia com ou sem adenoidectomia e/ou entubação foram randomizadas para receber infusões de paracetamol (15 mg/kg, dipirona (15 mg/kg ou placebo (0,9% NaCl durante a cirurgia. As avaliações foram executadas com 0,25, 0,50, 1, 2, 4, 6h de pós-operatório. Petidina 0,25 mg/kg foi utilizada como analgésico de resgate. Dose acumulada de petidina foi o desfecho primário. Medições de intensidade da dor, alívio da dor, nível de sedação, náusea e vômitos, hemorragia no pós-operatório e outros efeitos adversos foram anotados. RESULTADOS: Nenhuma diferença significativa foi encontrada na dose acumulada de petidina entre os grupos paracetamol e dipirona. A dose acumulada de petidina foi significativamente menor nos grupos paracetamol e dipirona em comparação ao grupo placebo. Nenhuma diferença significativa foi observada entre os escores de dor no pós-operatório dos grupos durante o estudo. CONCLUSÃO: Paracetamol endovenoso tem eficácia analgésica semelhante à da dipirona endovenosa; ambos ajudam a reduzir a necessidade de opioides na analgesia pós-operatória de pacientes pediátricos submetidos à amigdelectomia em hospital-dia.Tonsillectomy is associated with severe postoperative pain for which, several drugs are employed for management. OBJECTIVE: In this double-blind, placebo-controlled study we aimed to evaluate the efficacy of intravenous paracetamol and dipyrone when used for post-tonsillectomy analgesia in children. METHOD: 120 children aged 3-6 yr, undergoing tonsillectomy with or without adenoidectomy and/or ventilation tube insertion were

  5. A Safety Argument Strategy for PCA Closed-Loop Systems: A Preliminary Proposal

    OpenAIRE

    Feng, Lu; King, Andrew L.; Chen, Sanjian; Ayoub, Anaheed; Park, Junkil; Bezzo, Nicola; Sokolsky, Oleg; Lee, Insup

    2014-01-01

    The emerging network-enabled medical devices impose new challenges for the safety assurance of medical cyber-physical systems (MCPS). In this paper, we present a case study of building a high-level safety argument for a patient-controlled analgesia (PCA) closed-loop system, with the purpose of exploring potential methodologies for assuring the safety of MCPS.

  6. Efeito preemptivo da morfina por via venosa na analgesia pós-operatória e na resposta ao trauma cirúrgico Efecto preemptivo de la morfina por vía venosa en la analgesia pós-operatoria y en la respuesta al trauma quirúrgico The effect of preemptive intravenous morphine on postoperative analgesia and surgical stress response

    OpenAIRE

    Levent Kiliçkan

    2001-01-01

    JUSTIFICATIVA E OBJETIVOS: Embora os primeiros estudos sobre analgesia preemptiva tenham demonstrado que o bloqueio pré-operatório com anestésicos locais ou a medicação pré-anestésica com opióides sistêmicos eram mais eficazes no alívio da dor pós-operatória do que qualquer outro tratamento, o resultado de outros estudos comparando os efeitos do tratamento pré operatório ao mesmo tratamento iniciado após a cirurgia, produziram efeitos inconsistentes. As razões para essa falta de consistência ...

  7. Usefulness of modified intravenous analgesia: initial experience in uterine artery embolization for leiomyomata

    Energy Technology Data Exchange (ETDEWEB)

    Yang, Seung Boo; Jung, Young Jin [Soonchunhyang University, Gumi Hospital, Gumi (Korea, Republic of); Goo, Dong Erk; Jang, Yun Woo [Soonchunhyang University Hospital, Seoul (Korea, Republic of)

    2006-04-15

    We wanted to evaluate the usefulness of modified intravenous analgesia for the management of pain during uterine artery embolization for leiomyomata. Between April 2004 and July 2004, 15 patients with symptomatic fibroids underwent uterine artery embolization and pain management. Except the three patients for whom the Visual Analogue Scale (VAS) score was not obtained, twelve patients were included in this study. For pain management, epidural PCA (Patient Controlled Analgesia) was used in two patients, intravenous PCA was used in two patients and modified intravenous analgesia injection was used in eight patients. For all the patients, we used the 2.8 Fr coaxial microcatheter and 500-710 {mu} m PVA particles for the embolic materials. The protocol of the modified intravenous analgesia injection was as follow, 1) prior to femoral artery puncture, 30 mg of ketorolac tromethamine (Tarasyn)was injected via an intravenous route. 2) At the time that the one side uterine artery embolization was finished, normal saline mixed 150 mg meperidine (Demerol) was administered through the side port of the intravenous line that was used for hydration. 3) Additional ketorolac tromethamine 30 mg was injected after 6 hour. The VAS score and side effects were then checked. After 12 hours, the VAS score was rechecked. If the VAS score was above 4, this was considered as failure of pain management. The VAS scores, complications and side effects for the modified intravenous analgesia injection were compared with that of IV PCA and epidural PCA. The average VAS score of the modified intravenous analgesia injection, intravenous PCA and epidural PCA was 1.4, 1 and 0, respectively; the number of additional intramuscular injections of analgesia was 0.5, 0.5 and 0, respectively. All the patients who underwent epidural PCA had back pain at the puncture site and 1 patient who underwent modified intravenous analgesia injection experienced mild dyspnea, but they easily recovered with such

  8. Usefulness of modified intravenous analgesia: initial experience in uterine artery embolization for leiomyomata

    International Nuclear Information System (INIS)

    We wanted to evaluate the usefulness of modified intravenous analgesia for the management of pain during uterine artery embolization for leiomyomata. Between April 2004 and July 2004, 15 patients with symptomatic fibroids underwent uterine artery embolization and pain management. Except the three patients for whom the Visual Analogue Scale (VAS) score was not obtained, twelve patients were included in this study. For pain management, epidural PCA (Patient Controlled Analgesia) was used in two patients, intravenous PCA was used in two patients and modified intravenous analgesia injection was used in eight patients. For all the patients, we used the 2.8 Fr coaxial microcatheter and 500-710 μ m PVA particles for the embolic materials. The protocol of the modified intravenous analgesia injection was as follow, 1) prior to femoral artery puncture, 30 mg of ketorolac tromethamine (Tarasyn)was injected via an intravenous route. 2) At the time that the one side uterine artery embolization was finished, normal saline mixed 150 mg meperidine (Demerol) was administered through the side port of the intravenous line that was used for hydration. 3) Additional ketorolac tromethamine 30 mg was injected after 6 hour. The VAS score and side effects were then checked. After 12 hours, the VAS score was rechecked. If the VAS score was above 4, this was considered as failure of pain management. The VAS scores, complications and side effects for the modified intravenous analgesia injection were compared with that of IV PCA and epidural PCA. The average VAS score of the modified intravenous analgesia injection, intravenous PCA and epidural PCA was 1.4, 1 and 0, respectively; the number of additional intramuscular injections of analgesia was 0.5, 0.5 and 0, respectively. All the patients who underwent epidural PCA had back pain at the puncture site and 1 patient who underwent modified intravenous analgesia injection experienced mild dyspnea, but they easily recovered with such

  9. Speeding up PCA in R

    DEFF Research Database (Denmark)

    Kucheryavskiy, Sergey V.

    Principal component analysis (PCA) is a widespread method for multivariate data exploration. In many cases, PCA is the first tool an analyst uses to get a feeling of the data structure. Analysis of hyperspectral images is not an excep- tion here and many image analysis packages provide, among oth...

  10. The impact of patients controlled analgesia undergoing orthopedic surgery

    Directory of Open Access Journals (Sweden)

    Aluane Silva Dias

    2016-06-01

    Full Text Available ABSTRACT INTRODUCTION: The currently common musculoskeletal disorders have been increasingly treated surgically, and the pain can be a limiting factor in postoperative rehabilitation. RATIONALE: Patient controlled analgesia (PCA controls pain, but its adverse effects can interfere with rehabilitation and in the patient discharge process. This study becomes important, since there are few studies evaluating this correlation. OBJECTIVES: To compare the outcomes of patients who used and did not use patient controlled analgesia in postoperative orthopedic surgery with respect to pain, unscheduled need for O2 (oxygen, and time of immobility and in-hospital length of stay. METHODS: This is an observational, prospective study conducted at Hospital Abreu Sodré from May to August 2012. The data was daily obtained through assessments and interviews of patients undergoing total hip arthroplasty (THA and total knee arthroplasty (TKA, thoracolumbar spine arthrodesis (long PVA, cervical spine arthrodesis (cervical AVA and lumbar spine arthrodesis (lumbar PVA. RESULTS: The study showed some differences between groups, namely: the painful level was higher in the group undergoing lumbar PVA without PCA compared with the group with PCA (p = 0.03 and in the group of long PVA without PCA in the early postoperative period. This latter group used O2 for a longer time (p = 0.09. CONCLUSION: In this study, PCA was useful for analgesia in patients undergoing lumbar PVA and probably would have influenced the usage time of O2 in the group of long PVA in face of a larger sample. The use of PCA did not influence the time of leaving the bed and the in-hospital length of stay for the patients studied.

  11. A Comparative Efficacy of Propacetamol and Ketorolac in Postoperative Patient Controlled Analgesia

    OpenAIRE

    Heo, Bong Ha; Park, Ji Hun; Choi, Jung Il; Kim, Woong Mo; Lee, Hyoung gon; Cho, Soo Young; Yoon, Myoung Ha

    2015-01-01

    Background Ketorolac has been used as a postoperative analgesia in combination with opioids. However, the use of ketorolac may produce serious side effects in vulnerable patients. Propacetamol is known to induce fewer side effects than ketorolac because it mainly affects the central nervous system. We compared the analgesic effects and patient satisfaction levels of each drug when combined with fentanyl patient-controlled analgesia (PCA). Methods The patients were divided into two groups, eac...

  12. Analgesia adjuvante e alternativa Analgesia adyuvante y alternativa Adjuvant and alternative analgesia

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    Nilton Bezerra do Vale

    2006-10-01

    álgicos actúan a través de la vía espinal de control de la compuerta de Melzack y Wall y/o a través de la transducción de la señal en los sistemas de neurotransmisión y neuromodulación central relacionados con la analgesia, relajamiento y el humor: peptidérgico, monaminérgico, gabaérgico, colinérgico y canabinoide. La Analgesia Adyuvante Complementaria es habitualmente utilizada en los tratamientos fisiátricos, ortopédicos, reumatológicos, obstétricos y con acupuntura. La Analgesia Alternativa Complementaria puede potenciar los métodos analgésicos convencionales, la exposición al del sol del alba, luz y colores bajo la luz artificial, el tiempo (T - anestésicos generales más potentes por la noche, opioides por la mañana y anestésicos locales a la tarde, dieta, buen humor y la risa, espiritualidad, religión, meditación, musicoterapia, hipnosis y efecto placebo. CONCLUSIONES: Si el dolor agudo es un mecanismo de defensa, el dolor crónico es un estado patológico desagradable relacionado con la depresión endógena y con una baja calidad de vida. Es importante establecer relaciones interdisciplinarias entre la Medicina adyuvante y alternativa en las terapias analgésicas y antiinflamatorias clásicas.BACKGROUND AND OBJECTIVES: Although acute and chronic pain are usually controlled with pharmacological interventions, 14 complementary methods of adjuvant and alternative analgesia (AAA may reduce the abusive prescription of analgesics and the side effects that eventually compromise the patient's physiological status. CONTENTS: The action of every analgesic mechanism is through the spinal gate of Melzack and Wall and/or through signal transduction in the central neurotransmission and neuromodulation systems related to analgesia, relaxation, and mood: peptidergic, monoaminergic, gabaergic, cholinergic, and cannabinoid. Complementary adjuvant analgesia is normally used in physiatric, orthopedic, rheumatologic, and obstetric treatments and acupuncture. It can

  13. Bloqueio do plexo lombar pela via posterior para analgesia pós-operatória em artroplastia total do quadril: estudo comparativo entre Bupivacaína a 0,5% com Epinefrina e Ropivacaína a 0,5% Bloqueo del plexo lumbar por la vía posterior para analgesia postoperatoria en artroplastia total de la cadera: estudio comparativo entre Bupivacaína a 0,5% con Epinefrina y Ropivacaína a 0,5% Posterior lumbar plexus block in postoperative analgesia for total hip arthroplasty: a comparative study between 0.5% Bupivacaine with Epinephrine and 0.5% Ropivacaine

    Directory of Open Access Journals (Sweden)

    Leonardo Teixeira Domingues Duarte

    2009-06-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: O bloqueio do plexo lombar pela via posterior promove analgesia pós-operatória efetiva na artroplastia total do quadril. Ropivacaína e bupivacaína não apresentaram qualquer diferença na eficácia analgésica em diferentes bloqueios de nervos periféricos. O objetivo deste estudo foi comparar a eficácia da analgesia pós-operatória resultante da administração em dose única da bupivacaína a 0,5% ou da ropivacaína a 0,5% no bloqueio do plexo lombar pela via posterior na artroplastia total do quadril. MÉTODO: Trinta e sete pacientes foram alocados aleatoriamente em dois grupos, segundo o anestésico local utilizado no bloqueio: Grupo B - bupivacaína a 0,5% com epinefrina 1:200.000 ou Grupo R - ropivacaína a 0,5%. Durante o período pós-operatório, os escores de dor e o consumo de morfina na analgesia controlada pelo paciente foram comparados entre os grupos. O sangramento durante a operação e a incidência de efeitos adversos e de complicações também foram comparados. RESULTADOS: Apesar dos escores de dor terem sido menores no Grupo R 8, 12 e 24 horas após o bloqueio, essas diferenças não foram clinicamente significativas. Regressão linear múltipla não identificou o anestésico local como variável independente. Não houve diferença no consumo de morfina, no sangramento intraoperatório e na incidência de complicações e efeitos adversos entre os dois grupos. CONCLUSÕES: A bupivacaína a 0,5% e a ropivacaína a 0,5% produziram alívio eficaz e prolongado da dor pós-operatória após artroplastia total do quadril, sem diferença clínica, quando doses equivalentes foram administradas no bloqueio do plexo lombar pela via posterior.JUSTIFICATIVA Y OBJETIVOS: El bloqueo del plexo lumbar por la vía posterior, genera una analgesia postoperatoria efectiva en la artroplastia total de la cadera. La ropivacaína y la bupivacaína no arrojaron ninguna diferencia en la eficacia analgésica en

  14. The impact of patients controlled analgesia undergoing orthopedic surgery

    OpenAIRE

    Aluane Silva Dias; Tathyana Rinaldi; Luciana Gardin Barbosa

    2016-01-01

    ABSTRACT INTRODUCTION: The currently common musculoskeletal disorders have been increasingly treated surgically, and the pain can be a limiting factor in postoperative rehabilitation. RATIONALE: Patient controlled analgesia (PCA) controls pain, but its adverse effects can interfere with rehabilitation and in the patient discharge process. This study becomes important, since there are few studies evaluating this correlation. OBJECTIVES: To compare the outcomes of patients who used and di...

  15. Pain relief and clinical outcome: from opioids to balanced analgesia

    DEFF Research Database (Denmark)

    Kehlet, H

    1996-01-01

    If it is generally accepted that adequate postoperative pain relief will improve outcome from surgery, several controlled trials demonstrated this only for lower body surgical procedures with epidural and spinal anesthetics. Important effects on outcome were not shown when postoperative opioids...... were administered with patient controlled (PCA) or epidural techniques. However, the most optimal pain relief seems to be best achieved with balanced analgesia techniques using combinations of epidural opioids and local anesthetics and systemic non-steroidal antiinflammatory drugs. Future efforts...

  16. Análise multivariada aplicada na identificação de fármacos antidepressivos. Parte II: Análise por componentes principais (PCA e o método de classificação SIMCA Multivariate analysis to applied in the identification of antidepressants. Part II: principal components analysis (PCA and soft independent modeling of class analogies (SIMCA

    Directory of Open Access Journals (Sweden)

    Janusa Goelzer Sabin

    2004-09-01

    Full Text Available Neste trabalho a identificação e a discriminação de dois diferentes fármacos utilizados como antidepressivos foi estudada, empregando os espectros de reflexão difusa no infravermelho médio com transformada de Fourier (DRIFTS, juntamente com a análise de componentes principais (PCA e o método de classificação SIMCA. Os espectros no infravermelho de amostras contendo diferentes concentrações dos princípios ativos cloridrato de amitriptilina e cloridrato de imipramina, foram coletados em um espectrofotômetro NICOLET Magna 550, sendo realizadas 2 réplicas para cada amostra, com resolução de 4 cm-1 e 32 varreduras. A análise de componentes principais confirmou a existência de dois grupos distintos, correspondendo aos dois diferentes princípios ativos utilizados, além de evidenciar a presença de amostras anômalas no conjunto de dados que, possivelmente, iriam interferir na modelagem. Já o método de classificação SIMCA possibilitou o reconhecimento de amostras dos princípios ativos cloridrato de imipramina e cloridrato de amitriptilina com resultados indicando 100% de classificação correta das classes modeladas.In this work the certification of two different drugs used as antidepressants was studied, using diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS, together with the analysis of principal components (PCA and the method of soft independent modeling of class analogies (SIMCA. The DRIFT spectra of samples with different concentrations of the active principles amitriptiline and imipramine hydrochlorides had been collected in Magna 550 spectrofotometer, two spectra for each sample, with resolution of 4 cm-1 and 32 scans. The PCA confirmed the existence of two distinct groups, corresponding to the two different active principles used. Otherwise the method of classification SIMCA made possible the recognition of samples of the principles amitriptyline and imipramine hydrochlorides with results indicating

  17. Lombociatalgia: comparação da analgesia entre metilprednisolona, fentanil e metilprednisolona com fentanil, associados à bupivacaína, por via peridural

    Directory of Open Access Journals (Sweden)

    Quitéria Maria Wanderley Rocha

    2001-10-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: Os corticosteróides têm sido empregados no espaço peridural, como alternativa de tratamento da lombalgia refratária às medidas conservadoras. Os opióides têm efeito analgésico através da ligação a receptores da medula espinhal e poderiam ter efeito somatório. Este estudo teve como objetivo avaliar a eficácia, os efeitos colaterais e as complicações de opióide e corticosteróide associados ao anestésico local, para tratamento da lombalgia e lombociatalgia aguda, provocadas por hérnia de disco. MÉTODO: Foram avaliados 45 pacientes adultos portadores de hérnia de disco. O grupo G-I recebeu 8 ml de bupivacaína a 0,25% com metilprednisolona (80 mg; o grupo G-II, 8 ml de bupivacaína a 0,25% com fentanil (100 µg e o grupo G-III, 6 ml de bupivacaína a 0,25% com fentanil (100 µg e metilprednisolona (80 mg. Havendo necessidade de repetição, nova injeção foi feita após 1 semana e 2 semanas no espaço intervertebral, ou próximo ao da localização da hérnia de disco. O efeito analgésico foi mensurado através de escala verbal. RESULTADOS: Aos 30 minutos, 6, 12 e 24 horas após o procedimento não houve diferença entre os grupos quanto ao alívio da dor. No quarto, sétimo e 14º dias, os grupos GI e GIII mostraram melhor alívio da dor, não havendo diferença estatística entre esses grupos. No grupo GII houve maior necessidade para repetir a injeção no 7º dia (GI= 33,3%; GII= 100% e GIII= 33,3%, e no 14º dia (GI= 6,6%; GII= 86,6% e GIII= 6,6%. A utilização de tramadol foi maior no GII. No GI, houve cefaléia (1 paciente; no GII, sonolência (2 pacientes e prurido (1 paciente e no GIII, prurido (1 paciente e sonolência (1 paciente. CONCLUSÕES: O citrato de fentanil não tem efeito duradouro no controle da dor da hérnia de disco e não melhora o efeito analgésico quando associado a bupivacaína e metilprednisolona por via peridural.

  18. Multiple levels paravertebral block versus morphine patient-controlled analgesia for postoperative analgesia following breast cancer surgery with unilateral lumpectomy, and axillary lymph nodes dissection

    Science.gov (United States)

    Fallatah, Summayah; Mousa, WF

    2016-01-01

    Background: Postoperative pain after breast cancer surgery is not uncommon. Narcotic based analgesia is commonly used for postoperative pain management. However, the side-effects and complications of systemic narcotics is a significant disadvantage. Different locoregional anesthetic techniques have been tried including, single and multiple levels paravertebral block (PVB), which seems to have a significant reduction in immediate postoperative pain with fewer side-effects. The aim of this study was to compare unilateral multiple level PVB versus morphine patient-controlled analgesia (PCA) for pain relief after breast cancer surgery with unilateral lumpectomy and axillary lymph nodes dissection. Materials and Methods: Forty patients scheduled for breast cancer surgery were randomized to receive either preoperative unilateral multiple injections PVB at five thoracic dermatomes (group P, 20 patients) or postoperative intravenous PCA with morphine (group M, 20 patients) for postoperative pain control. Numerical pain scale, mean arterial pressure, heart rate, Time to first analgesic demand, 24-h morphine consumption side-effects and length of hospital stay were recorded. Results: PVB resulted in a significantly more postoperative analgesia, maintained hemodynamic, more significant reduction in nausea and vomiting, and shorter hospital stay compared with PCA patients. Conclusion: Multiple levels PVB is an effective regional anesthetic technique for postoperative pain management, it provides superior analgesia with less narcotics consumption, and fewer side-effects compared with PCA morphine for patients with breast cancer who undergo unilateral lumpectomy, with axillary lymph nodes dissection. PMID:26955304

  19. Multiple levels paravertebral block versus morphine patient-controlled analgesia for postoperative analgesia following breast cancer surgery with unilateral lumpectomy, and axillary lymph nodes dissection

    Directory of Open Access Journals (Sweden)

    Summayah Fallatah

    2016-01-01

    Full Text Available Background: Postoperative pain after breast cancer surgery is not uncommon. Narcotic based analgesia is commonly used for postoperative pain management. However, the side-effects and complications of systemic narcotics is a significant disadvantage. Different locoregional anesthetic techniques have been tried including, single and multiple levels paravertebral block (PVB, which seems to have a significant reduction in immediate postoperative pain with fewer side-effects. The aim of this study was to compare unilateral multiple level PVB versus morphine patient-controlled analgesia (PCA for pain relief after breast cancer surgery with unilateral lumpectomy and axillary lymph nodes dissection. Materials and Methods: Forty patients scheduled for breast cancer surgery were randomized to receive either preoperative unilateral multiple injections PVB at five thoracic dermatomes (group P, 20 patients or postoperative intravenous PCA with morphine (group M, 20 patients for postoperative pain control. Numerical pain scale, mean arterial pressure, heart rate, Time to first analgesic demand, 24-h morphine consumption side-effects and length of hospital stay were recorded. Results: PVB resulted in a significantly more postoperative analgesia, maintained hemodynamic, more significant reduction in nausea and vomiting, and shorter hospital stay compared with PCA patients. Conclusion: Multiple levels PVB is an effective regional anesthetic technique for postoperative pain management, it provides superior analgesia with less narcotics consumption, and fewer side-effects compared with PCA morphine for patients with breast cancer who undergo unilateral lumpectomy, with axillary lymph nodes dissection.

  20. Classification of the gasoline sample related to the adulteration with solvent based in a Principal Component Analysis (PCA) using FT-IR spectrometry; Classificacao de amostra de gasolina em relacao a adulteracao por solvente baseada na Analise de Componente Principal (PCA) usando espectrometria FT-IR

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Hilda Costa dos; Teixeira, Leonardo Sena Gomes [Universidade Salvador (UNIFACS), Salvador, BA (Brazil). Dept. de Engenharia e Arquitetura]. E-mail: hildac69@hotmail.com

    2003-07-01

    A descriptive and exploratory method to identify adulteration with solvent in samples of gasoline based on the principal component analysis (PCA) using FT-IR spectroscopy was developed. Oil diesel, kerosene, turpentine spirit and thinner were the solvents tested. The samples were added different amounts of solvent to the sample of gasoline type 'A' in way to maintain the alcohol concentration in 25%. After obtaining of the spectrum of infrared was made analysis of principal component using the program MATLAB. The results showed that it was possible to cluster samples of gasoline in different groups in agreement with the used solvent. Besides, samples previously analyzed at Universidade Salvador's laboratory, obeying conform criteria and no conform with the brazilian specifications, they were analyzed and classified as the presence or not of solvent, besides to inform which the solvent type used in the adulteration. (author)

  1. Acupoint stimulation to improve analgesia quality for lumbar spine surgical patients.

    Science.gov (United States)

    Chung, Yu-Chu; Chien, Hui-Ching; Chen, Hsing-Hsia; Yeh, Mei-Ling

    2014-12-01

    Lumbar spine surgery has a high incidence of postoperative pain, but this pain is treatable through many methods, including patient-controlled analgesia (PCA). Acupoint stimulation could be considered an adjunct to PCA, improving the effectiveness of analgesia for patients recovering from lumbar spine surgery. The current study aimed to examine the effect of acupoint stimulation with PCA on improving analgesia quality after lumbar spine surgery. A single-blinded, sham-controlled design was used for the experimental, not control, groups. Data collection for the control group was completed first, followed by data collection for the other 2 groups. Participants were randomly assigned to the acupoint stimulation (AS) (n = 45) or sham group (n = 45). All participants received structural PCA multimedia information before lumbar surgery. The AS group received auricular acupressure combined with transcutaneuos electric acupoint stimulation (TEAS) at the true acupoint; the sham group received acupoint stimulation in the same manner but at a sham acupoint and without embedding seeds; and the control group received no acupoint stimulations. The analgesia quality, analgesic consumption, and postoperative nausea and vomiting (PONV) were used as measure of effects for the interventions. Significant differences were found between the AS and control groups in pain intensity but not in the belief and satisfaction subscales of analgesia quality. Also found a significant difference among the 3 groups in analgesic consumption and the severity of PONV in the first 72 hours after surgery. The current study shows that the combination of auricular acupressure and TEAS reduced pain intensity, morphine consumption, and PONV severity. Acupoint stimulation could be considered a multimodal analgesia method and an adjunct to PCA for lumbar spine surgery patients. PMID:24144572

  2. Patient-controlled analgesia: an appropriate method of pain control in children.

    Science.gov (United States)

    McDonald, A J; Cooper, M G

    2001-01-01

    Patient-controlled analgesia (PCA) is an analgesic technique originally used in adults but now with an established role in paediatric practice. It is well tolerated in children as young as 5 years and has uses in postoperative pain as well as burns, oncology and palliative care. The use of background infusions is more frequent in children and improves efficacy; however, it may increase the occurrence of adverse effects such as nausea and respiratory depression. Monitoring involves measurement of respiratory rate, level of sedation and oxygen saturation. Efficacy is assessed by self-reporting, visual analogue scales, faces pain scales and usage patterns. This is optimally performed both at rest and on movement. The selection of opioid used in PCA is perhaps less critical than the appropriate selection of parameters such as bolus dose, lockout and background infusion rate. Moreover, opioid choice may be based on adverse effect profile rather than efficacy. The concept of PCA continues to be developed in children, with patient-controlled epidural analgesia, subcutaneous PCA and intranasal PCA being recent extensions of the method. There may also be a role for patient-controlled sedation. PCA, when used with adequate monitoring, is a well tolerated technique with high patient and staff acceptance. It can now be regarded as a standard for the delivery of postoperative analgesia in children aged >5 years. PMID:11354699

  3. Incremental PCA-LDA Algorithm

    Directory of Open Access Journals (Sweden)

    Issam Dagher

    2010-06-01

    Full Text Available In this paper a recursive algorithm of calculating the discriminant features of thePCA-LDA procedure is introduced. This algorithm computes the principalcomponents of a sequence of vectors incrementally without estimating thecovariance matrix (so covariance-free and at the same time computing the lineardiscriminant directions along which the classes are well separated. Two majortechniques are used sequentially in a real time fashion in order to obtain the mostefficient and linearly discriminative components. This procedure is done bymerging the runs of two algorithms based on principal component analysis (PCAand linear discriminant analysis (LDA running sequentially. This algorithm isapplied to face recognition problem. Simulation results on different databasesshowed high average success rate of this algorithm compared to PCA and LDAalgorithms. The advantage of the incremental property of this algorithmcompared to the batch PCA-LDA is also shown.

  4. PCaPAC 2006 Proceedings

    Energy Technology Data Exchange (ETDEWEB)

    Pavel Chevtsov; Matthew Bickley (Eds.)

    2007-03-30

    The 6-th international PCaPAC (Personal Computers and Particle Accelerator Controls) workshop was held at Jefferson Lab, Newport News, Virginia, from October 24-27, 2006. The main objectives of the conference were to discuss the most important issues of the use of PCs and modern IT technologies for controls of accelerators and to give scientists, engineers, and technicians a forum to exchange the ideas on control problems and their solutions. The workshop consisted of plenary sessions and poster sessions. No parallel sessions were held.Totally, more than seventy oral and poster presentations as well as tutorials were made during the conference, on the basis of which about fifty papers were submitted by the authors and included in this publication. This printed version of the PCaPAC 2006 Proceedings is published at Jefferson Lab according to the decision of the PCaPAC International Program Committee of October 26, 2006.

  5. Advances in patient-controlled analgesia: the role of fentanyl ITS

    Directory of Open Access Journals (Sweden)

    Ian Power

    2009-01-01

    Full Text Available Ian Power, Jon G McCormackDepartment of Anaesthesia, Critical Care and Pain Medicine, The University of Edinburgh, Royal Infirmary, Edinburgh, UKAbstract: Effective pain relief is an essential component of a patient’s peri-operative care package. Good analgesia has been shown to reduce the incidence of cardiovascular, respiratory and thrombo-embolic complications following surgery. Satisfactory analgesia facilitates early patient ambulation following surgery, which may reduce in-patient stay. Patient-controlled analgesia (PCA systems are a well established standard therapy for acute post-operative pain; however some practical limitations limit their clinical utility. The fentanyl inotophoretic transdermal system (ITS is a novel self-contained needle-free PCA device, which delivers boluses of fentanyl transdermally. This system has been shown to provide analgesia equivalent to conventional PCA modalities, with unique design features that may confer advantages to patients and staff, including facilitating patient mobilization in the post-operative phase. This review will discuss the technology of iontophoretic systems, the pharmacology of transdermal fentanyl delivery, and some practical implications of the fentanyl ITS.Keywords: iontophoresis, transdermal, patient-controlled analgesia, fentanyl, post-operative pain

  6. Ethanol-induced analgesia

    Energy Technology Data Exchange (ETDEWEB)

    Pohorecky, L.A.; Shah, P.

    1987-09-07

    The effect of ethanol (ET) on nociceptive sensitivity was evaluated using a new tail deflection response (TDR) method. The IP injection of ET (0.5 - 1.5 g/kg) produced raid dose-dependent analgesia. Near maximal effect (97% decrease in TDR) was produced with the 1.5 g/kg dose of ET ten minutes after injection. At ninety minutes post-injection there was still significant analgesia. Depression of ET-induced nociceptive sensitivity was partially reversed by a 1 mg/kg dose of naloxone. On the other hand, morphine (0.5 or 5.0 mg/kg IP) did not modify ET-induced analgesia, while 3.0 minutes of cold water swim (known to produce non-opioid mediated analgesia) potentiated ET-induced analgesic effect. The 0.5 g/kg dose of ET by itself did not depress motor activity in an open field test, but prevented partially the depression in motor activity produced by cold water swim (CWS). Thus, the potentiation by ET of the depression of the TDR produced by CWS cannot be ascribed to the depressant effects of ET on motor activity. 21 references, 4 figures, 1 table.

  7. Adding ketamine to morphine for intravenous patient-controlled analgesia for acute postoperative pain

    DEFF Research Database (Denmark)

    Carstensen, M.; Møller, Ann

    2010-01-01

    In experimental trials, ketamine has been shown to reduce hyperalgesia, prevent opioid tolerance, and lower morphine consumption. Clinical trials have found contradictory results. We performed a review of randomized, double-blinded clinical trials of ketamine added to opioid in i.v. patient......-controlled analgesia (PCA) for postoperative pain in order to clarify this controversy. Our primary aim was to compare the effectiveness and safety of postoperative administered ketamine in addition to opioid for i.v. PCA compared with i.v. PCA with opioid alone. Studies were identified from the Cochrane Library 2003...... of 4.5. Pain was assessed using visual analogue scales or verbal rating scales. Six studies showed significant improved postoperative analgesia with the addition of ketamine to opioids. Five studies showed no significant clinical improvement. For thoracic surgery, the addition of ketamine to opioid...

  8. Minilaparotomy under acupuncture analgesia.

    OpenAIRE

    Dias, P L; Subramanium, S

    1984-01-01

    Minilaparotomy was performed using acupuncture analgesia on 78 female patients seeking voluntary sterilization to determine whether this could be used as a substitute for standard analgesic sedation. In 48 women (62%) no intravenous drug medication was required, and sterilization was successfully performed using only the local anaesthetic and acupuncture electrostimulation. These patients could be discharged within one hour of operation. For a developing country with a shortage of trained ana...

  9. Optimizing Face Recognition Using PCA

    Directory of Open Access Journals (Sweden)

    Manal Abdullah

    2012-04-01

    Full Text Available Principle Component Analysis PCA is a classical feature extraction and data representation technique widely used in pattern recognition. It is one of the most successful techniques in face recognition. But it has drawback of high computational especially for big size database. This paper conducts a study to optimize the time complexity of PCA (eigenfaces that does not affects the recognition performance. The authorsminimize the participated eigenvectors which consequently decreases the computational time. A comparison is done to compare the differences between the recognition time in the original algorithm and in the enhanced algorithm. The performance of the original and the enhanced proposed algorithm is tested on face94 face database. Experimental results show that the recognition time is reduced by 35% by applying our proposed enhanced algorithm. DET Curves are used to illustrate the experimental results.

  10. Robust PCA via Outlier Pursuit

    CERN Document Server

    Xu, Huan; Sanghavi, Sujay

    2010-01-01

    Singular Value Decomposition (and Principal Component Analysis) is one of the most widely used techniques for dimensionality reduction: successful and efficiently computable, it is nevertheless plagued by a well-known, well-documented sensitivity to outliers. Recent work has considered the setting where each point has a few arbitrarily corrupted components. Yet, in applications of SVD or PCA such as robust collaborative filtering or bioinformatics, malicious agents, defective genes, or simply corrupted or contaminated experiments may effectively yield entire points that are completely corrupted. We present an efficient convex optimization-based algorithm we call Outlier Pursuit, that under some mild assumptions on the uncorrupted points (satisfied, e.g., by the standard generative assumption in PCA problems) recovers the exact optimal low-dimensional subspace, and identifies the corrupted points. Such identification of corrupted points that do not conform to the low-dimensional approximation, is of paramount ...

  11. Epidural analgesia during labor vs no analgesia: A comparative study

    Directory of Open Access Journals (Sweden)

    Wesam Farid Mousa

    2012-01-01

    Full Text Available Background: Epidural analgesia is claimed to result in prolonged labor. Previous studies have assessed epidural analgesia vs systemic opioids rather than to parturients receiving no analgesia. This study aimed to evaluate the effect of epidural analgesia on labor duration compared with parturients devoid of analgesia. Methods: One hundred sixty nulliparous women in spontaneous labor at full term with a singleton vertex presentation were assigned to the study. Parturients who request epidural analgesia were allocated in the epidural group, whereas those not enthusiastic to labor analgesia were allocated in the control group. Epidural analgesia was provided with 20 mL bolus 0.5% epidural lidocaine plus fentanyl and maintained at 10 mL for 1 h. Duration of the first and second stages of labor, number of parturients receiving oxytocin, maximal oxytocin dose required for each parturient, numbers of instrumental vaginal, vacuum-assisted, and cesarean deliveries and neonatal Apgar score were recorded. Results: There was no statistical difference in the duration of the active-first and the second stages of labor, instrumental delivery, vacuum-assisted or cesarean delivery rates, the number of newborns with 1-min and 5-min Apgar scores less than 7 between both groups and number of parturients receiving oxytocin, however, the maximal oxytocin dose was significantly higher in the epidural group. Conclusion: Epidural analgesia by lidocaine (0.5% and fentanyl does not prolong labor compared with parturients without analgesia; however, significant oxytocin augmentation is required during the epidural analgesia to keep up the aforementioned average labor duration.

  12. Analgesia postoperatoria con tramadol epidural tras histerectomía abdominal Epidural postoperative analgesia with tramadol after abdominal hysterectomy

    Directory of Open Access Journals (Sweden)

    E. González-Pérez

    2006-08-01

    Full Text Available Introducción: El dolor postoperatorio es un tipo especial de dolor agudo cuyo control inadecuado conduce a reacciones fisiopatológicas anormales. Objetivos: Evaluar la utilidad del tramadol por vía epidural en la analgesia postoperatoria de las pacientes a quienes se les practicó histerectomía abdominal. Material y método: Se estudiaron 90 pacientes que conformaron tres grupos: Grupo I: recibió 100 mg de tramadol epidural cada 6 h. Grupo II: recibió 1,2 g de metamizol por vía intramuscular cada 6 h. Grupo III: recibió 100 mg de tramadol por vía intramuscular cada 6 h. Se evaluó el comportamiento de la presión arterial media y la frecuencia cardíaca. Evaluamos la intensidad del dolor por medio de una Escala Visual Analógica. Fue utilizado metamizol sódico, 2 g endovenoso, como analgesia de rescate. Resultados: Se presentaron variaciones significativas de la frecuencia cardíaca y presión arterial media en el grupo I (P0,05, por lo que sólo 2 pacientes requirieron analgesia de rescate, mientras que el grupo II mostró las mayores variaciones (PIntroduction: Postoperative pain is a special type of acute pain whose inadequate control leads to abnormal reactions. Objectives: To evaluate the utility of tramadol by the epidural route in the postoperative analgesia of patients undergoing abdominal hysterectomy. Material and method: 90 patients studied who conformed three groups: Group I: received 100 mg of epidural tramadol every 6 h. Group II: received 1.2 g of intramuscular metamizol every 6 h. Group III: received 100 mg of intramuscular tramadol every 6 h. Blood pressure and heart rate were measured. Pain intensity was evaluated by a visual analogical scale. Metamizol 2 g was used as rescue analgesia. Results: Significant variations of heart rate and mean blood pressure were found in group I (p < 0.05 whereas in group II and III they were very significant (p < 0.01. The intensity of postoperative pain reached lower values in group I

  13. Analgesia adjuvante e alternativa

    OpenAIRE

    Vale Nilton Bezerra do

    2006-01-01

    JUSTIFICATIVA E OBJETIVOS: Embora a dor aguda e a crônica sejam habitualmente controladas com intervenções farmacológicas, 14 métodos complementares de analgesia adjuvante e alternativa (AAA) podem reduzir o uso e abuso na prescrição de analgésicos e diminuir os efeitos colaterais que eventualmente comprometem o estado fisiológico do paciente. CONTEÚDO: Todos os mecanismos antiálgicos atuam através da via espinal de controle da comporta de Melzack e Wall e/ou através da transdução do sinal no...

  14. Analgesia pós-operatória Postoperative analgesia

    Directory of Open Access Journals (Sweden)

    Betina Sílvia Beozzo Bassanezi

    2006-04-01

    Full Text Available JUSTIFICATIVAS E OBJETIVOS: A dor sempre foi uma das maiores preocupações do homem, entretanto, apesar dos progressos da ciência, ainda existem várias barreiras ao seu adequado tratamento, incluindo a falta de conhecimento por parte da equipe médica, sobre o mecanismo das diversas drogas e técnicas empregadas. O objetivo deste trabalho é abordar as principais drogas e técnicas empregadas no controle da dor pós-operatória, visando estimular o interesse sobre o assunto bem como aumentar a eficácia do tratamento dado aos pacientes. CONTEÚDO: Está ressaltada neste artigo, a importância da adequada analgesia pós-operatória, considerando as principais drogas e técnicas utilizadas no controle da dor, seus mecanismos de ação, posologias, vias de administração e efeitos colaterais, bem como a importância da integração de toda a equipe envolvida nos cuidados do paciente para o sucesso do tratamento. O tratamento inadequado da dor no pós-operatório não se justifica, pois há um arsenal considerável de drogas e técnicas analgésicas. O que se faz necessário, portanto, é que toda equipe, anestesistas, cirurgiões, e enfermeiros tenham conhecimento e estejam integrados na utilização deste arsenal.BACKGROUND AND OBJECTIVES: Pain has been one of the men's biggest worries. Despite of scientific progress there still exist many barriers in an adequate treatment of pain including the lack of knowledge of many drugs and pain management techniques. The objective of this study is to discuss the main drugs and analgesics process in an effort to stimulate our colleague interest about the subject and thus increasing treatment efficiency of our patients. CONTENTS: It is emphasized in this study the importance of an adequate postoperative analgesia discussing the main drugs and techniques used in pain management, their mechanism of action, dose, administration route and side effects of each drug. It is also pointed out the great importance

  15. International assessment of PCA codes

    International Nuclear Information System (INIS)

    Over the past three years (1991-1993), an extensive international exercise for intercomparison of a group of six Probabilistic Consequence Assessment (PCA) codes was undertaken. The exercise was jointly sponsored by the Commission of European Communities (CEC) and OECD Nuclear Energy Agency. This exercise was a logical continuation of a similar effort undertaken by OECD/NEA/CSNI in 1979-1981. The PCA codes are currently used by different countries for predicting radiological health and economic consequences of severe accidents at nuclear power plants (and certain types of non-reactor nuclear facilities) resulting in releases of radioactive materials into the atmosphere. The codes participating in the exercise were: ARANO (Finland), CONDOR (UK), COSYMA (CEC), LENA (Sweden), MACCS (USA), and OSCAAR (Japan). In parallel with this inter-code comparison effort, two separate groups performed a similar set of calculations using two of the participating codes, MACCS and COSYMA. Results of the intercode and inter-MACCS comparisons are presented in this paper. The MACCS group included four participants: GREECE: Institute of Nuclear Technology and Radiation Protection, NCSR Demokritos; ITALY: ENEL, ENEA/DISP, and ENEA/NUC-RIN; SPAIN: Universidad Politecnica de Madrid (UPM) and Consejo de Seguridad Nuclear; USA: Brookhaven National Laboratory, US NRC and DOE

  16. Bloqueio 3-em-1 prolongado versus analgesia sistêmica no tratamento da dor pós-operatória após a reconstrução do ligamento cruzado anterior do joelho Bloqueo 3 en 1 prolongado versus analgesia sistemica en el tratamiento del dolor postoperatorio después de la reconstrucción del ligamento cruzado anterior de la rodilla Extended three-in-one block versus intravenous analgesia for postoperative pain management after reconstruction of anterior cruciate ligament of the knee

    Directory of Open Access Journals (Sweden)

    Víctor A. Contreras-Domínguez

    2007-06-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: O bloqueio femoral contínuo (3-em-1 é usado para a analgesia pós-operatória de artroplastia de quadril e joelho com bons resultados, apresentando vantagens sobre outras técnicas de analgesia locorregional ou sistêmica e com baixa incidência de complicações. O objetivo deste estudo foi avaliar clinicamente a utilidade do bloqueio femoral contínuo em comparação com a analgesia por via venosa na reconstrução do ligamento cruzado anterior. MÉTODO: Foi realizado um estudo prospectivo, controlado, com 60 pacientes com estado físico ASA I. Os paciente foram divididos em dois grupos: Grupo 1 (n = 30: bloqueio femoral contínuo com infusão de bupivacaína e clonidina; Grupo 2 (n = 30: infusão por via venosa de cetoprofeno. A intervenção cirúrgica foi realizada sob raquianestesia e sedação. O tratamento da dor pós-operatória foi feito com analgesia controlada pelo paciente (PCA usando morfina. A dor pós-operatória foi registrada 2, 4, 6, 24 e 36 horas após a intervenção cirúrgica usando a Escala Visual Analógica (VAS. O consumo de morfina, a satisfação dos pacientes e as complicações também foram registradas. RESULTADOS: No Grupo 1, o VAS pós-operatório entre 4 e 48 horas após a intervenção cirúrgica foi de 21 mm ± 2 e no Grupo 2 foi de 45 mm ± 4 (p JUSTIFICATIVA Y OBJETIVOS: El bloqueo femoral continuo (tres-en-uno se usa para la analgesia postoperatoria de artroplastia de cadera y rodilla con buenos resultados, presentando ventajas sobre otras técnicas de analgesia loco regional o sistemica y con baja incidencia de complicaciones. El objetivo de este estudio fue el de evaluar clínicamente la utilidad del bloqueo femoral continuo en comparación con la analgesia intravenosa en la reconstrucción del ligamento cruzado anterior. MÉTODOS: Se realizó un estudio prospectivo controlado con 60 pacientes de estado físico ASA I. Los pacientes fueron divididos en dos grupos: Grupo 1 (n

  17. Remifentanil as analgesia for labour pain

    OpenAIRE

    Tveit, Tor Oddbjørn

    2013-01-01

    Aims: To collect updated information about pharmacological labour analgesia in Norway, especially systemic opioids and epidural. Evaluation of efficacy and safety with remifentanil IVPCA (intravenous patient-controlled analgesia) for pain relief during labour. To compare remifentanil IVPCAwith epidural analgesia (EDA) regarding efficacy and safety during labour. Methods: In paper I, two national surveys identified Norwegian labour analgesia methods and changes during the study ...

  18. EPIDURAL ANALGESIA IN LABOR - CONTROVERSIES.

    Science.gov (United States)

    Bilić, Nada; Djaković, Ivka; Kličan-Jaić, Katarina; Rudman, Senka Sabolović; Ivanec, Željko

    2015-09-01

    Labor pain is one of the most severe pains. Labor is a complex and individual process with varying maternal requesting analgesia. Labor analgesia must be safe and accompanied by minimal amount of unwanted consequences for both the mother and the child, as well as for the delivery procedure. Epidural analgesia is the treatment that best meets these demands. According to the American Congress of Obstetrics and Gynecology and American Society of Anesthesiologists, mother's demand is a reason enough for the introduction of epidural analgesia in labor, providing that no contraindications exist. The application of analgesics should not cease at the end of the second stage of labor, but it is recommended that lower concentration analgesics be then applied. Based on the latest studies, it can be claimed that epidural analgesia can be applied during the major part of the first and second stage of labor. According to previous investigations, there is no definitive conclusion about the incidence of instrumental delivery, duration of second stage of labor, time of epidural analgesia initiation, and long term outcomes for the newborn. Cooperation of obstetric and anesthesiology personnel, as well as appropriate technical equipment significantly decrease the need of instrumental completion of a delivery, as well as other complications encountered in the application of epidural analgesia. Our hospital offers 24/7 epidural analgesia service. The majority of pregnant women in our hospital were aware of the advantages of epidural analgesia for labor, however, only a small proportion of them used it, mainly because of inadequate level of information. PMID:26666104

  19. Confidence Areas for Fixed-Effects PCA

    OpenAIRE

    Josse, Julie; Wager, Stefan; Husson, François

    2014-01-01

    PCA is often used to visualize data when the rows and the columns are both of interest. In such a setting there is a lack of inferential methods on the PCA output. We study the asymptotic variance of a fixed-effects model for PCA, and propose several approaches to assessing the variability of PCA estimates: a method based on a parametric bootstrap, a new cell-wise jackknife, as well as a computationally cheaper approximation to the jackknife. We visualize the confidence regions by Procrustes ...

  20. Relative Information Loss in the PCA

    CERN Document Server

    Geiger, Bernhard C

    2012-01-01

    In this work we analyze principle component analysis (PCA) as a deterministic input-output system. We show that the relative information loss induced by reducing the dimensionality of the data after performing the PCA is the same as in dimensionality reduction without PCA. Finally, we analyze the case where the PCA uses the sample covariance matrix to compute the rotation. If the rotation matrix is not available at the output, we show that an infinite amount of information is lost. The relative information loss is shown to decrease with increasing sample size.

  1. Adrenalina como coadyuvante epidural para analgesia postoperatoria Epinephrine as epidural adjuvant for postoperative analgesia

    Directory of Open Access Journals (Sweden)

    B. Mugabure Bujedo

    2010-09-01

    Full Text Available La adrenalina ha sido ampliamente utilizada junto con anestésicos locales, tanto a nivel periférico como central, desde que Heinrich Braun fuera el pionero en experimentar con ella al inicio de 1900. Un siglo de uso atestigua su seguridad general como coadyuvante, a pesar de que todavía poseemos un conocimiento parcial de su modo de actuar, consiguiendo una prolongación del bloqueo nervioso, una reducción de las concentraciones plasmáticas de los anestésicos locales, una reducción del sangrado quirúrgico y una potenciación del efecto analgésico. El convencimiento durante largo tiempo de que la adrenalina muestra todos estos efectos beneficiosos, así como los negativos, únicamente por vasoconstricción, es demasiado simplista y actualmente insuficiente. El objetivo principal de esta revisión se centrará en demostrar como la adrenalina epidural es capaz de mejorar la analgesia postoperatoria cuando forma parte de una mezcla junto a bupivacaína o ropivacaína y fentanilo.Epinephrine has been combined with neuraxial and peripheral local anesthetics since Heinrich Braun first experimented with its use in the early 1900s. A century of use attests to the general safety of adjuvant epinephrine, yet we have only modest understanding of its intended effects, which include prolonging block duration, reducing plasma concentrations of local anesthetics, reducing surgical bleeding and intensifying anesthesia and analgesia. The long-held belief that epinephrine exerts most of these effects, including any associated complications, by causing vasoconstriction is doubtlessly too simplistic and has been recently challenged. The main part of this chapter will therefore focus on the advantages and disadvantages of epinephrine in epidural analgesia and on optimizing postoperative analgesia by adding epinephrine and/or fentanyl to an epidural mixture with dilute bupivacaine or ropivacaine.

  2. Adding ketamine to morphine for intravenous patient-controlled analgesia for acute postoperative pain: a qualitative review of randomized trials

    DEFF Research Database (Denmark)

    Carstensen, M; Møller, A M

    2010-01-01

    In experimental trials, ketamine has been shown to reduce hyperalgesia, prevent opioid tolerance, and lower morphine consumption. Clinical trials have found contradictory results. We performed a review of randomized, double-blinded clinical trials of ketamine added to opioid in i.v. patient......-controlled analgesia (PCA) for postoperative pain in order to clarify this controversy. Our primary aim was to compare the effectiveness and safety of postoperative administered ketamine in addition to opioid for i.v. PCA compared with i.v. PCA with opioid alone. Studies were identified from the Cochrane Library 2003...... of 4.5. Pain was assessed using visual analogue scales or verbal rating scales. Six studies showed significant improved postoperative analgesia with the addition of ketamine to opioids. Five studies showed no significant clinical improvement. For thoracic surgery, the addition of ketamine to opioid...

  3. Model selection for Gaussian kernel PCA denoising

    DEFF Research Database (Denmark)

    Jørgensen, Kasper Winther; Hansen, Lars Kai

    2012-01-01

    We propose kernel Parallel Analysis (kPA) for automatic kernel scale and model order selection in Gaussian kernel PCA. Parallel Analysis [1] is based on a permutation test for covariance and has previously been applied for model order selection in linear PCA, we here augment the procedure to also...

  4. PCA-based lung motion model

    CERN Document Server

    Li, Ruijiang; Jia, Xun; Zhao, Tianyu; Lamb, James; Yang, Deshan; Low, Daniel A; Jiang, Steve B

    2010-01-01

    Organ motion induced by respiration may cause clinically significant targeting errors and greatly degrade the effectiveness of conformal radiotherapy. It is therefore crucial to be able to model respiratory motion accurately. A recently proposed lung motion model based on principal component analysis (PCA) has been shown to be promising on a few patients. However, there is still a need to understand the underlying reason why it works. In this paper, we present a much deeper and detailed analysis of the PCA-based lung motion model. We provide the theoretical justification of the effectiveness of PCA in modeling lung motion. We also prove that under certain conditions, the PCA motion model is equivalent to 5D motion model, which is based on physiology and anatomy of the lung. The modeling power of PCA model was tested on clinical data and the average 3D error was found to be below 1 mm.

  5. Remifentalino intravenoso mediante infusor elastomerico frente a meperidina intramuscular: Estudio comparativo en analgesia obstetrica Intravenous remifentanil delivered through an elastomeric device versus intramuscular meperidine comparative study for obstetric analgesia

    OpenAIRE

    E. Calderón; Martínez, E.; M. D. Román; A. Pernio; R. García-Hernández; L. M. Torres

    2006-01-01

    Objetivos: Evaluar la eficacia y seguridad de remifentanilo administrado mediante infusor elastomérico con PCA iv en analgesia obstétrica comparado con meperidina intramuscular en parturientas con contraindicación para analgesia epidural. Material y Método: Se seleccionaron aletoriamente 24 parturientas, se asoció infusor elastomérico Baxter® con 250 ml de suero fisiológico con 2,5 mg de remifentanilo y un ritmo de 12 ml·h ¹, lo que supone una infusión media de 0,025 μg·kg-1·min-1 de rem...

  6. Analgesia pós-operatória em cesarianas com a associação de morfina por via subaracnóidea e antiinflamatório não esteróide: diclofenaco versus cetoprofeno

    Directory of Open Access Journals (Sweden)

    Hirahara Jacqueline Toshiko

    2003-01-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: A associação de baixas doses de morfina subaracnóidea e diclofenaco por via muscular tem se mostrado eficaz para o controle da dor pós-operatória em pacientes submetidas à cesariana sob raquianestesia. O cetoprofeno pode ser vantajoso em relação ao diclofenaco, já que sua administração pode ser realizada por via venosa. O objetivo do estudo foi comparar a eficácia analgésica do diclofenaco e do cetoprofeno, quando administrados em associação com baixas doses de morfina subaracnóidea no pós-operatório imediato de pacientes submetidas à cesariana sob raquianestesia. MÉTODO: Foram estudadas prospectivamente 44 pacientes estado físico ASA I ou II submetidas à cesariana sob raquianestesia com 15 mg de bupivacaína hiperbárica e 28 µg de morfina. Após 90 minutos do início da anestesia, as pacientes foram divididas aleatoriamente em dois grupos que receberam: Grupo D (n = 22: 75 mg de diclofenaco por via muscular e Grupo C (n = 22: 100 mg de cetoprofeno em 100 ml de solução glicosada a 5% por via venosa, em 20 minutos. A dor foi avaliada com a escala analógica visual de dor (EAV - 0 cm indicando ausência de dor e 10 cm indicando dor insuportável, imediatamente antes e a cada hora após a administração do antiinflamatório (AINE, por um período de 6 horas. A analgesia complementar foi realizada utilizando-se a bomba de analgesia controlada pelo paciente (ACP por via venosa, com bolus de 1 mg de morfina, intervalo de bloqueio de 7 minutos, sem infusão basal e dose máxima de morfina de 20 mg em 4 horas. Avaliou-se a dor, a necessidade de utilização de medicação analgésica de resgate, o consumo cumulativo de morfina nas seis primeiras horas após a administração do AINE, e a ocorrência de prurido, náusea, vômito e depressão respiratória. RESULTADOS: Os grupos D e C foram semelhantes em relação às médias de dor e doses cumulativas de morfina na ACP nas seis primeiras horas ap

  7. Analgesia in PACU: indications, monitoring, complications.

    Science.gov (United States)

    Savoia, Gennaro; Gravino, Elvira; Loreto, Maria; Erman, Alfredo

    2005-11-01

    The correct treatment of postoperative pain, in the early period immediately following surgery, is founded on the following four principles: 1-correct diagnosis of the source and magnitude of nociception; 2-understanding of the relationship of ongoing nociception and other components of pain including anxiety, ethnocultural components, meaning, prior experience; 3-treatment by establishment and maintenance of drug level at active sites to achieve and maintain analgesia and anxiolysis as appropriate; 4-continued re-evaluation of the therapy and refinement of the approach. The PACU standard of cure requires a strict accordance between intra and postoperative analgesia. It requires "proactive preoperative plan" that includes: preoperative patient evaluation; discussion with a single patient on different treatment options; patient and family education; pre-emptive measures as indicated; intra-operative multimodal analgesia; a correct triage of analgesia, just after initial evaluation of vital parameters in PACU; re-evaluation of analgesia plan, if analgesia is inadequate; a new titration, intravenous or epidural way, in order to achieve a stable VAS < 3; plan a new analgesia scheme or confirm a preoperative plan; control of adverse events, related to analgesia plan (gastric bleeding and/or bleeding of the surgical wound site, NSAIDs-induced renal damage, respiratory depression, delayed canalisation, nausea, vomiting, excessive sedation, difficulty in bladder emptying, itchiness); a transmission of analgesia plan to ward nurses; a control quality for verify at prefixed times patients satisfaction level, analgesia performed, adverse effects percent, analgesia related, plan variations percent. PMID:16305454

  8. Pain Levels Within 24 Hours After UFE: A Comparison of Morphine and Fentanyl Patient-Controlled Analgesia

    International Nuclear Information System (INIS)

    The purpose of this study was to assess the presence and severity of pain levels during 24 h after uterine fibroid embolization (UFE) for symptomatic leiomyomata and compare the effectiveness and adverse effects of morphine patient-controlled analgesia (PCA) versus fentanyl PCA. We carried out a prospective, nonrandomized study of 200 consecutive women who received UFE and morphine or fentanyl PCA after UFE. Pain perception levels were obtained on a 0-10 scale for the 24-h period after UFE. Linear regression methods were used to determine pain trends and differences in pain trends between two groups and the association between pain scores and patient covariates. One hundred eighty-five patients (92.5%) reported greater-than-baseline pain after UFE, and 198 patients (99%) required IV opioid PCA. One hundred thirty-six patients (68.0%) developed nausea during the 24-h period. Seventy-two patients (36%) received morphine PCA and 128 (64%) received fentanyl PCA, without demographic differences. The mean dose of morphine used was 33.8 ± 26.7 mg, while the mean dose of fentanyl was 698.7 ± 537.4 μg. Using this regimen, patients who received morphine PCA had significantly lower pain levels than those who received fentanyl PCA (p < 0.0001). We conclude that patients develop pain requiring IV opioid PCA within 24 h after UFE. Morphine PCA is more effective in reducing post-uterine artery embolization pain than fentanyl PCA. Nausea is a significant adverse effect from opioid PCA.

  9. Epidural analgesia for cardiac surgery

    NARCIS (Netherlands)

    V. Svircevic; M.M. Passier; A.P. Nierich; D. van Dijk; C.J. Kalkman; G.J. van der Heijden

    2013-01-01

    Background A combination of general anaesthesia (GA) with thoracic epidural analgesia (TEA) may have a beneficial effect on clinical outcomes by reducing the risk of perioperative complications after cardiac surgery. Objectives The objective of this review was to determine the impact of perioperativ

  10. PCA3 and PCA3-Based Nomograms Improve Diagnostic Accuracy in Patients Undergoing First Prostate Biopsy

    Directory of Open Access Journals (Sweden)

    Virginie Vlaeminck-Guillem

    2013-08-01

    Full Text Available While now recognized as an aid to predict repeat prostate biopsy outcome, the urinary PCA3 (prostate cancer gene 3 test has also been recently advocated to predict initial biopsy results. The objective is to evaluate the performance of the PCA3 test in predicting results of initial prostate biopsies and to determine whether its incorporation into specific nomograms reinforces its diagnostic value. A prospective study included 601 consecutive patients addressed for initial prostate biopsy. The PCA3 test was performed before ≥12-core initial prostate biopsy, along with standard risk factor assessment. Diagnostic performance of the PCA3 test was evaluated. The three available nomograms (Hansen’s and Chun’s nomograms, as well as the updated Prostate Cancer Prevention Trial risk calculator; PCPT were applied to the cohort, and their predictive accuracies were assessed in terms of biopsy outcome: the presence of any prostate cancer (PCa and high-grade prostate cancer (HGPCa. The PCA3 score provided significant predictive accuracy. While the PCPT risk calculator appeared less accurate; both Chun’s and Hansen’s nomograms provided good calibration and high net benefit on decision curve analyses. When applying nomogram-derived PCa probability thresholds ≤30%, ≤6% of HGPCa would have been missed, while avoiding up to 48% of unnecessary biopsies. The urinary PCA3 test and PCA3-incorporating nomograms can be considered as reliable tools to aid in the initial biopsy decision.

  11. Five-year experience of critical incidents associated with patient-controlled analgesia in an Irish University Hospital.

    LENUS (Irish Health Repository)

    Ahmad, I

    2012-02-01

    BACKGROUND: Patient-controlled analgesia (PCA) is a common and effective means of managing post-operative pain. We sought to identify factors that may lead to critical incidents (CIs) in patient safety when using PCA in our institution. METHODS: An observational study of prospectively collected data of patients who received PCA from 2002 to 2006 was performed. All CIs were documented and analysed by staff members of the acute pain service (APS). Cause analysis of CIs was undertaken to determine if measures can be instituted to prevent recurrence of similar events. RESULTS: Over eight thousand patients (8,240) received PCA. Twenty-seven CIs were identified. Eighteen were due to programming errors. Other CIs included co-administration of opioids and oversedation. CONCLUSION: In our institution, the largest contributory factor to CIs with PCAs was programming error. Strategies to minimize this problem include better education and surveillance.

  12. Decision tree-based learning to predict patient controlled analgesia consumption and readjustment

    Directory of Open Access Journals (Sweden)

    Hu Yuh-Jyh

    2012-11-01

    Full Text Available Abstract Background Appropriate postoperative pain management contributes to earlier mobilization, shorter hospitalization, and reduced cost. The under treatment of pain may impede short-term recovery and have a detrimental long-term effect on health. This study focuses on Patient Controlled Analgesia (PCA, which is a delivery system for pain medication. This study proposes and demonstrates how to use machine learning and data mining techniques to predict analgesic requirements and PCA readjustment. Methods The sample in this study included 1099 patients. Every patient was described by 280 attributes, including the class attribute. In addition to commonly studied demographic and physiological factors, this study emphasizes attributes related to PCA. We used decision tree-based learning algorithms to predict analgesic consumption and PCA control readjustment based on the first few hours of PCA medications. We also developed a nearest neighbor-based data cleaning method to alleviate the class-imbalance problem in PCA setting readjustment prediction. Results The prediction accuracies of total analgesic consumption (continuous dose and PCA dose and PCA analgesic requirement (PCA dose only by an ensemble of decision trees were 80.9% and 73.1%, respectively. Decision tree-based learning outperformed Artificial Neural Network, Support Vector Machine, Random Forest, Rotation Forest, and Naïve Bayesian classifiers in analgesic consumption prediction. The proposed data cleaning method improved the performance of every learning method in this study of PCA setting readjustment prediction. Comparative analysis identified the informative attributes from the data mining models and compared them with the correlates of analgesic requirement reported in previous works. Conclusion This study presents a real-world application of data mining to anesthesiology. Unlike previous research, this study considers a wider variety of predictive factors, including PCA

  13. Analgesia combinada vs analgesia peridural para trabajo de parto

    Directory of Open Access Journals (Sweden)

    Juan Pablo Aristizábal

    2005-06-01

    Full Text Available Introducción: Las ventajas de la analgesia epidural-espinal incluyen una identificación confiable del espacio subaracnoideo, requerimiento de poco fármaco, disminución de toxicidad sistemica y analgesia de instauración rápida. En este estudio se comparan las técnicas peridural y epidural-espinal. Materiales y Métodos: Se incluyeron 200 pacientes en un periodo de 12 meses. Los criterios de inclusión fueron mujeres en trabajo de parto con dilatación mayor o igual a 5 cm sin patologías asociadas. Se evalúo la respuesta analgésica a los 5 y 15 minutos, la respuesta hemodinamica, bloqueo motor, efectos adversos y respuesta fetal. La técnica peridural se realizo con bupivacaina al 0.065% y la técnica epidural-espinal con fentanyl 25mcg intratecales sin anestésico local. Resultados : Cada grupo incluyó 100 pacientes (peridural o analgesia A y epidural-espinal o analgesia B. La percepción de dolor fue similar en ambos grupos a los 5 minutos (p value = 0.291, a los 15 minutos fue menor con analgesia epidural-espinal (p value = 0.008. No hubo cambios hemodinamicos ni bloqueo motor ni diferencia fetal en ambos grupos. Se encontró una incidencia de prurito con la técnica epidural-espinal de 36%. Conclusión: La analgesia epidural-espinal con opioides intratecales produce mayor disminución en la percepción del dolor a los 15 minutos comparado con la peridural, sin presentar cambios hemodinamicos ni bloqueo motor y sin alteración en el recién nacido, con una incidencia de 36% de prurito.Backround: The advantage of epidural-spinal analgesia technique include better subaracnoid space identification, less drug requirements, less sistemic toxicity, and rapid analgesic effect. In this study we compare peridural and peridural-spinal tecnique. Methods: The study included 200 patients during a period of 12 months. The inclusion criteria were women during labour with dilatation of 5cm or more without any associated pathology. The study evaluate

  14. Efeitos da analgesia peridural e do bloqueio contínuo do plexo lombar sobre a reabilitação funcional após artroplastia total do quadril Efectos de la analgesia epidural y del bloqueo continuo del plexo lumbar sobre la rehabilitación funcional después de la artroplastia total de cadera Effects of epidural analgesia and continuous lumbar plexus block on functional rehabilitation after total hip arthroplasty

    Directory of Open Access Journals (Sweden)

    Leonardo Teixeira Domingues Duarte

    2009-10-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: A dor após artroplastia total do quadril (ATQ é intensa e agravada pelas mobilizações, o que demanda técnica analgésica eficaz e que permita mobilidade precoce, participação nas atividades de reabilitação e rápida recuperação funcional. O objetivo do estudo foi comparar os efeitos das técnicas de analgesia controlada pelo paciente (ACP pelas vias peridural e perineural do plexo lombar sobre a reabilitação funcional em pacientes submetidos à ATQ. MÉTODO: Pacientes estado físico ASA I a III foram alocados aleatoriamente nos grupos Peridural e Lombar. Para a ATQ, foi realizada anestesia peridural lombar contínua com ropivacaína a 0,5% (Peridural ou bloqueio contínuo do plexo lombar com ropivacaína a 0,5% (Lombar. Na sala de recuperação, iniciou-se ACP com infusão de ropivacaína a 0,2% (Lombar ou ropivacaína a 0,2% + fentanil 3 µg.mL-1 (Peridural. A eficácia da analgesia nas primeiras 48 horas após a ATQ (escores de dor, consumo de morfina de resgate e de bolos da bomba de ACP foi comparada entre os grupos. Diferentes parâmetros da reabilitação pós-operatória foram estudados. RESULTADOS: Quarenta e um pacientes foram submetidos à análise estatística. Os escores de dor em repouso foram semelhantes nos dois grupos. Apesar do controle mais efetivo da dor dinâmica no grupo Peridural e o uso de morfina ter sido maior, mais frequente e mais precoce no grupo Lombar, não houve diferença entre os grupos em nenhum dos parâmetros estudados de reabilitação. As técnicas de analgesia não influenciaram as falhas no processo de reabilitação. CONCLUSÕES: A maior efetividade da analgesia peridural não se traduziu em melhora no processo de reabilitação, nem reduziu o tempo necessário para alcançar os desfechos estudados.JUSTIFICATIVA Y OBJETIVOS: El dolor después de la artroplastia total de la cadera (ATC es intenso y se agrava por los movimientos, lo que demanda una técnica analg

  15. PEM-PCA: A Parallel Expectation-Maximization PCA Face Recognition Architecture

    Science.gov (United States)

    Rujirakul, Kanokmon; Arnonkijpanich, Banchar

    2014-01-01

    Principal component analysis or PCA has been traditionally used as one of the feature extraction techniques in face recognition systems yielding high accuracy when requiring a small number of features. However, the covariance matrix and eigenvalue decomposition stages cause high computational complexity, especially for a large database. Thus, this research presents an alternative approach utilizing an Expectation-Maximization algorithm to reduce the determinant matrix manipulation resulting in the reduction of the stages' complexity. To improve the computational time, a novel parallel architecture was employed to utilize the benefits of parallelization of matrix computation during feature extraction and classification stages including parallel preprocessing, and their combinations, so-called a Parallel Expectation-Maximization PCA architecture. Comparing to a traditional PCA and its derivatives, the results indicate lower complexity with an insignificant difference in recognition precision leading to high speed face recognition systems, that is, the speed-up over nine and three times over PCA and Parallel PCA. PMID:24955405

  16. PEM-PCA: A Parallel Expectation-Maximization PCA Face Recognition Architecture

    Directory of Open Access Journals (Sweden)

    Kanokmon Rujirakul

    2014-01-01

    Full Text Available Principal component analysis or PCA has been traditionally used as one of the feature extraction techniques in face recognition systems yielding high accuracy when requiring a small number of features. However, the covariance matrix and eigenvalue decomposition stages cause high computational complexity, especially for a large database. Thus, this research presents an alternative approach utilizing an Expectation-Maximization algorithm to reduce the determinant matrix manipulation resulting in the reduction of the stages’ complexity. To improve the computational time, a novel parallel architecture was employed to utilize the benefits of parallelization of matrix computation during feature extraction and classification stages including parallel preprocessing, and their combinations, so-called a Parallel Expectation-Maximization PCA architecture. Comparing to a traditional PCA and its derivatives, the results indicate lower complexity with an insignificant difference in recognition precision leading to high speed face recognition systems, that is, the speed-up over nine and three times over PCA and Parallel PCA.

  17. Grassmann Averages for Scalable Robust PCA

    DEFF Research Database (Denmark)

    Hauberg, Søren; Feragen, Aasa; Black, Michael J.

    2014-01-01

    As the collection of large datasets becomes increasingly automated, the occurrence of outliers will increase—“big data” implies “big outliers”. While principal component analysis (PCA) is often used to reduce the size of data, and scalable solutions exist, it is well-known that outliers can arbit......, making it scalable to “big noisy data.” We demonstrate TGA for background modeling, video restoration, and shadow removal. We show scalability by performing robust PCA on the entire Star Wars IV movie....

  18. Sedation and Analgesia in Interventional Radiology

    OpenAIRE

    Tuite, Catherine; Rosenberg, Eric J.

    2005-01-01

    Complex medical procedures requiring the administration of sedation and analgesia are frequently performed in sites outside the operating room. In particular, interventional radiologists must understand basic principles of sedation and analgesia to direct nurses or nurse practitioners to provide adequate conscious sedation. The purpose of this article is to review basic principles of sedation, pharmacologic agents used for sedation and analgesia, practice guidelines, monitoring, and managemen...

  19. Epidural labour analgesia using Bupivacaine and Clonidine

    OpenAIRE

    Syal, K; R K Dogra; A Ohri; Chauhan, G.; Goel, A.

    2011-01-01

    Background: To compare the effects of addition of Clonidine (60 μg) to Epidural Bupivacaine (0.125%) for labour analgesia, with regard to duration of analgesia, duration of labour, ambulation, incidence of instrumentation and caesarean section, foetal outcome, patient satisfaction and side effects. Patients & Methods: On demand, epidural labour analgesia was given to 50 nulliparous healthy term parturients (cephalic presentation), divided in two groups randomly. Group I received bupivacain...

  20. Effect of ketamine on intravenous patient-controlled analgesia using hydromorphone and ketorolac after the Nuss surgery in pediatric patients

    OpenAIRE

    Min, Too Jae; Kim, Woon Young; Jeong, Won Ju; Choi, Jae Ho; Lee, Yoon Sook; Kim, Jae Hwan; Park, Young Cheol

    2012-01-01

    Background Nuss surgery is preferred in pectus excavatum repair because this procedure produces excellent cosmetic results and prevents postoperative distressed pulmonary function. However, the procedure causes severe pain due to thoracic expansion. This study was designed to investigate the analgesic effect of small doses of ketamine on an intravenous patient-controlled analgesia (IV-PCA) using hydromorphone and ketorolac for pain control after Nuss surgery. Methods Forty-four patients under...

  1. Beneficial Effects of Adding Ketamine to Intravenous Patient-Controlled Analgesia with Fentanyl after the Nuss Procedure in Pediatric Patients

    OpenAIRE

    Cha, Moon Ho; Eom, Ji Hye; Lee, Yoon Sook; Kim, Woon Young; Park, Young Cheol; Min, Sam Hong; Kim, Jae Hwan

    2012-01-01

    Purpose The aim of this prospective, double-blind, randomized study was to investigate the analgesic effects of low-dose ketamine on intravenous patient-controlled analgesia (IV-PCA) with fentanyl for pain control in pediatric patients following the Nuss procedure for pectus excavatum. Materials and Methods Sixty pediatric patients undergoing the Nuss procedure were randomly assigned to receive fentanyl (Group F, n=30) or fentanyl plus ketamine (Group FK, n=30). Ten minutes before the end of ...

  2. Single dose spinal analgesia: Is it a good alternative to epidural analgesia in controlling labour pain?

    Directory of Open Access Journals (Sweden)

    Tarek AbdElBarr

    2014-07-01

    Conclusions: Based on the results of our study we concluded that single dose spinal analgesia is a good alternative to epidural analgesia in controlling labour pain i.e. spinal compared to epidural is more easy performed, faster, less expensive, and provide effective analgesia.

  3. Bloqueio do plexo lombar pela via posterior para analgesia pós-operatória em artroplastia total do quadril: estudo comparativo entre Bupivacaína a 0,5% com Epinefrina e Ropivacaína a 0,5% Bloqueo del plexo lumbar por la vía posterior para analgesia postoperatoria en artroplastia total de la cadera: estudio comparativo entre Bupivacaína a 0,5% con Epinefrina y Ropivacaína a 0,5% Posterior lumbar plexus block in postoperative analgesia for total hip arthroplasty: a comparative study between 0.5% Bupivacaine with Epinephrine and 0.5% Ropivacaine

    OpenAIRE

    Leonardo Teixeira Domingues Duarte; Franklin Cespedes Paes; Maria do Carmo Barreto de C. Fernandes; Renato Ângelo Saraiva

    2009-01-01

    JUSTIFICATIVA E OBJETIVOS: O bloqueio do plexo lombar pela via posterior promove analgesia pós-operatória efetiva na artroplastia total do quadril. Ropivacaína e bupivacaína não apresentaram qualquer diferença na eficácia analgésica em diferentes bloqueios de nervos periféricos. O objetivo deste estudo foi comparar a eficácia da analgesia pós-operatória resultante da administração em dose única da bupivacaína a 0,5% ou da ropivacaína a 0,5% no bloqueio do plexo lombar pela via posterior na ar...

  4. Efficacy of trans abdominis plane block for post cesarean delivery analgesia: A double-blind, randomized trial

    Directory of Open Access Journals (Sweden)

    Uma Srivastava

    2015-01-01

    Full Text Available Background: The transverse abdominis plane (TAP block, a regional block provides effective analgesia after lower abdominal surgeries if used as part of multimodal analgesia. In this prospective, randomized double-blind study, we determined the efficacy of TAP block in patients undergoing cesarean section. Materials and Methods: Totally, 62 parturients undergoing cesarean section were randomized in a double-blind manner to receive either bilateral TAP block at the end of surgery with 20 ml of 0.25% bupivacaine or no TAP block, in addition to standard analgesic comprising 75 mg diclofenac 8 hourly and intravenous patient-controlled analgesia (PCA tramadol. Each patient was assessed at 0, 4, 8, 12, 24, 36, and 48 h after surgery by an independent observer for pain at rest and on movement using numeric rating scale of 0-10, time of 1 st demand for tramadol, total consumption of PCA tramadol, satisfaction with pain management and side effects. Results: Use of tramadol was reduced in patients given TAP block by 50% compared to patients given no block during 48 h after surgery (P < 0.001. Pain scores were lower both on rest and activity at each time point for 24 h in study group (P < 0.001, time of first analgesia was significantly longer, satisfaction was higher, and side effects were less in study group compared to control group. Conclusion: Transverse abdominis plane block was effective in providing analgesia with a substantial reduction in tramadol use during 48 h after cesarean section when used as adjunctive to standard analgesia.

  5. Sucrose ingestion causes opioid analgesia

    Directory of Open Access Journals (Sweden)

    Segato F.N.

    1997-01-01

    Full Text Available The intake of saccharin solutions for relatively long periods of time causes analgesia in rats, as measured in the hot-plate test, an experimental procedure involving supraspinal components. In order to investigate the effects of sweet substance intake on pain modulation using a different model, male albino Wistar rats weighing 180-200 g received either tap water or sucrose solutions (250 g/l for 1 day or 14 days as their only source of liquid. Each rat consumed an average of 15.6 g sucrose/day. Their tail withdrawal latencies in the tail-flick test (probably a spinal reflex were measured immediately before and after this treatment. An analgesia index was calculated from the withdrawal latencies before and after treatment. The indexes (mean ± SEM, N = 12 for the groups receiving tap water for 1 day or 14 days, and sucrose solution for 1 day or 14 days were 0.09 ± 0.04, 0.10 ± 0.05, 0.15 ± 0.08 and 0.49 ± 0.07, respectively. One-way ANOVA indicated a significant difference (F(3,47 = 9.521, P<0.001 and the Tukey multiple comparison test (P<0.05 showed that the analgesia index of the 14-day sucrose-treated animals differed from all other groups. Naloxone-treated rats (N = 7 receiving sucrose exhibited an analgesia index of 0.20 ± 0.10 while rats receiving only sucrose (N = 7 had an index of 0.68 ± 0.11 (t = 0.254, 10 degrees of freedom, P<0.03. This result indicates that the analgesic effect of sucrose depends on the time during which the solution is consumed and extends the analgesic effects of sweet substance intake, such as saccharin, to a model other than the hot-plate test, with similar results. Endogenous opioids may be involved in the central regulation of the sweet substance-produced analgesia.

  6. Administration of paracetamol versus dipyrone by intravenous patient-controlled analgesia for postoperative pain relief in children after tonsillectomy

    Directory of Open Access Journals (Sweden)

    Mesut Sener

    2015-12-01

    Full Text Available BACKGROUND AND OBJECTIVE: We compared the efficacy of intravenous (IV paracetamol versus dipyrone via patient-controlled analgesia (PCA for postoperative pain relief in children. METHODS: The study was composed of 120 children who had undergone elective tonsillectomy after receiving general anesthesia. Patients were divided into 3 groups according to the dosage of postoperative intravenous-patient-controlled analgesia: paracetamol, dipyrone, or placebo. Pain was evaluated using a 0- to 100-mm visual analog scale and 1- to 4-pain relief score at 30 min, 1, 2, 4, 6, 12, and 24 h postoperatively. Pethidine (0.25 mg kg-1 was administered intravenously to patients requiring rescue analgesia. Pethidine requirements were recorded during the first 24 h postoperatively, and treatment related adverse effects were noted. RESULTS: Postoperative visual analog scale scores were significantly lower with paracetamol group compared with placebo group at 6 h (p 0.05. Postoperative pethidine requirements were significantly lower with paracetamol and dipyrone groups compared with placebo group (62.5%, 68.4% vs 90%, p 0.05. CONCLUSIONS: Paracetamol and dipyrone have well tolerability profile and effective analgesic properties when administered IV-PCA for postoperative analgesia in children after tonsillectomy.

  7. Etoricoxib - preemptive and postoperative analgesia (EPPA in patients with laparotomy or thoracotomy - design and protocols

    Directory of Open Access Journals (Sweden)

    Hatz Rudolf

    2010-05-01

    Full Text Available Abstract Background and Objective Our objective was to report on the design and essentials of the Etoricoxib protocol- Preemptive and Postoperative Analgesia (EPPA Trial, investigating whether preemptive analgesia with cox-2 inhibitors is more efficacious than placebo in patients who receive either laparotomy or thoracotomy. Design and Methods The study is a 2 × 2 factorial armed, double blinded, bicentric, randomised placebo-controlled trial comparing (a etoricoxib and (b placebo in a pre- and postoperative setting. The total observation period is 6 months. According to a power analysis, 120 patients scheduled for abdominal or thoracic surgery will randomly be allocated to either the preemptive or the postoperative treatment group. These two groups are each divided into two arms. Preemptive group patients receive etoricoxib prior to surgery and either etoricoxib again or placebo postoperatively. Postoperative group patients receive placebo prior to surgery and either placebo again or etoricoxib after surgery (2 × 2 factorial study design. The Main Outcome Measure is the cumulative use of morphine within the first 48 hours after surgery (measured by patient controlled analgesia PCA. Secondary outcome parameters include a broad range of tests including sensoric perception and genetic polymorphisms. Discussion The results of this study will provide information on the analgesic effectiveness of etoricoxib in preemptive analgesia and will give hints on possible preventive effects of persistent pain. Trial registration NCT00716833

  8. Patient-controlled analgesia in the pediatric population: morphine versus hydromorphone

    Directory of Open Access Journals (Sweden)

    DiGiusto M

    2014-08-01

    Full Text Available Matthew DiGiusto,2 Tarun Bhalla,1 David Martin,1 Derek Foerschler,3 Megan J Jones,2 Joseph D Tobias1 1Department of Anesthesiology and Pain Medicine, Nationwide Children's Hospital and the Ohio State University, 2The Ohio State School of Medicine, 3Department of Anesthesiology, The Ohio State University, Columbus, OH, USA Objective: Patient controlled analgesia (PCA is commonly used to provide analgesia following surgical procedures in the pediatric population. Morphine and hydromorphone remain the most commonly used opioids for PCA. Although both are effective, adverse effects may occur. When these adverse effects are unremitting or severe, opioid rotation may be required. In this study, we retrospectively evaluated PCA use, the adverse effect profile, and the frequency of opioid rotation. Methods: This retrospective study was performed at Nationwide Children’s Hospital (Columbus, OH. The hospital's electronic registry was queried for PCA use delivering either morphine or hydromorphone from January 1, 2008 to December 31, 2010. Results: A total of 514 patients were identified, that met study entry criteria. Of the 514 cases, 298 (56.2% were initially started on morphine and 225 (43.8% were initially started on hydromorphone. There were a total of 26 (5.1% opioid changes in the cohort of 514 patients. Of the 26 switches, 23 of 298 (7.7% were from morphine to hydromorphone, and 3 of 225 (1.3% were from hydromorphone to morphine (P=0.0008. Of the 17 morphine-to-hydromorphone switches with adverse effects, pruritus (64.7%, and inadequate pain control (47.1% were the most common side effects. The most common side effect resulting in a hydromorphone-to-morphine switch was nausea (66.7%. Conclusion: PCA switches from morphine-to-hydromorphone (88.5% were more common than vice-versa (11.5%. The most common reasons for morphine-to-hydromorphone switch were pruritus and inadequate pain control. These data suggest that a prospective study is necessary

  9. Nurses' Perceptions and Attitudes Toward Use of Oral Patient-Controlled Analgesia.

    Science.gov (United States)

    Riemondy, Susan; Gonzalez, Lorie; Gosik, Kirk; Ricords, Amy; Schirm, Victoria

    2016-04-01

    Patient-controlled analgesia (PCA) administered intravenously is a generally well-accepted therapy by nurses and patients. PCA devices are now available for oral medications, allowing patients to self-administer pain pills without requesting them from the nurse. Successful introduction of new pain medication delivery devices can depend on nurses' knowledge and attitudes. The aim of this institutional review board approved project was to evaluate nurses' perceptions and attitudes toward using an oral PCA device for patients' pain. A 4-week study was designed and conducted at an academic medical center on an orthopedic unit and a women's health unit. Nurse participants received education on using the oral PCA device and were invited to complete a pre- and poststudy knowledge and attitude survey regarding pain management. Nurses and patients also completed a questionnaire about perceptions related to using the oral PCA device. Findings showed that nurses' attitudes toward using the oral PCA device were less favorable than those of patients, suggesting that nurses may require additional education for acceptance of this device. Results from 37 nurses showed improvement in overall knowledge and attitudes, from 70.8% pretest to 74.2% post-test. Although improvement was not statistically significant (p = .1637), two items showed significant improvement. Knowledge about the effectiveness of NSAIDS was 27.5% pretest compared with 60.0% post-test (p = .0028); and understanding about use of opioids in patients with a history of substance abuse was 50% pretest compared with 70% post-test (p = .0531). Helping nurses overcome the perceived barriers to use of an oral PCA device has potential implications for better pain management as well as enhanced patient satisfaction. PMID:27091584

  10. PCA3 and PCA3-Based Nomograms Improve Diagnostic Accuracy in Patients Undergoing First Prostate Biopsy

    OpenAIRE

    Virginie Vlaeminck-Guillem; Paul Perrin; Philippe Paparel; Claire Rodriguez-Lafrasse; Myriam Decaussin-Petrucci; Alain Ruffion; Denis Champetier; Marian Devonec

    2013-01-01

    While now recognized as an aid to predict repeat prostate biopsy outcome, the urinary PCA3 (prostate cancer gene 3) test has also been recently advocated to predict initial biopsy results. The objective is to evaluate the performance of the PCA3 test in predicting results of initial prostate biopsies and to determine whether its incorporation into specific nomograms reinforces its diagnostic value. A prospective study included 601 consecutive patients addressed for initial prostate biopsy. Th...

  11. An evaluation of obstetrical analgesia.

    Science.gov (United States)

    FIST, H S

    1954-02-01

    Relief of pain and safety of mother and child are fundamentals in obstetrical analgesia. Elimination of those drugs which are ineffective or dangerous is the best guide to proper medication. Morphine, codeine, or similar opium derivatives should be avoided as they depress fetal respiration. Barbiturates have the same fault, despite their popularity. Demerol in small dosage is safe and effective. Scopolamine yields excellent results with safety. Magnesium sulfate potentiates and reinforces the action of scopolamine and involves no danger. This combination of drugs may be used by any competent general practitioner in the home or hospital. PMID:13126811

  12. Postoperative analgesia in elderly patients.

    Science.gov (United States)

    Falzone, Elisabeth; Hoffmann, Clément; Keita, Hawa

    2013-02-01

    Elderly people represent the fastest-growing segment of our society and undergo surgery more frequently than other age groups. Effective postoperative analgesia is essential in these patients because inadequate pain control after surgery is associated with adverse outcomes in elderly patients. However, management of postoperative pain in older patients may be complicated by a number of factors, including a higher risk of age- and disease-related changes in physiology and disease-drug and drug-drug interactions. Physiological changes related to aging need to be carefully considered because aging is individualized and progressive. Assessment of pain management needs to include chronological age, biological age with regard to renal, liver and cardiac functions, and the individual profile of pathology and prescribed medications. In addition, ways in which pain should be assessed, particularly in patients with cognitive impairment, must be considered. Cognitively intact older patients can use most commonly used unidimensional pain scales such as the visual analogue scale (VAS), verbal rating scale (VRS), numeric rating scale (NRS) and facial pain scale (FPS). VRS and NRS are the most appropriate pain scales for the elderly. In older patients with mild to moderate cognitive impairment, the VRS is a better tool. For severe cognitively impaired older patients, behavioural scales validated in the postoperative context, such as Doloplus-2 or Algoplus, are appropriate. For postoperative pain treatment, most drugs (e.g. paracetamol, nonsteroidal anti-inflammatory drugs, nefopam, tramadol, codeine, morphine, local anaesthetics), techniques (e.g. intravenous morphine titration, subcutaneous morphine, intravenous or epidural patient-controlled analgesia, intrathecal morphine, peripheral nerve block) and strategies (e.g. anticipated intraoperative analgesia or multimodal analgesia) used for acute pain management can be used in older patients. However, in view of pharmacokinetic

  13. PCA based Iris Recognition using DWT

    Directory of Open Access Journals (Sweden)

    Shashi Kumar D R

    2011-07-01

    Full Text Available The Iris pattern is an important biological feature of human body. The recognition of an individual based on iris pattern is gaining more popularity due to the uniqueness of the pattern among the people. In this paper PCA based iris recognition using DWT (PIRDWT is proposed. The upper and lower portion of the iris which is occluded by the eyelids and eyelashes is removed using morphological process. According to Springer Analysis of CASIA data base, to get better recognition forty five pixels to left and right of the pupil boundary is considered as iris template for the proposed algorithm analysis. The image is enhanced using Histogram Equalization to get high contrast. DWT is applied on histogram equalised iris template to get DWT coefficients. The features are extracted from the approximation band of the DWT coefficients using PCA. Multiple classifiers such as KNN, RF and SVM are used for matching. The proposed algorithm has better performance parameters compared to existing algorithm.

  14. Information criterion based fast PCA adaptive algorithm

    Institute of Scientific and Technical Information of China (English)

    Li Jiawen; Li Congxin

    2007-01-01

    The novel information criterion (NIC) algorithm can find the principal subspace quickly, but it is not an actual principal component analysis (PCA) algorithm and hence it cannot find the orthonormal eigen-space which corresponds to the principal component of input vector.This defect limits its application in practice.By weighting the neural network's output of NIC, a modified novel information criterion (MNIC) algorithm is presented.MNIC extractes the principal components and corresponding eigenvectors in a parallel online learning program, and overcomes the NIC's defect.It is proved to have a single global optimum and nonquadratic convergence rate, which is superior to the conventional PCA online algorithms such as Oja and LMSER.The relationship among Oja, LMSER and MNIC is exhibited.Simulations show that MNIC could converge to the optimum fast.The validity of MNIC is proved.

  15. Remifentalino intravenoso mediante infusor elastomerico frente a meperidina intramuscular: Estudio comparativo en analgesia obstetrica Intravenous remifentanil delivered through an elastomeric device versus intramuscular meperidine comparative study for obstetric analgesia

    Directory of Open Access Journals (Sweden)

    E. Calderón

    2006-10-01

    Full Text Available Objetivos: Evaluar la eficacia y seguridad de remifentanilo administrado mediante infusor elastomérico con PCA iv en analgesia obstétrica comparado con meperidina intramuscular en parturientas con contraindicación para analgesia epidural. Material y Método: Se seleccionaron aletoriamente 24 parturientas, se asoció infusor elastomérico Baxter® con 250 ml de suero fisiológico con 2,5 mg de remifentanilo y un ritmo de 12 ml·h ¹, lo que supone una infusión media de 0,025 μg·kg-1·min-1 de remifentanilo, permitiendo la administración de bolos de 5 ml con un tiempo de cierre de 30 minutos (Grupo R o 1 mg·kg¹ de meperidina y 2,5 mg de haloperidol (Grupo M vía intramuscular cada 4 h. Valoramos la intensidad del dolor cada 30 min mediante una escala analógica visual (EVA, tiempo de infusión, bolos administrados, el nivel de sedación mediante escala del estado de alerta y sedación evaluada por el observador (OAA/S, efectos adversos y el test de Apgar del recién nacido al minuto y a los 5 min. Resultados: No hubo diferencias en los datos antropométricos de ambos grupos. La duración media de la infusión en el grupo R fue de 280 ± 55 min y las necesidades de bolos de rescate de 1,2 ± 1,5. La dosis media de meperidina intramuscular en el grupo M fue de 120 ± 25 mg. La intensidad del dolor durante el parto fue significativamente menor en el grupo R durante todo el periodo de dilatación y expulsivo (pObjectives: To evaluate the effectiveness and security of remifentanil administered by means of elastomeric infusor with PCA IV compared obstetrical analgesia with intramuscular meperidine in obstetric patients with contraindication for epidural analgesia, Material and Method: 24 patients were randomized, an elastomeric infusor Baxter® with a capacity of 250 ml was filled with 2.5 mg of remifentanil and a 12 mililiter·h-1, was satarted, (average infusion of 0.025·kg-1·min-1 of remifentanil, and boluses of 5 ml with a time of closing

  16. Grassmann Averages for Scalable Robust PCA

    DEFF Research Database (Denmark)

    Hauberg, Søren; Feragen, Aasa; Black, Michael J.

    vectors (subspaces) or elements of vectors; we focus on the latter and use a trimmed average. The resulting Trimmed Grassmann Average (TGA) is particularly appropriate for computer vision because it is robust to pixel outliers. The algorithm has low computational complexity and minimal memory requirements......, making it scalable to “big noisy data.” We demonstrate TGA for background modeling, video restoration, and shadow removal. We show scalability by performing robust PCA on the entire Star Wars IV movie....

  17. Analgesia adjuvante e alternativa Analgesia adyuvante y alternativa Adjuvant and alternative analgesia

    OpenAIRE

    Nilton Bezerra do Vale

    2006-01-01

    JUSTIFICATIVA E OBJETIVOS: Embora a dor aguda e a crônica sejam habitualmente controladas com intervenções farmacológicas, 14 métodos complementares de analgesia adjuvante e alternativa (AAA) podem reduzir o uso e abuso na prescrição de analgésicos e diminuir os efeitos colaterais que eventualmente comprometem o estado fisiológico do paciente. CONTEÚDO: Todos os mecanismos antiálgicos atuam através da via espinal de controle da comporta de Melzack e Wall e/ou através da transdução do sinal no...

  18. Meningitis tras anestesia y analgesia espinal

    Directory of Open Access Journals (Sweden)

    M. Robles Romero

    2013-08-01

    Full Text Available El objetivo de esta revisión es una puesta al día en la etiología, diagnóstico, profilaxis y tratamiento de la meningitis tras anestesia y analgesia espinales. Aunque es una complicación mayor de esta técnica y su incidencia es baja, cada vez son más frecuentes los casos publicados en la literatura médica. Según su etiología se les clasifica en meningitis sépticas, víricas y asépticas. Las meningitis sépticas son las más frecuentes, y en su etiología cada vez juega un papel más destacado como agente implicado el estreptococo salivarius. Como meningitis asépticas se clasifican aquellas en las que el cultivo de líquido cefalorraquídeo es negativo, con un periodo de latencia de síntomas inferior a seis horas, que pueden cursar con eosinofilia en el líquido cefalorraquídeo y unos niveles cercanos a la normalidad en la glucorraquia. Suelen tener buena respuesta y evolución con tratamiento antibiótico con vancomicina y cefalosporinas de tercera generación. Como profilaxis incidir en las medidas de asepsia, sobre todo en el uso de mascarilla facial para realizar la técnica, como práctica para disminuir la incidencia de gérmenes cuyo origen está en la cavidad oral y orofaringe. Asimismo podrían reducir la incidencia de meningitis las medidas de asepsia tales como el lavado de manos, uso de guantes y asepsia de la piel. La diferenciación entre meningitis séptica y aséptica se hará con mayor seguridad cuando se estandaricen las técnicas para detectar genoma bacteriano en el líquido cefalorraquídeo; actualmente se etiquetan como meningitis asépticas aquellas en las que el cultivo de líquido cefalorraquídeo es negativo y cuya tinción de Gram es negativa. Pese a que el pronóstico y evolución en rasgos generales de las meningitis tras anestesia y analgesia espinal es bueno, en comparación con las meningitis adquiridas en la comunidad, por la escasa virulencia de las bacterias implicadas (Estreptococo salivarius

  19. A Patient-Controlled Analgesia Adaptor to Mitigate Postsurgical Pain for Combat Casualties With Multiple Limb Amputation: A Case Series.

    Science.gov (United States)

    Pasquina, Paul F; Isaacson, Brad M; Johnson, Elizabeth; Rhoades, Daniel S; Lindholm, Mark P; Grindle, Garrett G; Cooper, Rory A

    2016-08-01

    The use of explosive armaments during Operation Iraqi Freedom, Operation Enduring Freedom, and Operation New Dawn has resulted in a significant number of injured U.S. service members. These weapons often generate substantial extremity trauma requiring multiple surgical procedures to preserve life, limb, and restore function. For those individuals who require multiple surgeries, the use of patient-controlled analgesia (PCA) devices can be an effective way to achieve adequate pain management and promote successful rehabilitation and recovery during inpatient treatment. A subpopulation of patients are unable to independently control a PCA device because of severe multiple limb dysfunction and/or loss. In response to the needs of these patients, our team designed and developed a custom adaptor to assist service members who would otherwise not be able to use a PCA. Patient feedback of the device indicated a positive response, improved independence, and overall satisfaction during inpatient hospitalization. PMID:27483540

  20. Adding ketamine to morphine for intravenous patient-controlled analgesia for acute postoperative pain: a qualitative review of randomized trials

    DEFF Research Database (Denmark)

    Carstensen, M; Møller, A M

    2010-01-01

    -controlled analgesia (PCA) for postoperative pain in order to clarify this controversy. Our primary aim was to compare the effectiveness and safety of postoperative administered ketamine in addition to opioid for i.v. PCA compared with i.v. PCA with opioid alone. Studies were identified from the Cochrane Library 2003......In experimental trials, ketamine has been shown to reduce hyperalgesia, prevent opioid tolerance, and lower morphine consumption. Clinical trials have found contradictory results. We performed a review of randomized, double-blinded clinical trials of ketamine added to opioid in i.v. patient......, MEDLINE (1966-2009), and EMBASE (1980-2009) and by hand-searching reference lists from review articles and trials. Eleven studies were identified with a total of 887 patients. Quality and validity assessment was performed on all trials included using the Oxford Quality Scale with an average quality score...

  1. The evaluation of efficacy and safety of paravertebral block for perioperative analgesia in patients undergoing laparoscopic cholecystectomy

    Directory of Open Access Journals (Sweden)

    Anil Agarwal

    2012-01-01

    Full Text Available Background: Paravertebral block is a popular regional anesthetic technique used for perioperative analgesia in multiple surgical procedures. There are very few randomized trials of its use in laparoscopic cholecystectomy in medical literature. This study was aimed at assessing its efficacy and opioid-sparing potential in this surgery. Methods: Fifty patients were included in this prospective randomized study and allocated to two groups: Group A (25 patients receiving general anesthesia alone and Group B (25 patients receiving nerve-stimulator-guided bilateral thoracic Paravertebral Block (PVB at T6 level with 0.3 ml/kg of 0.25% bupivacaine prior to induction of general anesthesia. Intraoperative analgesia was supplemented with fentanyl (0.5 μg/kg based on hemodynamic and clinical parameters. Postoperatively, patients in both the groups received Patient-Controlled Analgesia (PCA morphine for the first 24 hours. The efficacy of PVB was assessed by comparing intraoperative fentanyl requirements, postoperative VAS scores at rest, and on coughing and PCA morphine consumption between the two groups. Results: Intraoperative supplemental fentanyl was significantly less in Group B compared to Group A (17.6 μg and 38.6 μg, respectively, P =0.001. PCA morphine requirement was significantly low in the PVB group at 2, 6, 12, and 24 hours postoperatively compared to that in Group A (4.4 mg vs 6.9 mg, 7.6 mg vs 14.2 mg, 11.6 mg vs 20.0 mg, 16.8 mg vs 27.2 mg, respectively; P <0.0001 at all intervals. Conclusion: Pre-induction PVB resulted in improved analgesia for 24 hours following laparoscopic cholecystectomy in this study, along with a significant reduction in perioperative opioid consumption and opioid-related side effects.

  2. Paediatric analgesia in an Emergency Department.

    LENUS (Irish Health Repository)

    Hawkes, C

    2012-02-03

    Timely management of pain in paediatric patients in the Emergency Department (ED) is a well-accepted performance indicator. We describe an audit of the provision of analgesia for children in an Irish ED and the introduction of a nurse-initiated analgesia protocol in an effort to improve performance. 95 children aged 1-16 presenting consecutively to the ED were included and time from triage to analgesia, and the rate of analgesia provision, were recorded. The results were circulated and a nurse initiated analgesia protocol was introduced. An audit including 145 patients followed this. 55.6% of patients with major fractures received analgesia after a median time of 54 minutes, which improved to 61.1% (p = 0.735) after 7 minutes (p = 0.004). Pain score documentation was very poor throughout, improving only slightly from 0% to 19.3%. No child had a documented pain score, which slightly improved to 19.3%. We recommend other Irish EDs to audit their provision of analgesia for children.

  3. Morphine for Intravenous Patient-Controlled Analgesia May Inhibit Delirium Tremens: A Case Report and Literature Review.

    Science.gov (United States)

    Chan, Chia-Ta; Liao, Wen-Wei; Huang, William

    2015-10-01

    Alcoholism is common among trauma patients and often lacks the appropriate monitoring. Alcohol withdrawal syndrome (AWS), including delirium tremens (DT), can be associated with significant postoperative morbidity and mortality. However, appropriate acute pain management may protect against delirium; the administration of intravenous patient-controlled analgesia (IV - PCA) may not only alleviate pain, but also reduce the incidence of post-operative delirium. IV-PCA is widely used today; however, little attention has been paid to its influence on the development of AWS or DT post-surgery. Here we present a case in which the administration of IV-PCA may have delayed the onset of DT that interfered with postoperative care and the initiation of psychiatric consultation. The literature was reviewed to determine the potential mechanisms behind the effects of IV-PCA on the onset of AWS or DT.IV-PCA may delay the onset of DT. It is imperative to take into consideration trauma patients' psychiatric history including answers to questions on alcoholism, so that when an IV-PCA is administered and then discontinued, adequate interventions to prevent further morbidity associated with AWS and DT can be initiated in sufficient time. PMID:26512587

  4. PCA-induced respiratory depression simulating stroke following endoluminal repair of abdominal aortic aneurysm: a case report

    Directory of Open Access Journals (Sweden)

    Ahmad Javed

    2007-07-01

    Full Text Available Abstract Aim To report a case of severe respiratory depression with PCA fentanyl use simulating stroke in a patient who underwent routine elective endoluminal graft repair for abdominal aortic aneurysm (AAA Case presentation A 78-year-old obese lady underwent routine endoluminal graft repair for AAA that was progressively increasing in size. Following an uneventful operation postoperative analgesia was managed with a patient-controlled analgesia (PCA device with fentanyl. On the morning following operation the patient was found to be unusually drowsy and unresponsive to stimuli. Her GCS level was 11 with plantars upgoing bilaterally. A provisional diagnosis of stroke was made. Urgent transfer to a high-dependency unit (HDU was arranged and she was given ventilatory support with a BiPap device. CT was performed and found to be normal. Arterial blood gas (ABG analysis showed respiratory acidosis with PaCO2 81 mmHg, PaO2 140 mmHg, pH 7.17 and base excess -2 mmol/l. A total dose of 600 mcg of fentanyl was self-administered in the 16 hours following emergence from general anaesthesia. Naloxone was given with good effect. There was an increase in the creatinine level from 90 μmol/L preoperatively to 167 μmol/L on the first postoperative day. The patient remained on BiPap for two days that resulted in marked improvement in gas exchange. Recovery was complete.

  5. The PCA replica experiment. Part 1

    International Nuclear Information System (INIS)

    Accurate calculation of radiation penetration through the side-shield of a pressurized water reactor (PWR) is important for the estimation of nuclear heating in the thermal shields and reactor pressure vessel (RPV), displacement-rates within the RPV, and neutron leakage into the void space between the RPV and the primary shield giving rise to activation of the material in the nozzle region. A zero-energy Pool Critical Assembly (PCA) mock-up was set up at Oak Ridge to validate standard US shielding codes. This experiment has been the subject of a so-called blind test of calculational methods in which eleven laboratories (including Winfrith) calculated the neutron spectra and reaction-rates at key locations. In order to obtain additional experimental data to clarify anomalies found in the PCA analysis and to validate techniques, the REPLICA experiment was carried in NESTOR at Winfrith. This report describes the experiment and gives results of the measurements and corresponding Monte Carlo predictions made with the McBEND Code. (U.K.)

  6. Intranasal sufentanil/ketamine analgesia in children

    DEFF Research Database (Denmark)

    Nielsen, Bettina Nygaard; Friis, Susanne M; Rømsing, Janne;

    2014-01-01

    The management of procedural pain in children ranges from physical restraint to pharmacological interventions. Pediatric formulations that permit accurate dosing, are accepted by children and a have a rapid onset of analgesia are lacking....

  7. The experience of labour with epidural analgesia

    DEFF Research Database (Denmark)

    Jepsen, Ingrid; Keller, Kurt Dauer

    2014-01-01

    important finding refers to the labouring woman’s relationship with the midwife, which represents an essential influencing factor on the woman’ experience of labour. Within this relationship, some rather unnoticed matters of communication and recognition appear to be of decisive significance. Conclusion...... birth. Findings: Initiation of epidural analgesia can have considerable implications for women’s experience of labour. Two different types of emotional reactions towards epidural analgesia are distinguished, one of which is particularly marked by a subtle sense of worry and ambivalence. Another......: After initiation of epidural analgesia the requirements of midwifery care seem to go beyond how women verbalise and define their own needs. The midwife should be attentive to the labouring woman’s type of emotional reaction to epidural analgesia and her possible intricate worries. 2014 Australian...

  8. Fast PCA via UTV decomposition and application on EEG analysis.

    Science.gov (United States)

    Wongsawat, Yodchanan

    2009-01-01

    In the mean square error sense, principal component analysis (PCA) or Karhunen-Loeve transform (KLT) can optimally summarize the high dimensional data into only a few meaningful ones. However, for the biomedical signal analysis, e.g. electroencephalogram (EEG), the data need to be updated or downdated very often. This fact makes the PCA impractical to be employed, especially in real-time signal analysis. In this paper, we propose the fast computational method for approximating the PCA such that the new transform, called fast PCA (fastPCA), can easily be updated and downdated. The fastPCA is calculated via the UTV decomposition which is the method normally used to approximate the rank-revealing property of the singular value decomposition (SVD). The merit of the fastPCA is also illustrated via the application on EEG analysis. PMID:19964138

  9. Analgesia and Sedation After Pediatric Cardiac Surgery

    OpenAIRE

    2010-01-01

    Abstract In recent years, the importance of appropriate intra-operative anesthesia and analgesia during cardiac surgery, has become recognised as a factor in postoperative recovery. This includes the early perioperative management of the neonate undergoing radical surgery and more recently the care surrounding fast track and ultra fast track surgery. However, outside these areas, relatively little attention has focused on postoperative sedation and analgesia within the pediatric in...

  10. Partial reinforcement, extinction, and placebo analgesia

    OpenAIRE

    Yeung, Siu Tsin Au; Colagiuri, Ben; Lovibond, Peter F.; Colloca, Luana

    2014-01-01

    Numerous studies indicate that placebo analgesia can be established via conditioning procedures. However, these studies have exclusively involved conditioning under continuous reinforcement. Thus, it is currently unknown whether placebo analgesia can be established under partial reinforcement and how durable any such effect would be. We tested this possibility using electro-cutaneous pain in healthy volunteers. Sixty undergraduates received placebo treatment (activation of a sham electrode) u...

  11. COMPARISON OF PATIENT-CONTROLLED ANALGESIA WITH TRAMADOL VS MORPHINE IN PATIENTS UNDERGOING ABDOMINAL GYNECOLOGICAL SURGERY

    Institute of Scientific and Technical Information of China (English)

    龚志毅; 叶铁虎; 于广祥; 秦小涛

    2003-01-01

    Objective. To compare the analgesic efficacy and adverse effects of patient-controlled analgesia (PCA) with tramadol and with morphine for postoperative middle or severe pain. Methods. Fifty-nine patients, scheduled for elective hysterectomy or hysteromyomectomy, were ran domly divided into Group T (tramadol-treated group) and Group M (morphine-treated group). The 2 drugs were administered intravenously via a patient-controlled analgesia device till 24 h postoperatively. Efficacy was assessed by comparing total pain relief (TOTPAR) and the sum of pain intensity difference (SPID) values over 24 h. Results. Statistically significant equivalence of tramadol and morphine was shown by TOTPAR values (15.9+4.4 and 16.4+3.5, respectively) and SPID values (9.2+4.7 and 9.0±2.0, respectively) (P>0.05). Tramadol caused fewer adverse events than morphine(16.7% and 26.7% of patients, respectively). Conclusion. The analgesic efficacy of PCA with tramadol and with morphine were equivalent in the treatment of postoperative pain, and tramadol can cause slighter gastrointestinal adverse effects.

  12. Spectral image reconstruction through the PCA transform

    Science.gov (United States)

    Ma, Long; Qiu, Xuewei; Cong, Yangming

    2015-12-01

    Digital color image reproduction based on spectral information has become a field of much interest and practical importance in recent years. The representation of color in digital form with multi-band images is not very accurate, hence the use of spectral image is justified. Reconstructing high-dimensional spectral reflectance images from relatively low-dimensional camera signals is generally an ill-posed problem. The aim of this study is to use the Principal component analysis (PCA) transform in spectral reflectance images reconstruction. The performance is evaluated by the mean, median and standard deviation of color difference values. The values of mean, median and standard deviation of root mean square (GFC) errors between the reconstructed and the actual spectral image were also calculated. Simulation experiments conducted on a six-channel camera system and on spectral test images show the performance of the suggested method.

  13. The novel prostate cancer antigen 3 (PCA3 biomarker

    Directory of Open Access Journals (Sweden)

    Andreas Bourdoumis

    2010-12-01

    Full Text Available PCA3 is a prostate specific, nonprotein coding RNA that is significantly over expressed in prostate cancer, without any correlation to prostatic volume and/or other prostatic diseases (e.g. prostatitis. It can now easily be measured in urine with a novel transcription-mediated amplification based test. Quantification of PCA3 mRNA levels can predict the outcome of prostatic biopsies with a higher specificity rate in comparison to PSA. Several studies have demonstrated that PCA3 can be used as a prognostic marker of prostate cancer, especially in conjunction with other predictive markers. Novel PCA3-based nomograms have already been introduced into clinical practice. PCA3 test may be of valuable help in several PSA quandary situations such as negative prostatic biopsies, concomitant prostatic diseases, and active surveillance. Results from relevant clinical studies, comparative with PSA, are warranted in order to confirm the perspective of PCA3 to substitute PSA.

  14. Beyond textbook neuroanatomy: The syndrome of malignant PCA infarction.

    Science.gov (United States)

    Gogela, Steven L; Gozal, Yair M; Rahme, Ralph; Zuccarello, Mario; Ringer, Andrew J

    2015-01-01

    Given its limited vascular territory, occlusion of the posterior cerebral artery (PCA) usually does not result in malignant infarction. Challenging this concept, we present 3 cases of unilateral PCA infarction with secondary malignant progression, resulting from extension into what would classically be considered the posterior middle cerebral artery (MCA) territory. Interestingly, these were true PCA infarctions, not "MCA plus" strokes, since the underlying occlusive lesion was in the PCA. We hypothesize that congenital and/or acquired variability in the distribution and extent of territory supplied by the PCA may underlie this rare clinical entity. Patients with a PCA infarction should thus be followed closely and offered early surgical decompression in the event of malignant progression. PMID:26337546

  15. PCA-Guided Routing Algorithm for Wireless Sensor Networks

    OpenAIRE

    Gong Chen; Liansheng Tan; Yanlin Gong; , Wei Zhang

    2012-01-01

    An important performance concern for wireless sensor networks (WSNs) is the total energy dissipated by all the nodes in the network over the course of network lifetime. In this paper, we propose a routing algorithm termed as PCA-guided routing algorithm (PCA-RA) by exploring the principal component analysis (PCA) approach. Our algorithm remarkably reduces energy consumption and prolongs network lifetime by realizing the objective of minimizing the sum of distances between the nodes and the cl...

  16. Remifentanil patient controlled analgesia versus epidural analgesia in labour. A multicentre randomized controlled trial

    Directory of Open Access Journals (Sweden)

    Freeman Liv M

    2012-07-01

    Full Text Available Abstract Background Pain relief during labour is a topic of major interest in the Netherlands. Epidural analgesia is considered to be the most effective method of pain relief and recommended as first choice. However its uptake by pregnant women is limited compared to other western countries, partly as a result of non-availability due to logistic problems. Remifentanil, a synthetic opioid, is very suitable for patient controlled analgesia. Recent studies show that epidural analgesia is superior to remifentanil patient controlled analgesia in terms of pain intensity score; however there was no difference in satisfaction with pain relief between both treatments. Methods/design The proposed study is a multicentre randomized controlled study that assesses the cost-effectiveness of remifentanil patient controlled analgesia compared to epidural analgesia. We hypothesize that remifentanil patient controlled analgesia is as effective in improving pain appreciation scores as epidural analgesia, with lower costs and easier achievement of 24 hours availability of pain relief for women in labour and efficient pain relief for those with a contraindication for epidural analgesia. Eligible women will be informed about the study and randomized before active labour has started. Women will be randomly allocated to a strategy based on epidural analgesia or on remifentanil patient controlled analgesia when they request pain relief during labour. Primary outcome is the pain appreciation score, i.e. satisfaction with pain relief. Secondary outcome parameters are costs, patient satisfaction, pain scores (pain-intensity, mode of delivery and maternal and neonatal side effects. The economic analysis will be performed from a short-term healthcare perspective. For both strategies the cost of perinatal care for mother and child, starting at the onset of labour and ending ten days after delivery, will be registered and compared. Discussion This study, considering cost

  17. Pain analgesia among adolescent self-injurers.

    Science.gov (United States)

    Glenn, Jeffrey J; Michel, Bethany D; Franklin, Joseph C; Hooley, Jill M; Nock, Matthew K

    2014-12-30

    Although non-suicidal self-injury (NSSI) involves self-inflicted physical harm, many self-injurers report feeling little or no pain during the act. Here we test: (1) whether the pain analgesia effects observed among adult self-injurers are also present among adolescents, and (2) three potential explanatory models proposing that habituation, dissociation, and/or self-criticism help explain the association between NSSI and pain analgesia among adolescents. Participants were 79 adolescents (12-19 years) recruited from the community who took part in a laboratory-based pain study. Results revealed that adolescent self-injurers have a higher pain threshold and greater pain endurance than non-injurers. Statistical mediation models revealed that the habituation and dissociation models were not supported; however, a self-critical style does mediate the association between NSSI and pain analgesia. The present findings extend earlier work by highlighting that a self-critical style may help to explain why self-injurers exhibit pain analgesia. Specifically, the tendency to experience self-critical thoughts in response to stressful events may represent a third variable that increases the likelihood of both NSSI and pain analgesia. Prospective experimental studies are needed to replicate and tease apart the direction of these associations, and may provide valuable leads in the development of effective treatments for this dangerous behavior problem. PMID:25172611

  18. SVD vs PCA: Comparison of Performance in an Imaging Spectrometer

    Directory of Open Access Journals (Sweden)

    Wilma Oblefias

    2004-12-01

    Full Text Available The calculation of basis spectra from a spectral library is an important prerequisite of any compact imaging spectrometer. In this paper, we compare the basis spectra computed by singular-value decomposition (SVD and principal component analysis (PCA in terms of estimation performance with respect to resolution, presence of noise, intensity variation, and quantization error. Results show that SVD is robust in intensity variation while PCA is not. However, PCA performs better with signals of low signal-to-noise ratio. No significant difference is seen between SVD and PCA in terms of resolution and quantization error.

  19. Effect of postoperative epidural analgesia on surgical outcome

    DEFF Research Database (Denmark)

    Holte, K; Holte, Kathrine

    2002-01-01

    Pain relief allowing sufficient mobilization after major surgical procedures can only be achieved by continuous epidural analgesia with local anesthetics, which also reduces the stress response to surgery. However, the role of postoperative epidural analgesia on postoperative morbidity is...

  20. PCA for predicting quaternary structure of protein

    Institute of Scientific and Technical Information of China (English)

    Tong WANG; Hongbin SHEN; Lixiu YAO; Jie YANG; Kuochen CHOU

    2008-01-01

    The number and arrangement of subunits that form a protein are referred to as quaternary structure. Knowing the quaternary structure of an uncharacterized protein provides clues to finding its biological function and interaction process with other molecules in a biological system. With the explosion of protein sequences generated in the Post-Genomic Age, it is vital to develop an automated method to deal with such a challenge. To explore this prob-lem, we adopted an approach based on the pseudo position-specific score matrix (Pse-PSSM) descriptor, proposed by Chou and Shen, representing a protein sample. The Pse-PSSM descriptor is advantageous in that it can combine the evolution information and sequence-correlated informa-tion. However, incorporating all these effects into a descriptor may cause 'high dimension disaster'. To over-come such a problem, the fusion approach was adopted by Chou and Shen. A completely different approach, linear dimensionality reduction algorithm principal component analysis (PCA) is introduced to extract key features from the high-dimensional Pse-PSSM space. The obtained dimension-reduced descriptor vector is a compact repre-sentation of the original high dimensional vector. The jack-knife test results indicate that the dimensionality reduction approach is efficient in coping with complicated problems in biological systems, such as predicting the quaternary struc-ture of proteins.

  1. Estudo comparativo dos bloqueios intercostal e interpleural para analgesia pós-operatória em colecistectomias abertas Estudio comparativo de los bloqueos intercostal e interpleural para analgesia pós-operatoria en colecistectomias abiertas Comparative study of intercostal and interpleural block for post-cholecystectomy analgesia

    Directory of Open Access Journals (Sweden)

    Antonio Mauro Vieira

    2003-06-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: A analgesia no pós-operatório é desejada pelos pacientes e tem sido praticada pela maioria dos anestesiologistas. Além dos opióides, os anestésicos locais têm sido utilizados nos bloqueios periféricos e centrais para se obter a analgesia pós-operatória. O objetivo deste estudo foi comparar duas técnicas de bloqueio dos nervos intercostais para analgesia pós-operatória em colecistectomias abertas. MÉTODO: Sessenta pacientes foram submetidos a colecistectomias abertas com incisão subcostal e receberam bloqueio intercostal (Grupo IC, n=30 ou bloqueio interpleural (Grupo IP, n=30, ambos com 100 mg de bupivacaína a 0,5% com adrenalina, para analgesia pós-operatória. Foram avaliados os tempos de analgesia e as queixas relatadas pelos pacientes. RESULTADOS: A qualidade da analgesia foi considerada boa para ambas as técnicas. A duração média de analgesia foi de 505 minutos no grupo IP e 620 minutos no grupo IC, não havendo diferença estatística entre eles. Náuseas, vômitos e dor abdominal leve foram as queixas pós-operatórias mais freqüentes. Não se constatou qualquer complicação pós-operatória associada exclusivamente aos bloqueios, assim como não foi evidenciado nenhum caso de pneumotórax. CONCLUSÕES: Concluiu-se que as técnicas promoveram analgesia satisfatória após colecistectomia, sendo que o bloqueio interpleural apresentou maior facilidade de execução.JUSTIFICATIVA Y OBJETIVOS: La analgesia en el pós-operatorio es deseada por los pacientes y ha sido practicada por la mayoría de los anestesiologistas. Además de los opioides, los anestésicos locales han sido utilizados en los bloqueos periféricos y centrales para obtenerse la analgesia pós-operatoria. El objetivo de este estudio fue comparar dos técnicas de bloqueo de los nervios intercostales para analgesia pós-operatoria en colecistectomias abiertas. MÉTODO: Sesenta pacientes fueron sometidos a colecistectomias

  2. Potentiation of morphine analgesia by caffeine.

    Science.gov (United States)

    Misra, A L; Pontani, R B; Vadlamani, N L

    1985-04-01

    Significant potentiation of morphine (5 mg kg-1 s.c. or 1 mg kg-1 i.v.) analgesia (tail-withdrawal reflex at 55 degrees C) was observed in caffeine-treated (100 mg kg-1 i.p.) rats as compared to the control group and lower doses of caffeine (2mg kg-1 i.p.) did not show this effect. Potentiated analgesia was reversed by naloxone. Pharmacokinetic or dispositional factors appear to be involved in part in this potentiation. PMID:4005485

  3. Potentiation of morphine analgesia by caffeine.

    OpenAIRE

    Misra, A. L.; Pontani, R. B.; Vadlamani, N. L.

    1985-01-01

    Significant potentiation of morphine (5 mg kg-1 s.c. or 1 mg kg-1 i.v.) analgesia (tail-withdrawal reflex at 55 degrees C) was observed in caffeine-treated (100 mg kg-1 i.p.) rats as compared to the control group and lower doses of caffeine (2mg kg-1 i.p.) did not show this effect. Potentiated analgesia was reversed by naloxone. Pharmacokinetic or dispositional factors appear to be involved in part in this potentiation.

  4. Nerve injury caused by mandibular block analgesia

    DEFF Research Database (Denmark)

    Hillerup, S; Jensen, Rigmor H

    2006-01-01

    : feather light touch, pinprick, sharp/dull discrimination, warm, cold, point location, brush stroke direction, 2-point discrimination and pain perception. Gustation was tested for recognition of sweet, salt, sour and bitter. Mandibular block analgesia causes lingual nerve injury more frequently than......Fifty-four injection injuries in 52 patients were caused by mandibular block analgesia affecting the lingual nerve (n=42) and/or the inferior alveolar nerve (n=12). All patients were examined with a standardized test of neurosensory functions. The perception of the following stimuli was assessed...

  5. Denoising by semi-supervised kernel PCA preimaging

    DEFF Research Database (Denmark)

    Hansen, Toke Jansen; Abrahamsen, Trine Julie; Hansen, Lars Kai

    2014-01-01

    Kernel Principal Component Analysis (PCA) has proven a powerful tool for nonlinear feature extraction, and is often applied as a pre-processing step for classification algorithms. In denoising applications Kernel PCA provides the basis for dimensionality reduction, prior to the so-called pre...... Amsterdam Library of Object Images (Geusebroek et al., 2005) [7]....

  6. Patient controlled analgesia with remifentanil versus epidural analgesia in labour: randomised multicentre equivalence trial

    OpenAIRE

    Freeman, Liv M; Bloemenkamp, Kitty W; Franssen, Maureen T; Papatsonis, Dimitri N; Hajenius, Petra J.; Hollmann, Markus W.; Woiski, Mallory D; Porath, Martina; Berg, Hans J. van den; van Beek, Erik; Borchert, Odette W H M; Schuitemaker, Nico; Sikkema, J Marko; Kuipers, A.H.M.; Logtenberg, Sabine L M

    2015-01-01

    OBJECTIVE: To determine women's satisfaction with pain relief using patient controlled analgesia with remifentanil compared with epidural analgesia during labour. DESIGN: Multicentre randomised controlled equivalence trial. SETTING: 15 hospitals in the Netherlands. PARTICIPANTS: Women with an intermediate to high obstetric risk with an intention to deliver vaginally. To exclude a clinically relevant difference in satisfaction with pain relief of more than 10%, we needed to include 1136 women....

  7. Analgesia pós-operatória Postoperative analgesia

    OpenAIRE

    Betina Sílvia Beozzo Bassanezi; Antonio Gonçalves Oliveira Filho

    2006-01-01

    JUSTIFICATIVAS E OBJETIVOS: A dor sempre foi uma das maiores preocupações do homem, entretanto, apesar dos progressos da ciência, ainda existem várias barreiras ao seu adequado tratamento, incluindo a falta de conhecimento por parte da equipe médica, sobre o mecanismo das diversas drogas e técnicas empregadas. O objetivo deste trabalho é abordar as principais drogas e técnicas empregadas no controle da dor pós-operatória, visando estimular o interesse sobre o assunto bem como aumentar a eficá...

  8. Stability and chaos of LMSER PCA learning algorithm

    International Nuclear Information System (INIS)

    LMSER PCA algorithm is a principal components analysis algorithm. It is used to extract principal components on-line from input data. The algorithm has both stability and chaotic dynamic behavior under some conditions. This paper studies the local stability of the LMSER PCA algorithm via a corresponding deterministic discrete time system. Conditions for local stability are derived. The paper also explores the chaotic behavior of this algorithm. It shows that the LMSER PCA algorithm can produce chaos. Waveform plots, Lyapunov exponents and bifurcation diagrams are presented to illustrate the existence of chaotic behavior of this algorithm

  9. PRINCIPAL COMPONENT ANALYSIS (PCA DAN APLIKASINYA DENGAN SPSS

    Directory of Open Access Journals (Sweden)

    Hermita Bus Umar

    2009-03-01

    Full Text Available PCA (Principal Component Analysis are statistical techniques applied to a single set of variables when the researcher is interested in discovering which variables in the setform coherent subset that are relativity independent of one another.Variables that are correlated with one another but largely independent of other subset of variables are combined into factors. The Coals of PCA to which each variables is explained by each dimension. Step in PCA include selecting and mean measuring a set of variables, preparing the correlation matrix, extracting a set offactors from the correlation matrixs. Rotating the factor to increase interpretabilitv and interpreting the result.

  10. Classification Accuracy of Neural Networks with PCA in Emotion Recognition

    Directory of Open Access Journals (Sweden)

    Novakovic Jasmina

    2011-04-01

    Full Text Available This paper presents classification accuracy of neural network with principal component analysis (PCA for feature selections in emotion recognition using facial expressions. Dimensionality reduction of a feature set is a common preprocessing step used for pattern recognition and classification applications. PCA is one of the popular methods used, and can be shown to be optimal using different optimality criteria. Experiment results, in which we achieved a recognition rate of approximately 85% when testing six emotions on benchmark image data set, show that neural networks with PCA is effective in emotion recognition using facial expressions.

  11. Acupuntura e analgesia: aplicações clínicas e principais acupontos Acupuncture and analgesia: clinical applications and main acupoints

    Directory of Open Access Journals (Sweden)

    Marilda Onghero Taffarel

    2009-12-01

    Full Text Available A dor é uma resposta protetora do organismo a estímulos nocivos, que resulta em efeitos indesejáveis quando não controlada. A analgesia pode ser promovida mediante a utilização de vários tipos de fármacos. No entanto, estes podem causar efeitos adversos de acordo com a espécie e condição física do paciente. A acupuntura tem se mostrado eficaz como coanalgésico pela capacidade de diminuir a quantidade de fármacos utilizados para o controle da dor e raramente ser contraindicada. Objetivou-se com este trabalho fazer uma breve revisão sobre as aplicações clínicas e os efeitos fisiológicos da acupuntura nos mecanismos da dor, bem como demonstrar os principais pontos de acupuntura utilizados para analgesia em animais. A pesquisa foi realizada em bases de dados eletrônicas por palavra-chave, durante o período de março a dezembro de 2008.Pain is a protective response of the body to harmful stimulus, which results in undesirable effects if not controlled. Analgesia can be achieved with the use of different types of drugs. However, these drugs can cause adverse effects according to species and patient physical condition. Acupuncture has been proved to be an effective analgesic adjuvant, by the capacity to decrease the amount of drug used for pain control, rarely contra-indicated. The aim of this paper was to review the physiological effects of acupuncture on pain mechanisms, and demonstrate the main acupoints used for animal analgesia. The search was done in electronic search database using key words, in 2008.

  12. Analgesia postoperatoria en la queiloplastia del lactante. Estudio comparativo: bloqueo infraorbitario intraoral bilateral con bupivacaína 0,25% con adrenalina vs. analgesia intravenosa con tramadol

    OpenAIRE

    Delgado, J. A.; A. Martínez-Tellería; Cano, M. E.; J. Galera; R. Fernández-Valades; A. Ruiz-Montes

    2005-01-01

    Objetivo: Comparar la eficacia y duración del bloqueo del nervio infraorbitario intraoral bilateral frente a la analgesia intravenosa convencional con tramadol en el control del dolor postoperatorio en lactantes sometidos a queiloplastia por labio leporino. Material y métodos: Tras la realización de una adecuada valoración preanestésica y la obtención del consentimiento informado de los padres, realizamos un estudio prospectivo, controlado aleatorizado y doble ciego en 25 niños, ASA I, con ed...

  13. Análise exploratória de adoçantes de mesa via espectroscopia no infravermelho (FTIR e análise por componentes principais (ACP Exploratory analysis of commercial sweeteners by infrared spectroscopy (FTIR and principal component analysis (PCA

    Directory of Open Access Journals (Sweden)

    Adriana Tozetto

    2007-12-01

    Full Text Available Nos últimos vinte anos, o consumo de alimentos diet e light tem aumentado sistematicamente, o que tem propiciado o constante desenvolvimento de produtos desse gênero. Grande ênfase tem sido dada àqueles produtos que substituem sacarose por edulcorantes de baixos conteúdos calóricos ou não calóricos. Seguindo esta tendência, adoçantes de mesa têm sido desenvolvidos variando-se amplamente o veículo e o tipo de edulcorante empregado. Neste trabalho, a análise de componentes principais associada à espectroscopia na região do infravermelho médio foi utilizada com sucesso para diferenciar os veículos empregados na produção destes adoçantes, sendo que esta metodologia quimiométrica reduziu o espaço dimensional para dois fatores, explicando cerca de 82-% da variância total dos dados. As variáveis responsáveis por esta discriminação estão localizadas na região da impressão digital do espectro de infravermelho (752,2 a 1284,5 cm-1. A análise exploratória mostrou-se útil para a visualização destes dados, gerando informações semiquantitativas para os adoçantes constituídos por lactose/aspartame, observações que seriam dificilmente visualizadas sem o recurso quimiométrico aplicado.In the last twenty years, the consumption of diet and light foods has grown steadily, leading to the constant development of such products. Much emphasis has been placed on products that replace sucrose with sweeteners of low or zero calorie content. The development of new commercial sweeteners illustrates this tendency. In this work, principal component analysis and infrared spectroscopy were used to successfully differentiate the vehicles (mediums employed in the production of sweeteners. This chemometric methodology reduced the dimensional space to two factors, accounting for 82% of the total variance of the data. The variables responsible for this discrimination were localized in the fingerprint region of the infrared spectrum (752.2 to

  14. Palmprint Recognition by Applying Wavelet-Based Kernel PCA

    Institute of Scientific and Technical Information of China (English)

    Murat Ekinci; Murat Aykut

    2008-01-01

    This paper presents a wavelet-based kernel Principal Component Analysis (PCA) method by integrating the Daubechies wavelet representation of palm images and the kernel PCA method for palmprint recognition. Kernel PCA is a technique for nonlinear dimension reduction of data with an underlying nonlinear spatial structure. The intensity values of the palmprint image are first normalized by using mean and standard deviation. The palmprint is then transformed into the wavelet domain to decompose palm images and the lowest resolution subband coefficients are chosen for palm representation.The kernel PCA method is then applied to extract non-linear features from the subband coefficients. Finally, similarity measurement is accomplished by using weighted Euclidean linear distance-based nearest neighbor classifier. Experimental results on PolyU Palmprint Databases demonstrate that the proposed approach achieves highly competitive performance with respect to the published palmprint recognition approaches.

  15. Two-Stage PCA Extracts Spatiotemporal Features for Gait Recognition

    Directory of Open Access Journals (Sweden)

    Sandhitsu R. Das

    2006-08-01

    Full Text Available We propose a technique for gait recognition from motion capture data based on two successive stages of principal component analysis (PCA on kinematic data. The first stage of PCA provides a low dimensional representation of gait. Components of this representation closely correspond to particular spatiotemporal features of gait that we have shown to be important for visual recognition of gait in a separate psychophysical study. A second stage of PCA captures the shape of the trajectory within the low dimensional space during a given gait cycle across different individuals or gaits. The projection space of the second stage of PCA has distinguishable clusters corresponding to the individual identity and type of gait. Despite the simple eigen-analysis based approach, promising recognition performance is obtained.

  16. Classification Accuracy of Neural Networks with PCA in Emotion Recognition

    OpenAIRE

    Novakovic Jasmina; Minic Milomir; Veljovic Alempije

    2011-01-01

    This paper presents classification accuracy of neural network with principal component analysis (PCA) for feature selections in emotion recognition using facial expressions. Dimensionality reduction of a feature set is a common preprocessing step used for pattern recognition and classification applications. PCA is one of the popular methods used, and can be shown to be optimal using different optimality criteria. Experiment results, in which we achieved a recognition rate of approximately 85%...

  17. PCA/LDA Approach for Text-Independent Speaker Recognition

    OpenAIRE

    Ge, Zhenhao; Sharma, Sudhendu R.; Smith, Mark J.T.

    2016-01-01

    Various algorithms for text-independent speaker recognition have been developed through the decades, aiming to improve both accuracy and e?ciency. This paper presents a novel PCA/LDA-based approach that is faster than traditional statistical model-based methods and achieves competitive results. First, the performance based on only PCA and only LDA is measured; then a mixed model, taking advantages of both methods, is introduced. A subset of the TIMIT corpus composed of 200 male speakers, is u...

  18. Nefopam analgesia and its role in multimodal analgesia: A review of preclinical and clinical studies.

    Science.gov (United States)

    Girard, Philippe; Chauvin, Marcel; Verleye, Marc

    2016-01-01

    Nefopam is a non-opioid, non-steroidal, centrally acting analgesic drug used to prevent postoperative pain, primarily in the context of multimodal analgesia. This paper reviews preclinical and clinical studies in which nefopam has been combined with opioids, non-steroidal anti-inflammatory compounds, and paracetamol. This report focuses on the literature during the last decade and discusses the translational efforts between animal and clinical studies in the context of multimodal or balanced analgesia. In preclinical rodent models of acute and inflammatory pain, nefopam combinations including opioids revealed a synergistic interaction or enhanced morphine analgesia in six out of seven studies. Nefopam combinations including non-steroidal anti-inflammatory drugs (NSAIDs) (aspirin, ketoprofen or nimesulide) or paracetamol likewise showed enhanced analgesic effects for the associated compound in all instances. Clinical studies have been performed in various types of surgeries involving different pain intensities. Nefopam combinations including opioids resulted in a reduction in morphine consumption in 8 out of 10 studies of severe or moderate pain. Nefopam combinations including NSAIDs (ketoprofen or tenoxicam) or paracetamol also demonstrated a synergic interaction or an enhancement of the analgesic effect of the associated compound. In conclusion, this review of nefopam combinations including various analgesic drugs (opioids, NSAIDs and paracetamol) reveals that enhanced analgesia was demonstrated in most preclinical and clinical studies, suggesting a role for nefopam in multimodal analgesia based on its distinct characteristics as an analgesic. Further clinical studies are needed to evaluate the analgesic effects of nefopam combinations including NSAIDs or paracetamol. PMID:26475417

  19. Wound catheter techniques for postoperative analgesia

    OpenAIRE

    VINTAR, NELI

    2009-01-01

    Wound catheter technique is a technique of postoperative analgesia in which the surgeon places a catheter to infuse local anesthetic into wounds at the end of the procedure. It can be used in abdominal colorectal surgery or after holecystectomies, was studied after caesarean delivery. It was effective after some orthopaedic procedures such as shoulder and knee surgery, at the donor site in the iliac crest. It can be used in plastic surgery after breast surgery. It is technically efficie...

  20. Continuous subcutaneous pethidine for routine postoperative analgesia.

    OpenAIRE

    Davenport, H T; Al-Khudairi, D.; Cox, P. N.; Wright, B. M.

    1985-01-01

    We consider that the present state of postoperative analgesia is unsatisfactory because drugs are given intermittently and usually only at the patients' request and with nurses' acquiescence. A procedure for routine continuous pethidine infusion, suitable for administration and control by the nursing staff is described. The results of a trial on patients after major surgery are summarised. We believe the procedure to be more efficient and effective than those presently in use.

  1. [Labor analgesia in the US and Japan].

    Science.gov (United States)

    Morishima, Hisayo O

    2007-09-01

    Obstetric anesthesia has made significant progress over the last 50 years. It is one of the major subspecialties in anesthesia in US. Society for Obstetric Anesthesia and Perinatology (SOAP) was founded in 1968. According to its SCORE project on the practice of obstetric anesthesia, 82.4% of all parturients received some form of anesthesia for cesarean section or labor analgesia. Epidural analgesia was the most common form of labor analgesia (65%), followed by CSEA. This high percentage of anesthesia care for parturients mandates the presence of obstetric anesthesiologists at labor and delivery suites in major hospitals in US. The Japanese Society of Obstetrics and Anesthesia, formerly "Mutsu-bunben Kenkyukai", now called "Bunben to Masui Kenkyukai", was founded in Japan at about the same time as SOAP. Despite its long history, obstetric anesthesia is yet to be a major subspecialty in Japan. It is encouraging, however, that the number of attendants in obstetric anesthesia sessions in JSA seems increasing. SOAP has played an important role in the education and progress of obstetric anesthesia in US. I hope that the joint symposium of SOAP, Bunben to Masui Kenkyukai, and JSA at 39th SOAP annual meeting will facilitate the progress of obstetric anesthesia in Japan. PMID:17877044

  2. Intrathecal analgesia and palliative care: A case study

    Directory of Open Access Journals (Sweden)

    Naveen S Salins

    2010-01-01

    Full Text Available Intrathecal analgesia is an interventional form of pain relief with definite advantages and multiple complications. Administration of intrathecal analgesia needs a good resource setting and expertise. Early complications of intrathecal analgesia can be very distressing and managing these complications will need a high degree of knowledge, technical expertise and level of experience. Pain control alone cannot be the marker of quality in palliative care. A holistic approach may need to be employed that is more person and family oriented.

  3. Selective REM Sleep Deprivation Improves Expectation-Related Placebo Analgesia.

    Directory of Open Access Journals (Sweden)

    Florian Chouchou

    Full Text Available The placebo effect is a neurobiological and psychophysiological process known to influence perceived pain relief. Optimization of placebo analgesia may contribute to the clinical efficacy and effectiveness of medication for acute and chronic pain management. We know that the placebo effect operates through two main mechanisms, expectations and learning, which is also influenced by sleep. Moreover, a recent study suggested that rapid eye movement (REM sleep is associated with modulation of expectation-mediated placebo analgesia. We examined placebo analgesia following pharmacological REM sleep deprivation and we tested the hypothesis that relief expectations and placebo analgesia would be improved by experimental REM sleep deprivation in healthy volunteers. Following an adaptive night in a sleep laboratory, 26 healthy volunteers underwent classical experimental placebo analgesic conditioning in the evening combined with pharmacological REM sleep deprivation (clonidine: 13 volunteers or inert control pill: 13 volunteers. Medication was administered in a double-blind manner at bedtime, and placebo analgesia was tested in the morning. Results revealed that 1 placebo analgesia improved with REM sleep deprivation; 2 pain relief expectations did not differ between REM sleep deprivation and control groups; and 3 REM sleep moderated the relationship between pain relief expectations and placebo analgesia. These results support the putative role of REM sleep in modulating placebo analgesia. The mechanisms involved in these improvements in placebo analgesia and pain relief following selective REM sleep deprivation should be further investigated.

  4. LABOUR ANALGESIA: EPIDURAL DEXMEDITOMIDINE WITH EITHER BUPIVACAINE OR ROPIVACAINE

    Directory of Open Access Journals (Sweden)

    Varaprasad

    2015-07-01

    Full Text Available BACKGROUND: Pain relief in labour is associated with myths and controversies. Providing effective and safe analgesia has remained a challenge. AIM: The purpose of the study was to compare the effect of analgesia with epidural bupivacain or ropivacain along with dexme ditomidine. METHODS AND MATERIAL: Sixty parturients of ASA grade I and II were randomly selected for the study. Each group consisted of thirty patients. The analgesia, motor loss and level of sedation were studied. RESULTS: There was no significant differ ence between the two groups in maternal satisfaction, analgesia and neonatal outcome .

  5. Comparação de morfina administrada por via intravenosa e via epidural com/sem bupivacaína ou ropivacaína no tratamento da dor pós-toracotomia com a técnica de analgesia controlada pelo paciente Comparación de la morfina administrada por vía intravenosa y vía epidural con /sin bupivacaína o ropivacaína en el tratamiento del dolor pos toracotomía con la técnica de analgesia controlada por el paciente Comparison of intravenous morphine, epidural morphine with/without bupivacaine or ropivacaine in postthoracotomy pain management with patient controlled analgesia technique

    Directory of Open Access Journals (Sweden)

    Esra Mercanoğlu

    2013-04-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: O objetivo deste estudo randomizado, duplo-cego e prospectivo foi determinar a eficácia e os efeitos colaterais da administração por via intravenosa ou epidural de morfina, bupivacaína ou ropivacaína no tratamento da dor pós-toracotomia. MÉTODOS: Sessenta pacientes submetidos a procedimentos de toracotomia eletiva foram randomicamente alocados em quatro grupos com o uso da técnica de envelopes lacrados. Os grupos MIV, ME, MEB e MER receberam morfina controlada pelo paciente por via intravenosa, e morfina, morfina-bupivacaína e morfina- ropivacaína epidural, respectivamente. Frequência cardíaca, pressão arterial e saturação de oxigênio perioperatórias e dor pós-operatória em repouso e durante a tosse, efeitos colaterais e necessidade de analgésicos de resgate foram registrados aos 30 e 60 minutos e em duas, quatro, seis, 12, 24, 36, 48 e 72 horas. RESULTADOS: A necessidade de sódio diclofenaco durante o estudo foi menor no grupo ME. A área sob a curva de tempo na VAS foi menor no grupo ME em comparação com o Grupo MIV, mas similar aos Grupos MEB e MER. Os escores de dor em repouso foram maiores nos tempos 12, 24, 36 e 48 horas no Grupo MIV em comparação com o Grupo ME. Os escores de dor em repouso foram maiores aos 30 e 60 minutos nos Grupos ME e MIV em comparação com o Grupo MEB. Os escores de dor durante a tosse aos 30 minutos foram maiores no grupo ME em comparação com o Grupo MEB. Não houve diferença entre os Grupos MIV e MER. CONCLUSÕES: Morfina administrada por via epidural foi mais eficaz do que por via intravenosa. A eficácia foi maior no grupo EM no período pós-operatório tardio e no Grupo MEB no período pós-operatório inicial. Concluímos que morfina administrada por via epidural foi a mais eficaz e preferida.JUSTIFICATIVA Y OBJETIVOS: El objetivo de este estudio aleatorio, doble ciego y prospectivo fue determinar la eficacia y los efectos colaterales de la administraci

  6. Patient-controlled oral analgesia versus nurse-controlled parenteral analgesia after caesarean section: a randomised controlled trial.

    Science.gov (United States)

    Bonnal, A; Dehon, A; Nagot, N; Macioce, V; Nogue, E; Morau, E

    2016-05-01

    We assessed the effectiveness of early patient-controlled oral analgesia compared with parenteral analgesia in a randomised controlled non-inferiority trial of women undergoing elective caesarean section under regional anaesthesia. Seventy-seven women received multimodal paracetamol, ketoprofen and morphine analgesia. The woman having patient-controlled oral analgesia were administered four pillboxes on the postnatal ward containing tablets and instructions for self-medication, the first at 7 h after the spinal injection and then three more at 12-hourly intervals. Pain at rest and on movement was evaluated using an 11-point verbal rating scale at 2 h and then at 6-hourly intervals for 48 h. The pre-defined non-inferiority limit for the difference in mean pain scores (patient-controlled oral analgesia minus parenteral) was one. The one-sided 95% CI of the difference in mean pain scores was significantly lower than one at all time-points at rest and on movement, demonstrating non-inferiority of patient-controlled oral analgesia. More women used morphine in the patient-controlled oral analgesia group (22 (58%)) than in the parenteral group (9 (23%); p = 0.002). The median (IQR [range]) number of morphine doses in the patient-controlled oral analgesia group was 2 (1-3 [1-7]) compared with 1 (1-1 [1-2]); p = 0.006) in the parenteral group. Minor drug errors or omissions were identified in five (13%) women receiving patient-controlled oral analgesia. Pruritus was more frequent in the patient-controlled oral analgesia group (14 (37%) vs 6 (15%) respectively; p = 0.03), but no differences were noted for other adverse events and maternal satisfaction. After elective caesarean section, early patient-controlled oral analgesia is non-inferior to standard parenteral analgesia for pain management, and can be one of the steps of an enhanced recovery process. PMID:26931110

  7. Analgesia postoperatoria en la queiloplastia del lactante. Estudio comparativo: bloqueo infraorbitario intraoral bilateral con bupivacaína 0,25% con adrenalina vs. analgesia intravenosa con tramadol

    Directory of Open Access Journals (Sweden)

    J. A. Delgado

    2005-05-01

    Full Text Available Objetivo: Comparar la eficacia y duración del bloqueo del nervio infraorbitario intraoral bilateral frente a la analgesia intravenosa convencional con tramadol en el control del dolor postoperatorio en lactantes sometidos a queiloplastia por labio leporino. Material y métodos: Tras la realización de una adecuada valoración preanestésica y la obtención del consentimiento informado de los padres, realizamos un estudio prospectivo, controlado aleatorizado y doble ciego en 25 niños, ASA I, con edades comprendidas entre los 3-10 meses, tras obtener el consentimiento informado de los padres, propuestos para cirugía correctora de labio leporino (queiloplastia. Todos ellos fueron premeditados, media hora antes de la intervención quirúrgica, con midazolan oral (0,5 mg.kg-1 y, en todos los casos, se practicó la técnica anestésica y el bloqueo nervioso por el mismo anestesiólogo, que consistió en una inducción inhalatoria con sevoflurano previa a la venoclisis. La anestesia general se completó con atropina, fentanilo y rocuronio a las dosis establecidas que se administraron, por vía intravenosa, previamente a la intubación endotraqueal y la ventilación mecánica. Los pacientes fueron divididos aleatoriamente en dos grupos: Grupo A (n = 12: se administró 1-2 ml de bupivacaína al 0,25% con adrenalina para el bloqueo infraorbitario bilateral y solución salina intravenosa como sustitutivo de la analgesia intravenosa con tramadol. Grupo B (n = 13: se administró solución salina para el bloqueo nervioso, en lugar de la bupivacaína, y tramadol intravenoso (1,5 mg.kg-1 como analgesia postoperatoria. En todos ellos se realizó anestesia general con sevoflurano y fentanilo "a demanda" según parámetros convencionales (tensión arterial, frecuencia cardiaca, tamaño pupilar, etc.. Durante sus primeras seis horas de estancia en Reanimación se valoró la duración de la analgesia, grado de disconfort e intensidad dolorosa. Además se anot

  8. Epidural analgesia in labor: specific characteristics, dilemmas and controversies

    Directory of Open Access Journals (Sweden)

    Kutlešić Marija

    2012-01-01

    Full Text Available Introduction. Epidural analgesia has become the most popular method for labor pain relief. Analgesia in Labor: Yes or No? Labor pain is a complex phenomenon with sensory, cognitive, motivational, emotional, social, and cultural variables. Pain and anxiety lead to adrenergic hyperactivity, hyperventilation, hypocapnia with reduced uteroplacental blood flow and uncoordinated uterine activity, so pain relief is recommended and even indicated in cases of maternal comorbidity. Analgesia in Labor: Method of Choice. The quality of epidural analgesia is better than the one achieved by parenteral or inhalation agents, with increased uteroplacental blood flow and improved fetal-maternal oxygenation. Epidural Analgesia in Labor: What is Specific? The increased weight, lumbar lordosis, soft tissue edema and engorgement of epidural veins make it more difficult to perform epidural block in pregnancy. Epidural puncture should be performed by medial approach, at L2 - 3 or L3 - 4 level by loss of resistance technique between contractions. Epidural Analgesia in Labor: What With? Local anesthetics, bupivacaine, levobupivacaine, ropivacaine, are used and they can be combined with small doses of opioids (fentanyl or sufentanyl. Epidural Analgesia in Labor: How? Available techniques are epidural, spinal and combined spinal - epidural analgesia. Epidural Analgesia in Labor: Controversies. The most important controversy is the influence of epidural analgesia on operative or instrumental delivery rate. Low concentrations of local anesthetic in combination with small doses of opioids, together with active management of labor by an obstetrician, would lead to increased spontaneous delivery rate. Conclusion. Although there still are some difficulties, complications and controversies, epidural analgesia provides safe and effective labor pain control.

  9. La analgesia epidural en el parto. Aspectos prácticos.

    Directory of Open Access Journals (Sweden)

    Miguel Picot Castro

    2012-08-01

    Full Text Available Es mucha la literatura científica relacionada con la analgesia epidural (AE durante el trabajo de parto. La mayor parte dirigida a estudiar consecuencias, efectos secundarios o complicaciones de su uso. El objetivo de esta revisión es ofrecer una visión actualizada de la bibliografía centrándonos en aquellos aspectos prácticos que podrían suponer cambios en las actuaciones diarias de las matronas basados en el conocimiento científico.Objetivo principal: El objetivo de esta revisión es ofrecer una visión actualizada de la evidencia científica, centrándonos en aquellos aspectos prácticos que podrían suponer cambios en las actuaciones diarias de las matronas Metodología: Se ha llevado a cabo la revisión consultando las siguientes bases de datos biomédicas: Cuiden, PubMed y Cochrane.Resultados principales: Se detallan a continuación prácticas habituales llevadas a cabo por las matronas no avaladas por la evidencia científica y se describen las prácticas más recomendables en relación con el uso de la analgesia epidural durante el trabajo de parto.Conclusión principal: El conocimiento por parte de la matrona de la evidencia científica en relación al uso de analgesia epidural durante el trabajo de parto, puede disminuir el número de intervenciones innecesarias así como la aparición de complicaciones tanto maternas como fetales.

  10. Post operatory analgesia in caesarean surgery. Analgesia posoperatoria en la operación cesárea.

    Directory of Open Access Journals (Sweden)

    María Antonia Cabezas Poblet

    2003-12-01

    >Fundamento: El dolor posoperatorio constituye un problema muy difundido y constante en los cuidados del paciente quirúrgico. La lucha por encontrar nuevas terapéuticas para aliviar el dolor ha llevado a la fabricación y uso de gran variedad de analgésicos que son administrados por diferentes vías. Se conocen bien los efectos de los narcóticos en el recién nacido y fue la preocupación al respecto lo que motivó el interés por el uso de esos fármacos por vía epidural e intratecal en la paciente obstétrica. Objetivo: Evaluar la factibilidad del uso de morfina liofilizada por vía peridural en la operación cesárea. Métodos : Estudio de serie de casos desarrollado durante el periodo comprendido entre febrero del 2001 a agosto del 2002 en la unidad quirúrgica del Servicio de Ginecoobstetricia del Hospital Universitario ¨Dr.Gustavo Aldereguía Lima¨ de Cienfuegos, que incluyó 120 pacientes sometidas a cesárea iterativa electiva. Se analizaron variables correspondientes a tensión arterial, frecuencia cardiaca, frecuencia respiratoria durante el preoperatorio, transoperatorio y posoperatorio, comienzo del efecto anestésico y duración de este, además se analizaron las complicaciones perioperatorias, la calidad de la analgesia posoperatoria y su repercusión en el recién nacido, medida mediante el puntaje de Apgar. El procesamiento estadístico se realizó utilizando el paquete estadístico Epi Info 6. Resultados : El comienzo del efecto anestésico y el tiempo de duración de la anestesia no se modificaron con el uso de la morfina liofilizada. Los parámetros vitales se mantuvieron con valores normales en la mayoría de las pacientes durante el preoperatorio, transoperatorio y posoperatorio. Las complicaciones que se presentaron fueron: prurito, retención urinaria, náuseas y vómitos. La calidad de la analgesia resultó satisfactoria en la mayoría de las pacientes. Los valores de Apgar fueron normales en todos

  11. Identification of the isomers using principal component analysis (PCA) method

    Science.gov (United States)

    Kepceoǧlu, Abdullah; Gündoǧdu, Yasemin; Ledingham, Kenneth William David; Kilic, Hamdi Sukur

    2016-03-01

    In this work, we have carried out a detailed statistical analysis for experimental data of mass spectra from xylene isomers. Principle Component Analysis (PCA) was used to identify the isomers which cannot be distinguished using conventional statistical methods for interpretation of their mass spectra. Experiments have been carried out using a linear TOF-MS coupled to a femtosecond laser system as an energy source for the ionisation processes. We have performed experiments and collected data which has been analysed and interpreted using PCA as a multivariate analysis of these spectra. This demonstrates the strength of the method to get an insight for distinguishing the isomers which cannot be identified using conventional mass analysis obtained through dissociative ionisation processes on these molecules. The PCA results dependending on the laser pulse energy and the background pressure in the spectrometers have been presented in this work.

  12. Robust PCA as Bilinear Decomposition with Outlier-Sparsity Regularization

    CERN Document Server

    Mateos, Gonzalo

    2011-01-01

    Principal component analysis (PCA) is widely used for dimensionality reduction, with well-documented merits in various applications involving high-dimensional data, including computer vision, preference measurement, and bioinformatics. In this context, the fresh look advocated here permeates benefits from variable selection and compressive sampling, to robustify PCA against outliers. A least-trimmed squares estimator of a low-rank bilinear factor analysis model is shown closely related to that obtained from an $\\ell_0$-(pseudo)norm-regularized criterion encouraging sparsity in a matrix explicitly modeling the outliers. This connection suggests robust PCA schemes based on convex relaxation, which lead naturally to a family of robust estimators encompassing Huber's optimal M-class as a special case. Outliers are identified by tuning a regularization parameter, which amounts to controlling sparsity of the outlier matrix along the whole robustification path of (group) least-absolute shrinkage and selection operat...

  13. On a PCA-based lung motion model

    Science.gov (United States)

    Li, Ruijiang; Lewis, John H.; Jia, Xun; Zhao, Tianyu; Liu, Weifeng; Wuenschel, Sara; Lamb, James; Yang, Deshan; Low, Daniel A.; Jiang, Steve B.

    2011-09-01

    Respiration-induced organ motion is one of the major uncertainties in lung cancer radiotherapy and is crucial to be able to accurately model the lung motion. Most work so far has focused on the study of the motion of a single point (usually the tumor center of mass), and much less work has been done to model the motion of the entire lung. Inspired by the work of Zhang et al (2007 Med. Phys. 34 4772-81), we believe that the spatiotemporal relationship of the entire lung motion can be accurately modeled based on principle component analysis (PCA) and then a sparse subset of the entire lung, such as an implanted marker, can be used to drive the motion of the entire lung (including the tumor). The goal of this work is twofold. First, we aim to understand the underlying reason why PCA is effective for modeling lung motion and find the optimal number of PCA coefficients for accurate lung motion modeling. We attempt to address the above important problems both in a theoretical framework and in the context of real clinical data. Second, we propose a new method to derive the entire lung motion using a single internal marker based on the PCA model. The main results of this work are as follows. We derived an important property which reveals the implicit regularization imposed by the PCA model. We then studied the model using two mathematical respiratory phantoms and 11 clinical 4DCT scans for eight lung cancer patients. For the mathematical phantoms with cosine and an even power (2n) of cosine motion, we proved that 2 and 2n PCA coefficients and eigenvectors will completely represent the lung motion, respectively. Moreover, for the cosine phantom, we derived the equivalence conditions for the PCA motion model and the physiological 5D lung motion model (Low et al 2005 Int. J. Radiat. Oncol. Biol. Phys. 63 921-9). For the clinical 4DCT data, we demonstrated the modeling power and generalization performance of the PCA model. The average 3D modeling error using PCA was within 1

  14. On a PCA-based lung motion model

    Energy Technology Data Exchange (ETDEWEB)

    Li Ruijiang; Lewis, John H; Jia Xun; Jiang, Steve B [Department of Radiation Oncology and Center for Advanced Radiotherapy Technologies, University of California San Diego, 3855 Health Sciences Dr, La Jolla, CA 92037-0843 (United States); Zhao Tianyu; Wuenschel, Sara; Lamb, James; Yang Deshan; Low, Daniel A [Department of Radiation Oncology, Washington University School of Medicine, 4921 Parkview Pl, St. Louis, MO 63110-1093 (United States); Liu Weifeng, E-mail: sbjiang@ucsd.edu [Amazon.com Inc., 701 5th Ave. Seattle, WA 98104 (United States)

    2011-09-21

    Respiration-induced organ motion is one of the major uncertainties in lung cancer radiotherapy and is crucial to be able to accurately model the lung motion. Most work so far has focused on the study of the motion of a single point (usually the tumor center of mass), and much less work has been done to model the motion of the entire lung. Inspired by the work of Zhang et al (2007 Med. Phys. 34 4772-81), we believe that the spatiotemporal relationship of the entire lung motion can be accurately modeled based on principle component analysis (PCA) and then a sparse subset of the entire lung, such as an implanted marker, can be used to drive the motion of the entire lung (including the tumor). The goal of this work is twofold. First, we aim to understand the underlying reason why PCA is effective for modeling lung motion and find the optimal number of PCA coefficients for accurate lung motion modeling. We attempt to address the above important problems both in a theoretical framework and in the context of real clinical data. Second, we propose a new method to derive the entire lung motion using a single internal marker based on the PCA model. The main results of this work are as follows. We derived an important property which reveals the implicit regularization imposed by the PCA model. We then studied the model using two mathematical respiratory phantoms and 11 clinical 4DCT scans for eight lung cancer patients. For the mathematical phantoms with cosine and an even power (2n) of cosine motion, we proved that 2 and 2n PCA coefficients and eigenvectors will completely represent the lung motion, respectively. Moreover, for the cosine phantom, we derived the equivalence conditions for the PCA motion model and the physiological 5D lung motion model (Low et al 2005 Int. J. Radiat. Oncol. Biol. Phys. 63 921-9). For the clinical 4DCT data, we demonstrated the modeling power and generalization performance of the PCA model. The average 3D modeling error using PCA was within 1

  15. Multivariate analysis in dam monitoring data with PCA

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    Given the limitation of traditional univariate analysis method in processing the multicollinearity of dam monitoring data,this paper reconstructs the multivariate response variables by introducing principal component analysis(PCA) method,explores the ways of determining principal components(PCs),and extracts a few PCs that have major influence on data variance.For steady observation series,a control field for the whole observation values has been established based upon PCA;for unsteady observation series that have significant tendency,a control field for the future observation values has been constructed according to PC statistical predication model.These methods have already been applied to an actual project and the results showed that data interpretation method with PCA can not only realize data reduction,lower data redundancy,and reduce noise and false alarm rate,but also be effective to data analysis,having a broad application prospect.

  16. Analgesia postoperatoria en la queiloplastia del lactante. Estudio comparativo: bloqueo infraorbitario intraoral bilateral con bupivacaína 0,25% con adrenalina vs. analgesia intravenosa con tramadol Postoperative analgesia for the management of chieloplasty in the breast-fed baby. Comparative study: bilateral intraoral blockade of the infraorbitary nerve with bupivacaine 0.25% plus adrenaline versus intravenous analgesia with tramadol

    OpenAIRE

    Delgado, J. A.; A. Martínez-Tellería; Cano, M. E.; J. Galera; R. Fernández-Valades; A. Ruiz-Montes

    2005-01-01

    Objetivo: Comparar la eficacia y duración del bloqueo del nervio infraorbitario intraoral bilateral frente a la analgesia intravenosa convencional con tramadol en el control del dolor postoperatorio en lactantes sometidos a queiloplastia por labio leporino. Material y métodos: Tras la realización de una adecuada valoración preanestésica y la obtención del consentimiento informado de los padres, realizamos un estudio prospectivo, controlado aleatorizado y doble ciego en 25 niños, ASA I, con ed...

  17. Technology Marketing using PCA , SOM, and STP Strategy Modeling

    Directory of Open Access Journals (Sweden)

    Sunghae Jun

    2011-01-01

    Full Text Available Technology marketing is a total processing about identifying and meeting the technological needs of human society. Most technology results exist in intellectual properties like patents. In our research, we consider patent document as a technology. So patent data are analyzed by Principal Component Analysis (PCA and Self Organizing Map (SOM for STP(Segmentation, Targeting, and Positioning strategy modeling. STP is a popular approach for developing marketing strategies. We use STP strategy modeling for technology marketing. Also PCA and SOM are used to analyze patent data in STP modeling. To verify improved performance of our study, we make experiments using patent data from USPTO.

  18. A novel image fusion method using WBCT and PCA

    Institute of Scientific and Technical Information of China (English)

    Qiguang Miao; Baoshu Wang

    2008-01-01

    A novel image fusion algorithm based on wavelet-based contourlet transform (WBCT)and principal component analysis(PCA)is proposed.The PCA method is adopted for the low-frequency components.Using the proposed algorithm to choose the greater of the active measures,the region consistency test is performed for the high-frequency components.Experiments show that the proposed method works better in preserving the edge and texture information than wavelet transform method and Laplacian pyramid (LP)method do in image fusion.Four indicators for the fusion image are given to compare the proposed method with other methods.

  19. Performance Evaluation of BPM System in SSRF Using PCA Method

    CERN Document Server

    Chen, Zhichu; Yan, Yingbing; Yuan, Renxian; Lai, Longwei

    2013-01-01

    The beam position monitor (BPM) system is of most importance in a light source. The capability of the BPM depends on the resolution of the system. The traditional standard deviation on the raw data method merely gives the upper limit of the resolution. Principal component analysis (PCA) had been introduced in the accelerator physics and it could be used to get rid of the actual signals. Beam related informations were extracted before the evaluation of the BPM performance. A series of studies had been made in Shanghai Synchrotron Radiation Facility (SSRF) and PCA was proved as an effective and robust method in the performance evaluations of our BPM system.

  20. A nonlinear PCA algorithm based on RBF neural networks

    Institute of Scientific and Technical Information of China (English)

    YANG Bin; ZHU Zhong-ying

    2005-01-01

    Traditional PCA is a linear method, but most engineering problems are nonlinear. Using the linear PCA in nonlinear problems may bring distorted and misleading results. Therefore, an approach of nonlinear principal component analysis (NLPCA) using radial basis function (RBF) neural network is developed in this paper. The orthogonal least squares (OLS) algorithm is used to train the RBF neural network. This method improves the training speed and prevents it from being trapped in local optimization. Results of two experiments show that this NLPCA method can effectively capture nonlinear correlation of nonlinear complex data, and improve the precision of the classification and the prediction.

  1. Minimax Rates of Estimation for Sparse PCA in High Dimensions

    CERN Document Server

    Vu, Vincent Q

    2012-01-01

    We study sparse principal components analysis in the high-dimensional setting, where $p$ (the number of variables) can be much larger than $n$ (the number of observations). We prove optimal, non-asymptotic lower and upper bounds on the minimax estimation error for the leading eigenvector when it belongs to an $\\ell_q$ ball for $q \\in [0,1]$. Our bounds are sharp in $p$ and $n$ for all $q \\in [0, 1]$ over a wide class of distributions. The upper bound is obtained by analyzing the performance of $\\ell_q$-constrained PCA. In particular, our results provide convergence rates for $\\ell_1$-constrained PCA.

  2. Intrathecal Neostigmine Use For Postoperative Analgesia

    Directory of Open Access Journals (Sweden)

    Tarkan Öztürk

    2003-03-01

    Full Text Available This study aims at evaluating postoperative analgesic efficacy and safety of intrathecal neostigmine doses in patients under hemispinal anesthesia. After Ethics Committee approval, 48 patients sheduled for elective arthroscopic surgery.patients were randomly divided into four groups. Hemispinal block technique was performed at the lateral decubitis position. Group I received 1.4 ml hyperbaric bupivacaine plus 12.5 µg neostigmine, Group II received 1.4 ml hyperbaric bupivacaine plus 25 µg neostigmine, Group III received 1.4 ml hyperbaric bupivacaine plus 50 µg neostigmine, Group IV (control received 1.4 ml hyperbaric bupivacaine plus 0.1 ml saline. Tramadol was used for analgesia during postoperative period. Hemodynamic and respiratorial changes, time to first rescue analgesics, postoperative tramadol consumption, and advers effects were assessed. Neostigmine at these doses was found to have no effect on hemodynamic or respiratory parameters. The time first rescue analgesics were 273±47 minutes in GI, 595±47 minutes in GII, 869±49 minutes in GIII, 190±4 minutes in GIV. Postoperative tramadol consumtion in neostigmin groups was defined low in meaningful degree when compared to the control group. None of the patients in GIV had postoperative nausea-vomiting. Postoperative nausea-vomiting incidences were 8.3% (1 patient in GI, 33.3% In this study it was concluded that intrathecal neostigmine produce a dose-dependent analgesia and dose-dependent incidence of adverse effects with doses studied. Neostigmine 12.5 µg dosage was enough for providing comfortable postoperative analgesia with low adverse effect.

  3. Neonatal respiratory depression associated with epidural analgesia

    Directory of Open Access Journals (Sweden)

    Alberto Gálvez Toro

    2013-06-01

    Full Text Available Background: Epidural analgesia is the most effective analgesics used during childbirth but is not without its problems.In the Hospital San Juan de la Cruz of Ubeda from November 2011 we have detected 3 cases of newborn infants with signs of respiratory depression. Appeared in them: normal cardiotocographic records during childbirth, use of epidural associated with fentanyl, termination by vacuum and elevated temperature in one case.ObjectivesKnow if the neonatal adaptation to extrauterine life may be influenced by the use of epidural analgesia in childbirth. Review what role can have the rise in maternal temperature and the use of epidural fentanyl with the appearance of newborn respiratory distress.MethodsLiterature Review conducted in February of 2012 in Pubmed and the Cochrane Library, using the key words: childbirth, epidural analgesia, neonatal respiratory depression.ResultsOn the respiratory depression associated with fentanyl, a Cochrane review found indicating that newborns of mothers with an epidural, had a lower pH and were less need for administration of naloxone.On PubMed we find a review study that indicates that the respiratory depression caused by the administration of opioids via neuroaxial is rare, placing it below 1 per 1000, and a clinical case that concluded that doses of fentanyl exceeding 300 µg (approx. 5 µg/kg for 4 hours previous to childbirth, have a high risk of neonatal respiratory depression at birth.The same Cochrane review indicates that the women with epidural analgesia had increased risk of maternal fever of at least 38 ° C and a recent cohort study relates this increase in temperature with a greater likelihood of neonatal adverse events (from 37.5 ° C.ConclusionsThe studies found considered safe epidurals to the neonate and the mother, except when certain conditions are met. The literature and our clinical experience have been reports linking neonatal respiratory depression with increasing temperature (37

  4. Spinal analgesia for advanced cancer patients: an update.

    Science.gov (United States)

    Mercadante, Sebastiano; Porzio, Giampiero; Gebbia, Vittorio

    2012-05-01

    In the nineties, spinal analgesia has been described as an useful means to control pain in advanced cancer patients. The aim of this review was to update this information with a systematic analysis of studies performed in the last 10 years. 27 papers pertinent with the topic selected for review were collected according to selection criteria. Few studies added further information on spinal analgesia in last decade. Despite a lack of a clinical evidence, spinal analgesia with a combination of opioids, principally morphine, and local anesthetics may allow to achieve analgesia in patients who had been intensively treated unsuccessfully with different trials of opioids. Some adjuvant drugs such as clonidine, ketamine, betamethasone, meperidine, and ziconotide may be promising agents, but several problems have to be solved before they can be used in the daily practice. In complex pain situations, spinal analgesia should not be negated to cancer patients, and oncologists should address this group of patients to other specialists. PMID:21684173

  5. Epidural analgesia for labour: maternal knowledge, preferences and informed consent.

    LENUS (Irish Health Repository)

    2012-02-29

    Epidural analgesia has become increasingly popular as a form of labour analgesia in Ireland. However obtaining true inform consent has always been difficult. Our study recruited 100 parturients who had undergone epidural analgesia for labour, aimed to determine the information they received prior to regional analgesia, and to ascertain their preferences regarding informed consent. Only 65 (65%) of patients planned to have an epidural. Knowledge of potential complications was variable and inaccurate, with less than 30 (30%) of women aware of the most common complications. Most women 79 (79%) believed that discomfort during labour affected their ability to provide informed consent, and believe consent should be taken prior to onset of labour (96, 96%). The results of this study helps define the standards of consent Irish patients expect for epidural analgesia during labour.

  6. Sampled forms of functional PCA in reproducing kernel Hilbert spaces

    CERN Document Server

    Amini, Arash A

    2011-01-01

    We consider the sampling problem for functional PCA (fPCA), where the simplest example is the case of taking time samples of the underlying functional components. More generally, model the sampling operation as a continuous linear map from H to R^m, where the functional components to lie in some Hilbert subspace H of L^2, for example an RKHS of smooth functions. This model includes time and frequency sampling as special cases. In contrast to classical approach in fPCA in which access to entire functions is assumed, having a limited number m of functional samples places limitations on the performance of statistical procedures. We study these effects by analyzing the rate of convergence of an M-estimator for the subspace spanned by the leading components in a multi-spiked covariance model. The estimator takes the form of regularized PCA, and hence is computationally attractive. We analyze the behavior of this estimator within a non-asymptotic framework, and provide bounds that hold with high probability as a fu...

  7. PCA-Based Speech Enhancement for Distorted Speech Recognition

    Directory of Open Access Journals (Sweden)

    Tetsuya Takiguchi

    2007-09-01

    Full Text Available We investigated a robust speech feature extraction method using kernel PCA (Principal Component Analysis for distorted speech recognition. Kernel PCA has been suggested for various image processing tasks requiring an image model, such as denoising, where a noise-free image is constructed from a noisy input image. Much research for robust speech feature extraction has been done, but it remains difficult to completely remove additive or convolution noise (distortion. The most commonly used noise-removal techniques are based on the spectraldomain operation, and then for speech recognition, the MFCC (Mel Frequency Cepstral Coefficient is computed, where DCT (Discrete Cosine Transform is applied to the mel-scale filter bank output. This paper describes a new PCA-based speech enhancement algorithm using kernel PCA instead of DCT, where the main speech element is projected onto low-order features, while the noise or distortion element is projected onto high-order features. Its effectiveness is confirmed by word recognition experiments on distorted speech.

  8. Improved search of PCA databases for spectro-polarimetric inversion

    CERN Document Server

    Casini, R; Lites, B W; Ariste, A Lopez

    2013-01-01

    We describe a simple technique for the acceleration of spectro-polarimetric inversions based on principal component analysis (PCA) of Stokes profiles. This technique involves the indexing of the database models based on the sign of the projections (PCA coefficients) of the first few relevant orders of principal components of the four Stokes parameters. In this way, each model in the database can be attributed a distinctive binary number of $2^{4n}$ bits, where $n$ is the number of PCA orders used for the indexing. Each of these binary numbers (indexes) identifies a group of "compatible" models for the inversion of a given set of observed Stokes profiles sharing the same index. The complete set of the binary numbers so constructed evidently determines a partition of the database. The search of the database for the PCA inversion of spectro-polarimetric data can profit greatly from this indexing. In practical cases it becomes possible to approach the ideal acceleration factor of $2^{4n}$ as compared to the syste...

  9. Analgesia postoperatoria en la queiloplastia del lactante. Estudio comparativo: bloqueo infraorbitario intraoral bilateral con bupivacaína 0,25% con adrenalina vs. analgesia intravenosa con tramadol Postoperative analgesia for the management of chieloplasty in the breast-fed baby. Comparative study: bilateral intraoral blockade of the infraorbitary nerve with bupivacaine 0.25% plus adrenaline versus intravenous analgesia with tramadol

    Directory of Open Access Journals (Sweden)

    J. A. Delgado

    2005-05-01

    Full Text Available Objetivo: Comparar la eficacia y duración del bloqueo del nervio infraorbitario intraoral bilateral frente a la analgesia intravenosa convencional con tramadol en el control del dolor postoperatorio en lactantes sometidos a queiloplastia por labio leporino. Material y métodos: Tras la realización de una adecuada valoración preanestésica y la obtención del consentimiento informado de los padres, realizamos un estudio prospectivo, controlado aleatorizado y doble ciego en 25 niños, ASA I, con edades comprendidas entre los 3-10 meses, tras obtener el consentimiento informado de los padres, propuestos para cirugía correctora de labio leporino (queiloplastia. Todos ellos fueron premeditados, media hora antes de la intervención quirúrgica, con midazolan oral (0,5 mg.kg-1 y, en todos los casos, se practicó la técnica anestésica y el bloqueo nervioso por el mismo anestesiólogo, que consistió en una inducción inhalatoria con sevoflurano previa a la venoclisis. La anestesia general se completó con atropina, fentanilo y rocuronio a las dosis establecidas que se administraron, por vía intravenosa, previamente a la intubación endotraqueal y la ventilación mecánica. Los pacientes fueron divididos aleatoriamente en dos grupos: Grupo A (n = 12: se administró 1-2 ml de bupivacaína al 0,25% con adrenalina para el bloqueo infraorbitario bilateral y solución salina intravenosa como sustitutivo de la analgesia intravenosa con tramadol. Grupo B (n = 13: se administró solución salina para el bloqueo nervioso, en lugar de la bupivacaína, y tramadol intravenoso (1,5 mg.kg-1 como analgesia postoperatoria. En todos ellos se realizó anestesia general con sevoflurano y fentanilo "a demanda" según parámetros convencionales (tensión arterial, frecuencia cardiaca, tamaño pupilar, etc.. Durante sus primeras seis horas de estancia en Reanimación se valoró la duración de la analgesia, grado de disconfort e intensidad dolorosa. Además se anot

  10. Preventive local analgesia in orthopedic and Traumatology surgery. Analgesia local preventiva en la cirugía traumatológica y ortopédica.

    Directory of Open Access Journals (Sweden)

    Carlos M. Hernández

    2005-12-01

    Full Text Available

    Fundament: One of the most important aims of modern surgery is the recovery of the ill patients and heir integration to society. Sometimes, this wish has its limitations because of the persistence of pain after surgery. The development of an effective analgesic for after surgery pain is therefore a priority in modern medicine. Objective: To characterize the results obtained with the application of a preventive analgesic by infiltrating without limitations of the use of any other analgesic if necessary. Method: Prospective-descriptive study in a series of 30 patients assisted at the Orthopaedic Service of the ¨Dr. Gustavo Aldereguía Lima¨ Hospital from Cienfuegos province in the period that covers September 2004- march 2005. Anaesthetic infiltration in the surgical area was applied once the surgery was ended . Bupivacaine 0,125 % in a volume of 20 ml and 2 drops of epinephrine without avoiding the use of any other analgesic. Results: a group of 13 patients presented pain in the first 24-48 hours after surgery followed by another group of 9 patients who alleviated pain in the period between 12 and 23 hours after surgery. Conclusions: In this series of patients it was shown the benefits of anaesthetic infiltration in the surgical area with analgesic purposes, since it causes pain alleviation in a period greater than 24 hours. Bupivacaine shows good results since it causes after surgery analgesia and the early application in the rehabilitation of a great number of patients.

    Fundamento: Uno de los propósitos más importantes de la cirugía moderna es la pronta recuperación del enfermo y su integración a la sociedad. Este anhelo se limita frecuentemente por la persistencia del dolor, fundamentalmente en etapa posoperatoria. El desarrollo de una analgesia efectiva para el dolor

  11. Meningitis tras anestesia y analgesia espinal

    OpenAIRE

    M. Robles Romero; M.A. Rojas Caracuel; C. del Prado Álvarez

    2013-01-01

    El objetivo de esta revisión es una puesta al día en la etiología, diagnóstico, profilaxis y tratamiento de la meningitis tras anestesia y analgesia espinales. Aunque es una complicación mayor de esta técnica y su incidencia es baja, cada vez son más frecuentes los casos publicados en la literatura médica. Según su etiología se les clasifica en meningitis sépticas, víricas y asépticas. Las meningitis sépticas son las más frecuentes, y en su etiología cada vez juega un papel más destacado como...

  12. A Novel Approach for Iris Recognition using DWT&PCA

    Directory of Open Access Journals (Sweden)

    Manjunath M

    2013-07-01

    Full Text Available The Iris pattern is an important biological feature of human body. The recognition of an individual based on iris pattern is gaining more popularity due to the uniqueness of the pattern among the people. In this paper PCA based iris recognition using DWT is proposed. The upper and lower portion of the iris which is occluded by the eyelids and eyelashes is removed using morphological process. According to Springer Analysis of CASIA data base, to get better recognition forty five pixels to left and right of the pupil boundary is considered as iris template for the proposed algorithm analysis. The image is enhanced using Histogram. Equalization to get high contrast. DWT is applied on histogram equalized iris template to get DWT coefficients. The features are extracted from the approximation band of the DWT coefficients using PCA. Multiple classifiers such as KNN, RF and SVM are used for matching. The proposed algorithm has better performance parameters compared to existing algorithm.

  13. Object tracking based on two-dimensional PCA

    Science.gov (United States)

    Xu, Fuyuan; Gu, Guohua; Kong, Xiaofang; Wang, Pengcheng; Ren, Kan

    2016-04-01

    In this paper, we present a novel object tracking method based on two-dimensional PCA. The low quality of images and the changes of the object appearance are very challenging for the object tracking. The representation of the training features is usually used to solve these challenges. Two-dimensional PCA (2DPCA) based on the image covariance matrix is constructed directly using the original image matrices. An appearance model is presented and its likelihood estimation has been established based on 2DPCA representation in this paper. Compared with the state-of-the-art methods, our method has higher reliability and real-time property. The performances of the proposed tracking method are quantitatively and qualitatively shown in experiments.

  14. The PCA replica experiment. Part I: Winfrith measurements and calculations

    International Nuclear Information System (INIS)

    This paper gives the results of all measurements which have been processed to date and the results of corresponding Monte Carlo predictions made with McBEND. Some sensitivity coefficients given by the DUCKPOND (4) module in McBEND are also given. Other measurements have been made by collaborators from HEDL (US), SCK/CEN (Mol, Belgium) and BNL (UK). These will be given, together with attribution, in Part 11 of this paper in which a full analysis of both the REPLICA and PCA experiments will be presented. This analysis waits upon further McBEND calculations in the PCA experiment to reduce the statistical uncertainties in the calculations to the point where they are not dominant contributors to the total calculational uncertainties

  15. Human Gait Recognition Based on Kernel PCA Using Projections

    Institute of Scientific and Technical Information of China (English)

    Murat Ekinci; Murat Aykut

    2007-01-01

    This paper presents a novel approach for human identification at a distance using gait recognition. Recog- nition of a person from their gait is a biometric of increasing interest. The proposed work introduces a nonlinear machine learning method, kernel Principal Component Analysis (PCA), to extract gait features from silhouettes for individual recognition. Binarized silhouette of a motion object is first represented by four 1-D signals which are the basic image features called the distance vectors. Fourier transform is performed to achieve translation invariant for the gait patterns accumulated from silhouette sequences which are extracted from different circumstances. Kernel PCA is then used to extract higher order relations among the gait patterns for future recognition. A fusion strategy is finally executed to produce a final decision. The experiments are carried out on the CMU and the USF gait databases and presented based on the different training gait cycles.

  16. ZAP - enhanced PCA sky subtraction for integral field spectroscopy

    Science.gov (United States)

    Soto, Kurt T.; Lilly, Simon J.; Bacon, Roland; Richard, Johan; Conseil, Simon

    2016-05-01

    We introduce Zurich Atmosphere Purge (ZAP), an approach to sky subtraction based on principal component analysis (PCA) that we have developed for the Multi Unit Spectrographic Explorer (MUSE) integral field spectrograph. ZAP employs filtering and data segmentation to enhance the inherent capabilities of PCA for sky subtraction. Extensive testing shows that ZAP reduces sky emission residuals while robustly preserving the flux and line shapes of astronomical sources. The method works in a variety of observational situations from sparse fields with a low density of sources to filled fields in which the target source fills the field of view. With the inclusion of both of these situations, the method is generally applicable to many different science cases and should also be useful for other instrumentation. ZAP is available for download at http://muse-vlt.eu/science/tools.

  17. ZAP -- Enhanced PCA Sky Subtraction for Integral Field Spectroscopy

    CERN Document Server

    Soto, Kurt T; Bacon, Roland; Richard, Johan; Conseil, Simon

    2016-01-01

    We introduce Zurich Atmosphere Purge (ZAP), an approach to sky subtraction based on principal component analysis (PCA) that we have developed for the Multi Unit Spectrographic Explorer (MUSE) integral field spectrograph. ZAP employs filtering and data segmentation to enhance the inherent capabilities of PCA for sky subtraction. Extensive testing shows that ZAP reduces sky emission residuals while robustly preserving the flux and line shapes of astronomical sources. The method works in a variety of observational situations from sparse fields with a low density of sources to filled fields in which the target source fills the field of view. With the inclusion of both of these situations the method is generally applicable to many different science cases and should also be useful for other instrumentation. ZAP is available for download at http://muse-vlt.eu/science/tools.

  18. Manejo de la analgesia postoperatoria en las primeras 24 horas en un Hospital de segundo nivel: Estudio observacional Postoperative analgesia treatment during the first 24 hours in a second level hospital.

    Directory of Open Access Journals (Sweden)

    D. L. Fernández

    2006-01-01

    Full Text Available Objetivo: Evaluar el cumplimiento y eficacia de la medicación analgésica no protocolizada y utilizada en un hospital de segundo nivel en las 24 h posteriores a cirugía, donde la intensidad del dolor está catalogada como moderada severa. Método: Estudio prospectivo y observacional. Se incluyeron 119 pacientes mayores de 18 años, intervenidos de cirugía traumatológica: prótesis total de cadera, rodilla, artrodesis vertebral, cirugía de hombro y laparotomías. Ante la falta de protocolos, la medicación analgésica postoperatoria de base y de rescate fue prescrita según criterio del anestesiólogo responsable. La administración de cloruro mórfico y el empleo de los dispositivos de administración: catéteres peridurales, PCA (analgesia controlada por el paciente quedaron restringidos a la unidad de recuperación anestésica (URPA y al área crítica. En planta de hospitalización los opiáceos prescritos fueron la meperidina por vía intramuscular y el tramadol endovenoso. Los opiáceos siempre se asociaron a analgésicos parenterales como metamizol, diclofenaco o paracetamol Se valoró la intensidad del dolor (VAS 0-100 mm y escala verbal EV 1-4 24 h después de la cirugía (24 y se registró la máxima intensidad de dolor percibida en el primer día de postoperatorio (Max. Se consideró el porcentaje de pacientes con dolor no controlado (DNC: VAS >30 y EV >2 para los momentos 24 y Max. Se consignaron las dosis de fármacos analgésicos de base y rescate, prescritos y consumidos. Para cada analgésico prescrito como base, se calculó la diferencia porcentual entre la dosis media prescrita y la dosis media consumida, indicador que se denominó grado de cumplimiento (GC. Resultados: Intensidad de dolor 24: VAS 27.8 ± 22.6, EV 2; porcentaje de pacientes con DNC según VAS /EV: 36.1/ 42.8%, respectivamente. Max: VAS 58.4 ± 28.9, EV 4; DNC según VAS/EV : 79.8 / 82.3 %, respectivamente. Prescripción de opiáceos (Nº pacientes, X ± DE

  19. Preemptive analgesia with ketamine for laparoscopic cholecystectomy

    Directory of Open Access Journals (Sweden)

    Harsimran Singh

    2013-01-01

    Full Text Available Background: The aim of preemptive analgesia is to reduce central sensitization that arises from noxious inputs across the entire perioperative period. N-methyl d-aspartate receptor antagonists have the potential for attenuating central sensitization and preventing central neuroplasticity. Materials and Methods: Patients undergoing laparoscopic cholecystectomy were randomized into four groups of 20 patients each, who were administered the study drug intravenously 30 min before incision. Groups A, B, and C received ketamine in a dose of 1.00, 0.75 and 0.50 mg/kg, respectively, whereas group D received isotonic saline. Anesthetic and surgical techniques were standardized. Postoperatively, the degree of pain at rest, movement, and deep breathing using visual analogue scale, time of request for first analgesic, total opioid consumption, and postoperative nausea and vomiting were recorded in postanesthesia care unit for 24 h. Results: Pain scores were highest in Group D at 0 h. Groups A, B, and C had significantly decreased postoperative pain scores at 0, 0.5, 3, 4, 5, 6, and 12 h. Postoperative analgesic consumption was significantly less in groups A, B, and C as compared with group D. There was no significant difference in the pain scores among groups A, B, and C. Group A had a significantly higher heart rate and blood pressure than groups B and C at 0 and 0.5 h along with 10% incidence of hallucinations. Conclusion: Preemptive ketamine has a definitive role in reducing postoperative pain and analgesic requirement in patients undergoing laparoscopic cholecystectomy. The lower dose of 0.5 mg/kg being devoid of any adverse effects and hemodynamic changes is an optimal dose for preemptive analgesia in patients undergoing laparoscopic cholecystectomy.

  20. IMPROVEMENT OF CLUSTERING ON HIGH DIMENSIONAL DATASETS USING PCA

    OpenAIRE

    Dr. Dharmender Kumar

    2012-01-01

    The last decade has seen an explosive growth in the generation and collection of data. In the field of data mining there are various techniques are used to extract useful information from the data set. There is various estimation techniques are used in clustering methods out of these Euclidean distance and density is used for estimation. Out of these estimation techniques one another technique mass is also used. Mass based clustering gives better performance when apply with PCA technique in m...

  1. A Novel Approach for Iris Recognition using DWT&PCA

    OpenAIRE

    Manjunath M; DR K B Raja

    2013-01-01

    The Iris pattern is an important biological feature of human body. The recognition of an individual based on iris pattern is gaining more popularity due to the uniqueness of the pattern among the people. In this paper PCA based iris recognition using DWT is proposed. The upper and lower portion of the iris which is occluded by the eyelids and eyelashes is removed using morphological process. According to Springer Analysis of CASIA data base, to get better recognition forty five pixels to left...

  2. Technology Marketing using PCA , SOM, and STP Strategy Modeling

    OpenAIRE

    Sunghae Jun

    2011-01-01

    Technology marketing is a total processing about identifying and meeting the technological needs of human society. Most technology results exist in intellectual properties like patents. In our research, we consider patent document as a technology. So patent data are analyzed by Principal Component Analysis (PCA) and Self Organizing Map (SOM) for STP(Segmentation, Targeting, and Positioning) strategy modeling. STP is a popular approach for developing marketing strategies. We use STP strategy m...

  3. PCA-based population structure inference with generic clustering algorithms

    OpenAIRE

    Huang Chun-Hsi; Abdool Ali; Lee Chih

    2009-01-01

    Abstract Background Handling genotype data typed at hundreds of thousands of loci is very time-consuming and it is no exception for population structure inference. Therefore, we propose to apply PCA to the genotype data of a population, select the significant principal components using the Tracy-Widom distribution, and assign the individuals to one or more subpopulations using generic clustering algorithms. Results We investigated K-means, soft K-means and spectral clustering and made compari...

  4. Image Resolution Enhancement Using PCA Based Post Filtering

    OpenAIRE

    Qiang Guo; Ya Chen

    2013-01-01

    In this study an image resolution enhancement method is presented that uses the NEDI method to generate an initial image. To increase the detail of this initial image, the given low resolution image is fused with it to achieve a new image. Then the final high resolution image is obtained by using a PCA based filtering to reduce the distortion of this new image. Experimental results on test images demonstrate that the proposed method provides competitive performance.

  5. Facial Expressions recognition Based on Principal Component Analysis (PCA)

    OpenAIRE

    2014-01-01

    The facial expression recognition is an ocular task that can be performed without human discomfort, is really a speedily growing on the computer research field. There are many applications and programs uses facial expression to evaluate human character, judgment, feelings, and viewpoint. The process of recognizing facial expression is a hard task due to the several circumstances such as facial occlusions, face shape, illumination, face colors, and etc. This paper present a PCA methodology to ...

  6. Sedação e analgesia em neonatologia Sedación y analgesia en neonatología Sedation and analgesia in neonatology

    Directory of Open Access Journals (Sweden)

    Yerkes Pereira e Silva

    2007-10-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: A importância do estudo da dor em Neonatologia se deve ao fato de que a sensação de dor e estresse significa sofrimento e desconforto para os recém-nascidos e, apesar desse conhecimento, pouco tem sido feito para minimizá-los. Nessa revisão foram discutidas: a prevenção da dor, as medidas não-farmacológicas e farmacológicas para o seu tratamento e a sedação em recém-nascidos. CONTEÚDO: Várias são as medidas não-farmacológicas que podem ser tomadas com intuito de prevenir a dor nas Unidades de Terapia Intensiva Neonatal e também para tornar o ambiente mais humanizado e menos estressante para os pacientes e seus familiares. O tratamento da dor no recém-nascido consiste em medidas não-farmacológicas (sucção não-nutritiva, glicose e farmacológicas (analgésicos não-opióides, opióides e anestésicos locais. A sedação em recém-nascidos é produzida por fármacos que agem diminuindo a atividade, a ansiedade e a agitação do paciente, podendo levar à amnésia de eventos dolorosos ou não-dolorosos. A sedação pode ser feita pela administração de hidrato de cloral, barbitúricos, propofol e benzodiazepínicos. CONCLUSÕES: A prevenção da dor e a indicação de analgesia devem ser individualizadas e sempre consideradas em todos os recém-nascidos portadores de doenças potencialmente dolorosas e/ou submetidos a procedimentos invasivos, cirúrgicos ou não.JUSTIFICATIVA Y OBJETIVOS: La importancia del estudio del dolor en neonatología se debe al hecho de que la sensación de dolor y de estrés significa sufrimiento e incomodidad para los recién nacidos y, a pesar de ese conocimiento poco se ha hecho para reducirlo. Dentro de esa revisión se discutieron: la prevención del dolor, las medidas no farmacológicas ye farmacológicas para su tratamiento y la sedación en recién nacidos. CONTENIDO: Varias son las medidas no-farmacológicas que pueden ser tomadas con el objetivo de prevenir el

  7. ToF-SIMS PCA analysis of Myrtus communis L.

    Science.gov (United States)

    Piras, F. M.; Dettori, M. F.; Magnani, A.

    2009-06-01

    Nowadays there is a growing interest of researchers for the application of sophisticated analytical techniques in conjunction with statistical data analysis methods to the characterization of natural products to assure their authenticity and quality, and for the possibility of direct analysis of food to obtain maximum information. In this work, time-of-flight secondary ion mass spectrometry (ToF-SIMS) in conjunction with principal components analysis (PCA) are applied to study the chemical composition and variability of Sardinian myrtle ( Myrtus communis L.) through the analysis of both berries alcoholic extracts and berries epicarp. ToF-SIMS spectra of berries epicarp show that the epicuticular waxes consist mainly of carboxylic acids with chain length ranging from C20 to C30, or identical species formed from fragmentation of long-chain esters. PCA of ToF-SIMS data from myrtle berries epicarp distinguishes two groups characterized by a different surface concentration of triacontanoic acid. Variability in antocyanins, flavonols, α-tocopherol, and myrtucommulone contents is showed by ToF-SIMS PCA analysis of myrtle berries alcoholic extracts.

  8. Application effect comparison of pentazocine for intravenous analgesia and epidural analgesia after caesarean section%喷他佐辛在剖宫产术后静脉镇痛与硬膜外镇痛中的应用效果比较

    Institute of Scientific and Technical Information of China (English)

    罗新萍; 尹新武; 罗芳; 周生智

    2015-01-01

    Objective To compare the application effect of pentazocine on patient-controlled intravenous analgesia (PCIA) and patient-controlled epidural analgesia (PCEA) after caesarean section. Methods 120 patients who needed postoperative analgesia after caesarean section in our hospital from November 2013 to April 2014 were selected and evenly divided into PCIA group and PCEA group in random.In PCEA group,90 mg pentazocine,215 mg ropivacaine,5 mg tropisetron,and normal saline were mixed to 100 ml,while in PCIA group,90 mg pentazocine,2 mg propacetamol,5 mg tropisetron,and normal saline were mixed to 100 ml.Fifteen minutes before the end of surgery,disposable patient-controlled analgesia pump (PCA) was connected in both groups.The mode of LCP referred to 5 ml load dosage,2 ml con-tinuous infusion dosage,and 2 ml self-controlled bolus for 15 set minutes.Scores of analgesia and sedation 6 h,12 h,24 h,36 h,and 48 h after surgery were observed.The adverse reactions like nausea,vomiting,respiratory depression,retention of urine after surgery,postoperative pump dropping,and numbness of lower limb were also observed in order to know pa-tient’s satisfaction. Results There was no significant difference about score of analgesia between the two groups (P>0.05).Within 24-hour application of PCA pump,there was significant difference in Ramsay sedation score between the two groups (P0.05)。在自控镇痛泵使用24 h内,两组Ramsay镇静评分差异有统计学意义(P<0.05)。 PICA组患者对镇痛泵的满意度为95%,高于PCEA组的85%,差异有统计学意义(P<0.05)。结论喷他佐辛用于剖宫产PCEA和PCIA镇痛效果相当,但PCIA还具有携带方便、操作简单等优点,可避免留置硬膜外导管可能发生的并发症,患者的满意度较高,PICA更适合剖宫产手术,值得推广。

  9. Labor Epidural Analgesia and Breastfeeding: A Systematic Review.

    Science.gov (United States)

    French, Cynthia A; Cong, Xiaomei; Chung, Keun Sam

    2016-08-01

    Despite widespread use of epidural analgesia during labor, no consensus has been reached among obstetric and anesthesia providers regarding its effects on breastfeeding. The purpose of this review was to examine the relationship between labor epidural analgesia and breastfeeding in the immediate postpartum period. PubMed, Cochrane Library, and Cumulative Index to Nursing and Allied Health Literature were searched for articles published in 1990 or thereafter, using the search term breastfeeding combined with epidural, labor epidural analgesia, labor analgesia, or epidural analgesia Of 117 articles, 23 described empirical studies specific to labor epidural analgesia and measured a breastfeeding outcome. Results were conflicting: 12 studies showed negative associations between epidural analgesia and breastfeeding success, 10 studies showed no effect, and 1 study showed a positive association. Most studies were observational. Of 3 randomized controlled studies, randomization methods were inadequate in 2 and not evaluable in 1. Other limitations were related to small sample size or inadequate study power; variation and lack of information regarding type and dosage of analgesia or use of other intrapartum interventions; differences in timing, definition, and method of assessing breastfeeding success; or failure to consider factors such as mothers' intention to breastfeed, social support, siblings, or the mother's need to return to work or school. It is also unclear to what extent results are mediated through effects on infant neurobehavior, maternal fever, oxytocin release, duration of labor, and need for instrumental delivery. Clinician awareness of factors affecting breastfeeding can help identify women at risk for breastfeeding difficulties in order to target support and resources effectively. PMID:27121239

  10. Fetal circulation during epidural analgesia for caesarean section.

    OpenAIRE

    Lindblad, A; Marsál, K; Vernersson, E; Renck, H

    1984-01-01

    Fetal blood flow was examined during epidural analgesia in six women with uncomplicated pregnancies undergoing elective caesarean section. A non-invasive, ultrasonic technique was used to measure blood flow in the fetal descending aorta and intra-abdominal part of the umbilical vein before induction of analgesia with etidocaine and bupivacaine and 15 and 30 minutes afterwards. No appreciable change in fetal blood flow was observed.

  11. Relação entre a gravidade do trauma e padrões de analgesia utilizados em acidentados de transporte Relación entre la gravedad del trauma y los estándares de analgesia utilizados en accidentados de tránsito Relationship between trauma severity and analgesia standarts used in traffic accident victims

    Directory of Open Access Journals (Sweden)

    Ana Maria Calil

    2009-06-01

    Full Text Available Trata-se de um estudo inédito realizado no país, que identificou relações entre o padrão analgésico e a gravidade do trauma. Para tal, analisou-se uma população de 200 acidentados de transporte admitidos para tratamento na unidade de emergência de um hospital referência para o atendimento ao trauma no Município de São Paulo. A gravidade das lesões e do trauma foi caracterizada por índices de gravidade anatômicos. A partir da análise da terapia analgésica encontrada, construíram-se padrões de analgesia, tendo como base a escala analgésica da Organização Mundial de Saúde. Os resultados permitiram identificar associação estatística entre a gravidade do trauma e padrões distintos de analgesia. Espera-se que a divulgação desses achados possa servir de base para a criação de protocolos de analgesia em trauma e melhoria da qualidade da assistência, além de servir de estímulo para o desenvolvimento de estudos em uma área com tantas lacunas de conhecimento em nosso meio.Se trata de un estudio inédito, realizado en el país, que identificó relaciones entre el estándar analgésico y la gravedad del trauma. Para esto, se analizó una población de 200 accidentados en el tránsito, admitidos para tratamiento en una Unidad de emergencia de un hospital de referencia para la atención de traumas, en el Municipio de San Pablo. La gravedad de las lesiones y del trauma fue caracterizada por índices de gravedad anatómicos. Del análisis de la terapia analgésica encontrada se construyeron estándares de analgesia, teniendo como base la escala analgésica de la Organización Mundial de Salud. Los resultados permitieron identificar una asociación estadística entre la gravedad del trauma y los distintos estándares de analgesia. Se espera que la divulgación de lo encontrado pueda servir de base para crear protocolos de analgesia en traumas, mejorar la calidad de la asistencia y servir de estímulo para el desarrollo de

  12. Optimizing the clinical utility of PCA3 to diagnose prostate cancer in initial prostate biopsy

    OpenAIRE

    Rubio-Briones, Jose; Borque, Angel; Esteban, Luis M.; Casanova, Juan; Fernandez-Serra, Antonio; Rubio, Luis; Casanova-Salas, Irene; Sanz, Gerardo; Domínguez-Escrig, Jose; Collado, Argimiro; Gómez-Ferrer, Alvaro; Iborra, Inmaculada; Ramírez-Backhaus, Miguel; Martínez, Francisco; Calatrava, Ana

    2015-01-01

    Background PCA3 has been included in a nomogram outperforming previous clinical models for the prediction of any prostate cancer (PCa) and high grade PCa (HGPCa) at the initial prostate biopsy (IBx). Our objective is to validate such IBx-specific PCA3-based nomogram. We also aim to optimize the use of this nomogram in clinical practice through the definition of risk groups. Methods Independent external validation. Clinical and biopsy data from a contemporary cohort of 401 men with the same in...

  13. Ultrasound-guided rectus sheath and transversus abdominis plane blocks for perioperative analgesia in upper abdominal surgery: A randomized controlled study

    Directory of Open Access Journals (Sweden)

    Khaled Abdelsalam

    2016-01-01

    Full Text Available Background: Regional anesthetic techniques can be used to alleviate postoperative pain in patients undergoing major upper abdominal surgery. Our aim was to evaluate the efficacy of bilateral ultrasound (US-guided rectus sheath (RS and transversus abdominis plane (TAP blocks for better perioperative analgesia. Patients and Methods: It is a prospective, observer-blinded, randomized clinical study. 40 eligible patients undergoing elective liver resection or Whipple procedure were included. All patients received a standardized anesthetic technique. Group 1 (n = 20 received preincisional US-guided bilateral RS and TAP blocks using 20 ml volume of bupivacaine 0.25% for each, and group 2 (n = 20 received local wound infiltration at end of surgery with 40 ml of bupivacaine 0.25%. A standardized postoperative analgesic regimen composed of intravenous paracetamol and a morphine patient-controlled analgesia (PCA. The use of intraoperative fentanyl and recovery room morphine boluses, PCA-administered morphine, pain scores as well as number of patients′ experienced postoperative nausea and vomiting in the ward at 6 and 24 h were recorded. Results: Group 1 patients received a significantly lower cumulative intraoperative fentanyl, significantly lesser boluses of morphine in postanesthesia care unit, as well, significantly lower cumulative 24 h postoperative morphine dosage than the group 2 patients. Pain visual analog scale scores were significantly lower at both 6 and 24 h postoperatively in TAP group when compared with the no-TAP group. There were no complications related to the TAP block procedures. No signs or symptoms of local anesthetic systemic toxicity were detected. Conclusion: The combination of bilateral US-guided RS and TAP blocks provides excellent perioperative analgesia for major upper abdominal surgery.

  14. Sedação e analgesia em terapia intensiva Sedación y analgesia en terapia intensiva Sedation and analgesia in intensive care

    OpenAIRE

    Fábio Ely Martins Benseñor; Domingos Dias Cicarelli

    2003-01-01

    JUSTIFICATIVA E OBJETIVOS: A ansiedade e a dor podem causar maior desconforto e risco aumentado de complicações no pós-operatório de pacientes cirúrgicos, prolongando inclusive seu tempo de internação. O objetivo deste estudo foi revisar os conceitos de sedação e analgesia em terapia intensiva, atualizando os conhecimentos e permitindo a revisão das informações disponíveis na literatura, assim como os consensos já publicados. CONTEÚDO: Apresentamos separadamente a sedação e analgesia, revisan...

  15. Conservation of PcaQ, a transcriptional activator of pca genes for catabolism of phenolic compounds, in Agrobacterium tumefaciens and Rhizobium species.

    OpenAIRE

    Parke, D

    1996-01-01

    In Agrobacterium tumefaciens A348, control of five genes for catabolism of the phenolic compound protocatechuate to beta-ketoadipate is exerted by the gene pcaQ. The product of pcaQ is a transcriptional activator which is distinct from regulators of the beta-ketoadipate pathway characterized in other bacterial groups. An investigation of whether pcaQ is present and conserved in related Rhizobium species employed Southern hybridization and an agrobacterial pcaD::LacZ promoter probe plasmid. Th...

  16. Opioides como coadyuvantes de la analgesia epidural en pediatría Opiates as co-adjuvants of epidural analgesia in pediatrics

    Directory of Open Access Journals (Sweden)

    M. A. Vidal

    2005-09-01

    Full Text Available Hay un elevado número de receptores opioides localizados en la sustancia gelatinosa del asta dorsal medular. La inyección epidural de opioides permite la unión de forma saturable y competitiva con estos receptores, con lo que se consigue analgesia y disminución del riesgo de efectos adversos asociados a la administración parenteral de los mismos. No obstante, es importante tener en cuenta los posibles efectos adversos que pueden aparecer, siendo la depresión respiratoria la complicación más importante. La morfina es el opioide agonista mu más utilizado para el tratamiento del dolor agudo o crónico y constituye el analgésico estándar con el que se comparan los nuevos analgésicos. El fentanilo es un agonista opioide derivado de la fenilpiperidina que posee una alta afinidad por los receptores mu, lo que le confiere una potencia analgésica 50-100 veces superior a la morfina. El tramadol es el más reciente de los opioides sintéticos empleados en España. Tiene baja afinidad por los receptores mu, kappa y delta, no obstante su potencia analgésica respecto a la morfina es 1/10 por vía parenteral y 1/30 por vía espinal. Los opioides por vía epidural se han empleado ampliamente en adultos, pero con una frecuencia mucho menor en pediatría. En este artículo se repasan los distintos estudios que han evaluado sus efectos en pediatría, haciendo referencia a la farmacocinética, consideraciones clínicas y posibles efectos adversos tras la administración de morfina, fentanilo o tramadol por vía epidural.There is a high number of opiate receptors located at the gelatinous substance of the medullar dorsal horn. Epidural injection of opiates allows saturable and competitive binding to these receptors, thus providing analgesia and reducing the risk of side effects associated to their parenteral administration. However, potential side effects must be taken into account, the major complication being respiratory depression. Morphine is the

  17. Bloqueos nerviosos periféricos de la extremidad inferior para analgesia postoperatoria y tratamiento del dolor crónico Lower limb continuous peripheral nerve blocks for postoperative analgesia and chronic pain

    Directory of Open Access Journals (Sweden)

    V. Domingo

    2004-05-01

    Full Text Available Existe un interés creciente por la realización de los bloqueos de nervio periférico (BNP debido a sus potenciales beneficios como los concernientes a las interacciones de los fármacos anticoagulantes y los bloqueos neuroaxiales. Los BNP de la extremidad inferior, y sobre todo, los bloqueos periféricos del nervio ciático son el pariente pobre de las técnicas de anestesia regional y, en general, son poco conocidos y por tanto poco utilizados. En este artículo se realiza una revisión de los bloqueos del plexo lumbosacro, realizando especial énfasis en los bloqueos continuos mediante catéteres para analgesia postoperatoria y para el tratamiento del dolor crónico. La utilización de anestésicos locales de larga duración de acción, asociada a un escaso bloqueo motor, como es el caso de la ropivacaína, nos permite combinar técnicas de punción única para conseguir una adecuada analgesia intraoperatoria, con las técnicas de perfusión continua para analgesia postoperatoria. Es necesario un conocimiento anatómico preciso, así como de los territorios cutáneos de inervación de las ramas del plexo lumbosacro, para la realización de estas técnicas de bloqueo. La introducción de diferentes técnicas de imagen, fundamentalmente la ultrasonografía, para la localización de las estructuras nerviosas, facilita la realización de estos bloqueos y disminuye el riesgo de lesiones de los órganos adyacentes. La realización de los bloqueos continuos de nervio periférico ofrece el beneficio de una analgesia postoperatoria prolongada, con menores efectos adversos, mayor grado de satisfacción del paciente, y una recuperación funcional más rápida después de la cirugía.There is increasing interest in peripheral nerve blocks (PNB because of potential benefits relative to interactions of anticoagulants and central neuraxial techniques. Among all the regional anesthesia procedures, PNB of the lower limb, and specially sciatic nerve block

  18. Batch process monitoring based on multilevel ICA-PCA

    Institute of Scientific and Technical Information of China (English)

    Zhi-qiang GE; Zhi-huan SONG

    2008-01-01

    In this paper,we describe a new batch process monitoring method based on multilevel independent component analysis and principal component analysis (MLICA-PCA).Unlike the conventional multi-way principal component analysis (MPCA) method,MLICA-PCA provides a separated interpretation for multilevel batch process data.Batch process data are partitioned into two levels:the within-batch level and the between-batch level.In each level,the Gaussian and non-Ganssian components of process information can be separately extracted.I2,T2 and SPE statistics are individually built and monitored.The new method facilitates fault diagnosis.Since the two variation levels arc decomposed,the variables responsible for faults in each level can be identified and interpreted more easily.A case study of the Dupont benchmark process showed that the proposed method was more efficient and interpretable in fault detection and diagnosis,compared to the alternative batch process monitoring method.

  19. PCA-HOG symmetrical feature based diseased cell detection

    Science.gov (United States)

    Wan, Min-jie

    2016-04-01

    A histogram of oriented gradient (HOG) feature is applied to the field of diseased cell detection, which can detect diseased cells in high resolution tissue images rapidly, accurately and efficiently. Firstly, motivated by symmetrical cellular forms, a new HOG symmetrical feature based on the traditional HOG feature is proposed to meet the condition of cell detection. Secondly, considering the high feature dimension of traditional HOG feature leads to plenty of memory resources and long runtime in practical applications, a classical dimension reduction method called principal component analysis (PCA) is used to reduce the dimension of high-dimensional HOG descriptor. Because of that, computational speed is increased greatly, and the accuracy of detection can be controlled in a proper range at the same time. Thirdly, support vector machine (SVM) classifier is trained with PCA-HOG symmetrical features proposed above. At last, practical tissue images is detected and analyzed by SVM classifier. In order to verify the effectiveness of this new algorithm, it is practically applied to conduct diseased cell detection which takes 200 pieces of H&E (hematoxylin & eosin) high resolution staining histopathological images collected from 20 breast cancer patients as a sample. The experiment shows that the average processing rate can be 25 frames per second and the detection accuracy can be 92.1%.

  20. A acupuntura na analgesia do parto: percepções das parturientes La acupuntura en la analgesía del parto: percepciones de las parturientas Acupunture in childbirth analgesia: perceptions of the parturients

    OpenAIRE

    Jussara Gue Martini; Sandra Greice Becker

    2009-01-01

    O estudo objetivou conhecer as percepções das parturientes atendidas na Maternidade do Hospital Universitário de Florianópolis (HU) sobre a utilização da acupuntura na analgesia das dores do parto. Por meio de entrevistas com 31 parturientes, atendidas em procedimento de parto normal, em abril de 2005, obteve-se como resultados: 60% das protagonistas do estudo tem de 20 a 30 anos, são procedentes de Florianópolis em 90% dos casos. Uma grande parcela das mulheres atendidas na Maternidade não t...

  1. Preemptive analgesia II: recent advances and current trends.

    LENUS (Irish Health Repository)

    Kelly, D J

    2012-02-03

    PURPOSE: This two-part review summarizes the current knowledge of physiological mechanisms, pharmacological modalities and controversial issues surrounding preemptive analgesia. SOURCE: Articles from 1966 to present were obtained from the MEDLINE databases. Search terms included analgesia, preemptive; neurotransmitters; pain, postoperative; hyperalgesia; sensitization, central nervous system; pathways, nociception; anesthetic techniques; analgesics, agents. Principal findings: In Part I of this review article, techniques and agents that attenuate or prevent central and peripheral sensitization were reviewed. In Part II, the conditions required for effective preemptive techniques are evaluated. Specifically, preemptive analgesia may be defined as an antinociceptive treatment that prevents establishment of altered central processing of afferent input from sites of injury. The most important conditions for establishment of effective preemptive analgesia are the establishment of an effective level of antinociception before injury, and the continuation of this effective analgesic level well into the post-injury period to prevent central sensitization during the inflammatory phase. Although single-agent therapy may attenuate the central nociceptive processing, multi-modal therapy is more effective, and may be associated with fewer side effects compared with the high-dose, single-agent therapy. CONCLUSION: The variable patient characteristics and timing of preemptive analgesia in relation to surgical noxious input require individualization of the technique(s) chosen. Multi-modal analgesic techniques appear more effective.

  2. Continuous shoulder analgesia via an indwelling axillary brachial plexus catheter.

    Science.gov (United States)

    Reuben, S S; Steinberg, R B

    2000-09-01

    Continuous interscalene brachial plexus blockade can provide anesthesia and analgesia in the shoulder region. Difficulty accessing the interscalene space and premature displacement of interscalene catheters may preclude their use in certain situations. We present two case reports in which a catheter was advanced from the axilla along the brachial plexus sheath to the interscalene space to provide continuous cervicobrachial plexus analgesia. In the first case report, previous neck surgery made the anatomic landmarks for performing an interscalene block very difficult. An epidural catheter was advanced from the axillary brachial plexus sheath to the interscalene space under fluoroscopic guidance. This technique provided both intraoperative analgesia for shoulder surgery as well as 24-hour postoperative analgesia by an infusion of 0.125% bupivacaine. In the second case report, a catheter was inserted in a similar fashion from the axillary to the interscalene space to provide 14 days of continuous analgesia in the management of complex regional pain syndrome. We have found that this technique allows us to secure the catheter more easily than with the traditional interscalene approach and thus prevents premature dislodgment. This approach may be a suitable alternative when either an interscalene or an infraclavicular catheter may not be inserted. PMID:11090734

  3. Preemptive analgesia I: physiological pathways and pharmacological modalities.

    LENUS (Irish Health Repository)

    Kelly, D J

    2012-02-03

    PURPOSE: This two-part review summarizes the current knowledge of physiological mechanisms, pharmacological modalities and controversial issues surrounding preemptive analgesia. SOURCE: Articles from 1966 to present were obtained from the MEDLINE databases. Search terms included: analgesia, preemptive; neurotransmitters; pain, postoperative; hyperalgesia; sensitization, central nervous system; pathways, nociception; anesthetic techniques; analgesics, agents. Principal findings: The physiological basis of preemptive analgesia is complex and involves modification of the pain pathways. The pharmacological modalities available may modify the physiological responses at various levels. Effective preemptive analgesic techniques require multi-modal interception of nociceptive input, increasing threshold for nociception, and blocking or decreasing nociceptor receptor activation. Although the literature is controversial regarding the effectiveness of preemptive analgesia, some general recommendations can be helpful in guiding clinical care. Regional anesthesia induced prior to surgical trauma and continued well into the postoperative period is effective in attenuating peripheral and central sensitization. Pharmacologic agents such as NSAIDs (non-steroidal anti-inflammatory drugs) opioids, and NMDA (N-methyl-D-aspartate) - and alpha-2-receptor antagonists, especially when used in combination, act synergistically to decrease postoperative pain. CONCLUSION: The variable patient characteristics and timing of preemptive analgesia in relation to surgical noxious input requires individualization of the technique(s) chosen. Multi-modal analgesic techniques appear most effective.

  4. Analgesia epidural para el trabajo de parto en gestante con esclerosis múltiple Epidural analgesia during labour of a patient with multiple sclerosis

    Directory of Open Access Journals (Sweden)

    M.J. Mayorga Buiza

    2010-07-01

    Full Text Available La Esclerosis Múltiple (EM, es una enfermedad del SNC siendo 2 veces más frecuente su aparición en mujeres, el 70% de ellas en edad fértil. Desde el punto de vista anestésico nos encontramos ante una enfermedad con elevada susceptibilidad neurológica que podría agravarse tanto por la propia cirugía, la técnica anestésica como por la medicación utilizada. Por otra parte se plantea como atender la demanda de analgesia para el trabajo de parto en mujeres con EM, que es el grupo de edad con mayor incidencia de la enfermedad. Presentamos el caso de una mujer de 37 años diagnosticada de esclerosis múltiples 3 años antes, forma recidivante, remitente. La paciente es ingresada en dilatación con 37 semanas de amenorrea, presentando una buena evolución del trabajo de parto y encontrándose el feto en situación longitudinal y presentación cefálica. Avisan al Servicio de Anestesia para valoración de la indicación de epidural para analgesia del parto. La gestante previamente había acudido a consulta de preanestesia donde se le había informado del riesgo beneficio de la técnica y en concreto en su caso, habiendo entendido perfectamente las posibles complicaciones derivadas de la misma y firmado el consentimiento informado. Nosotros hemos preferido utilizar una técnica locoregional, vía epidural considerando también el riesgo potencial de cesárea urgente, para evitar, dado el caso la realización de una técnica intraraquídea o una anestesia general, con las posibilidades de desencadenar un brote que tienen estas técnicas. Además de aportar confort a la paciente durante el trabajo de parto, proporcionar analgesia durante el mismo, disminuye por este motivo el estrés de la gestante pudiendo paralelamente evitar la aparición de un brote.Multiple sclerosis (MS is a disease of the central nervous system (CNS, and twice as prevalent in women, 70% of whom are of fertile age. From an anaesthetics point of view, due to it being a

  5. A randomized, controlled trial comparing local infiltration analgesia with epidural infusion for total knee arthroplasty

    DEFF Research Database (Denmark)

    Andersen, Karen Vestergaard; Bak, Marie; Christensen, Birgitte Viebæk; Harazuk, Jørgen; Pedersen, Niels A; Søballe, Kjeld

    2010-01-01

    There have been few studies describing wound infiltration with additional intraarticular administration of multimodal analgesia for total knee arthroplasty (TKA). In this study, we assessed the efficacy of wound infiltration combined with intraarticular regional analgesia with epidural infusion on...

  6. Prediction of Hypertension Incidence Rate Based on PCA-ARIMA Model%基于PCA-ARIMA模型的高血压发病率预测

    Institute of Scientific and Technical Information of China (English)

    马亮亮

    2013-01-01

    目的 高血压发病率是政府和相关医学工作者预防和监测高血压的重要依据之一.方法 利用主成分分析(principal component analysis,PCA)对因子进行线性筛选,获得保留因子后利用ARIMA进行建模预测,即为PCA-ARIMA多维时间序列组合预测模型.结果 高血压发病率的拟合与独立预测结果表明,PCA-ARIMA优于PCA-MLR、ARIMA等参比模型.结论 本文提出的基于主成分分析和ARIMA模型(PCA-ARIMA模型)的建模有助于提高模型的预测精度.

  7. Sedação e analgesia em terapia intensiva Sedación y analgesia en terapia intensiva Sedation and analgesia in intensive care

    Directory of Open Access Journals (Sweden)

    Fábio Ely Martins Benseñor

    2003-09-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: A ansiedade e a dor podem causar maior desconforto e risco aumentado de complicações no pós-operatório de pacientes cirúrgicos, prolongando inclusive seu tempo de internação. O objetivo deste estudo foi revisar os conceitos de sedação e analgesia em terapia intensiva, atualizando os conhecimentos e permitindo a revisão das informações disponíveis na literatura, assim como os consensos já publicados. CONTEÚDO: Apresentamos separadamente a sedação e analgesia, revisando cada grupo de fármacos disponível na prática clínica, suas características principais bem como seus efeitos colaterais mais importantes. Acrescentamos alguns protocolos utilizados em nossa UTI para analgesia e sedação, assim como as conclusões do último consenso do Colégio Americano de Medicina Intensiva e da Sociedade Americana de Terapia Intensiva. CONCLUSÕES: Apesar do grande arsenal terapêutico disponível na prática clínica, nota-se um grande desconhecimento das principais características dos fármacos utilizados para sedação e analgesia em terapia intensiva. Os consensos realizados tentam difundir as qualidades e efeitos colaterais dos fármacos mais utilizados, normatizando seu uso, tornando a analgesia e sedação realizadas nas UTI, procedimentos que beneficiem e recuperem mais rapidamente os pacientes.JUSTIFICATIVA Y OBJETIVOS: La ansiedad y el dolor pueden causar grande falta de comodidad y riesgo aumentado de complicaciones en el pos-operatorio de pacientes quirúrgicos, prolongando también su tiempo de internación. El objetivo de este estudio fue revisar los conceptos de sedación y analgesia en terapia intensiva, actualizando los conocimientos y permitiendo la revisión de las informaciones disponibles en la literatura, como también los consensos ya publicados. CONTENIDO: Presentamos separadamente la sedación y analgesia, revisando cada grupo de fármacos disponibles en la práctica clínica, sus

  8. Effects of Multimodal Analgesia on the Success of Mouse Embryo Transfer Surgery

    OpenAIRE

    Parker, John M.; Austin, Jamie; Wilkerson, James; Carbone, Larry

    2011-01-01

    Multimodal analgesia is promoted as the best practice pain management for invasive animal research procedures. Universal acceptance and incorporation of multimodal analgesia requires assessing potential effects on study outcome. The focus of this study was to assess effects on embryo survival after multimodal analgesia comprising an opioid and nonsteroidal antiinflammatory drug (NSAID) compared with opioid-only analgesia during embryo transfer procedures in transgenic mouse production. Mice w...

  9. Multimodal Analgesia in the Hip Fracture Patient.

    Science.gov (United States)

    Fabi, David W

    2016-05-01

    Hip fracture is one of the most common injuries among the elderly and, because the population is aging, it is expected to remain a major clinical challenge and public health problem for the foreseeable future. The clinical importance of early mobilization and prompt participation in physical therapy after hip fracture surgery is now widely recognized. Because postoperative pain can impair mobility and delay physical therapy, much attention is now being paid to finding more effective ways of controlling pain after hip fracture. Oversedation with opioid drugs inhibits communication between the patient and the health care team, can delay ambulation and rehabilitation therapy, and may increase the probability of the patient requiring a skilled nursing facility, which adds further cost to the overall health care system. Multiple pain pathways contribute to the perception of postoperative pain, and although opioids are highly effective in blocking nociceptive pain through inhibition of the mu receptors, they do not block other pain pathways. Multimodal analgesia involves the use of several anesthetic and analgesic modalities that are strategically combined to block pain perception at different sites in the peripheral and central nervous systems. This balanced, multifaceted approach provides more effective control of postoperative pain than opioid drugs alone, allows lower doses of opioids to be used as part of the multimodal regimen (thereby reducing the risk of opioid-related adverse events and complications), and may facilitate more rapid recovery and improve certain outcome measures related to recovery time. One prospective randomized study evaluating the clinical value of multimodal pain management in elderly patients undergoing bipolar hip hemiarthroplasty found that a multimodal regimen, including preemptive pain medication and intraoperative periarticular injections, reduced pain on postoperative days 1 and 4, and reduced overall opioid use. This article describes

  10. Potentiation of morphine analgesia by subanesthetic doses of pentobarbital.

    Science.gov (United States)

    Pontani, R B; Vadlamani, N L; Misra, A L

    1985-03-01

    Pentobarbital pretreatment reportedly either inhibits, enhances or has no effect on morphine analgesia. The effect of subanesthetic doses of sodium pentobarbital (8-12 mg kg-1, SC) delivered via a delivery system on analgesia of morphine (5 mg kg-1, SC or 1 mg kg-1, IV) acutely administered 45 min after the sodium pentobarbital pellet implantation was assessed using the warm water (55 degrees C)-induced tail-withdrawal reflex in male Wistar rats. Significant potentiation of morphine analgesia was observed in sodium pentobarbital as compared to the placebo-pelleted animals. Pharmacokinetic or dispositional factors were not involved in this potentiation, which was possibly due to the activation of the descending inhibitory control pathways of nociceptive spinal tail-withdrawal reflex by a combined interaction of two drugs at spinal and supraspinal sites of action, that mediate opiate antinociception. PMID:3991755

  11. The neuroanatomy of sexual dimorphism in opioid analgesia.

    Science.gov (United States)

    Loyd, Dayna R; Murphy, Anne Z

    2014-09-01

    The influence of sex has been neglected in clinical studies on pain and analgesia, with the vast majority of research conducted exclusively in males. However, both preclinical and clinical studies indicate that males and females differ in both the anatomical and physiological composition of central nervous system circuits that are involved in pain processing and analgesia. These differences influence not only the response to noxious stimuli, but also the ability of pharmacological agents to modify this response. Morphine is the most widely prescribed opiate for the alleviation of persistent pain in the clinic; however, it is becoming increasingly clear that morphine is less potent in women compared to men. This review highlights recent research identifying neuroanatomical and physiological dimorphisms underlying sex differences in pain and opioid analgesia, focusing on the endogenous descending pain modulatory circuit. PMID:24731947

  12. Balanced analgesia: what is it and what are its advantages in postoperative pain?

    DEFF Research Database (Denmark)

    Kehlet, H; Werner, M; Perkins, F

    1999-01-01

    The concept of balanced analgesia was introduced to improve analgesic efficacy and reduce adverse effects. A large amount of clinical data has documented improved analgesia by combining different analgesics, but data on reducing adverse effects are inconclusive. Balanced analgesia should be used ...

  13. Comparison of palonosetron with ondansetron in prevention of postoperative nausea and vomiting in patients receiving intravenous patient-controlled analgesia after gynecological laparoscopic surgery

    Science.gov (United States)

    Moon, Soo Yeong; Song, Dong Un; Lee, Ki Hyun; Song, Jae Wook; Kwon, Young Eun

    2013-01-01

    Background Postoperative nausea and vomiting (PONV) are common complications after anesthesia and surgery. This study was designed to compare the effects of palonosetron and ondansetron in preventing PONV in high-risk patients receiving intravenous opioid-based patient-controlled analgesia (IV-PCA) after gynecological laparoscopic surgery. Methods One hundred non-smoking female patients scheduled for gynecological laparoscopic surgery were randomly assigned into the palonosetron group (n = 50) or the ondansetron group (n = 50). Palonosetron 0.075 mg was injected as a bolus in the palonosetron group. Ondansetron 8 mg was injected as a bolus and 16 mg was added to the IV-PCA in the ondansetron group. The incidences of nausea, vomiting and side effects was recorded at 2 h, 24 h, 48 h and 72 h, postoperatively. Results There were no significant differences between the groups in the incidence of PONV during 72 h after operation. However, the incidence of vomiting was lower in the palonosetron group than in the ondansetron group (18% vs. 4%, P = 0.025). No differences were observed in use of antiemetics and the side effects between the groups. Conclusions The effects of palonosetron and ondansetron in preventing PONV were similar in high-risk patients undergoing gynecological laparoscopic surgery and receiving opioid-based IV-PCA. PMID:23459499

  14. DISTRIBUTION CHANNELS SELECTION USING PCA-DEA APPROACH

    Directory of Open Access Journals (Sweden)

    Milan Andrejić

    2015-03-01

    Full Text Available Strategic decision making is very important in logistics. One of the most important strategic decisions in logistics is the selection of distribution channels. This paper proposes the efficiency of distribution channels as one of the main selection criteria. The efficiency of distribution channels simultaneously affects logistics costs and customer satisfaction. Based on the main characteristics of the distribution channels, such as delivery time, service level, volume of business, the level of errors and the different cost categories in this paper the PCA-DEA approach for measuring the efficiency and selection of certain types of distribution channels is proposed. Model is tested on the numerical example. Results show the great capability of the proposed model.

  15. REAL TIME FACE RECOGNITION USING ADABOOST IMPROVED FAST PCA ALGORITHM

    Directory of Open Access Journals (Sweden)

    K. Susheel Kumar

    2011-08-01

    Full Text Available This paper presents an automated system for human face recognition in a real time background world fora large homemade dataset of persons face. The task is very difficult as the real time backgroundsubtraction in an image is still a challenge. Addition to this there is a huge variation in human face imagein terms of size, pose and expression. The system proposed collapses most of this variance. To detect realtime human face AdaBoost with Haar cascade is used and a simple fast PCA and LDA is used torecognize the faces detected. The matched face is then used to mark attendance in the laboratory, in ourcase. This biometric system is a real time attendance system based on the human face recognition with asimple and fast algorithms and gaining a high accuracy rate..

  16. Report on the PCaPAC 2000 Workshop

    CERN Document Server

    Bacher, R

    2001-01-01

    In October 2000, the third PCaPAC (PCs and Particle Accelerator Controls) workshop took place at DESY. This paper presents a summary of the workshop. The workshop reviewed existing and new PC-based accelerator control systems, from small-scale to large-scale installations. It demonstrated convincingly the advantage of modern, commercial mass-market products used for accelerator controls. Disadvantages of these technologies were reported as well. Large-scale PC systems inherently bring administrative concerns into the picture. In this vein, special emphasis was given to system administration for distributed systems. A major topic of the workshop was the integration of different control system approaches as well as the integration of different platforms within the same control system. In particular, PC-based concepts offer the simple opportunity to interface to commercial SCADA systems. In addition, large emphasis was given to the presentation of future developments including the next network trends to data exc...

  17. Does epidural clonidine improve postoperative analgesia in major vascular surgery?

    Directory of Open Access Journals (Sweden)

    Jelena Vuković

    2012-02-01

    Full Text Available Aim To determine the quality and duration of the analgesic and haemodynamic effects of clonidine when used as an additional analgesic for postoperative epidural analgesia in major vascularsurgery. Methods The prospective, single-blinded study involved 60 patients randomised into three groups (20 patients each: Group BM—bupivacaine 0.125% and morphine 0.1 mg/ml; Group BC—bupivacaine 0.125% and clonidine 5 μg/ml; Group MC—morphine 0.1 mg/ml and clonidine 5 μg/ml continuously infused at 5 ml/h. The quality and duration of the analgesia measured by the Visual Analogue Scale (VAS at rest and on movement, additional analgesia requirements, sedation scores, haemodynamic parameters and side effects(respiratory depression, motor block, toxic effects, nausea and pruritus were recorded. Results The average VAS scores at rest and on movement were significantly lower in Group MC at two, six and 24 hours following the start of epidural infusion (P<0.05. The duration of the analgesic effect after finishing the epidural infusion was significantly longer in Group MC (P<0.05. Patients from Group MC were intubated longer. Additional analgesia consumption, sedation scoresand haemodynamic profiles were similar in all three groups. Prurituswas more frequent in morphine groups (P<0.05, but other sideeffects were similar in all three groups.Conclusion Under study conditions, clonidine added to morphine,not 0.125% bupivacaine, provided significantly better pain scoresat two, six and 24 hours following the start of epidural infusionand the longest-lasting analgesia following the discontinuationof epidural infusion. However, patients from the Group MC weremechanically ventilated longer than patients from other two groups.Continuous monitoring of the patient is necessary after theadministration of clonidine for epidural analgesia.

  18. DHEA administration modulates stress-induced analgesia in rats.

    Science.gov (United States)

    Cecconello, Ana Lúcia; Torres, Iraci L S; Oliveira, Carla; Zanini, Priscila; Niches, Gabriela; Ribeiro, Maria Flávia Marques

    2016-04-01

    An important aspect of adaptive stress response is the pain response suppression that occurs during or following stress exposure, which is often referred to as acute stress-induced analgesia. Dehydroepiandrosterone (DHEA) participates in the modulation of adaptive stress response, changing the HPA axis activity. The effect of DHEA on the HPA axis activity is dependent on the state and uses the same systems that participate in the regulation of acute stress-induced analgesia. The impact of DHEA on nociception has been studied; however, the effect of DHEA on stress-induced analgesia is not known. Thus, the aim of the present study was to evaluate the effect of DHEA on stress-induced analgesia and determine the best time for hormone administration in relation to exposure to stressor stimulus. The animals were stressed by restraint for 1h in a single exposure and received treatment with DHEA by a single injection before the stress or a single injection after the stress. Nociception was assessed with a tail-flick apparatus. Serum corticosterone levels were measured. DHEA administered before exposure to stress prolonged the acute stress-induced analgesia. This effect was not observed when the DHEA was administered after the stress. DHEA treatment in non-stressed rats did not alter the nociceptive threshold, suggesting that the DHEA effect on nociception is state-dependent. The injection of DHEA had the same effect as exposure to acute stress, with both increasing the levels of corticosterone. In conclusion, acute treatment with DHEA mimics the response to acute stress indexed by an increase in activity of the HPA axis. The treatment with DHEA before stress exposure may facilitate adaptive stress response, prolonging acute stress-induced analgesia, which may be a therapeutic strategy of interest to clinics. PMID:26852948

  19. Cost effectiveness analysis of screening in the early diagnosis of prostate cancer (PCA)

    International Nuclear Information System (INIS)

    Purpose. The authors attempted to provide an overview of current concepts and the status of research in the field of cost effectiveness analysis (CEA) of screening for prostate cancer (PCA).Material and methods. Basic concepts and methods of CEA were reviewed. Examples of CEA-related studies of PCA were obtained from pertinent literature through medical databases.Results. Screening for PCA has so far been restricted to limited groups of health care recipients, usually within the framework of clinical trials. In those trials, screening for PCA usually results in higher numbers of PCAs being detected at lower average stages in a given population. As a consequence of screening, the rate of potentially curable PCAs increases. However, it has not yet been demonstrated that screening for PCA decreases PCA-related mortality or morbidity from metastatic PCA. On the other hand, additional costs are associated with the screening measure and with increased use of resources for diagnosis and treatment of the additional PCAs detected through screening.Conclusions. Throughout the European Union and North America, mass screening for PCA has not been implemented. This may chiefly be due to the current lack of information on long term benefits of PCA screening, particularly disease-specific survival. Currently, major studies are underway to assess the effects of PCA screening and its cost effectiveness. These studies include the US-American prostate, lung, colon and ovary trials (PLCO) and the European randomised study of Screening for Prostate Cancer (ERSPC). (orig.)

  20. Stellate ganglion blockade for analgesia following upper limb surgery.

    LENUS (Irish Health Repository)

    McDonnell, J G

    2012-01-31

    We report the successful use of a stellate ganglion block as part of a multi-modal postoperative analgesic regimen. Four patients scheduled for orthopaedic surgery following upper limb trauma underwent blockade of the stellate ganglion pre-operatively under ultrasound guidance. Patients reported excellent postoperative analgesia, with postoperative VAS pain scores between 0 and 2, and consumption of morphine in the first 24 h ranging from 0 to 14 mg. While these are preliminary findings, and must be confirmed in a clinical trial, they highlight the potential for stellate ganglion blockade to provide analgesia following major upper limb surgery.

  1. 硬膜外分娩镇痛联合心理干预对产妇焦虑抑郁情绪的影响%Effect of Psychological Intervention Combined with Epidural Labor Analgesia on the Anxiety and Depression of Parturients

    Institute of Scientific and Technical Information of China (English)

    潘麒; 孙立红

    2011-01-01

    [Objective] To explore the effect of psychological intervention combined with epidural labor analgesia on the anxiety and depression of parturients. [Methods]Totally 160 primiparas without relevant contraindication were divided into two groups with 80 in each. Group P was given psychological intervention (gradual muscle relaxation and abdominal respiration) combined with epidural labor analgesia. Group R was given epidural labor analgesia. The analgesia effect(VAS) , the dosage of patient controlled analgesia(PCA) , self rating anxiety scale(SAS) and self rating depression scale(SDS) were compared between two groups. [Results]The VAS score and the dosage of PCA, SAS and SDS scores of first, second and third labor stages in Group P were lower than those in Group R. [Conclusion]Psychological intervention combined epidural labor analgesia for the labor can markedly improve mental state of parturients, and has certain analgesia effect, and is helpful to increase the quality in perinatal period.%[目的]探讨硬膜外分娩镇痛联合心理干预对产妇焦虑抑郁情绪的影响.[方法]160例无相关禁忌的初产妇,随机分成两组,每组80例.P组为硬膜外分娩镇痛联合心理干预(渐进性肌肉放松法和腹式呼吸法)、R组为硬膜外分娩镇痛.比较两组镇痛效果(VAS)、病人自控镇痛(PCA)用药量、焦虑自评量表(SAS)和抑郁自评量表(SDS)评分.[结果]第一产程潜伏期、活跃期和第二产程、第三产程VAS评分、PCA用药量、SAS和SDS评分均P组低于R组.[结论]硬膜外分娩镇痛联合心理干预用于分娩期,能显著改善产妇的心理状态,镇痛效果确切,有助于提高围生期质量.

  2. Analgesia pós-operatória para cesariana: a adição de clonidina à morfina subaracnóidea melhora a qualidade da analgesia? Analgesia postoperatória para cesárea: ¿la adición de clonidina a la morfina subaracnoidea mejora la calidad de la analgesia? Postoperative analgesia for cesarean section: does the addiction of clonidine to subarachnoid morphine improve the quality of the analgesia?

    Directory of Open Access Journals (Sweden)

    José Francisco Nunes Pereira das Neves

    2006-08-01

    ína hiperbárica a 0,5% (12,5 mg, morfina (100 µg y clonidina (15 µg y BM30 - bupivacaína hiperbárica a 0,5% (12,5 mg, morfina (100 µg y clonidina (30 µg, administradas separadamente. En el perioperatorio, fueron anotados el consumo de efedrina y la evaluación del recién nacido por el índice de Apgar. En el postoperatório, el dolor se evaluó en la 12ª hora por la Escala Analógica Visual, el tiempo para la solicitación de analgésicos y efectos colaterales postoperatórios, como comezón, náuseas, vómitos, bradicardia, hipotensión arterial y sedación. Los valores fueron considerados significativos cuando p BACKGROUND AND OBJECTIVES: The mechanism of action of alpha2-adrenergic analgesia has been explored for more than one hundred years. The increased duration of the sensitive and motor blockades caused by clonidine is dose-dependent and has antinociceptive properties. The objective of this study was to evaluate whether the addition of 15 to 30 µg of clonidine to spinal anesthesia for cesarean sections with 0.5% hyperbaric bupivacaine (12.5 mg and morphine (100 µg improves the quality of postoperative analgesia. METHODS: We realized a prospective, randomized study that included 60 patients divided in 3 groups: BM - 0.5% hyperbaric bupivacaine (12.5 mg and morphine (100 µg, BM15 - 0.5% hyperbaric bupivacaine (12.5 mg, morphine (100 µg, and clonidine (15 mg, and BM30 - 0.5% hyperbaric bupivacaine (12.5 mg, morphine (100 µg, and clonidine (30 µg, administered separately. In the perioperative period the use of ephedrine and the newborn's Apgar score were recorded. In the postoperative period, the pain was evaluated in the 12th h by the VAS, the length of time it took the patient to ask for analgesics, and the postoperative side effects, such as pruritus, nausea, vomiting, bradycardia, hypotension, and sedation. The values were considered significant when p < 0.05. RESULTS: The groups were homogenous. The use of ephedrine and the evaluation by the Apgar

  3. Analgesia postoperatoria tras artroplastia de rodilla mediante bloqueo femoral continuo con ropivacaína Postoperative analgesia after knee arthroplasty through continuous femoral blockage with ropivacaine

    Directory of Open Access Journals (Sweden)

    M. Reina

    2004-02-01

    Full Text Available Introducción: El objetivo del estudio es conocer el grado de dolor y satisfacción en el postoperatorio de los pacientes que han recibido analgesia mediante bloqueo femoral continuo en artroplastia total de rodilla. Material y método: Se incluyeron pacientes ASA I-III diagnosticados de gonartrosis e intervenidos de artroplastia total de rodilla bajo anestesia intradural. En la Sala de Despertar y bajo los efectos residuales de la anestesia intradural se colocó un catéter en la proximidad del nervio femoral, con neuroestimulación. Se administró un bolo inicial de ropivacaína 0,375% 30 ml, seguido de una perfusión continua de ropivacaína 0,125% 10 ml.h-1, que se mantuvo durante las primeras 48 horas del postoperatorio. Las variables registradas fueron las siguientes: dolor postoperatorio a las 24 y 48 horas mediante EVA, localización del dolor, existencia o no de bloqueo motor, parestesias-disestesias y efectos secundarios, así como fármacos utilizados en caso de analgesia insuficiente, dificultad de la técnica y grado de satisfacción a las 48 horas. Resultados: Se incluyeron 8 pacientes, con peso y altura media de 78 kg y 157 cm respectivamente. El análisis del dolor registrado a las 24 horas fue en un 62,5% de EVA 0, en un 25% EVA 5 y en un 12,5% EVA 6. A las 48 horas el 87,5% de los pacientes tenían un EVA 0 y un 12,5% EVA 4. Todos los pacientes con dolor lo localizaron en hueco poplíteo. En ningún caso hubo bloqueo motor. El 25% presentaron parestesias a las 24-48 horas y el 12,5% episodio de náuseas. En caso de analgesia insuficiente se complementó el tratamiento con AINE intravenosos y en un caso con bloqueo del nervio ciático por abordaje anterior. La técnica realizada resultó fácil en el 87,5% de los pacientes y muy difícil en el 12,5%. El grado de satisfacción fue superior a 7 en todos los pacientes. Conclusiones: El bloqueo 3 en 1 continuo en nuestra serie, proporcionó una analgesia eficaz en pacientes

  4. Comparison of two robust PCA methods for damage detection in the presence of outliers

    OpenAIRE

    Gharibnezhad, Fahit; Mujica Delgado, Luis Eduardo; Rodellar Benedé, José

    2011-01-01

    Statistical methods such as Principal Component Analysis (PCA) are suffering from contaminated data. For instance, variance and covariance as vital parts of PCA method are sensitive to anomalous observation called outliers. Outliers, who are usually, appear due to experimental errors, are observations that lie at a considerable distance from the bulk of the observations. An effective way to deal with this problem is to apply a robust, i.e. not sensitive to outliers, variant of PCA. In this wo...

  5. Analgesia and sedation for children undergoing burn wound care.

    Science.gov (United States)

    Bayat, Ahmad; Ramaiah, Ramesh; Bhananker, Sanjay M

    2010-11-01

    Standard care of burn wounds consists of cleaning and debridement (removing devitalized tissue), followed by daily dressing changes. Children with burns undergo multiple, painful and anxiety-provoking procedures during wound care and rehabilitation. The goal of procedural sedation is safe and efficacious management of pain and emotional distress, requiring a careful and systematic approach. Achieving the best results needs understanding of the mechanisms of pain and the physiologic changes in burn patients, frequent evaluation and assessment of pain and anxiety, and administration of suitable pharmacological and nonpharmacological therapies. Pharmacological therapies provide the backbone of analgesia and sedation for procedural pain management. Opioids provide excellent pain control, but they must be administered judiciously due to their side effects. Sedative drugs, such as benzodiazepines and propofol, provide excellent sedation, but they must not be used as a substitute for analgesic drugs. Ketamine is increasingly used for analgesia and sedation in children as a single agent or an adjuvant. Nonpharmacological therapies such as virtual reality, relaxation, cartoon viewing, music, massage and hypnosis are necessary components of procedural sedation and analgesia for children. These can be combined with pharmacological techniques and are used to limit the use of drugs (and hence side effects), as well as to improve patient participation and satisfaction. In this article, we review the pathophysiologic changes associated with major thermal injury in children, the options available for sedation and analgesia for wound care procedures in these children and our institutional guidelines for procedural sedation. PMID:20977331

  6. Liposomal extended-release bupivacaine for postsurgical analgesia

    Directory of Open Access Journals (Sweden)

    Lambrechts M

    2013-09-01

    Full Text Available Mark Lambrechts,1,2 Michael J O’Brien,2 Felix H Savoie,2 Zongbing You1–31Department of Structural and Cellular Biology, 2Department of Orthopaedic Surgery and Tulane Institute of Sports Medicine, 3Tulane Cancer Center, Louisiana Cancer Research Consortium, Tulane Center for Aging, Tulane Center for Stem Cell Research and Regenerative Medicine, Tulane University School of Medicine, New Orleans, Louisiana, USAAbstract: When physicians consider which analgesia to use postsurgery, the primary goal is to relieve pain with minimal adverse side effects. Bupivacaine, a commonly used analgesic, has been formulated into an aqueous suspension of multivesicular liposomes that provide long-lasting analgesia for up to 72 hours, while avoiding the adverse side effects of opioids. The increased efficacy of liposomal extended-release bupivacaine, compared to bupivacaine hydrochloride, has promoted its usage in a variety of surgeries including hemorrhoidectomy, bunionectomy, inguinal hernia repair, total knee arthroplasty, and augmentation mammoplasty. However, like other bupivacaine formulations, the liposomal extended-release bupivacaine does have some side effects. In this brief review, we provide an update of the current knowledge in the use of bupivacaine for postsurgical analgesia. Keywords: bupivacaine, liposome, analgesia, side effects, efficacy, patient satisfaction

  7. Epidural morphine analgesia in Guillain Barré syndrome.

    OpenAIRE

    Genis, D; Busquets, C; Manubens, E; Dávalos, A; Baró, J; Oterino, A

    1989-01-01

    Severe pain is a frequent symptom in the Guillain Barré syndrome and can be intense, long lasting and with no response to the usual analgesics, including parenteral opiates. Epidural analgesia using morphine chloride in low doses has satisfactorily relieved pain in this disease in nine patients.

  8. Effect of irradiation on analgesia induced by morphine and endorphin

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Jin Kyu; Lee, Byoung Hun; Hyun, Soung Hee; Chung, Ki Myung [KAERI, Daejeon (Korea, Republic of)

    2003-07-01

    Morphine and endorphin administered intracerebroventricularly (i.c.v.) produce analgesia by activating different descending pain inhibitory systems. Gamma irradiation attenuates the acute analgesic action of i.c.v. injected morphine in mice. This study was done to investigate the effect of-irradiation on the analgesia produced by i.c.v. injected morphine and endorphin in male ICR mice. In one group, mice were exposed to whole-body irradiation at a dose of 5 Gy from a {sup 60}Co source and the analgesic effects were tested 5, 30, 60, 90 and 180 min after irradiation using the acetic acid-induced writhing test. The analgesic effect was produced time-dependently and reached its maximum at 90 min after irradiation. Thus, time was fixed in the following studies. In another group, mice were irradiated with 5 Gy and tested 90 minutes later for analgesia produced by i.c.v. administration of morphine or endorphin. Irradiation significantly potentiated the analgesia produced by endorphin. However, the antinociception produced by morphine was not affected by irradiation. These results support the hypothesis that morphine and endorphin administered supraspinally produce antinocieception by different neuronal mechanisms.

  9. Effect of irradiation on analgesia induced by morphine and endorphin

    International Nuclear Information System (INIS)

    Morphine and endorphin administered intracerebroventricularly (i.c.v.) produce analgesia by activating different descending pain inhibitory systems. Gamma irradiation attenuates the acute analgesic action of i.c.v. injected morphine in mice. This study was done to investigate the effect of-irradiation on the analgesia produced by i.c.v. injected morphine and endorphin in male ICR mice. In one group, mice were exposed to whole-body irradiation at a dose of 5 Gy from a 60Co source and the analgesic effects were tested 5, 30, 60, 90 and 180 min after irradiation using the acetic acid-induced writhing test. The analgesic effect was produced time-dependently and reached its maximum at 90 min after irradiation. Thus, time was fixed in the following studies. In another group, mice were irradiated with 5 Gy and tested 90 minutes later for analgesia produced by i.c.v. administration of morphine or endorphin. Irradiation significantly potentiated the analgesia produced by endorphin. However, the antinociception produced by morphine was not affected by irradiation. These results support the hypothesis that morphine and endorphin administered supraspinally produce antinocieception by different neuronal mechanisms

  10. Multimodal analgesia for perioperative pain in three cats.

    Science.gov (United States)

    Steagall, Paulo V M; Monteiro-Steagall, Beatriz P

    2013-08-01

    Adequate pain relief is usually achieved with the simultaneous use of two or more different classes of analgesics, often called multimodal analgesia. The purpose of this article is to highlight the use of perioperative multimodal analgesia and the need to individualize the treatment plan based on the presenting condition, and to adjust it based on the response to analgesia for a given patient. This case series presents the alleviation of acute pain in three cats undergoing different major surgical procedures. These cases involved the administration of different classes of analgesic drugs, including opioids, non-steroidal anti-inflammatory drugs, tramadol, ketamine, gabapentin and local anesthetics. The rationale for the administration of analgesic drugs is discussed herein. Each case presented a particular challenge owing to the different cause, severity, duration and location of pain. Pain management is a challenging, but essential, component of feline practice: multimodal analgesia may minimize stress while controlling acute perioperative pain. Individual response to therapy is a key component of pain relief in cats. PMID:23382595

  11. PCA-based groupwise image registration for quantitative MRI.

    Science.gov (United States)

    Huizinga, W; Poot, D H J; Guyader, J-M; Klaassen, R; Coolen, B F; van Kranenburg, M; van Geuns, R J M; Uitterdijk, A; Polfliet, M; Vandemeulebroucke, J; Leemans, A; Niessen, W J; Klein, S

    2016-04-01

    Quantitative magnetic resonance imaging (qMRI) is a technique for estimating quantitative tissue properties, such as the T1 and T2 relaxation times, apparent diffusion coefficient (ADC), and various perfusion measures. This estimation is achieved by acquiring multiple images with different acquisition parameters (or at multiple time points after injection of a contrast agent) and by fitting a qMRI signal model to the image intensities. Image registration is often necessary to compensate for misalignments due to subject motion and/or geometric distortions caused by the acquisition. However, large differences in image appearance make accurate image registration challenging. In this work, we propose a groupwise image registration method for compensating misalignment in qMRI. The groupwise formulation of the method eliminates the requirement of choosing a reference image, thus avoiding a registration bias. The method minimizes a cost function that is based on principal component analysis (PCA), exploiting the fact that intensity changes in qMRI can be described by a low-dimensional signal model, but not requiring knowledge on the specific acquisition model. The method was evaluated on 4D CT data of the lungs, and both real and synthetic images of five different qMRI applications: T1 mapping in a porcine heart, combined T1 and T2 mapping in carotid arteries, ADC mapping in the abdomen, diffusion tensor mapping in the brain, and dynamic contrast-enhanced mapping in the abdomen. Each application is based on a different acquisition model. The method is compared to a mutual information-based pairwise registration method and four other state-of-the-art groupwise registration methods. Registration accuracy is evaluated in terms of the precision of the estimated qMRI parameters, overlap of segmented structures, distance between corresponding landmarks, and smoothness of the deformation. In all qMRI applications the proposed method performed better than or equally well as

  12. Analgesia de parto: estudo comparativo entre anestesia combinada raquiperidural versus anestesia peridural contínua Analgesia de parto: estudio comparativo entre anestesia combinada raqui-peridural versus anestesia peridural continua Labor analgesia: a comparative study between combined spinal-epidural anesthesia versus continuous epidural anesthesia

    Directory of Open Access Journals (Sweden)

    Carlos Alberto de Figueiredo Côrtes

    2007-02-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: O alívio da dor no trabalho de parto tem recebido atenção constante visando ao bem-estar materno, diminuindo o estresse causado pela dor e reduzindo as conseqüências deste sobre o concepto. Inúmeras técnicas podem ser utilizadas para analgesia de parto. Este trabalho teve como objetivo comparar a técnica peridural contínua com a combinada, ambas com o uso de bupivacaína a 0,25% em excesso enantiomérico 50% e fentanil como agentes. MÉTODO: Participaram do estudo 40 parturientes em trabalho de parto com dilatação cervical entre 4 e 5 cm que foram distribuídas em dois grupos iguais de forma aleatória. O Grupo I recebeu anestesia peridural contínua. O Grupo II recebeu anestesia combinada. Foram avaliados: medidas antropométricas, idade gestacional, dilatação cervical, tempo entre o bloqueio e a ausência de dor por meio da escala analógica visual, possibilidade de deambulação, tempo entre o início da analgesia e a dilatação cervical completa, duração do período expulsivo, parâmetros hemodinâmicos maternos e vitalidade do recém-nascido. Possíveis complicações, como depressão respiratória, hipotensão arterial materna, prurido, náuseas e vômitos, também foram observadas. Para a comparação das médias utilizou-se o teste t de Student e para a paridade e tipo de parto utilizou-se o teste do Qui-quadrado. RESULTADOS: Não houve diferença estatística significativa entre os dois grupos em relação ao tempo entre o início da analgesia e a dilatação cervical completa, bem como em relação ao tempo da duração do período expulsivo, incidência de cesariana relacionada com a analgesia, parâmetros hemodinâmicos maternos e vitalidade do recém-nascido. CONCLUSÕES: Ambas as técnicas se mostraram eficazes e seguras para a analgesia do trabalho de parto, embora a técnica combinada tenha proporcionado um rápido e imediato alívio da dor. Estudos clínicos com maior número de casos s

  13. Epidural analgesia practices for labour: results of a 2005 national survey in Ireland.

    LENUS (Irish Health Repository)

    Fanning, Rebecca A

    2012-02-01

    BACKGROUND AND OBJECTIVE: The last 25 years have seen changes in the management of epidural analgesia for labour, including the advent of low-dose epidural analgesia, the development of new local anaesthetic agents, various regimes for maintaining epidural analgesia and the practice of combined spinal-epidural analgesia. We conducted a survey of Irish obstetric anaesthetists to obtain information regarding the conduct and management of obstetric epidural analgesia in Ireland in 2005. The specific objective of this survey was to discover whether new developments in obstetric anaesthesia have been incorporated into clinical practice. METHODS: A postal survey was sent to all anaesthetists with a clinical commitment for obstetric anaesthesia in the sites approved for training by the College of Anaesthetists, Ireland. RESULTS: Fifty-three per cent of anaesthetists surveyed responded. The majority of anaesthetists (98%) use low-dose epidural analgesia for the maintenance of analgesia. Only 11% use it for test-dosing and 32% for the induction of analgesia. The combined spinal-epidural analgesia method is used by 49%, but two-thirds of those who use it perform fewer than five per month. Patient-controlled epidural analgesia was in use at only one site. CONCLUSION: It appears that Irish obstetric anaesthetists have adopted the low-dose epidural analgesia trend for the maintenance of labour analgesia. This practice is not as widespread, however, for test dosing, the induction of analgesia dose or in the administration of intermittent epidural boluses to maintain analgesia when higher concentrations are used. Since its introduction in 2000, levobupivacaine has become the most popular local anaesthetic agent.

  14. New genomic structure for prostate cancer specific gene PCA3 within BMCC1: implications for prostate cancer detection and progression.

    Directory of Open Access Journals (Sweden)

    Raymond A Clarke

    Full Text Available BACKGROUND: The prostate cancer antigen 3 (PCA3/DD3 gene is a highly specific biomarker upregulated in prostate cancer (PCa. In order to understand the importance of PCA3 in PCa we investigated the organization and evolution of the PCA3 gene locus. METHODS/PRINCIPAL FINDINGS: We have employed cDNA synthesis, RTPCR and DNA sequencing to identify 4 new transcription start sites, 4 polyadenylation sites and 2 new differentially spliced exons in an extended form of PCA3. Primers designed from these novel PCA3 exons greatly improve RT-PCR based discrimination between PCa, PCa metastases and BPH specimens. Comparative genomic analyses demonstrated that PCA3 has only recently evolved in an anti-sense orientation within a second gene, BMCC1/PRUNE2. BMCC1 has been shown previously to interact with RhoA and RhoC, determinants of cellular transformation and metastasis, respectively. Using RT-PCR we demonstrated that the longer BMCC1-1 isoform - like PCA3 - is upregulated in PCa tissues and metastases and in PCa cell lines. Furthermore PCA3 and BMCC1-1 levels are responsive to dihydrotestosterone treatment. CONCLUSIONS/SIGNIFICANCE: Upregulation of two new PCA3 isoforms in PCa tissues improves discrimination between PCa and BPH. The functional relevance of this specificity is now of particular interest given PCA3's overlapping association with a second gene BMCC1, a regulator of Rho signalling. Upregulation of PCA3 and BMCC1 in PCa has potential for improved diagnosis.

  15. Opiodes como coadyuvantes de la analgesia epidural en pediatría Opioids as adjuvants of epidural analgesia in the paediatric age

    Directory of Open Access Journals (Sweden)

    M. A. Vidal

    2006-03-01

    Full Text Available Hay un elevado número de receptores opioides localizados en la sustancia gelatinosa del asta dorsal medular. La inyección epidural de opioides permite la unión de forma saturable y competitiva con estos receptores, con lo que se consigue analgesia y disminución del riesgo de efectos adversos asociados a la administración parenteral de los mismos. No obstante, es importante tener en cuenta los posibles efectos adversos que pueden aparecer, siendo la depresión respiratoria la complicación más importante. La morfina es el opioide agonista mu más utilizado para el tratamiento del dolor agudo o crónico y constituye el analgésico estándar con el que se comparan los nuevos analgésicos. El fentanilo es un agonista opioide derivado de la fenilpiperidina que posee una alta afinidad por los receptores mu, lo que le confiere una potencia analgésica 50-100 veces superior a la morfina. El tramadol es el más reciente de los opioides sintéticos empleados en España. Tiene baja afinidad por los receptores mu, Kappa y delta, no obstante su potencia analgésica respecto a la morfina es 1/10 por vía parenteral y 1/30 por vía espinal. Los opioides por vía epidural se han empleado ampliamente en adultos, pero con una frecuencia mucho menor en pediatría. En este artículo se repasan los distintos estudios que han evaluado sus efectos en pediatría, haciendo referencia a la farmacocinética, consideraciones clínicas y posibles efectos adversos tras la administración de morfina, fentanilo o tramadol por vía epidural.A large number of opioid receptors are located in the substantia gelatinosa of the medullar dorsal horn. Epidurally injected opioids bind with these receptors in a competitive and saturable manner causing analgesia and a lower risk of side effects as compared with its parenteral administration. However, its possible side effects, mainly respiratory depression, should be considered. Morphine is the mu agonist opioid most widely used for

  16. EFFECT OF INTRATHECAL CLONIDINE ON DURATION OF SPINAL ANALGESIA

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    Sourabh

    2015-06-01

    Full Text Available BACKGROUND: Clonidine is an α 2 adrenoreceptor agonist that has been shown to effectively prolong the duration of analgesia when administered intrathecally or in the epidural space along with local anaesthetic. AIMS AND OBJECTIVE: This study was designed to evaluate the effect of two different doses of intrathecal clonidine (37.5 μg and 75 μg on the duration of analgesia and side effects produced by hyperbaric bupivacaine 0.5%. MATERIALS AND METHODS : A prospective hospital based, randomized and double blind study. Selected 75 patients who was scheduled for elective below umbilical surgeries were randomly allocated to one of three groups. Group I (n=25, control group received 3ml hyperbaric bupivacaine, Group II (n=25 3ml hyperbar ic bupivacaine + 37.5 μg clonidine and Group III (n=25 3 ml hyperbaric bupivacaine + 75μg clonidine intrathecally. Total volume (4ml remained constant by adding sterile water. Data were analyzed by using SPSS software ver.18. RESULTS: The (mean ±SD dura tion of analgesia was found to be 171.3±6.37 mins in Group I, 217.7±7.01 mins in Group II and 257.1±6.50 mins in Group III (p<0.05. It shows that 37.5  g & 75  g intrathecal clonidine increases the duration of analgesia of 15mg hyperbaric bupivacaine by abo ut 46 mins & 86 mins respectively. The addition of intrathecal clonidine upto 75 μg does not cause any significant major side effect except mild sedation, without an increase in incidence of hypotension, bradycardia and respiratory depression. CONCLUSION: Intrathecal clonidine (37.5  g & 75  g as an adjuvant to hyperbaric bupivacaine 0.5% prolong the duration of analgesia in a dose dependent manner without increase in incidence of significant side effects

  17. Effect of epidural analgesia on labor and its outcomes

    International Nuclear Information System (INIS)

    Epidural analgesia is an effective and popular way to relieve labour pain but it may interfere with normal mechanism of labour. The objective of this study was to evaluate the outcome of labour in women with effective epidural analgesia in terms of duration of labour, mode of delivery and neonatal outcome. Methods: This was a quasi-experimental study conducted in the Department of Obstetrics and Gynaecology, Shaikh Zayed Federal Postgraduate Medical Institute and Hospital, Lahore. One hundred pregnant women were selected by non-probability convenient sampling method. Subjects were divided into two groups of 50 each as per convenience. Patients of any gravidity at term from 37-41 weeks were included in the sample. Epidural analgesia was applied to group B and distilled water to group A at the lumber region and the progress of labour, mode of delivery and effects on Apgar scores of neonates were evaluated. Out of hundred patients, 77 had normal duration of second stage while 23 had prolonged second stage. Among them, 18 patients (36%) were in epidural group and 5 patients (10%) in non-epidural group, while 4 patients (8%) in epidural group developed intra-partum complications; whereas among non-epidural group had such complications. 65 patients had spontaneous vaginal delivery while 35 patients had instrumental delivery. Among them 29 patients (58%) were in epidural group while only 6 patients (12%) were in non-epidural group. Babies born had Apgar score 5/10 (21.8%), 6/10 (59.4%) and 7/10 (17.8%) at 1 minute and 8/10 (74.3%) and 9/10 (24.8%) at 5 minutes in both groups and none of them needed bag and mask resuscitation. Conclusion: Epidural analgesia does prolong the duration of second stage of labour and increases the instrumental delivery rate. Neonatal outcome is satisfactory while only a few intra-partum complications are found with epidural analgesia. (author)

  18. PCA and Cluster Analysis for Criteria Mapping in Landfill Siting

    Directory of Open Access Journals (Sweden)

    Kaoutar BENNIS

    2014-10-01

    Full Text Available Landfill siting is of primordial interest in waste management. As the size of modern cities grows along with the shifts in demographics and composition of solid wastes, it has become important to choose the location of a waste disposal area in a way that insures long-term usability, environmental impact minimization and other considerations; these considerations can vary greatly among cases and from it follows that the criteria involved in siting a new landfill location should be subject to a conscientious and thorough choosing process. This work is a literature review focusing on criteria used in the siting of new landfills, it took advantage of the statistical methods of data mining in order to establish patterns; it can be viewed as a guide. Starting with collection of scoop-compatible articles, an extraction of criteria from each article is done which opens the door for analysis by Principal Component Analysis (PCA, Bivariate Correlation (BC and Cluster Analysis (CA. The corroborate use of this methods and the definition of the conceptual layers of category and supercategory fortifies the statistical significances of the results.

  19. Remifentanil combined with low-dose ketamine for post-operative analgesia of lower limb fracture: a double-blind, controlled study

    Institute of Scientific and Technical Information of China (English)

    DENG Gui-feng; ZHENG Jin-ping; WANG Song; TIAN Bin; ZHANG Shi-gang

    2009-01-01

    Objective: To investigate the adjuvant effect of intra-operative and postoperative low-dose ketamine administra-tion to remifentanil consumption in patient-controlled anal-gesia (PCA) for lower limb fracture.Methods: A total of 200 patients with lower limb frac-ture receiving the surgery were randomly divided into 4 groups. In Groups A, B and C, patients received 0.5 mg/kgketamine infusion under general anesthesia, and ketamine in a dose of 0.1 mg/kg, 0.05 mg/kg, 0.01 mg/kg per hour continuously for 24 hours after surgery, respectively. The control group (Group D) received an equivalent volume of normal saline only. With 20 μg/ml remifentanil in normal saline, postoperative PCA was administered with a back-ground infusion at 2 ml/h following 2 ml as a loading dose and 1 ml demand dose with a 3-minute lockout period. Remifentanil consumption, 11-point visual analog scale (VAS) scores, global satisfaction score (GSS), and side ef-fects were also recorded by the acute pain service. Results: Cumulative PCA remifentanil consumption in Groups A and B were (1378±377) μg and (1531±402) μg,significantly lower than (1807±510) μg and (1838±523) μg in Groups C and D (P<0.01). VAS scores in Groups A and B were significantly lower than those in Groups C and D (P<0.01). In the first 12 hours after operation, GSS was improved (P<0.01). No respiratory depression was observed. No significant dif-ference in side effects was observed among groups. Conclusion: Low-dose ketamine can relieve postop-erative pain and moderately decrease remifentanil consump-tion for PCA, with no obvious side effects of ketamine.

  20. Analgesia preemptiva nas cirurgias da coluna lombossacra: estudo prospectivo e randomizado Analgesia preventiva en las cirugías de la columna lumbosacra: estudio prospectivo y aleatorio Preemptive analgesia in lumbosacral spine surgeries: prospective randomized study

    Directory of Open Access Journals (Sweden)

    Augustin Malzac

    2009-06-01

    Full Text Available OBJETIVO: Analisar a eficácia da analgesia preemptiva pelo método da administração de analgésicos antes e após o início do estímulo doloroso operatório, comparando-as. A melhora do quadro doloroso pós-operatório nas cirurgias da coluna vertebral no segmento lombossacro, por via posterior, não tem sido completamente investigada. MÉTODOS: Sessenta e dois pacientes submetidos à microdiscectomia ou microdescompressão, em um único nível, na coluna lombossacra, foram divididos em três grupos, 20 pacientes no primeiro (A não receberam qualquer substância analgésica (controle. Vinte e dois no segundo (B, os quais foram submetidos à injeção epidural, 20 minutos antes da incisão cirúrgica, contendo 10 mL de marcaína e morfina. No terceiro e no último grupo (C com vinte pacientes, foi injetado, com auxílio de um cateter, no espaço epidural, as mesmas drogas do grupo B, através da incisão antes do fechamento da ferida operatória. Os pacientes foram examinados durante as primeiras 24 horas com auxílio da escala verbal de dor. RESULTADOS: Os três grupos foram comparados quanto à idade, sexo, nível e tempo cirúrgico. Os dados não obedeceram a uma distribuição Gaussiana, o teste não paramétrico de Mann-Whitney foi adotado para análise estatística. Desta maneira, os valores da escala verbal de dor, em todos os intervalos de tempo, foram significativamente baixos (pOBJETIVO: analizar la eficacia y comparar la analgesia preventiva por el método de la administración de analgésicos antes y después del inicio del estímulo doloroso operatorio. La mejoría del cuadro doloroso postoperatorio en las cirugías de la columna vertebral en el segmento lumbosacro, por vía posterior, no ha sido completamente investigada. MÉTODOS: sesenta y dos pacientes sometidos a la microdisección o microdescompresión, en un único nivel, en la columna lumbosacra fueron divididos en tres grupos. Veinte pacientes en el primer grupo (A no

  1. Developing and Evaluating Creativity Gamification Rehabilitation System: The Application of PCA-ANFIS Based Emotions Model

    Science.gov (United States)

    Su, Chung-Ho; Cheng, Ching-Hsue

    2016-01-01

    This study aims to explore the factors in a patient's rehabilitation achievement after a total knee replacement (TKR) patient exercises, using a PCA-ANFIS emotion model-based game rehabilitation system, which combines virtual reality (VR) and motion capture technology. The researchers combine a principal component analysis (PCA) and an adaptive…

  2. PCA Based Rapid and Real Time Face Recognition Technique

    Directory of Open Access Journals (Sweden)

    T R Chandrashekar

    2013-12-01

    Full Text Available Economical and efficient that is used in various applications is face Biometric which has been a popular form biometric system. Face recognition system is being a topic of research for last few decades. Several techniques are proposed to improve the performance of face recognition system. Accuracy is tested against intensity, distance from camera, and pose variance. Multiple face recognition is another subtopic which is under research now a day. Speed at which the technique works is a parameter under consideration to evaluate a technique. As an example a support vector machine performs really well for face recognition but the computational efficiency degrades significantly with increase in number of classes. Eigen Face technique produces quality features for face recognition but the accuracy is proved to be comparatively less to many other techniques. With increase in use of core processors in personal computers and application demanding speed in processing and multiple face detection and recognition system (for example an entry detection system in shopping mall or an industry, demand for such systems are cumulative as there is a need for automated systems worldwide. In this paper we propose a novel system of face recognition developed with C# .Net that can detect multiple faces and can recognize the faces parallel by utilizing the system resources and the core processors. The system is built around Haar Cascade based face detection and PCA based face recognition system with C#.Net. Parallel library designed for .Net is used to aide to high speed detection and recognition of the real time faces. Analysis of the performance of the proposed technique with some of the conventional techniques reveals that the proposed technique is not only accurate, but also is fast in comparison to other techniques.

  3. Application of PCA and HCA to the Structure-Activity Relationship Study of Fluoroquinolones

    Science.gov (United States)

    Li, Xiao-hong; Zhang, Xian-zhou; Cheng, Xin-lu; Yang, Xiang-dong; Zhu, Zun-lue

    2006-04-01

    Density functional theory (DFT) was used to calculate molecular descriptors (properties) for 12 fluoroquinolone with anti-S.pneumoniae activity. Principal component analysis (PCA) and hierarchical cluster analysis (HCA) were employed to reduce dimensionality and investigate in which variables should be more effective for classifying fluoroquinolones according to their degree of an-S.pneumoniae activity. The PCA results showed that the variables ELUMO, Q3, Q5, QA, logP, MR, VOL and ΔEHL of these compounds were responsible for the anti-S.pneumoniae activity. The HCA results were similar to those obtained with PCA. The methodologies of PCA and HCA provide a reliable rule for classifying new fluoroquinolones with anti-S.pneumoniae activity. By using the chemometric results, 6 synthetic compounds were analyzed through the PCA and HCA and two of them are proposed as active molecules with anti-S.pneumoniae, which is consistent with the results of clinic experiments.

  4. Análisis de la analgesia en la baja de combate: Experiencia de la Sanidad Militar española Analgesia in the management of the combat casualty: Experience of the Spanish Medical Service

    Directory of Open Access Journals (Sweden)

    R. Navarro Suay

    2012-03-01

    Full Text Available Antecedentes y Objetivos: La analgesia del herido ha jugado un papel trascendental en la medicina militar. En la actualidad, continúa siendo un reto médico, táctico y logístico dentro del tratamiento integral de la baja en combate. El objetivo de este estudio es valorar la homogeneidad de los fármacos analgésicos administrados, del momento de inicio del tratamiento, del número y tipos de vías de acceso para administración de analgesia, así como del tipo de anestesia realizada en las bajas por arma de fuego o por artefacto explosivo atendidas en el ROLE 2E español de Herat (Afganistán entre 2005 y 2008, siguiendo un índice de gravedad anatómico (NISS de las lesiones. Material y métodos: Se realiza un estudio observacional, retrospectivo, obteniendo una muestra de 256 pacientes. Resultados: Los fármacos analgésicos más empleados fueron los AINEs (73%, seguidos de los mórficos mayores (44%, coadyuvantes (29%, mórficos menores (21% y ketamina (12%. La analgesia se realizó a nivel prehospitalario en un 61% y a nivel intrahospitalario en un 31% de los casos. La vía de administración más frecuente fue la intravenosa (79%. En el 75% sólo se consiguió un acceso para medicación analgésica. El procedimiento anestésico más empleado fue la anestesia general (32%. Conclusiones: El tratamiento analgésico prestado a las bajas en combate de la muestra es homogéneo en cuanto a los fármacos empleados, el tipo y número de vías de administración conseguidas. Sin embargo es heterogéneo en cuanto al tipo de AINE elegido y al inicio en la administración de los fármacos analgésicos.Antecedents and Objectives: The analgesia of the wounded has played a vital role in military medicine. Nowadays it still is a medical, tactical and logistical challenge in the integral management of the combat casualty. The objective of this study is to evaluate the homogeneity of the analgesic drugs used, starting point of the treatment, number and

  5. Sufentanil subaracnóideo associado à bupivacaína hiperbárica para analgesia de parto: É possível reduzir a dose do opióide? Sufentanil subaracnóideo asociado a la bupivacaína hiperbárica para analgesia de parto: Es posible reducir la dosis del opioide? Spinal sufentanil associated to hyperbaric bupivacaine: Is it possible to decrease opioid dose?

    Directory of Open Access Journals (Sweden)

    Eduardo Tsuyoshi Yamaguchi

    2004-04-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: A adição de bupivacaína isobárica a doses menores de sufentanil por via subaracnóidea promove analgesia de qualidade satisfatória, com menor incidência de efeitos colaterais. O objetivo do estudo foi avaliar a qualidade da analgesia e a incidência de efeitos colaterais de doses reduzidas de sufentanil subaracnóideo associados à bupivacaína hiperbárica em analgesia de parto. MÉTODO: Foram estudadas prospectivamente 69 gestantes de termo em trabalho de parto. As gestantes foram aleatoriamente divididas em três grupos que receberam, no espaço subaracnóideo, a combinação de 2,5 mg de bupivacaína hiperbárica e 1 ml de solução fisiológica (Grupo Controle; 2,5 mg de bupivacaína hiperbárica e 2,5 µg de sufentanil (Grupo S2,5 ou 2,5 mg de bupivacaína hiperbárica e 5 µg de sufentanil (Grupo S5. A dor, de acordo com a escala analógico visual (EAV de dor e a incidência de efeitos colaterais foram avaliadas a cada 5 minutos nos primeiros quinze minutos e a seguir a cada 15 minutos até o nascimento. O estudo terminava com o nascimento, ou quando a paciente solicitava medicação analgésica de resgate (EAV > 3 cm. RESULTADOS: Os grupos S2,5 e S5 apresentaram maior duração de analgesia (67,2 ± 38,6 e 78,9 ± 38,7 minutos, respectivamente e maior porcentagem de pacientes com analgesia efetiva (100% e 95,6%, respectivamente que o grupo Controle, no qual a duração média de analgesia foi de 35,9 ± 21,6 minutos (p JUSTIFICATIVA Y OBJETIVOS: La adición de bupivacaína isobárica a dosis menores de sufentanil por vía subaracnóidea promueve analgesia de cualidad satisfactoria, con menor incidencia de efectos colaterales. El objetivo del estudio fue evaluar la calidad de la analgesia y la incidencia de efectos colaterales de dosis reducidas de sufentanil subaracnóideo asociados a bupivacaína hiperbárica en analgesia de parto. MÉTODO: Fueron estudiadas prospectivamente 69 embarazadas de término en

  6. Analgesia pós-operatória em pacientes pediátricos: estudo comparativo entre anestésico local, opióides e antiinflamatório não esteróide Analgesia pós-operatoria en pacientes pediátricos: estudio comparativo entre anestésico local, opioides y antiinflamatorio no esteróide Postoperative analgesia in pediatric patients: comparative study among local anesthetics, opioids and non-steroidal anti-inflammatory drugs

    Directory of Open Access Journals (Sweden)

    Miriam Seligman Menezes

    2002-04-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: O tratamento da dor pós-operatória em crianças tem merecido atenção especial nas últimas décadas. O propósito deste estudo foi analisar a analgesia pós-operatória de crianças no que se relaciona à qualidade e à duração da analgesia, à confiabilidade dos métodos de avaliação e à incidência de efeitos colaterais decorrentes das diferentes técnicas de analgesia utilizadas. MÉTODO: Participaram do estudo 100 crianças com idades entre 2 e 12 anos alocadas em 5 grupos de 20 crianças cada, que receberam, logo após a indução da anestesia, os seguintes tratamentos de analgesia: grupo B, bupivacaína a 0,25%, com vasoconstritor, 0,5 a 1 ml.kg-1; grupo F, fentanil, 1,5 µg.kg-1; grupo M, morfina, 30 µg.kg-1, grupo S, sufentanil, 0,3 µg.kg-1, todos por via peridural caudal e o grupo D, que recebeu diclofenaco potássico (1 mg.kg-1 por via retal. A dor foi avaliada por 2 métodos distintos: um predominantemente comportamental, objetivo e o outro de auto-avaliação, subjetivo, durante as primeiras 4 horas e a partir deste momento até a 24ª hora. Efeitos colaterais foram observados e tratados. RESULTADOS: Nas primeiras 4 horas os pacientes dos grupos B, F, M e S apresentaram comportamentos semelhantes, com mínimas necessidades de analgesia complementar. Nas 20 horas restantes o maior tempo de analgesia foi o observado no grupo S, não diferindo dos grupos F e M, mas sendo significativamente superior ao tempo dos grupos B e D. Diclofenaco retal não promoveu alívio efetivo da dor. Maior incidência de efeitos colaterais ocorreu no grupo M que não diferiu do grupo S, mas foi significativamente superior aos grupos F, B e D. Houve correlação positiva e significativa entre os escores das 2 escalas de avaliação de dor. CONCLUSÕES: Os opióides espinhais mostraram-se seguros e efetivos na analgesia pós-operatória em crianças, porém quando comparados à bupivacaína não apresentaram diferen

  7. Analgesia pós-operatória com bloqueio bilateral do nervo pudendo com bupivacaína S75:R25 a 0,25%: estudo piloto em hemorroidectomia sob regime ambulatorial Analgesia pos-operatoria con bloqueo bilateral del nervio pudendo con bupivacaína S75:R25 a 0,25%: estudio piloto en hemorroidectomia bajo régimen ambulatorial Bilateral pudendal nerves block for postoperative analgesia with 0.25% S75:R25 bupivacaine: pilot study on outpatient hemorrhoidectomy

    Directory of Open Access Journals (Sweden)

    Luiz Eduardo Imbelloni

    2005-12-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: A hemorroidectomia pode ser realizada sob várias técnicas anestésicas e em regime ambulatorial. A dor pós-operatória é intensa e pode atrasar o retorno para a residência. O objetivo deste estudo foi avaliar as vantagens e a realização do bloqueio bilateral dos nervos pudendos para analgesia pós-operatória em hemorroidectomias. MÉTODO: O bloqueio bilateral dos nervos pudendos com bupivacaína S75:R25 a 0,25% foi realizado com estimulador de nervos em 35 pacientes submetidos à hemorroidectomia sob raquianestesia. Foram avaliadas intensidade da dor, duração da analgesia, analgesia de demanda e eventuais complicações relacionadas à técnica. Os dados foram avaliados às 6, 12, 18, 24 e 30 horas após o término da intervenção cirúrgica. RESULTADOS: Em todos os pacientes, foi obtido sucesso com a estimulação de ambos os nervos pudendos. Em nenhum momento da avaliação ocorreu dor intensa. Até 12 horas após o bloqueio, todos os pacientes apresentaram anestesia na região perineal; com 18 horas, 17 pacientes e 24 horas; 10 pacientes A analgesia pós-operatória foi ótima em 18 pacientes; satisfatória, em cinco pacientes; e insatisfatória, em sete pacientes. A duração média da analgesia foi de 23,77 horas. Não ocorreram alterações da pressão arterial, da freqüência cardíaca, nem foram observadas náuseas ou vômitos. Todos os pacientes tiveram micção espontânea. Nenhuma complicação local ou sistêmica foi relacionada ao anestésico local. Vinte e sete pacientes classificaram de excelente a técnica de analgesia e apenas três pacientes do sexo masculino ficaram satisfeitos o que foi justificado pela anestesia no pênis. CONCLUSÕES: O bloqueio bilateral dos nervos pudendos, orientado por estimulador de nervos, proporciona a analgesia de excelente qualidade, com baixa necessidade de opióides, sem complicações local ou sistêmica e sem retenção urinária. Estudos controlados

  8. Stereospecific potentiation of opiate analgesia by cocaine: predominant role of noradrenaline.

    Science.gov (United States)

    Misra, A L; Pontani, R B; Vadlamani, N L

    1987-01-01

    Cocaine hydrochloride (50 mg) pellets implanted subcutaneously in male Wistar rats potentiated the analgesia of morphine, levorphanol, methadone and buprenorphine as measured by the tail-withdrawal test. Potentiated opiate analgesia was abolished by naloxone and further enhanced by desipramine and phenoxybenzamine. Yohimbine, alpha-methyl p-tyrosine, haloperidol, zimelidine, methysergide, p-chlorophenylalanine produced no significant effect on potentiated opiate analgesia. Pseudo-cocaine (dextro-cocaine), which is several-fold less potent than cocaine as an inhibitor of noradrenaline and dopamine reuptake in the CNS, had no significant effect on opiate analgesia. Analgesia produced by low doses of baclofen, a GABA agonist, was also not potentiated by cocaine. This study suggests a predominant role for noradrenaline in the stereospecific potentiation of opiate analgesia by cocaine. PMID:3822492

  9. A systematic review of randomized trials evaluating regional techniques for postthoracotomy analgesia

    DEFF Research Database (Denmark)

    Joshi, G.P.; Bonnet, F.; Shah, R.;

    2008-01-01

    evidence is needed to assess the comparative benefits of alternative techniques, guide clinical practice and identify areas requiring further research. METHODS: In this systematic review of randomized trials we evaluated thoracic epidural, paravertebral, intrathecal, intercostal, and interpleural analgesic...... techniques, compared to each other and to systemic opioid analgesia, in adult thoracotomy. Postoperative pain, analgesic use, and complications were analyzed. RESULTS: Continuous paravertebral block was as effective as thoracic epidural analgesia with local anesthetic (LA) but was associated with a reduced...... incidence of hypotension. Paravertebral block reduced the incidence of pulmonary complications compared with systemic analgesia, whereas thoracic epidural analgesia did not. Thoracic epidural analgesia was superior to intrathecal and intercostal techniques, although these were superior to systemic analgesia...

  10. Sensitivity of quantitative sensory models to morphine analgesia in humans

    OpenAIRE

    Olesen AE; Brock C; Sverrisdóttir E; Larsen IM; Drewes AM

    2014-01-01

    Anne Estrup Olesen,1,2 Christina Brock,1,2 Eva Sverrisdóttir,2 Isabelle Myriam Larsen,1 Asbjørn Mohr Drewes1,3 1Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark; 2Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark; 3Department of Clinical Medicine, Aalborg University, Aalborg, Denmark Introduction: Opioid analgesia can be explored with quantitat...

  11. Intrapartum analgesia as a condition of human satisfaction at hospital

    Directory of Open Access Journals (Sweden)

    Concetta Polizzi

    2013-06-01

    Full Text Available The study investigates parturients’ satisfaction with intrapartum analgesia. It aims to assess their opinions about hospital and health staff involved in delivery, besides investigating emotional control, locus control and bond between mothers and their newborn infants. A multidimensional approach has been used to investigate the variable of woman as a person, the variable of context and the variable of bond with the newborn infant. The study was conducted according to a quasi-experimental design, with a control group. The study was performed within the Analgesia and Intensive Care Operational Unit of the Maternal-Infant Department of the P. Giaccone University General Hospital of Palermo. It involved 60 women subdivided into two groups of 30 women each, the experimental group (women who requested intrapartum analgesia called the A group, and the control group (women who refused it called the B group. The following tools were administered: the STAI-Y (State-Trait Anxiety Inventory, form Y scale; the Depression Questionnaire of CBA (Cognitive Behavioural Assessment scale; the Locus of Control questionnaire; and an interview designed for the purpose. The experimental A group women exhibited lower levels of state anxiety and depression post-partum than those of the control B group; moreover, the women in the A group exhibited higher levels of external locus of control and evaluated delivery more positively than those of the B group. There were no significant differences with regard to the relationship with their newborn infants. The study shows that intrapartum analgesia provides hospitals with the possibility to satisfy women’s needs for safety and well-being.

  12. Orthostatic Intolerance Ambulation in Patients Using Patient Controlled Analgesia

    OpenAIRE

    Park, Kwang Ok; Lee, Yoon Young

    2013-01-01

    Background Opioid analgesics are widely used to reduce postoperative pain and to enhance post-operative recovery. However, orthostatic intolerance (OI) induced by opioid containing intravenous patient controlled analgesia (IPCA) may hinder postoperative recovery. This study investigated factors that affect OI in patients receiving IPCA for postoperative pain control. Methods OI was instantly evaluated at the time of first ambulation in 175 patients taking opioid containing IPCA after open and...

  13. THORACIC EPIDURAL ANAESTHESIA AND ANALGESIA IN PATIENTS UNDERGOING ESOPHAGOPLASTY

    Directory of Open Access Journals (Sweden)

    Laura Magdalena Nicolescu

    2011-05-01

    Full Text Available Epidural anesthesia and analgesia is widely used to manage major abdominal surgery, but its effects in managing patients submitted to esophagoplasty are still debated. The aim of this study was to assess the influence of thoracic epidural anaesthesia on postoperative respiratory function, digestive complications and postoperative stress in patients with esophagoplasty. Twenty-six patients were admitted in a prospective study. The patients were divided into two groups: fourteen were in group A, and received general anaesthesia for esophagoplasty, and twelve were in group B, and received general anaesthesia combined with epidural thoracic anaesthesia and postoperative epidural thoracic analgesia for the same surgery procedure. When compare the two groups, the outcomes were better in group B: the rate of postoperative pneumonia was lowered from 35,7% to 16,7%, the postoperative mecanical ventilation under six hours was increased from 21,43% to 100%, the incidence of adult respiratory detrease syndrome was decreased from 28,5% to 8,3%, the digestive recovery after four days was increased from 57,1% to 75%. The cortizolemia was also lowered at six hours from 52mg% to 23mg%, and at 24 hours, from 22 to 11mg%. Identically, the sanguine lactate at four hours decreased from 6 to 3 mEq%. In conclusion, this study suggest that patients undergoing esophagoplasty will receive substantial benefit from combined general and epidural anesthesia with continuing postoperative epidural analgesia.

  14. Analgesia Preventiva, ao Teste do Formol, por Terapia Laser em Ratinhos

    OpenAIRE

    Daniel Pozza; Marília Gerhardt de Oliveira; João Macedo Sobrinho; Nelson Ribeiro Neto

    2007-01-01

    The present research assessed the analgesic effect of the laser therapy in healthy tissues of 10 mice dividedinto two groups: L: red laser irradiation (665 nm, 30 mW, 10 J/cm2, 334 s). C: control laser irradiation (334 s).After laser therapy formalin solution was injected on the same paw, the animal was placed in a transparentbox and observers recorded the paw rose time during 30 minutes. The results showed statistical differenceand red laser presented better results in all times.

  15. Stereotactic core biopsy of an impalpable screen-detected breast lesion using acupuncture-analgesia

    OpenAIRE

    English, R E; Chen, J. H.

    2010-01-01

    Chinese acupuncture-analgesia is used for pain management during various surgical procedures. Over the past 40 years this approach has been introduced in many countries and has been particularly helpful in the investigation and treatment of patients who are unable to tolerate conventional analgesia. We report here the case of a woman with a 17-year history of myalgic encephalitis who underwent a stereotactic core biopsy of the breast under acupuncture-analgesia. A planning session was needed ...

  16. Study of efficacy, safety and cardiotocographic changes during epidural analgesia with ropivacaine in labour

    OpenAIRE

    Sharma, Jyoti; Gandhi, Mansi U; Bhavsar, Mrugank M

    2013-01-01

    Background: Epidural analgesia during labour provides effective pain relief along with better maternal and neonatal outcome. Our aim of the study is to check safety and efficacy of Ropivacaine during labour analgesia. We have also compared cardiotocographic changes in labour with versus without epidural analgesia.Material & Methods: 60 Antenatal cases in between 37-41 weeks of pregnancy in active labour were selected for study. They were randomly divided into 2 groups: Study Group (Group-...

  17. Patient Controlled Epidural Analgesia during Labour: Effect of Addition of Background Infusion on Quality of Analgesia & Maternal Satisfaction

    Directory of Open Access Journals (Sweden)

    Uma Srivastava

    2009-01-01

    Full Text Available Patient controlled epidural analgesia (PCEA is a well established technique for pain relief during labor. But the inclusion of continuous background infusion to PCEA is controversial. The aim of this study was to assess whether the use of continuous infusion along with PCEA was beneficial for laboring women with regards to quality of analgesia, maternal satisfaction and neonatal outcome in comparison to PCEA alone. Fifty five parturients received epidural bolus of 10ml solution containing 0.125% bupivacaine +2 ìg.ml-1 of fentanyl. For maintenance of analgesia the patients of Group PCEA self administered 8 ml bolus with lockout interval of 20 minutes of above solution on demand with no basal infusion. While the patients of Group PCEA + CI received continuous epidural infusion at the rate of 10 ml.hr-1 along with self administered boluses of 3 ml with lockout interval of 10 minutes of similar epidural solution. Patients of both groups were given rescue boluses by the anaesthetists for distressing pain. Verbal analogue pain scores, incidence of distressing pain, need of supplementary/rescue boluses, dose of bupivacaine consumed, maternal satisfaction and neonatal Apgar scores were recorded. No significant difference was observed between mean VAS pain scores during labor, maternal satisfaction, mode of delivery or neonatal Apgar scores. But more patients (n=8 required rescue boluses in PCEA group for distressing pain. The total volume consumed of bupivacaine and opioid was slightly more in PCEA + CI group. In both the techniques the highest sensory level, degree of motor block were comparable& prolongation of labor was not seen. It was concluded that both the techniques provided equivalent labor analgesia, maternal satisfaction and neonatal Apgar scores. PCEA along with continuous infusion at the rate of 10 ml/ hr resulted in lesser incidence of distressing pain and need for rescue analgesic. Although this group consumed higher dose of bupivacaine

  18. Improved swelling resistance for PCA austenitic stainless steel under HFIR irradiation through microstructural control

    International Nuclear Information System (INIS)

    Six microstructural variants of Prime Candidate Alloy (PCA) were evaluated for swelling resistance during HFIR irradiation, together with several heats of type 316 stainless steel (316). Swelling was negligible in all the steels at 3000C after approx. 44 dpa. At 500 to 6000C 25%-cold-worked PCA showed better void swelling resistance than type 316 at approx. 44 dpa. There was less swelling variability among alloys at 4000C, but again 25%-cold-worked PCA was the best. Microstructurally, swelling resistance correlated with development of fine, stable bubbles whereas high swelling was due to coarser distributions of bubbles becoming unstable and converting to voids (bias-driven cavities)

  19. Sensitivity of quantitative sensory models to morphine analgesia in humans

    Directory of Open Access Journals (Sweden)

    Olesen AE

    2014-12-01

    Full Text Available Anne Estrup Olesen,1,2 Christina Brock,1,2 Eva Sverrisdóttir,2 Isabelle Myriam Larsen,1 Asbjørn Mohr Drewes1,3 1Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark; 2Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark; 3Department of Clinical Medicine, Aalborg University, Aalborg, Denmark Introduction: Opioid analgesia can be explored with quantitative sensory testing, but most investigations have used models of phasic pain, and such brief stimuli may be limited in the ability to faithfully simulate natural and clinical painful experiences. Therefore, identification of appropriate experimental pain models is critical for our understanding of opioid effects with the potential to improve treatment. Objectives: The aim was to explore and compare various pain models to morphine analgesia in healthy volunteers. Methods: The study was a double-blind, randomized, two-way crossover study. Thirty-nine healthy participants were included and received morphine 30 mg (2 mg/mL as oral solution or placebo. To cover both tonic and phasic stimulations, a comprehensive multi-modal, multi-tissue pain-testing program was performed. Results: Tonic experimental pain models were sensitive to morphine analgesia compared to placebo: muscle pressure (F=4.87, P=0.03, bone pressure (F=3.98, P=0.05, rectal pressure (F=4.25, P=0.04, and the cold pressor test (F=25.3, P<0.001. Compared to placebo, morphine increased tolerance to muscle stimulation by 14.07%; bone stimulation by 9.72%; rectal mechanical stimulation by 20.40%, and reduced pain reported during the cold pressor test by 9.14%. In contrast, the more phasic experimental pain models were not sensitive to morphine analgesia: skin heat, rectal electrical stimulation, or rectal heat stimulation (all P>0.05. Conclusion: Pain models with deep tonic stimulation including C fiber activation

  20. Sex Differences in the Morphine-Sparing Effects of Intraoperative Dexmedetomidine in Patient-Controlled Analgesia Following General Anesthesia

    Science.gov (United States)

    Li, Yuan-Yuan; Ge, Dong-Jian; Li, Jin-Yu; Qi, Bin

    2016-01-01

    Abstract Previous studies have reported that intraoperative dexmedetomidine has morphine-sparing effects in patient-controlled analgesia (PCA). The present study was designed to investigate the possible sex differences in the morphine-sparing effects of intraoperative dexmedetomidine following general anesthesia. A total of 223 patients scheduled for surgeries under general anesthesia were divided into female and male groups. Each group was then subdivided into 2 subgroups that were maintained using propofol/remifentanil/dexmedetomidine (PRD) or propofol/remifentanil/saline (PRS). During the first 24 hours postsurgery, both female and male PRD patients had lower scores on a visual analog scale (VAS) (fPRS vs fPRD, P  0.05) and consumed comparable morphine compared to the male PRD patients (fPRD vs mPRD, P = 0.4238). However, when normalized to body weight, they consumed much more morphine than male PRD patients (fPRD vs mPRD, P < 0.001), and this effect was not seen in the PRS patients. Intraoperative administration of dexmedetomidine appeared to have a stronger morphine-sparing effect in controlling postoperative acute pain in male patients than in female patients. PMID:27149500

  1. ¿Se debe mantener la analgesia epidural como técnica de base en la UDA? Should epidural analgesia still be a routine technique in pain units?

    Directory of Open Access Journals (Sweden)

    F. Caba

    2010-05-01

    Full Text Available La analgesia epidural se ha convertido en una técnica rutinaria en el manejo perioperatorio de los pacientes quirúrgicos que se ha extendido fuera de los quirófanos y de las unidades de alta dependencia hacia las salas de hospitalización. La irrupción en este nuevo escenario ha mejorado la analgesia postoperatoria con aceptables márgenes de seguridad, lo que le ha servido para colocarse en un lugar predominante entre las pautas analgésicas de las Unidades de Dolor Agudo (UDA. La analgesia epidural con anestésicos locales y opioides frente a la sistémica con opioides ha presentado históricamente una superior eficacia analgésica, y una disminución de complicaciones derivadas de la atenuación del estrés quirúrgico y de la mejora en la función cardiorrespiratoria. Sin embargo, frente a estas ventajas la analgesia epidural también presenta inconvenientes como la hipotensión arterial o la retención urinaria, junto a las potencialmente graves derivadas del daño neurológico ocasionado por un hematoma epidural, una infección o una lesión directa del tejido nervioso. Si sus ventajas han resultado consistentes y fundamentadas, en este momento no lo parecen tanto. El avance que ha supuesto la cirugía mínimamente invasiva con altas más precoces, junto al desarrollo de estrategias multimodales, está conduciendo a un replanteamiento de la utilización de técnicas como la epidural y a una reevaluación de sus indicaciones. Las últimas evidencias nos inducen a pensar que la epidural probablemente haya tocado techo en el tratamiento del dolor postoperatorio y comenzará a perder terreno frente a otras técnicas igualmente efectivas, con menores complicaciones y efectos secundarios. Este será un proceso lento en el que deberá quedar asegurado que las alternativas analgésicas ofrecen realmente mejores resultados en cuanto a eficacia, seguridad, tolerabilidad y calidad de la recuperación desde la perspectiva del paciente

  2. Analgesia invasiva domiciliaria en el manejo del dolor postoperatorio en cirugía mayor ambulatoria mediante bombas elastoméricas intravenosas Home invasive analgesia in the management of postoperative pain alter outpatient major surgery using intravenous elastomeric pumps

    Directory of Open Access Journals (Sweden)

    R. Rodríguez de la Torre

    2011-06-01

    Full Text Available Introducción: el dolor postoperatorio moderado-severo sigue siendo un problema en cirugía ambulatoria, ya que provoca problemas de flujo de pacientes, retrasando el alta de los pacientes, siendo uno de los principales motivos de reingreso en los hospitales, y por tanto un importante indicador de calidad de estas Unidades. El empleo de técnicas analgésicas invasivas domiciliarias, en todos sus regímenes, puede controlar el dolor postoperatorio en estas intervenciones y permitir incluirlas en los programas de cirugía ambulatoria. Objetivos: el objetivo de nuestro estudio es valorar la viabilidad y la seguridad de la utilización de bombas de perfusión continua elastoméricas para la administración de analgesia endovenosa continua domiciliaria, a la vez que valorar la eficacia analgésica y el grado de satisfacción de los pacientes intervenidos en régimen ambulatorio. Material y métodos: estudio retrospectivo de 463 pacientes. Una vez intervenidos bajo estrategia de analgesia multimodal, se les coloca dos tipos diferentes de bombas elastoméricas endovenosas (elastómero de dexketoprofeno o de metamizol. La intensidad del dolor, para evaluar la necesidad de analgesia de rescate, se cuantifica con la escala visual analógica o con la escala verbal simple. En el domicilio (24 horas tras la cirugía, la Unidad de Atención Domiciliaria revisa los efectos secundarios, alteraciones del sueño, intensidad del dolor, necesidad de analgesia de rescate y grado de satisfacción. Resultados: un 69% de los pacientes presentaron dolor de carácter leve o ausencia de dolor tras la intervención y únicamente 16 de los 463 pacientes presentaron dolor de carácter severo. El 27% de los pacientes necesitaron analgesia de rescate y un 9% de los pacientes presentaron efectos secundarios atribuibles a los fármacos analgésicos (4% vómitos, 2% mareos, 2,5% somnolencia y 0,5% insomnio. Ningún paciente tuvo que ser reingresado después del alta. Un 83% de

  3. Intensidade da dor e adequação de analgesia Intensidad del dolor y adecuación de la analgesia Pain intensity of pain and adequacy of analgesia

    Directory of Open Access Journals (Sweden)

    Ana Maria Calil

    2005-10-01

    Full Text Available Trata-se de um estudo inédito em nosso meio, no qual, avaliou-se a intensidade da dor e a adequação da analgesia no setor de emergência. Foram avaliadas 100 vítimas de acidentes de transporte atendidas em um hospital de referência para trauma. A dor foi presente em 90,0% dos casos; 56,0% referiram dor intensa na primeira avaliação e, após três horas de observação, 26,0% permaneceram com dor intensa e 38,0% com dor moderada. Uma significativa parte da população do estudo permaneceu sem analgesia durante o período de observação. Números expressivos de inadequação analgésica foram encontrados demonstrando a reduzida importância conferida a analgesia no trauma em nosso meio.Se trata de un estudio inédito en nuestro medio, en el cual se evaluó la intensidad del dolor y el adecuado procedimiento de analgesia en un sector de emergencia. Se evaluó a 100 víctimas de accidentes de tránsito atendidas en un hospital de referencia para trauma. El dolor fue constatado en el 90,0% de los casos. El 56,0% relató dolor intenso en la primera evaluación. Después de 3 horas de observación, el 26,0% permaneció con dolor intenso y el 38,0% con dolor moderado. Una significativa parte de la población estudiada permaneció sin analgesia durante el período de observación. Se encontró números expresivos de analgesia inadecuada, lo que demuestra la reducida importancia que se da a la analgesia en el trauma en nuestro medio.An unprecedented study in Brazil analyzed pain intensity and adequacy of analgesia at an emergency center. One hundred accident victims attended at a trauma reference hospital were evaluated. Pain was present in 90% of cases; 56.0% complained of severe pain on first evaluation and, three hours later, 26.0% remained in severe pain and 38.0% in moderate pain. A significant portion of the study population did not receive analgesia during the observation period. Considerable numbers of inadequate analgesia were found

  4. por valores

    Directory of Open Access Journals (Sweden)

    Jazmín Díaz-Barrios

    2005-01-01

    Full Text Available La era actual se caracteriza por una búsqueda de la identidad del hombre, donde el pivote del cambio organizacional es el individuo; cambiar en este entorno depende, en gran medida, de los valores que imperen en la cultura de la organización. Este trabajo documental intenta identificar aquellos valores, condición sine-qua-non, para el logro de los objetivos de cambio y analizarlos a fin de determinar sus indicadores, con el objeto de presentar una herramienta a las organizaciones que les facilite adaptarse a los nuevos tiempos. Se encontró que los valores: Delegación, Comunicación, Colaboración, Participación y Aprendizaje, son esenciales en los cambios integrales de esta era. Se determinaron 20 indicadores de su presencia. Se concluye que con esta información cada ente puede elaborar instrumentos que le permitan saber si los valores requeridos están presentes y en caso contrario tomar decisiones que alineen a la organización alrededor de los valores humanistas planteados, incrementando así las posibilidades de éxito en el proceso de cambio y por ende, las posibilidades de supervivencia en esta nueva época.

  5. Lactate Oxidation Coupled to Iron or Electrode Reduction by Geobacter sulfurreducens PCA

    KAUST Repository

    Call, D. F.

    2011-10-14

    Geobacter sulfurreducens PCA completely oxidized lactate and reduced iron or an electrode, producing pyruvate and acetate intermediates. Compared to the current produced by Shewanella oneidensis MR-1, G. sulfurreducens PCA produced 10-times-higher current levels in lactate-fed microbial electrolysis cells. The kinetic and comparative analyses reported here suggest a prominent role of G. sulfurreducens strains in metaland electrode-reducing communities supplied with lactate. © 2011, American Society for Microbiology.

  6. PCA-LDA算法在性别鉴别中的应用%Application of PCA and LDA on Gender Classification

    Institute of Scientific and Technical Information of China (English)

    何国辉; 甘俊英

    2006-01-01

    结合主元分析(PrincipalComponentsAnalysis,PCA)与线性鉴别分析(Linear Discriminant Analysis,LDA)的特点,提出用于性别鉴别的PCA-LDA算法.该算法通过PCA算法求得训练样本的特征子空间,并在此基础上计算LDA算法的特征子空间.将PCA算法与LDA算法的特征子空间进行融合,获得PCA-LDA算法的融合特征空间.训练样本与测试样本分别朝融合特征空间投影,从而得到识别特征.利用最近邻准则即可完成性别鉴别.基于ORL(Olivetti Research Laboratory)人脸数据库的实验结果表明,PCA-LDA算法比PCA算法识别性能好,在性别鉴别中是一种有效的方法.

  7. Prospective, randomized, controlled trial of thoracic epidural or patient-controlled opiate analgesia on perioperative quality of life.

    LENUS (Irish Health Repository)

    Ali, M

    2010-03-01

    Perioperative epidural analgesia provides continuous pain control and may have advantages over parenteral opiate administration. This study assessed the impact of epidural analgesia on quality of life (QOL) of patients undergoing major surgery.

  8. Utilidad del citrato fentanilo oral transmucosa (CFOT para procurar ansiolisis preoperatoria y analgesia postoperatoria en cirugía pediátrica Premedication with oral fentanil (CFOT in paedriatic surgery

    Directory of Open Access Journals (Sweden)

    F. J. Pérez-Bustamante

    2008-03-01

    Full Text Available La cirugía en la población infantil representa una fuente de disconfort para el paciente y su entorno familiar que a menudo es infravalorado tanto por éstos como por los profesionales. Aún hay mucho por hacer para disminuir este impacto y proporcionar a los niños unas condiciones emocionales adecuadas para enfrentarse a la cirugía y al postoperatorio. El objetivo de este trabajo era demostrar la utilidad del citrato de fentanilo oral transmucosa (CFOT como medio de ansiolisis preoperatorio y analgesia postoperatoria. Para ello se administró previo a la intervención 10 ug/Kg de CFOT a un grupo de 45 niños sometidos a adenoamigdalectomía y se valoró el comportamiento, la colaboración y la analgesia obtenida en el antequirófano y postoperatorio inmediato. Los resultados obtenidos se compararon con los de un grupo control similar utilizando para ello la T de student y ANOVA, obteniéndose diferencias significativas en cuanto al grado de colaboración, ansiolisis y analgesia a favor del grupo CFOT. Nosotros sostenemos que este método es además seguro, sencillo y goza de una gran aceptación por parte de los padres y profesionales implicados en el proceso asistencial.The surgery in the paedriatic population represents a source of disconfort for the patient and his familiar surroundings that often are infravalued, so much by these as by the professionals. Still there is much to make to diminish this impact and to provide to the children emotional conditions adapted to face the surgery and the postoperative period. The objective of this work was to demonstrate the utility of fentanyl oral (CFOT to provide ansiolityc and postoperative analgesia. 10 ug/Kg of CFOT was administered previous to intervention to a group of 45 children submissive for amigdalectomy and the behavior was valued, the collaboration and the analgesia obtained in the immediate postoperative period. The obtained results was compared with those of a similar placebo group

  9. Emprego do antiinflamatório não esteróide ketoprofeno na analgesia preemptiva em cães

    Directory of Open Access Journals (Sweden)

    Alves Aline de Souza

    2001-01-01

    Full Text Available A analgesia preemptiva tem como princípio básico a administração de analgésicos antes da ocorrência de estímulos dolorosos, reduzindo ou prevenindo a dor e diminuindo a dose analgésica requerida, comparada com a dose usada após a ocorrência do estímulo doloroso. Há redução ou prevenção da "memória" da dor junto ao sistema nervoso central. A analgesia preemptiva permite atenuar ou prevenir o desenvolvimento da sensibilização central induzida pela cirurgia. O presente estudo teve como objetivo avaliar o uso do antiinflamatório não esteróide (AINE ketoprofeno na analgesia preemptiva. Foram utilizados 16 cães, com idades variadas, fêmeas e machos, com peso superior a 10kg. Os animais foram divididos, aleatoriamente, em dois grupos: no grupo K, foram tratados com ketoprofeno e no grupo P foi utilizado placebo constituído de solução fisiológica; no final do procedimento cirúrgico os animais do grupo K receberam placebo e os do grupo P foram tratados com ketoprofeno. Esses procedimentos foram feitos antes da ocorrência do estímulo doloroso causado pela cirurgia de toracotomia. Parâmetros como freqüência cardíaca, freqüência respiratória, volume corrente, volume minuto, hemogasometria e grau de dor foram mensurados por seis horas pós-operatórias. O protocolo utilizado apresentou variações significativas do bicarbonato e dióxido de carbono total, não apresentando variações significativas nos escores de dor. Esses resultados, aparentemente, não justificam o uso do ketoprofeno na analgesia preemptiva.

  10. Phase 1 development of an index to measure the quality of neuraxial labour analgesia: exploring the perspectives of childbearing women

    OpenAIRE

    Angle, Pamela; Landy, Christine Kurtz; Charles, Cathy; Yee, Jennifer; Watson, Jo; Kung, Rose; Kronberg, Jean; Halpern, Stephen; Lam, Desmond; Lie, Lie Ming; Streiner, David

    2010-01-01

    Purpose Modern neuraxial labour analgesia reflects a shift in obstetrical anesthesia thinking – away from a simple focus on pain relief towards a focus on the overall quality of analgesia. However, advances in the methods used to measure outcomes have not kept pace with clinical progress, and these approaches must evolve to facilitate meaningful assessment of the advances provided towards the quality of analgesia. Developing a tool to measure the quality of neuraxial labour analgesia that res...

  11. Meningite após técnica combinada para analgesia de parto: relato de caso Meningitis después de técnica combinada para analgesia de parto: relato de caso Meningitis after combined spinal-epidural analgesia for labor: case report

    Directory of Open Access Journals (Sweden)

    Carlos Escobar Vásquez

    2002-06-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: Meningite é uma complicação grave em anestesia regional, embora rara de ocorrer. O objetivo deste relato é mostrar um caso de uma paciente que evoluiu com meningite após realização de analgesia de parto pela técnica combinada (raqui-peridural com dupla punção. RELATO DO CASO: Paciente com 25 anos, segunda gestação e cesariana anterior, em trabalho de parto. Foi realizada analgesia de parto pela técnica combinada (raqui-peridural com dupla punção. Após 24 horas apresentou cefaléia em repouso, picos de hipertermia, calafrios discretos, que regrediram com medicação sintomática. No 5º dia a cefaléia piorou. No 10º dia surgiram vômitos e dor na nuca. No 13º dia os sintomas tornaram-se mais intensos. Foi realizada punção lombar. A história clínica e o exame do líquor foram compatíveis com meningite bacteriana. CONCLUSÕES: A técnica combinada (raqui-peridural para analgesia do parto está próxima do ideal. Cuidados com a técnica de anti-sepsia são necessários para realização de bloqueios espinhais. A complicação apresentada ocorreu sem a aparente falha na realização da técnica, sendo uma questão que é inerente ao risco-benefício que a técnica proporciona.JUSTIFICATIVA Y OBJETIVOS: Meningitis es una complicación grave en anestesia regional, no obstante, rara de ocurrir. El objetivo de este relato es mostrar un caso de una paciente que evolucionó con meningitis después de realización de analgesia de parto por la técnica combinada (raqui-peridural con dupla punción. RELATO DEL CASO: Paciente con 25 anos, segunda gestación y cesariana anterior, en trabajo de parto. Fue realizada analgesia de parto por la técnica combinada (raqui-peridural con dupla punción. Después de 24 horas presentó cefalea en reposo, picos de hipertermia, calofríos discretos, que mejoraron con medicación sintomática. En el 5º día la cefalea peoró. En el 10º día surgieron vómitos y dolor en la

  12. The effect of adding epinephrine to combination of sufentanil and bupivacaine in spinal analgesia during labor

    Directory of Open Access Journals (Sweden)

    Parisa Golfam

    2011-03-01

    Full Text Available Background: Spinal analgesia is one of the effective and rapid methods for labor. It is not commonly used because of short duration of analgesia and motor block, which limits mother's force in labor progression. We attempted to prolong duration and quality of analgesia by adding Epinephrine.Methods: In this quasi-experimental study 90 pregnant women gravid II and III who referred to Motazedi and Imam Reza Educational & Medical Centers were recruited and divided into two groups of case and control (45 subjects in each group. The case group received spinal analgesia using Sufentanil and Bupivacaine, and Epinephrine while the control group received Sufentanil and Bupivacaine. Data including feeling of pain, motor block, duration of analgesia, fetal heart rate, nausea and vomiting, blood pressure was collected and analyzed using chi-square and t test. Results: duration of analgesia and vomiting were significantly increased in the case group. (p=0.001, p=0.01 respectively. Hemodynamic status in mothers and Apgar score of neonates were not significantly different between two groups.Conclusion: It seems that adding Epinephrine to Sufentanil and Bupivacaine could increase analgesia duration without altering in sensory level although could increase nausea and vomiting its recommended in labor analgesia.

  13. 21 CFR 868.5160 - Gas machine for anesthesia or analgesia.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Gas machine for anesthesia or analgesia. 868.5160... (CONTINUED) MEDICAL DEVICES ANESTHESIOLOGY DEVICES Therapeutic Devices § 868.5160 Gas machine for anesthesia or analgesia. (a) Gas machine for anesthesia—(1) Identification. A gas machine for anesthesia is...

  14. Unpredictability of regression of analgesia during the continuous postoperative extradural infusion of bupivacaine

    DEFF Research Database (Denmark)

    Mogensen, T; Hjortsø, N C; Bigler, D;

    1988-01-01

    Twenty-four otherwise healthy patients scheduled for elective major abdominal surgery received general anaesthesia plus lumbar extradural analgesia. A loading dose of 0.5% plain bupivacaine was given to produce sensory analgesia (pin prick) from T4 to S5 and followed by a continuous infusion of 0...

  15. Mode of delivery after epidural analgesia in a cohort of low-risk nulliparas

    DEFF Research Database (Denmark)

    Eriksen, Lena Mariann; Nøhr, Ellen Aagaard; Kjaergaard, Hanne

    2011-01-01

    Although epidural analgesia is widespread and very effective for alleviating labor pain, its use is still controversial, as the literature is inconsistent about the risk of adverse birth outcome after administration of epidural analgesia. The aim of this study was to explore associations between...

  16. Effect of postoperative epidural analgesia on rehabilitation and pain after hip fracture surgery

    DEFF Research Database (Denmark)

    Foss, Nicolai Bang; Kristensen, Morten Tange; Kristensen, Billy Bjarne; Jensen, Pia Søe; Kehlet, Henrik

    2005-01-01

    Hip fracture surgery usually carries a high demand for rehabilitation and a significant risk of perioperative morbidity and mortality. Postoperative epidural analgesia may reduce morbidity and has been shown to facilitate rehabilitation in elective orthopedic procedures. No studies exist on the...... effect of postoperative epidural analgesia on pain and rehabilitation after hip fracture surgery....

  17. To study the acceptance of epidural analgesia for painless labor at a tertiary care centre

    Directory of Open Access Journals (Sweden)

    Neena Gupta

    2014-08-01

    Full Text Available Background: Epidural analgesia is a central nerve block technique achieved by injection of a local anaesthetic close to the nerves that transmit pain and is widely used as a form of pain relief in labor. Epidural analgesia is the most effective method of pain relief during labor. But unfortunately in India incidence of painless labor by epidural analgesia is very rare even in these days. The aim of our study was to study the acceptance of epidural analgesia at a tertiary care centre. Methods: The present study was conducted in department of obstetrics and gynaecology UISEMH, Kanpur over the period from May 2012 to May 2013. The study was conducted on 98 patients who were counselled regarding the adoption of epidural analgesia as painless labour and out of these 50 patients opted for epidural analgesia. Results: In our present study the acceptance was greater in primigravida (72.43% as compared to multigravida (20%. In our society social reason was the common cause for non-acceptance in primigravida (87.5%. The majority of patients belonged to middle socioeconomic status (52% and more number of educated patients opted for epidural analgesia. Conclusions: It was found that increased awareness can lead to increased acceptance of epidural analgesia. [Int J Reprod Contracept Obstet Gynecol 2014; 3(4.000: 1087-1089

  18. A compression bandage improves local infiltration analgesia in total knee arthroplasty

    DEFF Research Database (Denmark)

    Andersen, Lasse; Husted, Henrik; Otte, Niels Kristian Stahl Kri; Kristensen, Billy Bjarne; Kehlet, Henrik

    2008-01-01

    BACKGROUND: High-volume local infiltration analgesia has been shown to be an effective pain treatment after knee replacement, but the role of bandaging to prolong analgesia has not been evaluated. METHODS: 48 patients undergoing fast-track total knee replacement with high-volume (170 mL) 0.2% rop...

  19. Patient-Controlled Oral Analgesia for Postoperative Pain Management Following Total Knee Replacement

    Directory of Open Access Journals (Sweden)

    Patti Kastanias

    2010-01-01

    Full Text Available PURPOSE: To investigate whether patient-controlled oral analgesia (PCOA used by individuals receiving a total knee replacement could reduce pain, increase patient satisfaction, reduce opioid use and/or reduce opioid side effects when compared with traditional nurse (RN-administered oral analgesia.

  20. Regional anaesthesia and analgesia on the front line.

    Science.gov (United States)

    Scott, D M

    2009-11-01

    Deployment to a combat zone with the military poses many challenges to the anaesthetist. One of these challenges is the safe, rapid and comfortable initial wound management and repatriation of wounded combat soldiers to their home country or tertiary treatment facility for definitive care and rehabilitation. The current conflict in Afghanistan is associated with injury patterns that differ from wars such as Vietnam or Korea. This report describes the experience of an Australian military anaesthetist and the value of regional anaesthesia and analgesia for the care of the wounded combat soldier PMID:20014611

  1. Local infiltration analgesia in hip and knee arthroplasty: an emerging technique.

    Science.gov (United States)

    Dillon, John P; Brennan, Louise; Mitchell, David

    2012-04-01

    The optimal form of post-operative analgesia in hip and knee arthroplasty is still debated. Traditionally, patient-controlled analgesia and epidural anaesthesia were used. Potential side-effects such as nausea, confusion, urinary retention, hypotension and immobility have resulted in the emergence of newer techniques that limit opioid use. Peripheral nerve blockade provides excellent analgesia but limits patient ability to ambulate in the immediate post-operative period. Local infiltrative analgesia (LIA) is an emerging technique that has shown to provide superior analgesia, higher patient satisfaction and earlier discharge from hospital when compared to some of the more traditional methods. This review article highlights the advantages of LIA in hip and knee arthroplasty surgery. We describe the technique used, including additional measures that aid early ambulation and discharge from hospital in this cohort of patients. PMID:22696983

  2. Effects of Labor Analgesia with Continuous Subarachnoid Spinocath Infusion of Sufentanil on Maternal and Neonatal Outcomes%蛛网膜下spinocath连续输注舒芬太尼行分娩镇痛对母婴的影响

    Institute of Scientific and Technical Information of China (English)

    王洪强; 薛广燕

    2012-01-01

    目的 探讨蛛网膜下spinocath连续输注不同剂量舒芬太尼行分娩镇痛对母婴的影响.方法 自愿接受分娩镇痛的足月初产妇120例(ASAⅠ-Ⅱ级),将其按随机数字表法分为4组,每组30例.镇痛药液的配置:A组生理盐水30 mL+舒芬太尼45 μg;B组生理盐水30 mL+舒芬太尼60 μg;C组生理盐水30 mL+舒芬太尼75 μg;D组生理盐水30 mL+舒芬太尼90 μg;4组其他处理均相同.自控镇痛(PCA)设置方案为背景剂量为2 mL,维持剂量为2 mL·h-1,PCA按压1次为1 mL,锁时为45 min.记录镇痛起效时间、首剂镇痛持续时间,PCA用药总量及PCA按压次数和产妇运动阻滞情况,记录产妇第一产程时间、第二产程时间、新生儿Apgar评分、不良反应发生率、镇痛满意度等.结果 C、D组产妇的镇痛起效时间明显较A组缩短,A组首剂镇痛持续时间较C、D组明显缩短,且差异有统计学意义(P<0.05);PCA用药总量及PCA按压次数D组较A组明显减少,差异有统计学意义(P<0.05);A组第一产程时间较B、C、D组延长(P<0.05);4组产妇无一出现恶心呕吐、低血压、呼吸抑制等不良反应,D组瘙痒的发生率较A、B、C组明显升高(P<0.05);无一例产妇对镇痛效果不满意.结论 蛛网膜下spinocath单纯连续输注小剂量舒芬太尼可安全、有效地应用于分娩镇痛.%Objective To evaluate the effects of labor analgesia with continuous subarachnoid spinocath infusion of sufentanil on maternal and neonatal outcomes. Methods A total of 120 ASA Ⅰ-Ⅱ primiparas who voluntarily accepted labor analgesia were randomly divided into four groups,with 30 primiparas in each group. Group A received normal saline(NS) 30 mL and sufen-tanil 45 μg;Group B received NS 30 mL and sufentanil 60 jug; Group C received NS 30 mL and sufentanil 75 μg; Group D received NS 30 mL and sufentanil 90 jug. Patient controlled analgesia (PCA) regimens were: backgroud dose 2 mL, continuate injection dose 2 mL · h ‐1

  3. [Fentanyl in peridural obstetrical analgesia. Evaluation after 4 years' use].

    Science.gov (United States)

    Lévêque, C; Garen, C; Pathier, D; Mazuir, E; Maneglia, R; Janse-Marec, J; Cousin, M T

    1987-01-01

    7,500 deliveries occurred from the date of opening of the Maternity Hospital Jean-Rostand. 3,500 of these were conducted under epidural anaesthesia. At different stages prospective studies were carried out to recall the effect of adding fentanyl to bupivacaine when the epidural injection was made. A pharmacokinetic study. This shows that the levels in the mother and the fetus begin to coincide more with the number of doses that are given and pass from 0.3 after 50 micrograms have been administered to 0.5 after 100 micrograms have been administered and 0.7 after 150 micrograms have been administered. The fetal levels are far lower than those required to depress respiration. The half life of distribution through the circulation has been worked out at 4 minutes and the half for elimination of the drug at 460 minutes. The maternal levels show great fluctuations and late alterations. Analgesia is earlier, more complete and more prolonged when fentanyl is added. Fentanyl also masks irregularities. Undesirable effects such as tiredness, pruritus, nausea, vomiting and urinary retention occur infrequently and last only for short periods of time. No mother had respiratory depression. The doses of bupivacaine that had to be given were as a whole less when fentanyl was added. In 40% of cases it only required one injection to achieve analgesia throughout the whole labour. The length of labour and the number of caesarean operations carried out did not change.(ABSTRACT TRUNCATED AT 250 WORDS) PMID:3584862

  4. [Perioperative analgesia with continuous peripheral nerve blocks in children].

    Science.gov (United States)

    Dadure, C; Capdevila, X

    2007-02-01

    Recently, regional anaesthesia in children has generated increasing interest. But single injection techniques have a limited duration of postoperative analgesia. Then, continuous peripheral nerve blocks have taken an important position in the anaesthetic arsenal, allowing an effective, safe and prolonged postoperative pain management. As adults, indications for continuous peripheral nerve blocks depend on the analysis of individual benefits/risks ratio. Main indications are intense postoperative pain surgical procedures, with or without postoperative rehabilitation, and complex regional pain syndrome. Contraindications to these procedures are rather similar to those in adults, plus parental and/or children refusal. Continuous peripheral nerve blocks are usually performed under general anaesthesia or sedation in children, and require appropriate equipment in order to decrease the risk of nerve injury. New techniques, such as transcutaneous nerve stimulation or ultrasound guidance, appeared to facilitate nerve and plexus approach identification in paediatric patients. Nevertheless, continuous peripheral nerve block may theoretically mask a compartment syndrome after trauma surgical procedures. Finally, ropivacaine appears to be the most appropriate drug for continuous peripheral nerve blocks in children, requiring low flow rates and concentrations of local anaesthetic. These techniques may facilitate early ambulation by an improved pain management or even postoperative analgesia at home with disposable pumps. One might infer from the current review that excellent pain relief coupled with a reduction of side effects would contribute to improve the quality of life and to decrease the frequency of disabling behavioural modifications in children, sometimes psychologically injured by hospital stay and postoperative pain. PMID:17174518

  5. Research and Implementation of PCA Face Recognition Algorithm Based on Matlab

    Directory of Open Access Journals (Sweden)

    Fu Qi

    2015-01-01

    Full Text Available This paper researches the theory of PCA (Principle Component Analysis algorithm and the feature extraction elements in the process of face recognition, summarizes application procedures of PCA algorithm in the process face recognition, and realizes the application of PCA algorithm in the process face recognition in the matlab software. The research content and realization results show that: PCA algorithm is a kind of algorithm which is very suitable for programming and realization of matlab software; the key factor to realize PCA algorithm is the selection of the number of feature vectors, which affects the recognition rate and training time of the space sample subset. The higher recognition rate indicates better results in the algorithm implementation; the shorter training time of the space sample subset indicates more excellent algorithm implementation. In the process of selection of the number of feature vectors, on one hand, there is a need to protect the recognition rate; on the other hand, there is a need to control training time of the space sample subset, in which the recognition rate is a rigid target. The shortest training time of the subset of samples is selected on the premise of meeting the recognition rate.

  6. Application of PCA and HCA to the Structure-activity Relationship (SAR) Study of Fluoroquinolones

    Institute of Scientific and Technical Information of China (English)

    LI Xiao-Hong; ZHANG Rui-hou; CHENG Xin-Lu; YANG Xiang-Dong

    2006-01-01

    Density functional theory (DFT) was used to calculate a set of molecular descriptors (properties) for 14 fluoroquinolones with anti-B.fragilis activity. Principal component analysis (PCA) and hierarchical cluster analysis (HCA) were employed in order to reduce dimensionality and investigate which subset of variables should be more effective for classifying fluoroquinolones according to their an-B.fragilis activity degree. The PCA shows that the variables of ELUMO, △EHL, μ, Q2, Q3, Q5, Q6, QB, LogP, MR and MP are responsible for the separation between compounds with higher and lower anti-B.fragilis activities. The HCA results are similar to those obtained with PCA. By using the chemometric results, 4 synthetic compounds were analyzed through PCA and HCA, and 2 of them are proposed as active molecules against B.fragilis, which is consistent with the results of clinic experiments. The methodologies of PCA and HCA provide a reliable rule for classifying new fluoroquinolones with anti-B.fragilis activity.

  7. 2D-3D Face Recognition Method Based on a Modified CCA-PCA Algorithm

    Directory of Open Access Journals (Sweden)

    Patrik Kamencay

    2014-03-01

    Full Text Available This paper presents a proposed methodology for face recognition based on an information theory approach to coding and decoding face images. In this paper, we propose a 2D-3D face-matching method based on a principal component analysis (PCA algorithm using canonical correlation analysis (CCA to learn the mapping between a 2D face image and 3D face data. This method makes it possible to match a 2D face image with enrolled 3D face data. Our proposed fusion algorithm is based on the PCA method, which is applied to extract base features. PCA feature-level fusion requires the extraction of different features from the source data before features are merged together. Experimental results on the TEXAS face image database have shown that the classification and recognition results based on the modified CCA-PCA method are superior to those based on the CCA method. Testing the 2D-3D face match results gave a recognition rate for the CCA method of a quite poor 55% while the modified CCA method based on PCA-level fusion achieved a very good recognition score of 85%.

  8. 基于SIFT,PCA-SIFT和SURF特征检测方法的研究%Based on SIFT,PCA-SIFT and SURF Feature Detection Method Research

    Institute of Scientific and Technical Information of China (English)

    李宏荣; 李晓明

    2012-01-01

    To study features,we compared with SIFT(Scale Invariant Feature Transform),PCA-SIFT(Principal Component Analysis Scale Invariant Feature Transform)and SURF(Speeded Up Robust Features)three kinds of robust feature detection method.We use KNN(K-Nearest Neighbor)and random sampling method of these three kinds of methods for analysis.Where KNN used to seek matching pairs,random sampling for removing errors from match to match.Feature detection performance robustness is the image rotation,image blurring,illumination variation,the scale change of the image.The experimental evaluation is the use of repetition rate and the number of correct matching of the two statistical methods.In a variety of image transform in SIFT and SURF performance is consistent,but also has faster calculation speed.PCA-SIFT in the image rotation and illumination changes provides a better performance.%文章对SIFT,PCA-SIFT和SURF三种鲁棒性较强的特征检测方法作对比.文中运用KNN(K-Nearest Neighbor)和RANSAC的方法对这三种方法进行分析.其中KNN用于寻求匹配对,RANSAC用于从匹配对中剔除错误匹配.特征检测性能的鲁棒性主要是对图像旋转、图像模糊、光照变化、尺度变化下的图像进行测试.在各种图像变换中SIFT都体现出了稳定性,但计算速度相对比较慢.SURF不仅与SIFT的性能相一致,而且还拥有较快的计算速度.PCA-SIFT在图像旋转和光照变化中有较好的性能.

  9. Integration of chemotaxis, transport and catabolism in Pseudomonas putida and identification of the aromatic acid chemoreceptor PcaY.

    Science.gov (United States)

    Luu, Rita A; Kootstra, Joshua D; Nesteryuk, Vasyl; Brunton, Ceanne N; Parales, Juanito V; Ditty, Jayna L; Parales, Rebecca E

    2015-04-01

    Aromatic and hydroaromatic compounds that are metabolized through the β-ketoadipate catabolic pathway serve as chemoattractants for Pseudomonas putida F1. A screen of P. putida F1 mutants, each lacking one of the genes encoding the 18 putative methyl-accepting chemotaxis proteins (MCPs), revealed that pcaY encodes the MCP required for metabolism-independent chemotaxis to vanillate, vanillin, 4-hydroxybenzoate, benzoate, protocatechuate, quinate, shikimate, as well as 10 substituted benzoates that do not serve as growth substrates for P. putida F1. Chemotaxis was induced during growth on aromatic compounds, and an analysis of a pcaY-lacZ fusion revealed that pcaY is expressed in the presence of β-ketoadipate, a common intermediate in the pathway. pcaY expression also required the transcriptional activator PcaR, indicating that pcaY is a member of the pca regulon, which includes three unlinked gene clusters that encode five enzymes required for the conversion of 4-hydroxybenzoate to tricarboxylic acid cycle intermediates as well as the major facilitator superfamily transport protein PcaK. The 4-hydroxybenzoate permease PcaK was shown to modulate the chemotactic response by facilitating the uptake of 4-hydroxybenzoate, which leads to the accumulation of β-ketoadipate, thereby increasing pcaY expression. The results show that chemotaxis, transport and metabolism of aromatic compounds are intimately linked in P. putida. PMID:25582673

  10. Safety of 96-hour incision-site continuous infusion of ropivacaine for postoperative analgesia after bowel cancer resection.

    Science.gov (United States)

    Corso, Olivia H; Morris, Raymond G; Hewett, Peter J; Karatassas, Alex

    2007-02-01

    The aim of this study was to examine the safety of ropivacaine given to patients as a continuous infusion [0.2% (2 mg/mL), 5 mL/h for 96 hours] into a right lateral transverse incision using a portable elastomeric infusion pump after colon cancer resection. Blood samples were collected throughout the infusion and up to 12 hours after infusion and were analyzed by high-performance liquid chromatography (HPLC) for total and unbound ropivacaine concentrations in plasma. Alpha1 acid glycoprotein (AAG) concentrations were measured at 0 and 48 hours to assess possible changes in ropivacaine protein binding after surgery. Postoperative pain control was assessed using 12 hour visual analog scale (VAS) scores. Patient-controlled analgesia (PCA) using fentanyl was freely available in parallel for breakthrough pain, with usage and consumption compared with a historical cohort. The mean +/- SD Cmax total plasma ropivacaine concentration (n = 5) from 12 hours to the end of the infusion was 4.5 +/- 2.6 mg/L, comparable with the previously published threshold for CNS toxicity in the most sensitive patient studied (3.4 mg/L). However, the corresponding maximum unbound ropivacaine concentration (ie, the pharmacologically active moiety) of 0.07 +/- 0.01 mg/L ranged from four- to sevenfold below the reported toxicity threshold (0.34 mg/L). The apparently greater safety margin seen with unbound ropivacaine may have resulted from a significant increase (mean 63%, P < 0.05) in AAG concentrations measured at 48 hours after surgery. This reduction resulted from the known AAG reaction after surgical intervention, resulting in a reducing unbound ropivacaine fraction throughout the 96 hour infusion in all patients. Mean subjective 12 hour pain scale scores at rest and on movement showed large variability between patients. No signs or symptoms of ropivacaine toxicity were observed or reported on questioning. In this limited sample, extending the infusion period from the presently approved 48

  11. Facial expression recognition based on fused Feature of PCA and LDP

    Science.gov (United States)

    Yi, Zhang; Mao, Hou-lin; Luo, Yuan

    2014-11-01

    Facial expression recognition is an important part of the study in man-machine interaction. Principal component analysis (PCA) is an extraction method based on statistical features which were extracted from the global grayscale features of the whole image .But the grayscale global features are environmentally sensitive. In order to recognize facial expression accurately, a fused method of principal component analysis and local direction pattern (LDP) is introduced in this paper. First, PCA extracts the global features of the whole grayscale image; LDP extracts the local grayscale texture features of the mouth and eyes region, which contribute most to facial expression recognition, to complement the global grayscale features of PCA. Then we adopt Support Vector Machine (SVM) classifier for expression classification. Experimental results demonstrate that this method can classify different expressions more effectively and get higher recognition rate compared with the traditional method.

  12. COMBINING PCA ANALYSIS AND ARTIFICIAL NEURAL NETWORKS IN MODELLING ENTREPRENEURIAL INTENTIONS OF STUDENTS

    Directory of Open Access Journals (Sweden)

    Marijana Zekić-Sušac

    2013-02-01

    Full Text Available Despite increased interest in the entrepreneurial intentions and career choices of young adults, reliable prediction models are yet to be developed. Two nonparametric methods were used in this paper to model entrepreneurial intentions: principal component analysis (PCA and artificial neural networks (ANNs. PCA was used to perform feature extraction in the first stage of modelling, while artificial neural networks were used to classify students according to their entrepreneurial intentions in the second stage. Four modelling strategies were tested in order to find the most efficient model. Dataset was collected in an international survey on entrepreneurship self-efficacy and identity. Variables describe students’ demographics, education, attitudes, social and cultural norms, self-efficacy and other characteristics. The research reveals benefits from the combination of the PCA and ANNs in modeling entrepreneurial intentions, and provides some ideas for further research.

  13. A MEDICAL MULTI-MODALITY IMAGE FUSION OF CT/PET WITH PCA, DWT METHODS

    Directory of Open Access Journals (Sweden)

    S. Guruprasad

    2013-11-01

    Full Text Available This paper gives a view on the fusion of different modality images like PET and CT (Positron Emission Tomography & Computed Tomography by two domain methods PCA and DWT methods. The spatial domain is PCA method, and another transformation domain method (DWT. In dwt decomposed coefficients of DWT (discrete wavelet transformation are applied with the IDWT to get fused image information. Before that, choose a detailed part of decomposed coefficients by maximum selection and averaging the approximated part of DWT coefficients. In applying the PCA using eigen values and eigen vector of larger values as principal components and after to reconstruct using addition to these to get the fussed image of two modalities CT & PET. So that adds complimentary features of both anatomic, physiological and metabolic information in one image, provides better visual information in single image of patients in medical field. The analytic parameters like, MSE, PSNR, ENTROPY results are better enough to prove the methods each other.

  14. Fault diagnosis for power system transmission line based on PCA and SVMs

    Energy Technology Data Exchange (ETDEWEB)

    Guo, Yuanjun; Li, Kang; Liu, Xueqin [Queen' s Univ., Belfast (United Kingdom). School of Electronics, Electrical Engineering and Computer Science

    2013-07-01

    This paper presents the application of a fault detection method based on the principal component analysis (PCA) and support vector machine (SVM) for the detection and classification of faults in power system transmission lines. Consider that the data may be huge with a number of strongly correlated variables, method which incorporates both the principal component analysis (PCA) and support vector machine (SVM) is proposed. This algorithm has two stages. The first stage involves the use of the PCA to reduce the dimensionality as well as to find violating point of the signals according to the confidential limit. The features of each fault extracted from the data are used in the second stage to construct SVM networks. The second stage is to use pattern recognition method to distinguish the phase of the faulty situation. The proposed scheme is able to solve the problems encountered in traditional magnitude and frequency based methods. The benefits of this improvement are demonstrated.

  15. PCA-FA:Applying Supervised Learning to Analyze Gene Expression Data

    Institute of Scientific and Technical Information of China (English)

    翁时锋; 张长水; 张学工

    2004-01-01

    In previous gene expression data analyses,supervised learning has mainly focused on the classification of attribute data,such as the different experimental conditions,different known classes of the same tumor and sex.However,supervised learning classification is not suitable for interval-scaled attributes,such as age and survival outcome of cancer patients.For this problem,this paper proposed a new method by combining two well-known methods: principal component analysis (PCA) and Fisher analysis (FA).The method,PCA-FA,realizes supervised learning with two types of attributes (nominal attributes and interval-scaled attributes).The fuzzy FA was introduced to model the interval-scaled attributes.In this paper,an approximate linear relationship between gene expression data of lung adenocarcinoma patients and survival outcome is successfully revealed by PCA-TA.

  16. Assisting informed decision making for labour analgesia: a randomised controlled trial of a decision aid for labour analgesia versus a pamphlet

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    Torvaldsen Siranda

    2010-04-01

    Full Text Available Abstract Background Most women use some method of pain relief during labour. There is extensive research evidence available of pharmacological pain relief during labour; however this evidence is not readily available to pregnant women. Decision aids are tools that present evidence based information and allow preference elicitation. Methods We developed a labour analgesia decision aid. Using a RCT design women either received a decision aid or a pamphlet. Eligible women were primiparous, ≥ 37 weeks, planning a vaginal birth of a single infant and had sufficient English to complete the trial materials. We used a combination of affective (anxiety, satisfaction and participation in decision-making and behavioural outcomes (intention and analgesia use to assess the impact of the decision aid, which were assessed before labour. Results 596 women were randomised (395 decision aid group, 201 pamphlet group. There were significant differences in knowledge scores between the decision aid group and the pamphlet group (mean difference 8.6, 95% CI 3.70, 13.40. There were no differences between decisional conflict scores (mean difference -0.99 (95% CI -3.07, 1.07, or anxiety (mean difference 0.3, 95% CI -2.15, 1.50. The decision aid group were significantly more likely to consider their care providers opinion (RR 1.28 95%CI 0.64, 0.95. There were no differences in analgesia use and poor follow through between antenatal analgesia intentions and use. Conclusions This decision aid improves women's labour analgesia knowledge without increasing anxiety. Significantly, the decision aid group were more informed of labour analgesia options, and considered the opinion of their care providers more often when making their analgesia decisions, thus improving informed decision making. Trial Registration Trial registration no: ISRCTN52287533

  17. Controversies in using urine samples for prostate cancer detection: PSA and PCA3 expression analysis

    Directory of Open Access Journals (Sweden)

    S. Fontenete

    2011-12-01

    Full Text Available PURPOSE: Prostate cancer (PCa is one of the most commonly diagnosed malignancies in the world. Although PSA utilization as a serum marker has improved prostate cancer detection it still presents some limitations, mainly regarding its specificity. The expression of this marker, along with the detection of PCA3 mRNA in urine samples, has been suggested as a new approach for PCa detection. The goal of this work was to evaluate the efficacy of the urinary detection of PCA3 mRNA and PSA mRNA without performing the somewhat embarrassing prostate massage. It was also intended to optimize and implement a methodological protocol for this kind of sampling. MATERIALS AND METHODS: Urine samples from 57 patients with suspected prostate disease were collected, without undergoing prostate massage. Increased serum PSA levels were confirmed by medical records review. RNA was extracted by different methods and a preamplification step was included in order to improve gene detection by Real-Time PCR. RESULTS: An increase in RNA concentration with the use of TriPure Isolation Reagent. Despite this optimization, only 15.8% of the cases showed expression of PSA mRNA and only 3.8% of prostate cancer patients presented detectable levels of PCA3 mRNA. The use of a preamplification step revealed no improvement in the results obtained. CONCLUSION: This work confirms that prostate massage is important before urine collection for gene expression analysis. Since PSA and PCA3 are prostate specific, it is necessary to promote the passage of cells from prostate to urinary tract, in order to detect these genetic markers in urine samples.

  18. Morphine- and buprenorphine-induced analgesia and antihyperalgesia in a human inflammatory pain model

    DEFF Research Database (Denmark)

    Ravn, Pernille; Secher, EL; Skram, U;

    2013-01-01

    Opioid therapy is associated with the development of tolerance and paradoxically increased sensitivity to pain. It has been suggested that buprenorphine is associated with a higher antihyperalgesia/analgesia ratio than μ-opioid receptor agonists. The primary outcome of this study was therefore to...... investigate relative differences in antihyperalgesia and analgesia effects between morphine and buprenorphine in an inflammatory pain model in volunteers. The secondary outcome was to examine the relationship between pain sensitivity and opioid-induced effects on analgesia, antihyperalgesia, and descending...... pain modulation....

  19. La sinergia farmacológica aplicada a la analgesia: revisión de la combinación de ibuprofeno con codeína Pharmacological synergy applied to analgesia: review of the combination of ibuprofen with codeine

    Directory of Open Access Journals (Sweden)

    J.R. González-Escalada

    2010-02-01

    Full Text Available La analgesia multimodal que participa actualmente en todos los protocolos de analgesia postoperatoria también se utiliza por los especialistas en dolor crónico que manejan la combinación de fármacos como una rutina para optimizar la eficacia de la analgesia; la combinación de fármacos es una práctica bien conocida y muy extendida, gracias a su demostrada rentabilidad terapéutica, y habitualmente se utiliza tanto en anestesia como en analgesia. El concepto del balance adecuado entre efectividad y seguridad es primordial, y aunque la calidad del tratamiento aplicado se mide según el alivio conseguido, el confort se evalúa teniendo en cuenta la combinación entre eficacia analgésica y la ausencia o mínima presencia de efectos secundarios, siendo primordial en el tratamiento del paciente con dolor. En este sentido, parece claro que la búsqueda de las dosis mínimas eficaces de cada fármaco es una premisa necesaria para plantear la combinación de dosis idónea. La búsqueda de los fármacos que deben componer una combinación y las dosis a emplear debe ser fruto de la investigación, pero debe ser corroborada por la experiencia clínica, la opinión de los expertos y las evidencias publicadas. En este trabajo, se realiza una extensa revisión de la experiencia clínica existente con la combinación de ibuprofeno con codeína, haciendo un análisis de los antecedentes históricos que llevaron a su uso, los trabajos que permitieron demostrar su sinergia y compatibilidad farmacocinética y los trabajos pioneros de investigación clínica que permitieron concluir que la dosis fija idónea de esta combinación es la mezcla de 400 mg de ibuprofeno con 30 mg de codeína. Es difícil sacar conclusiones acerca de la efectividad analgésica de los diferentes antiinflamatorios no esteroideos, pero no cabe duda que según los datos acumulados hasta la actualidad, el ibuprofeno se sitúa entre los más efectivos y es una buena opción para

  20. How accurate is our prediction of biopsy outcome? PCA3-based nomograms in personalized diagnosis of prostate cancer

    OpenAIRE

    Salagierski, Maciej; Sosnowski, Marek; Schalken, Jack A.

    2012-01-01

    Purpose The sensitivity and specificity of prostate-specific antigen (PSA) alone to select men for prostate biopsy remain suboptimal. This review aims at presenting a review of current prostate cancer (PCa) nomograms that incorporate Prostate Cancer Gene 3 (PCA3), which was designed to outperform PSA at predicting biopsy outcome. Materials and methods The PubMed database and current literature search was conducted for reports on PCA3-based nomograms and tools for examining the risk of a posit...

  1. Imaging-guided hyperstimulation analgesia in low back pain

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    Gorenberg M

    2013-06-01

    Full Text Available Miguel Gorenberg,1,2 Kobi Schwartz31Department of Nuclear Medicine, B'nai Zion Medical Center, Haifa, Israel; 2The Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa, Israel; 3Department of Physical Therapy, B'nai Zion Medical Center, Haifa, IsraelAbstract: Low back pain in patients with myofascial pain syndrome is characterized by painful active myofascial trigger points (ATPs in muscles. This article reviews a novel, noninvasive modality that combines simultaneous imaging and treatment, thus taking advantage of the electrodermal information available from imaged ATPs to deliver localized neurostimulation, to stimulate peripheral nerve endings (Aδ fibers and in turn, to release endogenous endorphins. "Hyperstimulation analgesia" with localized, intense, low-rate electrical pulses applied to painful ATPs was found to be effective in 95% patients with chronic nonspecific low back pain, in a clinical validation study.Keywords: myofascial, noninvasive, electrical, impedance

  2. The Role for Epigenetic Modifications in Pain and Analgesia Response

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    Sherrie Lessans

    2013-01-01

    Full Text Available Pain remains a poorly understood and managed symptom. A limited mechanistic understanding of interindividual differences in pain and analgesia response shapes current approaches to assessment and treatment. Opportunities exist to improve pain care through increased understanding of how dynamic epigenomic remodeling shapes injury, illness, pain, and treatment response. Tightly regulated alterations of the DNA-histone chromatin complex enable cells to control transcription, replication, gene expression, and protein production. Pathological alterations to chromatin shape the ability of the cell to respond to physiologic and environmental cues leading to disease and reduced treatment effectiveness. This review provides an overview of critical epigenetic processes shaping pathology and pain, highlights current research support for the role of epigenomic modification in the development of chronic pain, and summarizes the therapeutic potential to alter epigenetic processes to improve health outcomes.

  3. Controversy of the use of epidural analgesia in labour

    Directory of Open Access Journals (Sweden)

    Enrique Ramón Arbués

    2008-11-01

    Full Text Available During last years, it was thought that free-pain labour was a big advance for woman. Recently, ideological patrons such as ecofeminism have feed a critical mind in the woman who is going to give birth. In this bibliographic review we don’t approach a reliable and definitive conclusion, due to the bias and lack of scientific rigour of some studies and the doubtful methodological reliability and generalization of others.This way, we conclude the need to make a tolerant effort on the part of everyone, just as researching and assuming on the services portfolio (if needed alternative techniques such as combined spinal-epidural analgesia, sterile water injections, water immersion, acupuncture, hypnosis, etc.

  4. Glia: novel counter-regulators of opioid analgesia.

    Science.gov (United States)

    Watkins, Linda R; Hutchinson, Mark R; Johnston, Ian N; Maier, Steven F

    2005-12-01

    Development of analgesic tolerance and withdrawal-induced pain enhancement present serious difficulties for the use of opioids for pain control. Although neuronal mechanisms to account for these phenomena have been sought for many decades, their bases remain unresolved. Within the past four years, a novel non-neuronal candidate has been uncovered that opposes acute opioid analgesia and contributes to development of opioid tolerance and tolerance-associated pain enhancement. This novel candidate is spinal cord glia. Glia are important contributors to the creation of enhanced pain states via the release of neuroexcitatory substances. New data suggest that glia also release neuroexcitatory substances in response to morphine, thereby opposing its effects. Controlling glial activation could therefore increase the clinical utility of analgesic drugs. PMID:16246435

  5. Bloqueio extraconal para facectomia com implante de lente intra-ocular: influência do fentanil associado ao anestésico local na qualidade do bloqueio e na analgesia pós-operatória Bloqueo extraconal para facectomia con implantación de lente intra-ocular: influencia del fentanil asociado al anestésico local en la calidad del bloqueo y en la analgesia pos-operatoria Extraconal block for cataract extraction surgery with implantation of intraocular lens: contribution of fentanyl associated to local anesthetics for quality of block and postoperative analgesia

    Directory of Open Access Journals (Sweden)

    Daniel Espada Lahoz

    2003-09-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: A anestesia locorregional para cirurgias oftalmológicas oferece vantagens, como: mínimas alterações fisiológicas, anestesia completa, bloqueio dos reflexos oculares, pequena incidência de náuseas e vômitos, menor tempo de recuperação e analgesia pós-operatória. A preocupação constante com a qualidade do bloqueio, assim como da abordagem da analgesia pós-operatória deve ficar sob a responsabilidade do anestesiologista. O objetivo deste estudo foi avaliar se o fentanil contribui na qualidade do bloqueio extraconal e na analgesia pós-operatória de facectomias com implante de lente intra-ocular. MÉTODO: Estudou-se a associação do fentanil e bupivacaína a 0,75% na qualidade do bloqueio ocular e na analgesia pós-operatória em 164 pacientes submetidos a facectomia com implante de lente intra-ocular (técnica extracapsular, de ambos os sexos com homogeneidade de parâmetros antropométricos, olho operado, classificação do estado físico (ASA e índice de risco cardíaco de Goldman. Os pacientes foram distribuídos em dois grupos (82 pacientes em cada grupo por sorteio de forma aleatória, com e sem fentanil. Avaliou-se a qualidade do bloqueio por: aparecimento da dor no per-operatório, manutenção de movimentação das pálpebras ou do globo ocular, persistência do reflexo de Bell, número de bloqueios realizados para a obtenção de condições cirúrgicas e avaliação do bloqueio pelo cirurgião. A analgesia pós-operatória foi avaliada pela necessidade de complementação analgésica pelo paciente. RESULTADOS: Fentanil associado à solução anestésica no bloqueio extraconal aumentou significativamente o bloqueio do músculo reto medial (com fentanil - 17,1%, sem fentanil - 32,9% e diminuiu o consumo de analgésicos no período pós-operatório (uso de analgésicos com fentanil - 20,7%, não uso de analgésicos com fentanil - 41,5%. CONCLUSÕES: Nas condições deste estudo o fentanil

  6. Blockade of tolerance to morphine analgesia by cocaine.

    Science.gov (United States)

    Misra, A L; Pontani, R B; Vadlamani, N L

    1989-07-01

    Tolerance to morphine analgesia was induced in male Sprague-Dawley rats by s.c. implantation of a morphine base pellet (75 mg) on the first and second day and determining the magnitude of tolerance 72 h after the first implant by s.c. injection of a test dose of morphine (5 mg/kg). Implantation of a cocaine hydrochloride pellet (25 mg), concurrently with morphine pellets or of a cocaine hydrochloride (50 mg) pellet after the development of tolerance, blocked both the development and expression of morphine analgesic tolerance. In morphine-pelleted animals pretreatment for 3 days with desipramine or zimelidine or phenoxybenzamine but not haloperidol produced no significant morphine tolerance. Pretreatment with a combination of desipramine and zimelidine, however, was as effective as cocaine in blocking morphine tolerance. Alpha-Methyl-p-tyrosine methyl ester counteracted the effect of cocaine in blocking morphine tolerance and potentiated the tolerance development. Blockade of morphine tolerance by cocaine was reinforced and facilitated by pretreatment with fenfluramine or p-chlorophenylalanine ethyl ester and to a lesser extent by clonidine and haloperidol. Acute administration of fenfluramine or zimelidine or a combination of desipramine and zimelidine or alpha-methyl-p-tyrosine methyl ester or p-chlorophenylalanine ethyl ester did not significantly affect morphine analgesia. The study suggests an important role of the concomitant depletion of both central noradrenaline and serotonin in the blockade of morphine tolerance by cocaine and stresses the importance of the counter-balancing functional relationship between these two neurotransmitters in the central nervous system. PMID:2780065

  7. Intrathecal ketorolac enhances intrathecal morphine analgesia following total knee arthroplasty

    Directory of Open Access Journals (Sweden)

    Gabriela R Lauretti

    2013-01-01

    Full Text Available Background: Total knee arthroplasty represents one of the most painful surgeries. The aim of the study was to compare analgesia and adverse effects of intrathecal (IT ketorolac versus IT morphine, versus the combination of IT ketorolac and morphine. Materials and Methods: After ethical approval and patient consent, 80 patients undergoing knee arthroplasty were randomized to one of 4 groups. All groups received 15 mg IT bupivacaine plus IT test drug (2 ml. The control group (CG received saline as IT test drug. The morphine group (MG received IT 200 g morphine, the ketorolac group (KG IT 2 mg ketorolac and the morphine-ketorolac group (MKG 200 g morphine + 2 mg ketorolac as test drugs. Pain and adverse effects were evaluated. P < 0.05 was considered significant. Results: The MG and KG were similar in their times to time to first rescue analgesic (440 ± 38 min and 381 ± 44 min, respectively. Both groups were longer when compared to the CG (170 ± 13 min (P < 0.01. The MG and KG had lesser ketoprofen consumption compared to the CG (P < 0.05. The time to first rescue analgesic was longer to the MKG (926 ± 222 min (15 h compared to CG (P < 0.001 and to the MG and the KG (P < 0.01. MKG displayed lesser ketoprofen consumption compared to MG and KG (P < 0.05 and to the CG (P < 0.02. Conclusions: The data suggest a role for spinal ketorolac and morphine in orthopaedic surgery because this combination of agents provided 15 h of analgesia compared to 7 h after each drug alone, with no significant side-effects.

  8. Randomized comparison of effectiveness of unimodal opioid analgesia with multimodal analgesia in post–cesarean section pain management

    Directory of Open Access Journals (Sweden)

    Adeniji AO

    2013-05-01

    Full Text Available Adetunji Oladeni Adeniji,1 Oluseyi Olaboyede A Atanda21Department of Obstetrics and Gynaecology, Ladoke Akintola University of Technology, Ogbomoso, Nigeria; 2Department of Obstetrics and Gynaecology, Ladoke Akintola University of Technology Teaching Hospital, Osogbo, NigeriaBackground: Postoperative pain leads to patient discomfort, decreased level of satisfaction, prolonged recovery, and higher health costs. Acute pain control therefore improves the overall quality of life in patients undergoing cesarean section. Pain relief is a fundamental human right, but there is no gold standard for post–cesarean section pain management.Objective: To compare the efficacy of pentazocine and tramadol used in unimodal and multimodal (in combination with piroxicam approach, in the management of post–cesarean section pain.Materials and methods: This study employed a random allocation design to compare the effectiveness of intramuscular pentazocine (60 mg or tramadol (100 mg as single analgesic agent and in combination with daily intramuscular piroxicam 20 mg, for the management of post–cesarean section pain during the immediate 12 hours after surgery. The primary outcome measure was control of postoperative pain, while the secondary outcome measures were the analgesic agent onset of action, duration of action, patient satisfaction, and maternal and neonatal adverse outcomes. Data obtained were entered into a predesigned sheet and analyzed with the Statistical Package for Social Sciences version 17. Means ± standard deviation (SD were calculated for the quantitative variables, and the difference between two independent groups was compared using unpaired Student's t-test. The level of significance was set at 0.05.Results: A total of 120 patients were equally and randomly allocated to four study groups – two that received unimodal analgesia (the pentazocine group and the tramadol group and two that received multimodal analgesia (the pentazocine

  9. PCA3 noncoding RNA is involved in the control of prostate-cancer cell survival and modulates androgen receptor signaling

    International Nuclear Information System (INIS)

    PCA3 is a non-coding RNA (ncRNA) that is highly expressed in prostate cancer (PCa) cells, but its functional role is unknown. To investigate its putative function in PCa biology, we used gene expression knockdown by small interference RNA, and also analyzed its involvement in androgen receptor (AR) signaling. LNCaP and PC3 cells were used as in vitro models for these functional assays, and three different siRNA sequences were specifically designed to target PCA3 exon 4. Transfected cells were analyzed by real-time qRT-PCR and cell growth, viability, and apoptosis assays. Associations between PCA3 and the androgen-receptor (AR) signaling pathway were investigated by treating LNCaP cells with 100 nM dihydrotestosterone (DHT) and with its antagonist (flutamide), and analyzing the expression of some AR-modulated genes (TMPRSS2, NDRG1, GREB1, PSA, AR, FGF8, CdK1, CdK2 and PMEPA1). PCA3 expression levels were investigated in different cell compartments by using differential centrifugation and qRT-PCR. LNCaP siPCA3-transfected cells significantly inhibited cell growth and viability, and increased the proportion of cells in the sub G0/G1 phase of the cell cycle and the percentage of pyknotic nuclei, compared to those transfected with scramble siRNA (siSCr)-transfected cells. DHT-treated LNCaP cells induced a significant upregulation of PCA3 expression, which was reversed by flutamide. In siPCA3/LNCaP-transfected cells, the expression of AR target genes was downregulated compared to siSCr-transfected cells. The siPCA3 transfection also counteracted DHT stimulatory effects on the AR signaling cascade, significantly downregulating expression of the AR target gene. Analysis of PCA3 expression in different cell compartments provided evidence that the main functional roles of PCA3 occur in the nuclei and microsomal cell fractions. Our findings suggest that the ncRNA PCA3 is involved in the control of PCa cell survival, in part through modulating AR signaling, which may raise new

  10. PCA3 noncoding RNA is involved in the control of prostate-cancer cell survival and modulates androgen receptor signaling

    Directory of Open Access Journals (Sweden)

    Ferreira Luciana Bueno

    2012-11-01

    Full Text Available Abstract Background PCA3 is a non-coding RNA (ncRNA that is highly expressed in prostate cancer (PCa cells, but its functional role is unknown. To investigate its putative function in PCa biology, we used gene expression knockdown by small interference RNA, and also analyzed its involvement in androgen receptor (AR signaling. Methods LNCaP and PC3 cells were used as in vitro models for these functional assays, and three different siRNA sequences were specifically designed to target PCA3 exon 4. Transfected cells were analyzed by real-time qRT-PCR and cell growth, viability, and apoptosis assays. Associations between PCA3 and the androgen-receptor (AR signaling pathway were investigated by treating LNCaP cells with 100 nM dihydrotestosterone (DHT and with its antagonist (flutamide, and analyzing the expression of some AR-modulated genes (TMPRSS2, NDRG1, GREB1, PSA, AR, FGF8, CdK1, CdK2 and PMEPA1. PCA3 expression levels were investigated in different cell compartments by using differential centrifugation and qRT-PCR. Results LNCaP siPCA3-transfected cells significantly inhibited cell growth and viability, and increased the proportion of cells in the sub G0/G1 phase of the cell cycle and the percentage of pyknotic nuclei, compared to those transfected with scramble siRNA (siSCr-transfected cells. DHT-treated LNCaP cells induced a significant upregulation of PCA3 expression, which was reversed by flutamide. In siPCA3/LNCaP-transfected cells, the expression of AR target genes was downregulated compared to siSCr-transfected cells. The siPCA3 transfection also counteracted DHT stimulatory effects on the AR signaling cascade, significantly downregulating expression of the AR target gene. Analysis of PCA3 expression in different cell compartments provided evidence that the main functional roles of PCA3 occur in the nuclei and microsomal cell fractions. Conclusions Our findings suggest that the ncRNA PCA3 is involved in the control of PCa cell survival

  11. Análisis de la no elección de la analgesia epidural durante el trabajo de parto en las mujeres andaluzas: "la buena sufridora"

    Directory of Open Access Journals (Sweden)

    L. Biedma Velázquez

    2010-02-01

    Full Text Available Introducción: La analgesia epidural se ha popularizado en España, tanto en su conocimiento como en su uso, a lo largo de los últimos 20 años. La elección de esta técnica analgésica por parte de la futura madre durante el trabajo de parto y el parto en Andalucía es un derecho de la mujer que, explícitamente, sólo estará limitado por sus condiciones físicas y de salud y por los recursos disponibles en el hospital en el momento del parto. Esta elección pone en relación 2 elementos: por un lado, el componente cognitivo que establece la conveniencia o no de utilizar esta técnica según los valores, percepciones, cultura, etc. de la mujer y, por otro, el componente conductual, es decir, el uso o no de la técnica en cuestión, que dependerá además de la elección de la mujer de las condiciones anteriormente mencionadas. Objetivo: Analizar qué características definen a las mujeres que, aun pudiendo, deciden no utilizar analgesia epidural durante el parto en Andalucía. Material y métodos: Para ello se ha utilizado la información proporcionada por las mujeres ingresadas por parto en los hospitales del Sistema Sanitario Público de Andalucía, contenida en las encuestas anuales de satisfacción de usuarios del sistema de atención hospitalario en esta comunidad autónoma entre los años 2000 y 2007. Con esta información se ha realizado un análisis de segmentación jerárquica que tenía por objetivo analizar el perfil de las mujeres que rechazan esta técnica analgésica. Resultados: Las principales características que definen a las mujeres que rechazan la analgesia epidural durante el parto vienen dadas por su nivel educativo, nivel de ingresos y situación laboral. Conclusiones: Las características sociales, económicas y culturales que definen el rechazo, es decir, el "tipo" de mujer que rehúsa la epidural, coinciden con el esquema de "mujer tradicional" estudiado por otros autores (que se caracteriza por tener escasos

  12. Statistical Significance of the Contribution of Variables to the PCA Solution: An Alternative Permutation Strategy

    Science.gov (United States)

    Linting, Marielle; van Os, Bart Jan; Meulman, Jacqueline J.

    2011-01-01

    In this paper, the statistical significance of the contribution of variables to the principal components in principal components analysis (PCA) is assessed nonparametrically by the use of permutation tests. We compare a new strategy to a strategy used in previous research consisting of permuting the columns (variables) of a data matrix…

  13. PCA3 IS A TRUE ONCOMARKER OF PROSTATE CANCER: A REVIEW OF LITERATURE

    Directory of Open Access Journals (Sweden)

    A. V. Sidorenkov

    2014-07-01

    Full Text Available Routine measurement of prostate-specific antigen (PSA levels has resulted in the increased number of prostate biopsies. The lower age-related reference values of PSA have in its turn led to the larger number of unnecessary prostate biopsies (to the hyperdiagnosis of clinically insignificant PC. Biopsy can presently identify prostate cancer (PC in only 35 % of the patients with total PSA level of 4–10 ng/ml and PSA-negative PC in 20–25 %. The diagnostic potentialities of PSA as an independent marker have been obviously exhausted. The new PC oncomarkers described in the latest literature are certain to deserve meticulous attention and investigation. From a variety of oncomarkers, PCA3 is most promising biomarker. PCA3 versus total PSA or its other derivatives is the best predictor of PC during primary or repeated prostate biopsy. Some publications show that PCA3 may be used to schedule primary or repeated prostate biopsy, by constructing risk nomograms, in conjunction with other individu-al indicators of a patient’s examination, including those with other newest biomarkers for PC. The use of PCA3 in everyday practice may assist in increasing the specificity of PC diagnosis and in reducing the number of unnecessary prostate biopsies. 

  14. External Validation of Urinary PCA3-Based Nomograms to Individually Predict Prostate Biopsy Outcome

    NARCIS (Netherlands)

    M. Auprich; A. Haese; J. Walz; K. Pummer; A. de la Taille; M. Graefen; T. de Reijke; M. Fisch; P. Kil; P. Gontero; J. Irani; F.K.H. Chun

    2010-01-01

    Background: Prior to safely adopting risk stratification tools, their performance must be tested in an external patient cohort. Objective: To assess accuracy and generalizability of previously reported, internally validated, prebiopsy prostate cancer antigen 3 (PCA3) gene-based nomograms when applie

  15. PCA3 IS A TRUE ONCOMARKER OF PROSTATE CANCER: A REVIEW OF LITERATURE

    Directory of Open Access Journals (Sweden)

    A. V. Sidorenkov

    2014-01-01

    Full Text Available Routine measurement of prostate-specific antigen (PSA levels has resulted in the increased number of prostate biopsies. The lower age-related reference values of PSA have in its turn led to the larger number of unnecessary prostate biopsies (to the hyperdiagnosis of clinically insignificant PC. Biopsy can presently identify prostate cancer (PC in only 35 % of the patients with total PSA level of 4–10 ng/ml and PSA-negative PC in 20–25 %. The diagnostic potentialities of PSA as an independent marker have been obviously exhausted. The new PC oncomarkers described in the latest literature are certain to deserve meticulous attention and investigation. From a variety of oncomarkers, PCA3 is most promising biomarker. PCA3 versus total PSA or its other derivatives is the best predictor of PC during primary or repeated prostate biopsy. Some publications show that PCA3 may be used to schedule primary or repeated prostate biopsy, by constructing risk nomograms, in conjunction with other individu-al indicators of a patient’s examination, including those with other newest biomarkers for PC. The use of PCA3 in everyday practice may assist in increasing the specificity of PC diagnosis and in reducing the number of unnecessary prostate biopsies. 

  16. Applications of PCA and SVM-PSO Based Real-Time Face Recognition System

    Directory of Open Access Journals (Sweden)

    Ming-Yuan Shieh

    2014-01-01

    Full Text Available This paper incorporates principal component analysis (PCA with support vector machine-particle swarm optimization (SVM-PSO for developing real-time face recognition systems. The integrated scheme aims to adopt the SVM-PSO method to improve the validity of PCA based image recognition systems on dynamically visual perception. The face recognition for most human-robot interaction applications is accomplished by PCA based method because of its dimensionality reduction. However, PCA based systems are only suitable for processing the faces with the same face expressions and/or under the same view directions. Since the facial feature selection process can be considered as a problem of global combinatorial optimization in machine learning, the SVM-PSO is usually used as an optimal classifier of the system. In this paper, the PSO is used to implement a feature selection, and the SVMs serve as fitness functions of the PSO for classification problems. Experimental results demonstrate that the proposed method simplifies features effectively and obtains higher classification accuracy.

  17. Extended Two-Dimensional PCA for Efficient Face Representation and Recognition

    CERN Document Server

    Safayani, Mehran; Khademi, Mahmoud

    2010-01-01

    In this paper a novel method called Extended Two-Dimensional PCA (E2DPCA) is proposed which is an extension to the original 2DPCA. We state that the covariance matrix of 2DPCA is equivalent to the average of the main diagonal of the covariance matrix of PCA. This implies that 2DPCA eliminates some covariance information that can be useful for recognition. E2DPCA instead of just using the main diagonal considers a radius of r diagonals around it and expands the averaging so as to include the covariance information within those diagonals. The parameter r unifies PCA and 2DPCA. r = 1 produces the covariance of 2DPCA, r = n that of PCA. Hence, by controlling r it is possible to control the trade-offs between recognition accuracy and energy compression (fewer coefficients), and between training and recognition complexity. Experiments on ORL face database show improvement in both recognition accuracy and recognition time over the original 2DPCA.

  18. Elemental concentration analysis in PCa, BPH and normal prostate tissues using SR-TXRF

    International Nuclear Information System (INIS)

    Prostate cancer (PCa) is one of the main causes of illness and death all over the world. In Brazil, prostate cancer currently represents the second most prevalent malignant neoplasia in men, representing 21% of all cancer cases. Benign Prostate Hyperplasia (BPH) is an illness prevailing in men above the age of 50, close to 90% after the age of 80. The prostate presents a high zinc concentration, about 10-fold higher than any other body tissue. In this work, samples of human prostate tissues with cancer (PCa), BPH and normal tissue were analyzed utilizing the total reflection X-ray fluorescence spectroscopy using synchrotron radiation technique (SRTXRF) to investigate the differences in the elemental concentrations in these tissues. SR-TXRF analyses were performed at the X-Ray fluorescence beamline at Brazilian National Synchrotron Light Laboratory (LNLS), in Campinas, Sao Paulo. It was possible to determine the concentrations of the following elements: P, S, K, Ca, Fe, Cu, Zn, Br and Rb. By using Mann-Whitney U test it was observed that almost all elements presented concentrations with significant differences α = 0.05) between the groups studied. The elements and groups were: S, K, Ca, Fe, Zn, Br and Rb (PCa X Normal); S, Fe, Zn and Br (PCa X BPH); K, Ca, Fe, Zn, Br and Rb (BPH X Normal). (author)

  19. Global Clustering Quality Coefficient Assessing the Efficiency of PCA Class Assignment

    Directory of Open Access Journals (Sweden)

    Mirela Praisler

    2014-01-01

    Full Text Available An essential factor influencing the efficiency of the predictive models built with principal component analysis (PCA is the quality of the data clustering revealed by the score plots. The sensitivity and selectivity of the class assignment are strongly influenced by the relative position of the clusters and by their dispersion. We are proposing a set of indicators inspired from analytical geometry that may be used for an objective quantitative assessment of the data clustering quality as well as a global clustering quality coefficient (GCQC that is a measure of the overall predictive power of the PCA models. The use of these indicators for evaluating the efficiency of the PCA class assignment is illustrated by a comparative study performed for the identification of the preprocessing function that is generating the most efficient PCA system screening for amphetamines based on their GC-FTIR spectra. The GCQC ranking of the tested feature weights is explained based on estimated density distributions and validated by using quadratic discriminant analysis (QDA.

  20. 基于PCA和LDA的方言辨识%Dialect Identification Based on PCA and LDA

    Institute of Scientific and Technical Information of China (English)

    何艳; 于凤芹

    2012-01-01

    针对PCA没有有效利用样本的类别信息而导致方言识别率低的问题,采用PCA和LDA组合方法进行特征提取.首先用PCA对普通话、上海话、广东话和闽南话四种方言进行降维,然后在降维后的空间中用LDA进一步特征提取,最后将该特征向量送入BP神经网络进行辨识.仿真实验结果表明,基于PCA和LDA的方言识别的平均识别率高达85%.%In order to solve the low dialect identification rate because PCA doesn't effectively use the sample classification information, a method of feature extraction using PCA and LDA is employed. In this paper, PCA is used to effectively reduce the dimensions of Mandarin, Shanghainese, Cantonese, Minnanese, and then LDA is adopted to extract feature vectors from the dimension-reduced space as the input vectors with BP neural network to recognize. The Simulation results demonstrate that the average dialect identification rate based on PCA and LDA can be up to 85%.

  1. Estimating stellar fundamental parameters using PCA: application to early type stars of GES data

    CERN Document Server

    Farah, W; Paletou, F; Blomme, R

    2015-01-01

    This work addresses a procedure to estimate fundamental stellar parameters such as T eff , logg, [Fe/H], and v sin i using a dimensionality reduction technique called Principal Component Analysis (PCA), applied to a large database of synthetic spectra. This technique shows promising results for inverting stellar parameters of observed targets from Gaia ESO Survey.

  2. Analgesia preemptiva com S(+cetamina e bupivacaína peridural em histerectomia abdominal Analgesia preemptiva con S(+cetamina y bupivacaína peridural en histerectomía abdominal Preemptive analgesia with epidural bupivacaine and S(+ketamine in abdominal hysterectomy

    Directory of Open Access Journals (Sweden)

    Ferdinand Edson de Castro

    2005-02-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: O presente estudo investiga a capacidade de o antagonista do receptor NMDA, S(+cetamina, associado à injeção peridural de anestésico local (bupivacaína, previamente administrado à incisão promover analgesia preemptiva em pacientes submetidas a histerectomia total abdominal. MÉTODO: Foram avaliadas 30 pacientes, distribuídas aleatoriamente em dois grupos de igual tamanho e estudadas prospectivamente de forma encoberta. Injeção peridural e inserção de cateter foram realizadas entre os interespaços de L1-L2. No grupo I (G1, n = 15, as pacientes receberam, por via peridural, 17 mL de bupivacaína a 0,25%, sem vasoconstritor, associados a 30 mg de S(+cetamina (3 mL, trinta minutos antes da incisão cirúrgica; após 30 minutos da incisão, receberam 20 mL de solução fisiológica a 0,9%. No grupo 2 (G2, n = 15, receberam 20 mL de solução fisiológica, por via peridural, 30 minutos antes da incisão, sendo feita administração de 17 mL de bupivacaína a 0,25% associados a 30 mg de S(+cetamina (3 mL, trinta minutos depois da incisão. Após a injeção peridural, realizou-se anestesia geral com propofol, pancurônio, O2 e isoflurano. Para analgesia pós-operatória foi usada solução peridural em bolus de fentanil associada à bupivacaína, em intervalo mínimo de quatro horas e suplementação com dipirona, se necessária. Avaliou-se a intensidade da dor através de escala numérica e verbal (ao despertar, 6, 12, 18 e 24 horas após o término da operação, o tempo necessário para solicitar pela primeira vez o analgésico e o consumo total de analgésicos. RESULTADOS: Não houve diferença significativa entre os grupos em relação ao tempo para solicitar analgésicos pela primeira vez, ao consumo de analgésicos e aos escores de dor pelas escalas numérica e verbal. CONCLUSÕES: Não foi possível demonstrar efeito preemptivo com a utilização peridural de S(+cetamina e bupivacaína nas doses

  3. [Maternal behavior toward her newborn infant. Potential modification by peridural analgesia or childbirth preparation].

    Science.gov (United States)

    Wagner, A; Grenom, A; Pierre, F; Soutoul, J H; Fabre-Nys, C; Krebhiel, D

    1989-01-01

    The effects of sophrology and epidural analgesia on early relationship between the mother and her child were studied on a simple of 190 deliveries. The mothers were observed during and just after delivery. Mothers who had been separated from their child before the end of the observation were excluded from the study. The patients had the choice between epidural analgesia or prenatal care with sophrology. Participation to prenatal courses has statistically a positive effect on the relation between the mother and her child (p less than 0.01). Instead, epidural analgesia and posture have very limited effect on this factor. However, a trend to more interaction is found in multipari and patients who didn't choose epidural analgesia. PMID:2928660

  4. Dexamethasone prolongs local analgesia after subcutaneous infiltration of bupivacaine microcapsules in human volunteers

    DEFF Research Database (Denmark)

    Holte, Kathrine; Werner, Mads U; Lacouture, Peter G;

    2002-01-01

    BACKGROUND: The addition of small amounts of dexamethasone to extended-release formulations of bupivacaine in microcapsules has been found to prolong local analgesia in experimental studies, but no clinical data are available. METHODS: In a double-blinded study, 12 healthy male volunteers were...... randomized to receive simultaneous subcutaneous injections of bupivacaine microcapsules with dexamethasone and bupivacaine microcapsules without dexamethasone in each calf. Local analgesia was assessed with a validated human pain model; main parameters evaluated were thermal, mechanical, and pain detection...... curve [AUC]) were considered best estimate of analgesia. Safety evaluations were performed daily for the first weekand at 2 weeks, 6 weeks, and 6 months after injection. RESULTS: The addition of dexamethasone significantly prolonged local analgesia of bupivacaine microcapsules without influence on...

  5. Dexamethasone prolongs local analgesia after subcutaneous infiltration of bupivacaine microcapsules in human volunteers

    DEFF Research Database (Denmark)

    Holte, Kathrine; Werner, Mads U; Lacouture, Peter G;

    2002-01-01

    BACKGROUND: The addition of small amounts of dexamethasone to extended-release formulations of bupivacaine in microcapsules has been found to prolong local analgesia in experimental studies, but no clinical data are available. METHODS: In a double-blinded study, 12 healthy male volunteers were...... randomized to receive simultaneous subcutaneous injections of bupivacaine microcapsules with dexamethasone and bupivacaine microcapsules without dexamethasone in each calf. Local analgesia was assessed with a validated human pain model; main parameters evaluated were thermal, mechanical, and pain detection...... curve [AUC]) were considered best estimate of analgesia. Safety evaluations were performed daily for the first week and at 2 weeks, 6 weeks, and 6 months after injection. RESULTS: The addition of dexamethasone significantly prolonged local analgesia of bupivacaine microcapsules without influence on...

  6. 3D Face Recognition based on Radon Transform, PCA, LDA using KNN and SVM

    Directory of Open Access Journals (Sweden)

    P. S. Hiremath

    2014-06-01

    Full Text Available Biometrics (or biometric authentication refers to the identification of humans by their characteristics or traits. Bio-metrics is used in computer science as a form of identification and access control. It is also used to identify individuals in groups that are under surveillance. Biometric identifiers are the distinctive, measurable characteristics used to label and describe individuals. Three dimensional (3D human face recognition is emerging as a significant biometric technology. Research interest into 3D face recognition has increased during recent years due to the availability of improved 3D acquisition devices and processing algorithms. Three dimensional face recognition also helps to resolve some of the issues associated with two dimensional (2D face recognition. In the previous research works, there are several methods for face recognition using range images that are limited to the data acquisition and pre-processing stage only. In the present paper, we have proposed a 3D face recognition algorithm which is based on Radon transform, Principal Component Analysis (PCA and Linear Discriminant Analysis (LDA. The Radon transform (RT is a fundamental tool to normalize 3D range data. The PCA is used to reduce the dimensionality of feature space, and the LDA is used to optimize the features, which are finally used to recognize the faces. The experimentation has been done using three publicly available databases, namely, Bhosphorus, Texas and CASIA 3D face databases. The experimental results are shown that the proposed algorithm is efficient in terms of accuracy and detection time, in comparison with other methods based on PCA only and RT+PCA. It is observed that 40 Eigen faces of PCA and 5 LDA components lead to an average recognition rate of 99.20% using SVM classifier.

  7. Analgesia in hip fractures. Do fascia-iliac blocks make any difference?

    OpenAIRE

    Callear, Jacqueline; Shah, Ku

    2016-01-01

    Despite recent national advances in the care for the hip fracture patient, significant morbidity and mortality persists. Some of this morbidity is attributable to the analgesia provided in the hospital setting. The National Institute of Health and Care Excellence and the Association of Anaesthetists of Great Britain and Ireland recommend the use of simple oral analgesia including opioids, with fascia-iliac blocks (FIB) used as an adjunct. Literature review reveals a paucity of evidence on thi...

  8. PHYSICAL ANALGESIA OR THE POTENTIAL OF PHYSICAL MODALITIES TO REDUCE PAIN

    OpenAIRE

    KOLEVA IVET BORISSOVA; YOSHINOV BORISLAV RADOSLAVOV

    2015-01-01

    The Declaration of Montréal of the International Pain Summit of the International Association for the Study of Pain (IASP) recognizes the deficits in knowledge of health care professionals regarding the mechanisms and management of pain. Therefore we try to formulate our own theory for physical analgesia or analgesia based on physical modalities, traditionally applied in physical medicine and rehabilitation.During our modest clinical experience (of 20 years) and clinical observations and inve...

  9. Advances in patient-controlled analgesia: the role of fentanyl ITS

    OpenAIRE

    Ian Power; Jon G McCormack

    2009-01-01

    Ian Power, Jon G McCormackDepartment of Anaesthesia, Critical Care and Pain Medicine, The University of Edinburgh, Royal Infirmary, Edinburgh, UKAbstract: Effective pain relief is an essential component of a patient’s peri-operative care package. Good analgesia has been shown to reduce the incidence of cardiovascular, respiratory and thrombo-embolic complications following surgery. Satisfactory analgesia facilitates early patient ambulation following surgery, which may reduce in-pat...

  10. Mediation of buprenorphine analgesia by a combination of traditional and truncated mu opioid receptor splice variants.

    Science.gov (United States)

    Grinnell, Steven G; Ansonoff, Michael; Marrone, Gina F; Lu, Zhigang; Narayan, Ankita; Xu, Jin; Rossi, Grace; Majumdar, Susruta; Pan, Ying-Xian; Bassoni, Daniel L; Pintar, John; Pasternak, Gavril W

    2016-10-01

    Buprenorphine has long been classified as a mu analgesic, although its high affinity for other opioid receptor classes and the orphanin FQ/nociceptin ORL1 receptor may contribute to its other actions. The current studies confirmed a mu mechanism for buprenorphine analgesia, implicating several subsets of mu receptor splice variants. Buprenorphine analgesia depended on the expression of both exon 1-associated traditional full length 7 transmembrane (7TM) and exon 11-associated truncated 6 transmembrane (6TM) MOR-1 variants. In genetic models, disruption of delta, kappa1 or ORL1 receptors had no impact on buprenorphine analgesia, while loss of the traditional 7TM MOR-1 variants in an exon 1 knockout (KO) mouse markedly lowered buprenorphine analgesia. Loss of the truncated 6TM variants in an exon 11 KO mouse totally eliminated buprenorphine analgesia. In distinction to analgesia, the inhibition of gastrointestinal transit and stimulation of locomotor activity were independent of truncated 6TM variants. Restoring expression of a 6TM variant with a lentivirus rescued buprenorphine analgesia in an exon 11 KO mouse that still expressed the 7TM variants. Despite a potent and robust stimulation of (35) S-GTPγS binding in MOR-1 expressing CHO cells, buprenorphine failed to recruit β-arrestin-2 binding at doses as high as 10 µM. Buprenorphine was an antagonist in DOR-1 expressing cells and an inverse agonist in KOR-1 cells. Buprenorphine analgesia is complex and requires multiple mu receptor splice variant classes but other actions may involve alternative receptors. PMID:27223691

  11. Permanent lesion in rostral ventromedial medulla potentiates swim stress-induced analgesia in formalin test

    OpenAIRE

    Ali Shamsizadeh; Neda Soliemani; Mohammad Mohammad-Zadeh; Hassan Azhdari-

    2014-01-01

    Objective(s): There are many reports about the role of rostral ventromedial medulla (RVM) in modulating stress-induced analgesia (SIA). In the previous study we demonstrated that temporal inactivation of RVM by lidocaine potentiated stress-induced analgesia. In this study, we investigated the effect of permanent lesion of the RVM on SIA by using formalin test as a model of acute inflammatory pain. Materials and Methods: Three sets of experiments were conducted: (1) Application of stress proto...

  12. TRPM8 is the principal mediator of menthol-induced analgesia of acute and inflammatory pain.

    Science.gov (United States)

    Liu, Boyi; Fan, Lu; Balakrishna, Shrilatha; Sui, Aiwei; Morris, John B; Jordt, Sven-Eric

    2013-10-01

    Menthol, the cooling natural product of peppermint, is widely used in medicinal preparations for the relief of acute and inflammatory pain in sports injuries, arthritis, and other painful conditions. Menthol induces the sensation of cooling by activating TRPM8, an ion channel in cold-sensitive peripheral sensory neurons. Recent studies identified additional targets of menthol, including the irritant receptor, TRPA1, voltage-gated ion channels and neurotransmitter receptors. It remains unclear which of these targets contribute to menthol-induced analgesia, or to the irritating side effects associated with menthol therapy. Here, we use genetic and pharmacological approaches in mice to probe the role of TRPM8 in analgesia induced by L-menthol, the predominant analgesic menthol isomer in medicinal preparations. L-menthol effectively diminished pain behavior elicited by chemical stimuli (capsaicin, acrolein, acetic acid), noxious heat, and inflammation (complete Freund's adjuvant). Genetic deletion of TRPM8 completely abolished analgesia by L-menthol in all these models, although other analgesics (acetaminophen) remained effective. Loss of L-menthol-induced analgesia was recapitulated in mice treated with a selective TRPM8 inhibitor, AMG2850. Selective activation of TRPM8 with WS-12, a menthol derivative that we characterized as a specific TRPM8 agonist in cultured sensory neurons and in vivo, also induced TRPM8-dependent analgesia of acute and inflammatory pain. L-menthol- and WS-12-induced analgesia was blocked by naloxone, suggesting activation of endogenous opioid-dependent analgesic pathways. Our data show that TRPM8 is the principal mediator of menthol-induced analgesia of acute and inflammatory pain. In contrast to menthol, selective TRPM8 agonists may produce analgesia more effectively, with diminished side effects. PMID:23820004

  13. Analgesic effect of preoperative versus intraoperative dexamethasone after laparoscopic cholecystectomy with multimodal analgesia

    OpenAIRE

    Lim, Se Hun; Jang, Eun Ho; KIM, Myoung-Hun; Cho, Kwangrae; Lee, Jeong Han; Lee, Kun Moo; Cheong, Soon Ho; Kim, Young-Jae; Shin, Chee-Mahn

    2011-01-01

    Background Pain after laparoscopy is multifactorial and different treatments have been proposed to provide pain relief. Multimodal analgesia is now recommended to prevent and treat post-laparoscopy pain. Dexamethasone is effective in reducing postoperative pain. The timing of steroid administration seems to be important. We evaluated the analgesic efficacy of preoperative intravenous dexamethasone 1 hour before versus during laparoscopic cholecystectomy with multimodal analgesia. Methods One ...

  14. Understanding Central Mechanisms of Acupuncture Analgesia Using Dynamic Quantitative Sensory Testing: A Review

    OpenAIRE

    Jiang-Ti Kong; Schnyer, Rosa N; Johnson, Kevin A.; Sean Mackey

    2013-01-01

    We discuss the emerging translational tools for the study of acupuncture analgesia with a focus on psychophysical methods. The gap between animal mechanistic studies and human clinical trials of acupuncture analgesia calls for effective translational tools that bridge neurophysiological data with meaningful clinical outcomes. Temporal summation (TS) and conditioned pain modulation (CPM) are two promising tools yet to be widely utilized. These psychophysical measures capture the state of the a...

  15. Comparison of parenteral tramadol and epidural ropivacaine for labour analgesia: a prospective clinical study

    Directory of Open Access Journals (Sweden)

    Akanksha Lamba

    2016-06-01

    Conclusions: Maternal outcome in labour analgesia is similar with 100 mg I/M tramadol and epidural ropivacaine. There is no significant difference between duration of labour, rate of LSCS, incidence of instrumental delivery and neonatal outcome in the two modes of analgesia. Analgesic efficacy with epidural ropivacaine seems to be better compared to intramuscular tramadol. [Int J Reprod Contracept Obstet Gynecol 2016; 5(6.000: 1722-1727

  16. Comparison of parenteral tramadol and epidural ropivacaine for labour analgesia: a prospective clinical study

    OpenAIRE

    Akanksha Lamba; Priya Sardana; Ramanjeet Kaur

    2016-01-01

    Background: The pain of childbirth is one of the most severe types of pain that a woman experiences in her lifetime. Adequate analgesia during labour has a positive influence on the course of labour. For labor analgesia several non-pharmacologic and pharmacologic methods are adopted. The objective of the study is to compare parenteral tramadol and epidural ropivacaine with regard to maternal and labour outcome. Methods: This prospective, comparative, interventional clinical study was condu...

  17. Effectiveness of femoral nerve block for postoperative analgesia after total knee arthroplasty: a Meta analysis%股神经阻滞用于全膝关节置换术患者术后镇痛的Meta分析

    Institute of Scientific and Technical Information of China (English)

    黄天丰; 张扬; 方向志; 王存金; 高巨

    2016-01-01

    目的 采用Meta分析的方法评价股神经阻滞(femoral nerve block,FNB)对全膝关节置换术(total knee arthroplasty,TKA)患者术后镇痛的效果. 方法 检索PubMed、OVID、EMBASE、Cochrane图书馆,检索时间从建库至2014年11月.收集在TKA术后使用FNB与患者自控静脉镇痛(patient-controlled intravenous analgesia,PCIA)或患者自控硬膜外镇痛(patient-controlled epidural analgesia,PCEA)的临床随机对照实验(randomized controlled trial,RCT).采用Cochrane协作网系统评价法评价纳入文献的质量,采用RevMan5.2软件进行Meta分析评价. 结果 共纳入14项研究,包括1 157例患者,其中FNB组616例,PCIA组380例,PCEA组161例.与PCIA组比较,FNB有效减少了患者术后24 h[加权均数差(weighted mean difference,WMD)=-17.93,95%置信区间(confidence interval,CI)=-27.38~-8.49]及48 h(WMD=-25.70,95%CI:-41.67~-9.74)的吗啡累计消耗量,降低患者术后24 h活动时VAS(WMD=-1.99,95%CI:-3.14~-0.85)(P<0.05);且FNB组患者术后恶心呕吐比值比(odds ratio,OR)(0.31,95%CI:0.22~0.44)、尿潴留(OR=0.24,95%CI:0.13~0.43,P<0.05)及头晕的发生率(OR=0.27,95%CI:0.14~0.52)都较低(P<0.05). 结论 比较PCIA及PCEA,FNB可能是TKA患者术后镇痛的一种更好的选择.%Objective To define the efficacy of femoral nerve block (FNB) with epidural and patient-controlled analgesia (PCA) for postoperative analgesia after total knee arthroplasty.Methods We searched the PubMed,OVID,EMBASE,and Cochrane library for all randomized controlled trials (RCTs) on the efficacy of FNB versus epidural or PCA in patients after total knee arthroplasty.The quality of the studies was evaluated by the method recommended by Cochrane Collaboration.Meta-analysis was conducted using the Cochrane Collaboration's RevMan 5.2 software.Results Fourteen RCTs with a total of 1 157 patients were included into the final analysis,616 patients received femoral nerve block,380 patients received PCA and

  18. Bilateral interpleural versus lumbar epidural bupivacaine-morphine analgesia for upper abdominal surgery.

    Science.gov (United States)

    Demian, Atef D; Wahba, Ashraf M; Atia, Emad M; Hussein, Sami H

    2003-10-01

    This randomized study was designed to compare the effectiveness of bilateral interpleural analgesia with lumbar epidural analgesia, on postoperative pain relief in upper abdominal surgery. The studied patients were randomely allocated into either interpleural group "IP" (n = 15) or epidural group "EP" (n = 15). In "IP" group, preanesthetic bilateral interpleural block was done using a mixture of bupivacaine 0.5% (0.8 mg/kg) and 2 mg morphine diluted to 50 ml saline for each side. In "EP" group, the same mixture-diluted in 20 ml saline-was injected in the epidural space (L2-3). The general anesthetic technique was the same in both groups. Hemodynamic, gasometric, verbal pain score (VPS) values and complications were compared in both techniques. Heart rate (HR) and mean arterial pressure (MAP) readings were in the accepted normal range in the perioperative period although significant lower readings were detected in "EP" group. No significant differences were displayed in blood gasometric variables between the two groups. There were considerable level of analgesia in both groups in the postoperative period although "EP" analgesia was superior to "IP". More pain free patients (9 versus 4) and significant lower consumption of nalbuphine were detected in "EP" group. The results of this study indicate that bilateral "IP" analgesia may offer a satisfactory analgesia for upper abdominal surgery when the use of other analgesic techniques may be contraindicated. PMID:14740589

  19. Análisis de la no elección de la analgesia epidural durante el trabajo de parto en las mujeres andaluzas: "la buena sufridora" Analysis of rejection of epidural analgesia during labor in Andalusian women: "the silent sufferer"

    Directory of Open Access Journals (Sweden)

    L. Biedma Velázquez

    2010-02-01

    Full Text Available Introducción: La analgesia epidural se ha popularizado en España, tanto en su conocimiento como en su uso, a lo largo de los últimos 20 años. La elección de esta técnica analgésica por parte de la futura madre durante el trabajo de parto y el parto en Andalucía es un derecho de la mujer que, explícitamente, sólo estará limitado por sus condiciones físicas y de salud y por los recursos disponibles en el hospital en el momento del parto. Esta elección pone en relación 2 elementos: por un lado, el componente cognitivo que establece la conveniencia o no de utilizar esta técnica según los valores, percepciones, cultura, etc. de la mujer y, por otro, el componente conductual, es decir, el uso o no de la técnica en cuestión, que dependerá además de la elección de la mujer de las condiciones anteriormente mencionadas. Objetivo: Analizar qué características definen a las mujeres que, aun pudiendo, deciden no utilizar analgesia epidural durante el parto en Andalucía. Material y métodos: Para ello se ha utilizado la información proporcionada por las mujeres ingresadas por parto en los hospitales del Sistema Sanitario Público de Andalucía, contenida en las encuestas anuales de satisfacción de usuarios del sistema de atención hospitalario en esta comunidad autónoma entre los años 2000 y 2007. Con esta información se ha realizado un análisis de segmentación jerárquica que tenía por objetivo analizar el perfil de las mujeres que rechazan esta técnica analgésica. Resultados: Las principales características que definen a las mujeres que rechazan la analgesia epidural durante el parto vienen dadas por su nivel educativo, nivel de ingresos y situación laboral. Conclusiones: Las características sociales, económicas y culturales que definen el rechazo, es decir, el "tipo" de mujer que rehúsa la epidural, coinciden con el esquema de "mujer tradicional" estudiado por otros autores (que se caracteriza por tener escasos

  20. Intoxicación suicida por paracetamol Suicidal poisoning with paracetamol

    OpenAIRE

    J. Blanco Pampín; N. Morte Tamayo

    2002-01-01

    La intoxicación por paracetamol es un hecho verdaderamente infrecuente, debido sobre todo al elevado rango terapéutico que posee. Los efectos letales de su ingestión a menudo son el resultado de las complicaciones que originan, aunque por efecto directo del fármaco (intoxicación aguda) se producen tanto en suicidios como a causa de sobredosis en búsqueda de analgesia (intoxicación medicamentosa accidental). El presente artículo expone el caso de una mujer joven con antecedentes psiquiátricos,...

  1. Analgesia en el paciente con abdomen agudo: ¿persiste el peligro? Analgesia in patients with acute abdomen: does danger persist?

    OpenAIRE

    Juan Camilo Correa Gallego; Edward Alexander Blandón Castaño

    2006-01-01

    INTRODUCCIÓN: el dolor abdominal es un motivo de consulta frecuente. Dado que se presenta como el síntoma principal en diversas enfermedades y que existe la posibilidad de que se generen complicaciones si el diagnóstico no se establece oportunamente, ha habido renuencia a brindar analgesia en forma temprana en estos casos. Los cambios en el ejercicio médico actual permiten preguntarse si está aún justificada la conducta de mantener a estos pacientes sin analgesia. MATERIALES Y MÉTODOS: se rea...

  2. Using a cross-model loadings plot to identify protein spots causing 2-DE gels to become outliers in PCA

    DEFF Research Database (Denmark)

    Kristiansen, Luise Cederkvist; Jacobsen, Susanne; Jessen, Flemming;

    2010-01-01

    The multivariate method PCA is an exploratory tool often used to get an overview of multivariate data, such as the quantified spot volumes of digitized 2-DE gels. PCA can reveal hidden structures present in the data, and thus enables identification of potential outliers and clustering. Based on P...

  3. Prioritization of watershed through morphometric parameters: a PCA-based approach

    Science.gov (United States)

    Meshram, Sarita Gajbhiye; Sharma, S. K.

    2015-09-01

    Remote sensing (RS) and Geographic Information Systems (GIS) techniques have become very important these days as they aid planners and decision makers to make effective and correct decisions and designs. Principal Component Analysis (PCA) involves a mathematical procedure that transforms a number of (possibly) correlated variables into a (smaller) number of uncorrelated variables. It reduces the dimensionality of the data set and identifies a new meaningful underlying variable. Morphometric analysis and prioritization of the sub-watersheds of Shakkar River Catchment, Narsinghpur district in Madhya Pradesh State, India, is carried out using RS and GIS techniques as discussed in Gajbhiye et al. (Appl Water Sci 4(1):51-61, 2013b). In this study we apply PCA technique in Shakkar River Catchment for redundancy of morphometric parameters and find the more effective parameters for prioritization of the watershed and discuss the comparison between Gajbhiye et al. (Appl Water Sci 4(1):51-61, 2013b) and the present prioritization scheme.

  4. Nonlinear time series analysis of vibration data from a friction brake: SSA, PCA, and MFDFA

    International Nuclear Information System (INIS)

    We use the methodology of singular spectrum analysis (SSA), principal component analysis (PCA), and multi-fractal detrended fluctuation analysis (MFDFA), for investigating characteristics of vibration time series data from a friction brake. SSA and PCA are used to study the long time-scale characteristics of the time series. MFDFA is applied for investigating all time scales up to the smallest recorded one. It turns out that the majority of the long time-scale dynamics, that is presumably dominated by the structural dynamics of the brake system, is dominated by very few active dimensions only and can well be understood in terms of low dimensional chaotic attractors. The multi-fractal analysis shows that the fast dynamical processes originating in the friction interface are in turn truly multi-scale in nature

  5. Application of principal component analysis (PCA) as a sensory assessment tool for fermented food products.

    Science.gov (United States)

    Ghosh, Debasree; Chattopadhyay, Parimal

    2012-06-01

    The objective of the work was to use the method of quantitative descriptive analysis (QDA) to describe the sensory attributes of the fermented food products prepared with the incorporation of lactic cultures. Panellists were selected and trained to evaluate various attributes specially color and appearance, body texture, flavor, overall acceptability and acidity of the fermented food products like cow milk curd and soymilk curd, idli, sauerkraut and probiotic ice cream. Principal component analysis (PCA) identified the six significant principal components that accounted for more than 90% of the variance in the sensory attribute data. Overall product quality was modelled as a function of principal components using multiple least squares regression (R (2) = 0.8). The result from PCA was statistically analyzed by analysis of variance (ANOVA). These findings demonstrate the utility of quantitative descriptive analysis for identifying and measuring the fermented food product attributes that are important for consumer acceptability. PMID:23729852

  6. An Effective Method of Monitoring the Large-Scale Traffic Pattern Based on RMT and PCA

    Directory of Open Access Journals (Sweden)

    Jia Liu

    2010-01-01

    Full Text Available Mechanisms to extract the characteristics of network traffic play a significant role in traffic monitoring, offering helpful information for network management and control. In this paper, a method based on Random Matrix Theory (RMT and Principal Components Analysis (PCA is proposed for monitoring and analyzing large-scale traffic patterns in the Internet. Besides the analysis of the largest eigenvalue in RMT, useful information is also extracted from small eigenvalues by a method based on PCA. And then an appropriate approach is put forward to select some observation points on the base of the eigen analysis. Finally, some experiments about peer-to-peer traffic pattern recognition and backbone aggregate flow estimation are constructed. The simulation results show that using about 10% of nodes as observation points, our method can monitor and extract key information about Internet traffic patterns.

  7. A Fault Diagnosis Method for Rotating Machinery Based on PCA and Morlet Kernel SVM

    Directory of Open Access Journals (Sweden)

    Shaojiang Dong

    2014-01-01

    Full Text Available A novel method to solve the rotating machinery fault diagnosis problem is proposed, which is based on principal components analysis (PCA to extract the characteristic features and the Morlet kernel support vector machine (MSVM to achieve the fault classification. Firstly, the gathered vibration signals were decomposed by the empirical mode decomposition (EMD to obtain the corresponding intrinsic mode function (IMF. The EMD energy entropy that includes dominant fault information is defined as the characteristic features. However, the extracted features remained high-dimensional, and excessive redundant information still existed. So, the PCA is introduced to extract the characteristic features and reduce the dimension. The characteristic features are input into the MSVM to train and construct the running state identification model; the rotating machinery running state identification is realized. The running states of a bearing normal inner race and several inner races with different degree of fault were recognized; the results validate the effectiveness of the proposed algorithm.

  8. Image Fusion of CT/MRI using DWT , PCA Methods and Analog DSP Processor

    Directory of Open Access Journals (Sweden)

    Sonali Mane

    2014-02-01

    Full Text Available Medical image fusion is a technique in which useful information from two or more recorded medical images is integrated into a new image to offer as much details as possible for diagnosis. The fusion of different modality images are Computer Tomography (CT and Magnetic Resonance Imaging (MRI by integrating the DWT & PCA methods. The decomposed coefficients of Discrete Wavelet Transformation (DWT are applied with the Principal Component Analysis (PCA to get fused image information. Choose decomposed coefficients by fusion rule and using inverse DWT to get the fussed image of two modalities CT and MRI. The RMSE and PSNR analysis shows better improvement on results. For the proposed fusion enhancement technique going to implement on the processor based kit or will show the hardware support.

  9. Quantitative detection of defects based on Markov-PCA-BP algorithm using pulsed infrared thermography technology

    Science.gov (United States)

    Tang, Qingju; Dai, Jingmin; Liu, Junyan; Liu, Chunsheng; Liu, Yuanlin; Ren, Chunping

    2016-07-01

    Quantitative detection of debonding defects' diameter and depth in TBCs has been carried out using pulsed infrared thermography technology. By combining principal component analysis with neural network theory, the Markov-PCA-BP algorithm was proposed. The principle and realization process of the proposed algorithm was described. In the prediction model, the principal components which can reflect most characteristics of the thermal wave signal were set as the input, and the defect depth and diameter was set as the output. The experimental data from pulsed infrared thermography tests of TBCs with flat bottom hole defects was selected as the training and testing sample. Markov-PCA-BP predictive system was arrived, based on which both the defect depth and diameter were identified accurately, which proved the effectiveness of the proposed method for quantitative detection of debonding defects in TBCs.

  10. Comparison of PCA Based and 2DPCA Based Face Recognition Systems

    Directory of Open Access Journals (Sweden)

    Dr. V. RADHA,

    2010-12-01

    Full Text Available With the growth of information technology coupled with the need for high security, the application of biometric as identification and recognition process has received special attention. The biometric authentication systems are gaining importance and in particular, face biometric is more preferred for person authentication because of its easy and non-intrusive method during acquisition procedure. Various methods are used for facial recognition, out of which Principal Component Analysis (PCA based systems are frequently used. This papercompares the performance of two face recognition systems, which focus on the use of PCA for the analysis and recognition while using face biometric for authentication. Several experiments were conducted to evaluate the performance the two systems and were assessed in terms of accuracy and speed.

  11. PCA 4 DCA: The Application Of Principal Component Analysis To The Dendritic Cell Algorithm

    CERN Document Server

    Gu, Feng; Oates, Robert; Aickelin, Uwe

    2010-01-01

    As one of the newest members in the ?field of arti?cial immune systems (AIS), the Dendritic Cell Algorithm (DCA) is based on behavioural models of natural dendritic cells (DCs). Unlike other AIS, the DCA does not rely on training data, instead domain or expert knowledge is required to predetermine the mapping between input signals from a particular instance to the three categories used by the DCA. This data preprocessing phase has received the criticism of having manually over-?tted the data to the algorithm, which is undesirable. Therefore, in this paper we have attempted to ascertain if it is possible to use principal component analysis (PCA) techniques to automatically categorise input data while still generating useful and accurate classication results. The integrated system is tested with a biometrics dataset for the stress recognition of automobile drivers. The experimental results have shown the application of PCA to the DCA for the purpose of automated data preprocessing is successful.

  12. Analgesia pós-operatória para procedimentos cirúrgicos ortopédicos de quadril e fêmur: comparação entre bloqueio do compartimento do psoas e bloqueio perivascular inguinal Analgesia postoperatoria para procedimientos quirúrgicos ortopédicos de cadera y fémur: comparación entre bloqueo del compartimiento del psoas y bloqueo perivascular inguinal Postoperative analgesia for orthopedic surgeries of the hip and femur: a comparison between psoas compartment and inguinal paravascular blocks

    OpenAIRE

    Luiz Eduardo Imbelloni; Lúcia Beato; Carolina Beato; José Antônio Cordeiro

    2006-01-01

    JUSTIFICATIVA E OBJETIVOS: Este estudo avaliou a eficácia da injeção única de bupivacaína a 0,25% no compartimento do psoas ou perivascular inguinal por meio do estimulador de nervos periféricos para analgesia pós-operatória em pacientes submetidos a intervenções cirúrgicas ortopédicas. MÉTODO: Cem pacientes receberam bloqueio do plexo lombar através do compartimento do psoas e foram comparados com 100 pacientes que receberam bloqueio do plexo lombar via perivascular inguinal, identificados p...

  13. A comparative study of oral tapentadol with thoracic epidural analgesia versus intravenous tramadol and paracetamol combination for postoperative analgesia in off pump CABG

    Directory of Open Access Journals (Sweden)

    Himanshu A. Shah

    2013-12-01

    Conclusions: Our study concludes that Tapentadol with Thoracic epidural is very much effective as a multimodal analgesia approach in controlling acute postoperative pain after CABG. Tapentadol is quite a newer drug so its usefulness for other patients and different surgeries is still to be debated. [Int J Basic Clin Pharmacol 2013; 2(6.000: 723-727

  14. Focused analgesia in waking and hypnosis: effects on pain, memory, and somatosensory event-related potentials.

    Science.gov (United States)

    De Pascalis, Vilfredo; Cacace, Immacolata; Massicolle, Francesca

    2008-01-01

    Somatosensory event-related potentials (SERPs) to painful electric standard stimuli under an odd-ball paradigm were analyzed in 12 high hypnotizable (HH), 12 medium hypnotizable (MH), and 12 low hypnotizable (LH) subjects during waking, hypnosis, and a cued eyes-open posthypnotic condition. In each of these conditions subjects were suggested to produce an obstructive imagery of stimulus perception as a treatment for pain reduction. A No-Analgesia treatment served as a control in waking and hypnosis conditions. The subjects were required to count the number of delivered target stimuli. HH subjects experienced significant pain and distress reductions during posthypnotic analgesia as compared to hypnotic analgesia and between these two analgesic conditions as compared to the two control conditions. Outside of hypnosis, these subjects remembered less pain and distress levels than they reported during hypnotic and posthypnotic analgesia treatments. In contrast, for waking-analgesia treatment, HH subjects remembered similar pain and distress levels to those they reported concurrently with the stimulation. HH subjects, during hypnotic and posthypnotic analgesia treatments, detected a smaller number of target stimuli and displayed a significant amplitude reduction of the midline frontal and central N140 and P200 SERP components. No significant SERP differences were observed for these subjects between treatments in waking condition and between hypnotic and posthypnotic analgesic treatments. For the MH and LH subjects no significant N140 and P200 amplitude changes were observed among analgesic conditions as compared to control conditions. These amplitude findings are seen as indicating that hypnotic analgesia can affect earlier and later stages of stimulus processing. PMID:18023535

  15. The knowledge and attitudes of nonanesthesia nurses regarding postoperative epidural analgesia.

    Science.gov (United States)

    Sandie, C L; Heindel, L J

    1999-10-01

    The provision of epidural analgesia for postoperative pain control offers many patient benefits and has become commonplace on many nursing units. Since nurses are responsible for the day-to-day management of patients receiving epidural analgesia, their knowledge, attitudes, and practices regarding this technique are pivotal to its success. Therefore, the purpose of the present descriptive study was to examine the knowledge base, attitudes, and clinical practice of registered nurses (N = 85) regarding postoperative epidural analgesia as managed by an acute pain service (APS). Information was obtained from a survey distributed via a convenience sample to all nurses working on 6 units in a large military teaching facility. We developed the "Epidural Knowledge and Attitude Survey" using the nursing literature on epidural analgesia. The survey consisted of a demographics section, true/false (T/F) questions, multiple choice (M/C) questions, an attitude section, and a comment section. These sections addressed the nurses' knowledge, attitudes, and practices in regard to epidural pharmacology, management, and adverse effects, as well as their general satisfaction with the APS of their facility. Data were analyzed statistically using means, standard deviations, percentages, forward step-wise linear regression, the Fisher-Irwin (exact) test, the chi 2 test, and analysis of variance with Bonferroni multiple comparisons. A P value of attitude section illustrated that 73% of nurses had "positive" attitudes toward epidural analgesia. Correct management of patients receiving epidural analgesia was being practiced by 77% of nurses. The satisfaction with the APS at this facility was 32% "very satisfied" and 62% "somewhat satisfied." The demographic characteristics that best predicted a higher score on the knowledge portion of the survey were greater years of practice as a nurse and receipt of pain education in nursing training. Nurses who had received inservice education about

  16. SU-C-BRF-03: PCA Modeling of Anatomical Changes During Head and Neck Radiation Therapy

    Energy Technology Data Exchange (ETDEWEB)

    Chetvertkov, M; Kim, J; Siddiqui, F; Kumarasiri, A; Chetty, I; Gordon, J [Henry Ford Health System, Detroit, MI (United States)

    2014-06-15

    Purpose: To develop principal component analysis (PCA) models from daily cone beam CTs (CBCTs) of head and neck (H and N) patients that could be used prospectively in adaptive radiation therapy (ART). Methods: : For 7 H and N patients, Pinnacle Treatment Planning System (Philips Healthcare) was used to retrospectively deformably register daily CBCTs to the planning CT. The number N of CBCTs per treatment course ranged from 14 to 22. For each patient a PCA model was built from the deformation vector fields (DVFs), after first subtracting the mean DVF, producing N eigen-DVFs (EDVFs). It was hypothesized that EDVFs with large eigenvalues represent the major anatomical deformations during the course of treatment, and that it is feasible to relate each EDVF to a clinically meaningful systematic or random change in anatomy, such as weight loss, neck flexion, etc. Results: DVFs contained on the order of 3×87×87×58=1.3 million scalar values (3 times the number of voxels in the registered volume). The top 3 eigenvalues accounted for ∼90% of variance. Anatomical changes corresponding to an EDVF were evaluated by generating a synthetic DVF, and applying that DVF to the CT to produce a synthetic CBCT. For all patients, the EDVF for the largest eigenvalue was interpreted to model weight loss. The EDVF for other eigenvalues appeared to represented quasi-random fraction-to-fraction changes. Conclusion: The leading EDVFs from single-patient PCA models have tentatively been identified with weight loss changes during treatment. Other EDVFs are tentatively identified as quasi-random inter-fraction changes. Clean separation of systematic and random components may require further work. This work is expected to facilitate development of population-based PCA models that can be used to prospectively identify significant anatomical changes, such as weight loss, early in treatment, triggering replanning where beneficial.

  17. Sparse PCA, a new method for unsupervised analyses of fMRI data

    OpenAIRE

    Sjöstrand, Karl; Lund, Torben E; Madsen, Kristoffer Hougaard; Larsen, Rasmus

    2006-01-01

    Exploratory analysis of functional MRI data aims at revealing known as well as unknown properties in a data-driven manner devoid of hypotheses on the time course of the hemodynamic response. This uncommitted approach usually precedes confirmatory modeling and may point to unexpected results that otherwise would be lost. Common approaches include clustering methods, principal component analysis (PCA) and in particular independent component analysis (ICA). ICA assumes that the measured activity...

  18. An Effective Method of Monitoring the Large-Scale Traffic Pattern Based on RMT and PCA

    OpenAIRE

    Xuetao Du; Jian Yuan; Peng Gao; Jia Liu

    2010-01-01

    Mechanisms to extract the characteristics of network traffic play a significant role in traffic monitoring, offering helpful information for network management and control. In this paper, a method based on Random Matrix Theory (RMT) and Principal Components Analysis (PCA) is proposed for monitoring and analyzing large-scale traffic patterns in the Internet. Besides the analysis of the largest eigenvalue in RMT, useful information is also extracted from small eigenvalues by a method based on P...

  19. The Postoperative Analgesic Effect of Morphine and Paracetamol in the Patients Undergoing Laparotomy, Using PCA Method

    OpenAIRE

    Yaghoubi, Siamak; Pourfallah, Reza; Barikani, Ameneh; Kayalha, Hamid

    2013-01-01

    Objective: postoperative pain increases the activity of the sympathetic system, causes hypermetabolic conditions, retains salt and water, increases glucose, fatty acid lactate and oxygen consumption, weakens the immunity system which delays wound healing. Our object was comparison of the analgesic effect of morphine and paracetamol in the patients undergoing laparotomy, using PCA method. Method: Seventy patients who had undergone laparotomy were studied using double blind randomized clinical ...

  20. Feature extraction and recognition of epileptiform activity in EEG by combining PCA with ApEn

    OpenAIRE

    Wang, Chunmei; Zou, Junzhong; Zhang, Jian; WANG Min; Wang, Rubin

    2010-01-01

    This paper proposes a new method for feature extraction and recognition of epileptiform activity in EEG signals. The method improves feature extraction speed of epileptiform activity without reducing recognition rate. Firstly, Principal component analysis (PCA) is applied to the original EEG for dimension reduction and to the decorrelation of epileptic EEG and normal EEG. Then discrete wavelet transform (DWT) combined with approximate entropy (ApEn) is performed on epileptic EEG and normal EE...

  1. SU-C-BRF-03: PCA Modeling of Anatomical Changes During Head and Neck Radiation Therapy

    International Nuclear Information System (INIS)

    Purpose: To develop principal component analysis (PCA) models from daily cone beam CTs (CBCTs) of head and neck (H and N) patients that could be used prospectively in adaptive radiation therapy (ART). Methods: : For 7 H and N patients, Pinnacle Treatment Planning System (Philips Healthcare) was used to retrospectively deformably register daily CBCTs to the planning CT. The number N of CBCTs per treatment course ranged from 14 to 22. For each patient a PCA model was built from the deformation vector fields (DVFs), after first subtracting the mean DVF, producing N eigen-DVFs (EDVFs). It was hypothesized that EDVFs with large eigenvalues represent the major anatomical deformations during the course of treatment, and that it is feasible to relate each EDVF to a clinically meaningful systematic or random change in anatomy, such as weight loss, neck flexion, etc. Results: DVFs contained on the order of 3×87×87×58=1.3 million scalar values (3 times the number of voxels in the registered volume). The top 3 eigenvalues accounted for ∼90% of variance. Anatomical changes corresponding to an EDVF were evaluated by generating a synthetic DVF, and applying that DVF to the CT to produce a synthetic CBCT. For all patients, the EDVF for the largest eigenvalue was interpreted to model weight loss. The EDVF for other eigenvalues appeared to represented quasi-random fraction-to-fraction changes. Conclusion: The leading EDVFs from single-patient PCA models have tentatively been identified with weight loss changes during treatment. Other EDVFs are tentatively identified as quasi-random inter-fraction changes. Clean separation of systematic and random components may require further work. This work is expected to facilitate development of population-based PCA models that can be used to prospectively identify significant anatomical changes, such as weight loss, early in treatment, triggering replanning where beneficial

  2. Extraction of Prostatic Lumina and Automated Recognition for Prostatic Calculus Image Using PCA-SVM

    OpenAIRE

    D. Joshua Liao; Yusheng Huang; Xiaofen Xing; Hua Wang; Jian Liu; Hui Xiao; Zhuocai Wang; Xiaojun Ding; Xiangmin Xu

    2011-01-01

    Identification of prostatic calculi is an important basis for determining the tissue origin. Computation-assistant diagnosis of prostatic calculi may have promising potential but is currently still less studied. We studied the extraction of prostatic lumina and automated recognition for calculus images. Extraction of lumina from prostate histology images was based on local entropy and Otsu threshold recognition using PCA-SVM and based on the texture features of prostatic calculus. The SVM cla...

  3. ERROR PROTECTION OF PCA BASED FACE RECOGNITION FOR TRANSMISSION OVER NOISY CHANNELS

    OpenAIRE

    Anbarjafari, Gholamreza; Hasan DEMIREL; Aykut HOCANIN; Cağrı OZCINAR

    2013-01-01

    In this paper, we have proposed a system for reliable communication of coded grayscale facial images over noisy channels. Principle Component Analysis (PCA) is used for face dimensional reduction and face recognition and Repeated Bit Representation (RBR) is proposed to code the eigenfaces for mobile communication applications. Recognition obtained with RBR system approach reaches to %82 for 80 test images (2 poses per person) and 320 training images (8 poses per person) of ORL, by considering...

  4. Study on the Urban Development Level in Hubei Province Based on PCA and AHP

    OpenAIRE

    Yazhou Xiong; Ji Ke; Jingyuan Xing; Jingfu Chen

    2013-01-01

    Based on the major cities in Hubei province as the research object, the comprehensive evaluation indicator system and evaluation model of the urban development level evaluation in Hubei are proposed via systems analysis. The study makes a Principal Components Analysis (PCA) to the original data by means of SPSS; Next, this study analyzes the studied data via Analytic Hierarchy Process (AHP) as well as illuminates the key principles of the AHP and that, comprehensive score and ranking of devel...

  5. PCA-BASED EX-ANTE FORECASTING OF SWAP TERM STRUCTURES

    OpenAIRE

    OLIVER BLASKOWITZ; HELMUT HERWARTZ

    2009-01-01

    In this study, we forecast the term structure of EURIBOR swap rates by means of rolling vector autoregressive (VAR) models. In advance, a principal component analysis (PCA) is adopted to reduce the dimensionality of the term structure. To statistically assess the forecasting performance for particular rates and the level, slope and curvature of the swap term structure, we rely on the Henrikkson–Merton statistic. Economic performance is investigated by means of cash flows implied by alternativ...

  6. Spike sorting of heterogeneous neuron types by multimodality-weighted PCA and explicit robust variational Bayes

    OpenAIRE

    Takashi eTakekawa; Yoshikazu eIsomura; Tomoki eFukai

    2012-01-01

    This study introduces a new spike sorting method that classifies spike waveforms from multiunit recordings into spike trains of individual neurons. In particular, we develop a method to sort a spike mixture generated by a heterogeneous neural population. Such a spike sorting has a significant practical value, but was previously difficult. The method combines a feature extraction method, which we may term “multimodality-weighted principal component analysis” (mPCA), and a clustering method by ...

  7. Functional PCA of measures for investigating the influence of bioturbation on sediment structure

    OpenAIRE

    Manté, Claude; Stora, Georges

    2012-01-01

    After describing the main characteristics of grain-size curves, we recall previous results about Principal Components Analysis of absolutely continuous measures, in connection with grain-size curves analysis. This method simultaneously takes into account a chosen reference probability (r.p.) μ (associated with a Radon-Nikodym derivation operator), and the imposed sampling mesh Tp. The point is that it amounts to usual PCA in some metrics M− (Tp; μ); consequently, analyzing a set of grain-size...

  8. Transversus Abdominis Plane Catheter Bolus Analgesia after Major Abdominal Surgery

    Directory of Open Access Journals (Sweden)

    Nils Bjerregaard

    2012-01-01

    Full Text Available Purpose. Transversus abdominis plane (TAP blocks have been shown to reduce pain and opioid requirements after abdominal surgery. The aim of the present case series was to demonstrate the use of TAP catheter injections of bupivacaine after major abdominal surgery. Methods. Fifteen patients scheduled for open colonic resection surgery were included. After induction of anesthesia, bilateral TAP catheters were placed, and all patients received a bolus dose of 20 mL bupivacaine 2.5 mg/mL with epinephrine 5 μg/mL through each catheter. Additional bolus doses were injected bilaterally 12, 24, and 36 hrs after the first injections. Supplemental pain treatment consisted of paracetamol, ibuprofen, and gabapentin. Intravenous morphine was used as rescue analgesic. Postoperative pain was rated on a numeric rating scale (NRS, 0–10 at regular predefined intervals after surgery, and consumption of intravenous morphine was recorded. Results. The TAP catheters were placed without any technical difficulties. NRS scores were ≤3 at rest and ≤5 during cough at 4, 8, 12, 18, 24, and 36 hrs after surgery. Cumulative consumption of intravenous morphine was 28 (23–48 mg (median, IQR within the first 48 postoperative hours. Conclusion. TAP catheter bolus injections can be used to prolong analgesia after major abdominal surgery.

  9. Sedations and analgesia in patients undergoing percutaneous transhepatic biliary drainage

    Energy Technology Data Exchange (ETDEWEB)

    Hatzidakis, A.A.; Charonitakis, E.; Athanasiou, A.; Tsetis, D.; Chlouverakis, G.; Papamastorakis, G.; Roussopoulou, G.; Gourtsoyiannis, N.C

    2003-02-01

    AIM: To present our experience using intravenous sedoanalgesia for percutaneous biliary drainage. MATERIALS AND METHODS: This study comprised 100 patients, all of whom were continuously monitored [electrocardiogram (ECG), blood pressure, pulse oxymetry] and received an initial dose of 2 mg midazolam followed by 0.02 mg fentanyl. Before every anticipated painful procedure, a maintenance dose of 0.01 mg fentanyl was administered. If the procedure continued and the patient became aware, another 1 mg midazolam was given. This was repeated if patients felt pain. A total dose of 0.08 mg fentanyl and 7 mg midazolam was never exceeded. Immediately after the procedure, the nurse was asked to evaluate patients' pain score. The patients were asked 3 h later to complete a visual 10-degree pain score scale. RESULTS: The average dose of fentanyl and midazolam was 0.042 mg (0.03-0.08 mg) and 4.28 mg (2-7 mg), respectively. Only one patient recorded the procedure as painful. The scores given by the attending nurse (1-7 points, mean 2.9) correlated well with those given by the patients (1-6 points, mean 2.72). No complications were noted. CONCLUSION: According to our experience, interventional radiologists practising biliary procedures can administer low doses of midazolam and minimize the doses of fentanyl, without loss of adequate sedation and analgesia. Hatzidakis, A. A. et al. (2003). Clinical Radiology58, 121-127.

  10. RESULTS OF THE MEGAVERTEBRATE ANALGESIA SURVEY: ELEPHANTS AND RHINO.

    Science.gov (United States)

    Kottwitz, Jack; Boothe, Matthew; Harmon, Roy; Citino, Scott B; Zuba, Jeffery R; Boothe, Dawn M

    2016-03-01

    An online survey utilizing Survey Monkey linked through the American Association of Zoo Veterinarians listserve examined current practices in megavertebrate analgesia. Data collected included drugs administered, dosing regimens, ease of administration, efficacy, and adverse events. Fifty-nine facilities (38 housing elephants, 33 housing rhinoceroses) responded. All facilities administered nonsteroidal anti-inflammatory drugs (NSAIDs), with phenylbutazone (0.25-10 mg/kg) and flunixin meglumine (0.2-4 mg/kg) being most common. Efficacy was reported as "good" to "excellent" for these medications. Opioids were administered to elephants (11 of 38) and rhinoceroses (7 of 33), with tramadol (0.5-3.0 mg/kg) and butorphanol (0.05-1.0 mg/kg) being most common. Tramadol efficacy scores were highly variable in both elephants and rhinoceroses. While drug choices were similar among institutions, substantial variability in dosing regimens and reported efficacy between and within facilities indicates the need for pharmacokinetic studies and standardized methods of analyzing response to treatment to establish dosing regimens and clinical trials to establish efficacy and safety. PMID:27010292

  11. Augmentation of acetaminophen analgesia by the antihistamine phenyltoloxamine.

    Science.gov (United States)

    Sunshine, A; Zighelboim, I; De Castro, A; Sorrentino, J V; Smith, D S; Bartizek, R D; Olson, N Z

    1989-07-01

    A double-blind, placebo-controlled, parallel-group study was performed to compare the analgesic activity of the combination of 650 mg acetaminophen plus 60 mg phenyltoloxamine citrate with that of 650 mg acetaminophen alone. Two hundred female inpatients who had severe pain associated with a recent episiotomy procedure were randomly assigned to receive a single dose of one of the two active treatments or a placebo. Analgesia was assessed over a 6-hour period. Treatments were compared on the basis of standard subjective scales for pain intensity and relief, a number of derived variables based on these data and two global measures. For essentially all measures, the two active treatments were significantly superior to the placebo control. The combination was significantly superior to acetaminophen alone for all analgesic measures including SPID, TOTAL, and global ratings. The results of this study demonstrate that 60 mg phenyltoloxamine produces significant augmentation of the analgesic activity of 650 mg acetaminophen in postepisiotomy pain. PMID:2569485

  12. Preventive local analgesia in orthopedic and Traumatology surgery.

    Directory of Open Access Journals (Sweden)

    Hugo Jiménez Vázquez

    2005-11-01

    Full Text Available Fundament: One of the most important aims of modern surgery is the recovery of the ill patients and heir integration to society. Sometimes, this wish has its limitations because of the persistence of pain after surgery. The development of an effective analgesic for after surgery pain is therefore a priority in modern medicine. Objective: To characterize the results obtained with the application of a preventive analgesic by infiltrating without limitations of the use of any other analgesic if necessary. Method: Prospective-descriptive study in a series of 30 patients assisted at the Orthopaedic Service of the ¨Dr. Gustavo Aldereguía Lima¨ Hospital from Cienfuegos province in the period that covers September 2004- march 2005. Anaesthetic infiltration in the surgical area was applied once the surgery was ended . Bupivacaine 0,125 % in a volume of 20 ml and 2 drops of epinephrine without avoiding the use of any other analgesic. Results: a group of 13 patients presented pain in the first 24-48 hours after surgery followed by another group of 9 patients who alleviated pain in the period between 12 and 23 hours after surgery. Conclusions: In this series of patients it was shown the benefits of anaesthetic infiltration in the surgical area with analgesic purposes, since it causes pain alleviation in a period greater than 24 hours. Bupivacaine shows good results since it causes after surgery analgesia and the early application in the rehabilitation of a great number of patients.

  13. The effect of Hegu acupoint stimulation in dental acupuncture analgesia

    Directory of Open Access Journals (Sweden)

    Fransiskus Andrianto

    2007-03-01

    Full Text Available In daily life, dental treatments are often related with oral pain sensation which needs anesthesia procedures. Sometimes local anesthetics can not be used because patients have hypersensitive reaction or systemic diseases which may lead to complications. Stimulating acupoint, such as Hegu activates hypothalamus and pituitary gland to release endogenous opioid peptide substances that reduce pain sensitivity. The aim of the study was to determine Hegu acupoint stimulation effect on the pain sensitivity reduction in maxillary central incisor gingiva. The laboratory experimental research was conducted on 12 healthy male Wistar rats (3 months old, weights 150–200 grams. All rat samples received the same treatments and adapted within 1 month. The research was done in pre and post test control group design. 40-Volt electro-stimulation was done once on the maxillary central incisor gingiva prior to the bilateral Hegu acupoint stimulation, then followed by 3 times electro-stimulation with 3 minutes intervals. The pain scores were obtained based on the samples’ contraction in each electro-stimulation. The responses were categorized into 5 pain scores and statistically analyzed using Wilcoxon Test. The results showed that Hegu acupoint stimulation lowered the pain scores significantly (p < 0.05. Hegu acupoint stimulation could reduce the pain sensitivity in maxillary central incisor gingiva. Therefore, the use of acupuncture analgesia in dental pain management can be considered in the future.

  14. Sedations and analgesia in patients undergoing percutaneous transhepatic biliary drainage

    International Nuclear Information System (INIS)

    AIM: To present our experience using intravenous sedoanalgesia for percutaneous biliary drainage. MATERIALS AND METHODS: This study comprised 100 patients, all of whom were continuously monitored [electrocardiogram (ECG), blood pressure, pulse oxymetry] and received an initial dose of 2 mg midazolam followed by 0.02 mg fentanyl. Before every anticipated painful procedure, a maintenance dose of 0.01 mg fentanyl was administered. If the procedure continued and the patient became aware, another 1 mg midazolam was given. This was repeated if patients felt pain. A total dose of 0.08 mg fentanyl and 7 mg midazolam was never exceeded. Immediately after the procedure, the nurse was asked to evaluate patients' pain score. The patients were asked 3 h later to complete a visual 10-degree pain score scale. RESULTS: The average dose of fentanyl and midazolam was 0.042 mg (0.03-0.08 mg) and 4.28 mg (2-7 mg), respectively. Only one patient recorded the procedure as painful. The scores given by the attending nurse (1-7 points, mean 2.9) correlated well with those given by the patients (1-6 points, mean 2.72). No complications were noted. CONCLUSION: According to our experience, interventional radiologists practising biliary procedures can administer low doses of midazolam and minimize the doses of fentanyl, without loss of adequate sedation and analgesia. Hatzidakis, A. A. et al. (2003). Clinical Radiology58, 121-127

  15. An Empirical Method for Improving the Quality of RXTE PCA Spectra

    CERN Document Server

    Garcia, Javier; Steiner, James F; Remillard, Ronald A; Grinberg, Victoria

    2014-01-01

    We fitted all of the several hundred {\\it RXTE} PCA spectra of the Crab individually to a simple power-law model; the total number of counts in the composite spectrum is $>10^9$. We then used the spectrum of residuals to derive a calibration tool, called {\\tt pcacorr}, that we apply to large samples of spectra for GX~339--4, H1743--322, and XTE J1550--564. Application of the tool improved the quality of all the fits, and the improvement is dramatic for spectra with $\\gtrsim10^7$ counts. The Crab residual spectrum is somewhat different for each of the five PCA detectors, but it was relatively stable over the course of the mission. We recommend that {\\tt pcacorr} be routinely applied to spectra with $\\gtrsim10^6$ counts and that one include a systematic error of 0.1\\%, rather than the 0.5--1\\% value that has customarily been used. We expect that application of the tool will result in an increase in sensitivity of the PCA to faint spectral features by up to an order of magnitude.

  16. An empirical method for improving the quality of RXTE PCA spectra

    International Nuclear Information System (INIS)

    We fitted all of the several hundred RXTE PCA spectra of the Crab individually to a simple power-law model; the total number of counts in the composite spectrum is >109. We then used the spectrum of residuals to derive a calibration tool, called pcacorr, that we apply to large samples of spectra for GX 339-4, H1743-322, and XTE J1550-564. Application of the tool improved the quality of all the fits, and the improvement is dramatic for spectra with ≳ 107 counts. The Crab residual spectrum is somewhat different for each of the five Proportional Counter Array (PCA) detectors, but it was relatively stable over the course of the mission. We recommend that pcacorr be routinely applied to spectra with ≳ 106 counts and that one include a systematic error of 0.1%, rather than the 0.5-1% value that has customarily been used. We expect that application of the tool will result in an increase in sensitivity of the PCA to faint spectral features by up to an order of magnitude.

  17. An empirical method for improving the quality of RXTE PCA spectra

    Energy Technology Data Exchange (ETDEWEB)

    García, Javier A.; McClintock, Jeffrey E.; Steiner, James F. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Remillard, Ronald A.; Grinberg, Victoria, E-mail: javier@head.cfa.harvard.edu, E-mail: jem@cfa.harvard.edu, E-mail: jsteiner@head.cfa.harvard.edu, E-mail: rr@space.mit.edu, E-mail: grinberg@space.mit.edu [MIT Kavli Institute for Astrophysics and Space Research, MIT, 70 Vassar Street, Cambridge, MA 02139 (United States)

    2014-10-10

    We fitted all of the several hundred RXTE PCA spectra of the Crab individually to a simple power-law model; the total number of counts in the composite spectrum is >10{sup 9}. We then used the spectrum of residuals to derive a calibration tool, called pcacorr, that we apply to large samples of spectra for GX 339-4, H1743-322, and XTE J1550-564. Application of the tool improved the quality of all the fits, and the improvement is dramatic for spectra with ≳ 10{sup 7} counts. The Crab residual spectrum is somewhat different for each of the five Proportional Counter Array (PCA) detectors, but it was relatively stable over the course of the mission. We recommend that pcacorr be routinely applied to spectra with ≳ 10{sup 6} counts and that one include a systematic error of 0.1%, rather than the 0.5-1% value that has customarily been used. We expect that application of the tool will result in an increase in sensitivity of the PCA to faint spectral features by up to an order of magnitude.

  18. Aquatic toxicity assessment of esters towards the Daphnia magna through PCA-ANFIS.

    Science.gov (United States)

    Asadollahi-Baboli, M

    2013-10-01

    The widespread production of esters combined with their ability to migrate in different compartments, makes their environmental toxicity important. In this background, the multivariate image analysis-quantitative structure-toxicity relationship (MIA-QSTR) method coupled to principal component analysis-adaptive neuro-fuzzy inference systems (PCA-ANFIS) was applied to assess the toxicity of esters to Daphnia magna. In MIA-QSTR, pixels of chemical structures (2D images) stand for descriptors, and structural changes account for the variance in toxicities. The ANFIS procedure was capable of correlating the inputs (PCA scores) with the toxicities accurately. The PCA-ANFIS also was statistically validated for its predictive power using cross-validation, applicability domain and Y-scrambling evaluation procedures. The satisfactory results (R p (2) = 0.926, Q LOO (2) = 0.887, R L25%O (2) = 0.843, RMSELOO = 0.320 and RMSEL25%O = 0.379) suggests that the QSTR model could be proposed as an alternative method for aquatic toxicity assessment of esters allowing possible application in the European Union regulation REACH. PMID:23884170

  19. Face Detection and Recognition Using Viola-Jones with PCA-LDA and Square Euclidean Distance

    Directory of Open Access Journals (Sweden)

    Nawaf Hazim Barnouti

    2016-05-01

    Full Text Available In this paper, an automatic face recognition system is proposed based on appearance-based features that focus on the entire face image rather than local facial features. The first step in face recognition system is face detection. Viola-Jones face detection method that capable of processing images extremely while achieving high detection rates is used. This method has the most impact in the 2000’s and known as the first object detection framework to provide relevant object detection that can run in real time. Feature extraction and dimension reduction method will be applied after face detection. Principal Component Analysis (PCA method is widely used in pattern recognition. Linear Discriminant Analysis (LDA method that used to overcome drawback the PCA has been successfully applied to face recognition. It is achieved by projecting the image onto the Eigenface space by PCA after that implementing pure LDA over it. Square Euclidean Distance (SED is used. The distance between two images is a major concern in pattern recognition. The distance between the vectors of two images leads to image similarity. The proposed method is tested on three databases (MUCT, Face94, and Grimace. Different number of training and testing images are used to evaluate the system performance and it show that increasing the number of training images will increase the recognition rate.

  20. Patient-controlled Analgesia in Intrathecal Therapy for Chronic Pain: Safety and Effective Operation of the Model 8831 Personal Therapy Manager with a Pre-implanted SynchroMed Infusion System.

    Science.gov (United States)

    Maeyaert, Jan; Buchser, Eric; Van Buyten, Jean-Pierre; Rainov, Nikolai G; Becker, Ralf

    2003-07-01

    The Model 8831 Personal Therapy Manager (PTM) offers a patient-controlled analgesia (PCA) option for the SynchroMed Infusion System (Medtronic Inc., Minneapolis, MN). The safety and effective operation of the PTM activator was evaluated in 45 patients in five European centers receiving intrathecal drug infusion for the treatment of chronic pain via a SynchroMed pump. The total volume of drug delivered intrathecally over a four-week follow-up period was calculated. Adverse events were recorded and pain levels were measured via the Visual Analog pain Scale (VAS), Brief Pain Inventory, and SF-12 Quality of Life scores. Patient satisfaction with the device and its instruction manual was also assessed by questionnaire. The expected and calculated intrathecal drug volumes (and therefore drug doses) were the same, demonstrating that the device worked as intended. There were no device-related serious adverse events. Overall, 96% of patients were satisfied with the activator. Patients appreciated being able to control their pain and considered the device and its instructions easy to use. The PTM was shown to be safe and functioning properly in the intrathecal treatment of pain. The successful addition of a PCA function to the SynchroMed system may create a new standard in intrathecal pain therapy. PMID:22151016

  1. Effect of parecoxib sodium on vein analgesia after orthopaedic lumbar spine surgery%帕瑞昔布钠对腰椎内固定术后静脉镇痛效果的影响

    Institute of Scientific and Technical Information of China (English)

    陈晓光; 侯轶楠; 李平

    2013-01-01

    Objective To investigate the effect of parecoxib sodium on vein analgesia after orthopaedic lumbar spine surgery. Methods 60 cases underwent selective orthopaedic lumbar spine surgery under general anesthesia were randomly divided equally into two groups. Group A received intravenous parecoxib sodium 40 mg,and group B received intravenous NS 2 mL instead of parecoxib sodium at 30 min before the end of operation. All the patients received PCIA immediately after surgery. Pain intensity was measured by visual analog scale( VAS )score at the time of awaking and 2 ,4 ,8 ,24 ,48 h after operation. The total consumption of sufentanil, the valid number of pressing PCA pump were recorded at 24,48 h after operation. Meanwhile, the score of Ramsay sedation scale and the adverse effects were observed after operation. Results There were significant differences in the VAS score, valid number of pressing PCA pump and sufentanil consumption between the two groups( P 0.05),镇痛期间各种不良反应发生率比较差异无统计学意义(P>0.05).结论 静脉注射帕瑞昔布钠40 mg用于腰椎内固定手术术后镇痛可以增强舒芬太尼PCA镇痛效果.

  2. Bloqueio seletivo dos nervos supraescapular e axilar promove analgesia satisfatória e menor grau de bloqueio motor: comparação com o bloqueio interescalênico El bloqueo selectivo de los nervios supraescapular y axilar promueve una analgesia satisfactoria y un menor grado de bloqueo motor: comparación con el bloqueo interescalénico Selective suprascapular and axillary nerve block provides adequate analgesia and minimal motor block: comparison with interscalene block

    Directory of Open Access Journals (Sweden)

    Patrícia Falcão Pitombo

    2013-02-01

    . El objetivo de este estudio fue comparar el bloqueo de los nervios supraescapular y axilar en las cirugías artroscópicas de hombro con el abordaje interescalénico del plexo braquial. MÉTODO: Sesenta y ocho pacientes fueron ubicados en dos grupos de 34, de acuerdo con la técnica utilizada: grupo Interescalénico (GI y grupo selectivo (GS, siendo ambos abordajes realizados con neuroestimulador. En el GI, y después de la respuesta motora adecuada, se inyectaron 30 mL de levopubivacaina en exceso enantiomérico de un 50% al 0,33% con adrenalina 1:200.000. En el GS, y después de la respuesta motora del nervio supraescapular y axilar, se inyectaron 15 mL de la misma sustancia en cada nervio. Enseguida se realizó la anestesia general. Las variables que se evaluaron fueron: tiempo para la realización de los bloqueos, analgesia, consumo de opioide, bloqueo motor, estabilidad cardiocirculatoria, satisfacción y aceptabilidad por parte del paciente. RESULTADOS: El tiempo para la ejecución del bloqueo interescalénico fue significativamente menor que para la realización del bloqueo selectivo. La analgesia fue significativamente mayor en el postoperatorio inmediato en el GI y en el postoperatorio tardío en el GS. El consumo de morfina fue significativamente mayor en la primera hora en el GS. El bloqueo motor fue significativamente menor en el GS. La estabilidad cardiocirculatoria, satisfacción y aceptabilidad de la técnica por el paciente no fueron diferentes entre los grupos. Ocurrió un fallo en el GI y dos en el GS. CONCLUSIONES: Ambas técnicas son seguras y eficaces con el mismo grado de satisfacción y de aceptabilidad. El bloqueo selectivo de ambos nervios presentó una analgesia satisfactoria, con la ventaja de proporcionar un bloqueo motor restringido al hombro.BACKGROUND AND OBJECTIVE: Shoulder arthroscopic surgeries evolve with intense postoperative pain. Several analgesic techniques have been advocated. The aim of this study was to compare suprascapular

  3. 基于PCA-SDG的水轮机调节系统故障诊断%Fault diagnosis of hydro turbine regulation system based on PCA-SDG

    Institute of Scientific and Technical Information of China (English)

    刘明华; 南海鹏; 余向阳

    2013-01-01

    讨论了基于符号有向图SDG的故障诊断方法,建立了闭环控制系统的SDG模型及故障诊断推理规则.利用经验方法建立了典型的水轮机调节系统的SDG模型及故障诊断推理规则.针对SDG模型节点符号确定的主观性问题及节点阈值的组合爆炸问题,将主元分析PCA方法与SDG模型结合用于故障诊断.利用系统运行数据建立主元分析PCA模型,根据PCA模型构造残差统计量进行故障检测,当有故障发生时,将每一检测分量对残差统计量的贡献率与设定的贡献率阈值比较,得到各检测分量的定性符号值,该符号值作为SDG模型中相应节点的符号,根据SDG推理规则进行故障推理,找出故障源.根据现场运行数据建立水轮机调节系统的PCA模型,应用PCA-SDG故障诊断方法对其进行故障诊断,模拟系统传感器恒偏差故障,对故障诊断过程进行仿真,结果证明该PCA-SDG故障诊断方法对水轮机调节系统是有效的.

  4. The effects of low-dose ketamine on the analgesia nociception index (ANI) measured with the novel PhysioDoloris™ analgesia monitor: a pilot study.

    Science.gov (United States)

    Bollag, Laurent; Ortner, Clemens M; Jelacic, Srdjan; Rivat, Cyril; Landau, Ruth; Richebé, Philippe

    2015-04-01

    The PhysioDoloris™ analgesia monitor assesses nociception effects on the autonomic nervous system by analyzing changes in heart rate variability (HRV). This non-invasive device analyses ECG signals and determines the analgesia nociception index (ANI), allowing for quantitative assessment of the analgesia/nociception balance in anesthetized patients. Ketamine, an analgesic adjuvant with sympathomimetic properties, has been shown to improve perioperative pain management. The purpose of this pilot study was to evaluate whether low-dose ketamine, due to its intrinsic effect on the sino-atrial node, affects HRV and, therefore, interferes with ANI measurements. This pilot study included 20 women undergoing abdominal hysterectomies. Anesthesia and analgesia were maintained with sevoflurane and fentanyl respectively, in a standardized manner. Five minutes after intubation, 0.5 μg kg(-1) of intravenous (i.v.) ketamine was administered. ANI, bispectral index (BIS), heart rate and blood pressure were recorded from the induction of anesthesia until 5 min after skin incision. There was not any significant decrease in mean (±SD) ANI values after intubation (2.11±20.11, p=0.35) or i.v. ketamine administration (1.31±15.26, p=0.28). The mean (±SD) reduction in ANI values after skin incision was statistically significant (13.65±15.44, p=0.01), which is consistent with increased nociception. A single i.v. bolus of 0.5 μg kg(-1) ketamine did not influence the ANI values of 20 women under standardized general anesthesia conditions and absent noxious stimulation. These results suggest that the ANI derived from the PhysioDoloris™ analgesia monitor is feasible under such clinical conditions. PMID:25062948

  5. Polytrauma and continue epidural anesthesia. A case presentation. Politrauma y analgesia peridural continua. Presentación de un caso.

    Directory of Open Access Journals (Sweden)

    Aleida Hernández Lara

    2005-05-01

    Full Text Available This is a 62 year-old hypertensive patient who was admitted at the Intensive Care Unit of the ¨Dr. Gustavo Aldereguí­a Lima¨ hospital with multiple trauma in the skull, thorax abdomen and extremities. Left and right pleurothomy was performed by bilateral hemonoumothorax. The patient presented hemodynamic inestability so he needed vasoactive suport and an adequate management of the support of volume. The follow up revealed pain that didn´t alliviate with the habitual treatment, which seemed to worsen with treatment. Peridural anaesthesia was applied and it revealed clinical and ventilatory stability and avoided the deleterious effect of pain. The patient was discharged from the intensive care service without sequelae.

    Se presenta el caso de un paciente de 62 años con historia de hipertensión arterial que ingresa en Unidad de Cuidados Intensivos del Hospital Universitario ¨Dr. Gustavo Aldereguía Lima¨ de Cienfuegos por sufrir múltiples traumatismos : cráneo, tórax, abdomen y miembros. Fue necesario realizar pleurotomias, derecha e izquierda por hemoneumotórax bilateral, presentó inestabilidad hemodinámica que necesitó de apoyo vasoactivo y adecuado manejo del aporte de volumen . Predominó en la evolución el dolor rebelde al tratamiento habitual y que amenazaba con empeorar el pronóstico, por lo que se decide emplear la analgesia peridural, se logró estabilidad ventilatoria y clínica, se evitaron así los efectos deletéreos que provoca el dolor, con resultado final favorable y egreso del servicio sin mayores secuelas.

  6. Comparisons of different methods of anesthesia and analgesia on the levels of glycometabolism rate-limiting enzymes in erythrocytes and plasma glucose and stress hormones in patients undergoing esophagus surgery

    Institute of Scientific and Technical Information of China (English)

    Xiaokun Zhan; Xiongxiong Pan; Yinbin Pan; Jie Sun; Yanning Qian

    2008-01-01

    Objective: To compare the effects of different methods of anesthesia and analgesia on the activities of phosphofmctokinase(PFK), glucose-6-phosphate dehydrogenase(G-tPD) and aldose reductase(AR) in erythrocytes and levels of plasma glucose and stress hormones in patients undergoing esophagus surgery. Methods: Sixty-two patients scheduled for esophagus surgery were randomly divided into three groups: group I (n = 20) receiving only general anesthesia(GA) followed by intravenous patient controlled analgesia(PCA) with fentanyl 15 μg/kg. The other two groups receiving both general anesthesia combined with thoracic epidural anesthesia (GEA) and either intravenous PCA with fentanyl 15 μg/kg (group Ⅱ, n = 21) or thoracic epidurai analgesia(TEA) with 0.125% ropivaeaine and 0.0002% fentanyl mixture(group Ⅲ, n = 21) after the operation. Venous blood samples were collected for measurements of PFK, G-tPD and AR activities in erythrocytes and plasma glucose, conisol, epinephrine and norepinephrine before induction (T,1), 60 rain following the incision (T,2), 60 min(T,3) after operation, on the lst(T,4) and 2nd postoperative day(T5). Results: The activities of PFK decreased(P<0.01 or P=0.004) and the activities of G-tPD and AR increased(P<0.01) in groups Ⅰ and Ⅱ on T,4 compared with those on T,1. Between the two groups, the activities of these enzymes in group Ⅱ changed less than those of group Ⅰ (P<0.01 or P<0.05). These enzymes activities changed slightly in group Ⅲ on T,4(P>0.05). There were significant differences between group Ⅲ and the other two groups(P<0.01 or P<0.05). The levels of plasma glucose increased significantly on T,2(P<0.01), reached peak values on T,4(P<0.01) and fell on T,5 in the three groups. Compared to those of groups Ⅰ and Ⅱ, the values of plasma glucose in group Ⅲ were lower on T,4 and T,5(P<0.05 or P<0.01). The cortisol concentration in each group increased significantly at T,2(P<0.01 or P<0.05), and

  7. [The modulation of cerebral cortex and subcortical nuclei on NRM and their role in acupuncture analgesia].

    Science.gov (United States)

    Liu, X

    1996-01-01

    The vast research have demonstrated that the acupuncture analgesia is effected through a physiological mechanism brought about by the nervous system, particularly the central nervous system. We combined the acupuncture effects and theory of channels and collaterals with the new advance of pain neurophysiology, and centred attention on nucleus raphe magnus (NRM), that is one of the origins of the important descending inhibitory pathways of the intrinsic analgesic systems in brain. The unit discharges of NRM neurons and their nociceptors/ph responses were recorded extracellularly with glass microelectrode at 1495 neurons on 634 wastar rats. The modulation of cerebral cortex, the head of N. caudatum (NCa), N. Accumbens (N. Ac), N lateral habenular (NHa) and Periaquaeductal gray matter (PAG) on NRM and their role in acupuncture analgesia were studied by central locational stimulation, lesion and microinjection. The result were as follows: 1. The most NRM neurons could respond to noxious stimulation of tail tip with increasing or decreasing firing rate. Electroacupuncture (EA) at "Zusanli" could activate the NRM neuron, increasing discharges, and inhibit their nociceptive responses, producing analgesia. 2. The activity of NRM neuron was modulated by PAG, NAc, and NCa. Stimulation at one of them can activate neuron of NRM, increasing firing rate, and induce analgesia. When the lesion or microinjection naloxone were made in PAG, NAc or NCa, EA analgesia could be weakened or lost, even the nociceptive responses might be increased. It is suggest that the nuclei participated in EA analgesia with their endogenous opiate like substance, and were playing an important role. It is also indicated that the electroacupuncture was used on the patients with some nuclei lesion or pathological changes should be careful to avoid making patients feel more painful. 3. Somatosensory area II (Sm II) of cerebral cortex participated in EA analgesia. The analgesic effects of EA at "Zusanli

  8. Intravenous remifentanil versus epidural ropivacaine with sufentanil for labour analgesia: a retrospective study.

    Directory of Open Access Journals (Sweden)

    Rong Lin

    Full Text Available Remifentanil with appropriate pharmacological properties seems to be an ideal alternative to epidural analgesia during labour. A retrospective cohort study was undertaken to assess the efficacy and safety of remifentanil intravenous patient-controlled analgesia (IVPCA compared with epidural analgesia. Medical records of 370 primiparas who received remifentanil IVPCA or epidural analgesia were reviewed. Pain and sedation scores, overall satisfaction, the extent of pain control, maternal side effects and neonatal outcome as primary observational indicators were collected. There was a significant decline of pain scores in both groups. Pain reduction was greater in the epidural group throughout the whole study period (0 ∼ 180 min (P < 0.0001, and pain scores in the remifentanil group showed an increasing trend one hour later. The remifentanil group had a lower SpO2 (P < 0.0001 and a higher sedation score (P < 0.0001 within 30 min after treatment. The epidural group had a higher overall satisfaction score (3.8 ± 0.4 vs. 3.7 ± 0.6, P = 0.007 and pain relief score (2.9 ± 0.3 vs. 2.8 ± 0.4, P < 0.0001 compared with the remifentanil group. There was no significant difference on side effects between the two groups, except that a higher rate of dizziness (1% vs. 21.8%, P < 0.0001 was observed during remifentanil analgesia. And logistic regression analysis demonstrated that nausea, vomiting were associated with oxytocin usage and instrumental delivery, and dizziness was associated to the type and duration of analgesia. Neonatal outcomes such as Apgar scores and umbilical-cord blood gas analysis were within the normal range, but umbilical pH and base excess of neonatus in the remifentanil group were significantly lower. Remifentanil IVPCA provides poorer efficacy on labor analgesia than epidural analgesia, with more sedation on parturients and a trend of newborn acidosis. Despite these adverse effects, remifentanil IVPCA can still be an alternative

  9. Improved Algorithms for the Classification of Rough Rice Using a Bionic Electronic Nose Based on PCA and the Wilks Distribution

    Directory of Open Access Journals (Sweden)

    Sai Xu

    2014-03-01

    Full Text Available Principal Component Analysis (PCA is one of the main methods used for electronic nose pattern recognition. However, poor classification performance is common in classification and recognition when using regular PCA. This paper aims to improve the classification performance of regular PCA based on the existing Wilks ?-statistic (i.e., combined PCA with the Wilks distribution. The improved algorithms, which combine regular PCA with the Wilks ?-statistic, were developed after analysing the functionality and defects of PCA. Verification tests were conducted using a PEN3 electronic nose. The collected samples consisted of the volatiles of six varieties of rough rice (Zhongxiang1, Xiangwan13, Yaopingxiang, WufengyouT025, Pin 36, and Youyou122, grown in same area and season. The first two principal components used as analysis vectors cannot perform the rough rice varieties classification task based on a regular PCA. Using the improved algorithms, which combine the regular PCA with the Wilks ?-statistic, many different principal components were selected as analysis vectors. The set of data points of the Mahalanobis distance between each of the varieties of rough rice was selected to estimate the performance of the classification. The result illustrates that the rough rice varieties classification task is achieved well using the improved algorithm. A Probabilistic Neural Networks (PNN was also established to test the effectiveness of the improved algorithms. The first two principal components (namely PC1 and PC2 and the first and fifth principal component (namely PC1 and PC5 were selected as the inputs of PNN for the classification of the six rough rice varieties. The results indicate that the classification accuracy based on the improved algorithm was improved by 6.67% compared to the results of the regular method. These results prove the effectiveness of using the Wilks ?-statistic to improve the classification accuracy of the regular PCA approach. The

  10. Effects of multimodal analgesia on the success of mouse embryo transfer surgery.

    Science.gov (United States)

    Parker, John M; Austin, Jamie; Wilkerson, James; Carbone, Larry

    2011-07-01

    Multimodal analgesia is promoted as the best practice pain management for invasive animal research procedures. Universal acceptance and incorporation of multimodal analgesia requires assessing potential effects on study outcome. The focus of this study was to assess effects on embryo survival after multimodal analgesia comprising an opioid and nonsteroidal antiinflammatory drug (NSAID) compared with opioid-only analgesia during embryo transfer procedures in transgenic mouse production. Mice were assigned to receive either carprofen (5 mg/kg) with buprenorphine (0.1 mg/kg; CB) or vehicle with buprenorphine (0.1 mg/kg; VB) in a prospective, double-blinded placebo controlled clinical trial. Data were analyzed in surgical sets of 1 to 3 female mice receiving embryos chimeric for a shared targeted embryonic stem-cell clone and host blastocyst cells. A total of 99 surgical sets were analyzed, comprising 199 Crl:CD1 female mice and their 996 offspring. Neither yield (pups weaned per embryo implanted in the surgical set) nor birth rate (average number of pups weaned per dam in the set) differed significantly between the CB and VB conditions. Multimodal opioid-NSAID analgesia appears to have no significant positive or negative effect on the success of producing novel lines of transgenic mice by blastocyst transfer. PMID:21838973

  11. Analgesia Induced by Isolated Bovine Chromaffin Cells Implanted in Rat Spinal Cord

    Science.gov (United States)

    Sagen, Jacqueline; Pappas, George D.; Pollard, Harvey B.

    1986-10-01

    Chromaffin cells synthesize and secrete several neuroactive substances, including catecholamines and opioid peptides, that, when injected into the spinal cord, induce analgesia. Moreover, the release of these substances from the cells can be stimulated by nicotine. Since chromaffin cells from one species have been shown to survive when transplanted to the central nervous system of another species, these cells are ideal candidates for transplantation to alter pain sensitivity. Bovine chromaffin cells were implanted into the subarachnoid space of the lumbar spinal region in adult rats. Pain sensitivity and response to nicotine stimulation was determined at various intervals following cell implantation. Low doses of nicotine were able to induce potent analgesia in implanted animals as early as one day following their introduction into the host spinal cord. This response could be elicited at least through the 4 months the animals were tested. The induction of analgesia by nicotine in implanted animals was dose related. This analgesia was blocked by the opiate antagonist naloxone and partially attenuated by the adrenergic antagonist phentolamine. These results suggest that the analgesia is due to the stimulated release of opioid peptides and catecholamines from the implanted bovine chromaffin cells and may provide a new therapeutic approach for the relief of pain.

  12. Combined spinal-epidural analgesia in labour: its effects on delivery outcome

    Directory of Open Access Journals (Sweden)

    Suneet Kaur Sra Charanjit Singh

    2016-06-01

    Full Text Available ABSTRACT BACKGROUND AND OBJECTIVES: Combined spinal-epidural (CSE has become an increasingly popular alternative to traditional labour epidural due to its rapid onset and reliable analgesia provided. This was a prospective, convenient sampling study to determine the effects of CSE analgesia on labour outcome. METHODS: One hundred and ten healthy primigravida parturients with a singleton pregnancy of ≥37 weeks gestation and in the active phase of labour were studied. They were enrolled to the CSE (n = 55 or Non-CSE (n = 55 group based on whether they consented to CSE analgesia. Non-CSE parturients were offered other methods of labour analgesia. The duration of the first and second stage of labour, rate of instrumental vaginal delivery and emergency cesarean section, and Apgar scores were compared. RESULTS: The mean duration of the first and second stage of labour was not significantly different between both groups. Instrumental delivery rates between the groups were not significantly different (CSE group, 11% versus Non-CSE group, 16%. The slightly higher incidence of cesarean section in the CSE group (16% versus 15% in the Non-CSE group was not statistically significant. Neonatal outcome in terms of Apgar score of less than 7 at 1 and 5 min was similar in both groups. CONCLUSION: There were no significant differences in the duration of labour, rate of instrumental vaginal delivery and emergency cesarean section, and neonatal outcome in parturients who received compared to those who did not receive CSE for labour analgesia.

  13. Autoradiographic visualization on the role of central 3H-5-hydroxytryptamine in acupuncture analgesia

    International Nuclear Information System (INIS)

    The role played by central 5-hydroxytryptamine (5-HT) in electroacupuncture analgesia has been studied in rats by means of autoradiography with isotopic tracers 3H-5-HT. The purpose of the study is to determine the localization of 3H-5-HT in the midbrain raphe nuclei and in the mesencephalon aquaeduct as well as periaquaeductal gray matter. Parallel experiments were studied by freezing microautoradiographic method and histo-fixative microautoradiographic method. The analgesic effect of acupuncture can be enhanced or lowered by the increment or the decrement of the 5-HT level in the midbrain raphe nuclei and in the mesencephalon aquaeduct as well as periaquaeductal gray matter. The results show that when the rats were subjected to electro-acupuncture analgesia, the microautoradiographic intensities of 3H-5-HT both in the midbrain raphe nuclei and in the areas of mesencephalon aqueduct were significantly increased. It may be observed that the release of 5-HT in these regions of the brain is accelerated during acupuncture analgesia. From this it can be concluded that the midbrain raphe nuclei and the mesencephalon aquaeduct as well as the periaquaeductal gray matter are closely related to acupuncture analgesia. The results imply that 5-HT in these areas may be one of the most important neurochemical agents mediating acupuncture analgesia

  14. No evidence of a clinically important effect of adding local infusion analgesia administrated through a catheter in pain treatment after total hip arthroplasty

    DEFF Research Database (Denmark)

    Specht, K.; Leonhardt, Jane Schwartz; Revald, Peter; Mandoe, H.; Andresen, E.B.; Brodersen, J.; Kreiner, S.; Kjaersgaard-Andersen, P.

    2011-01-01

    BACKGROUND AND PURPOSE: Postoperative analgesia after primary total hip arthroplasty (THA) using opioids is associated with troublesome side effects such as nausea and dizziness, and epidural analgesic means delayed mobilization. Thus, local infiltration analgesia (LIA) during surgery prolonged...

  15. The prognostic value of PCA3, the fusion gene TMPRSS2:ERG and other markers in prostate cancer

    OpenAIRE

    HOLÁ, Hana

    2014-01-01

    The aim of this thesis was to assess the presence of fusion gene TMPRSS2:ERG and expressions of PCA3, miR23b, miR26 and miR221 in PCa. PSA was measured in peripheral blood and tumor tissue (FFPE samples). The presence of fusion gene TMPRSS2:ERG and expression of PCA3 gene and miRNA in FFPE tumor tissue was analysed by RT real-time PCR. This determination would help to identify patients with high-risk tumors.

  16. Role of propacetamol in multimodal analgesia after lumbar spine surgery%丙帕他莫在腰椎术后多模式镇痛中的应用

    Institute of Scientific and Technical Information of China (English)

    陈志峰; 姜虹; 李嫒嫒

    2011-01-01

    Objective To assess the analgesic effects of propacetamol with fentanyl after lumbar spine surgery. Methods Sixty patients undergoing lumbar spine surgery were randomly divided into two groups, with 30 patients in each group. Patients in group I were treated with 2 g propacetamol IS min before the end of operation, and were managed with self-controlled analgesia ( PCA) pump with fentanyl after operation. Patients in group II were just given PCA pump with fentanyl after operation. PCA pumps were composed of fentanyl with 0.4 u,g ? Kg"1 ? H"', and were used for 48 h. The time of extubation after operation and the analgesia scores, sedation scores, respiration, circulation, vomiting at different time points within 48 h after operation in two groups were recorded. Results There was no significant difference in the time of extubation, and sedation scores, respiration, mean arterial pressure, heart rates and vomiting at different time points after operation between two groups (F>0.05). The analgesia scores in group I were superior to those in group II at the time points of 30 min, 1 h, 2 h, 4 h, 6 h and 12 h after operation (P 0. 05). Conclusion The analgesic effect of propacetamol with fentanyl after surgery is safe and effective.%目的 观察丙帕他莫复合芬太尼对腰椎术后镇痛的应用效果.方法 60例接受腰椎手术患者随机分成2组,每组30例.Ⅰ组手术结束前15 min给予丙帕他莫2 g,术后予芬太尼患者自控镇痛(PCA)泵静脉镇痛,Ⅱ组术后给予芬太尼PCA泵静脉镇痛.两组泵中芬太尼都按0.4 μg.kg-1·h-1配置,使用48 h.观察两组患者术后拔除气管导管时间,术后48 h内各时间点的镇痛镇静评分、呼吸循环指标以及术后呕吐发生情况.结果 两组患者术后拔管时间、术后各时间点镇静评分、呼吸频率、平均动脉压、心率及呕吐发生率比较差异均无统计学意义(P>0.05).术后30 min和1、2、4、6及12h时间点,Ⅰ

  17. Comparison of tapentadol with tramadol for analgesia after cardiac surgery

    Directory of Open Access Journals (Sweden)

    Srinivas Kalyanaraman Iyer

    2015-01-01

    Full Text Available Background: Tapentadol is a relatively new analgesic. We decided to compare it with tramadol for their various effects after cardiac surgery. Setting: A study in a tertiary care hospital. Materials and Methods: Sixty adults undergoing cardiac surgery were divided into 2 groups of 30 each by computerized random allotment (Group X = tapentadol 50 mg oral and Group Y = tramadol 100 mg oral. Informed Consent and Institutional Ethics Committee approval were obtained. The patients were given either drug X or drug Y after extubation in this single blinded study, wherein the data collectors and analyzers were blinded to the study. All patients received oral paracetamol qds and either drug X or drug Y tds. The pain score was noted on a Visual Analog Scale before each drug dose, 3 h later and on coughing. Heart rate, respiratory rate, and blood pressure were recorded before the drug dose and 3 h later. Postoperative nausea or vomiting (PONV, temperature, and modified Glasgow Coma Scale readings were recorded. The above readings were obtained for 6 doses (up to 48 h after extubation. Statistics: t-test, Pearson Chi-square test, Fisher exact test, and Mantel-Haenszel test were used for statistics. Results: Tapentadol group patients had significantly better analgesia 3 h after the drug and "on coughing" than tramadol group. The difference in their effects on blood creatinine levels, temperature, hemodynamics, oxygen saturation, and respiratory rate were not clinically significant. Tapentadol produced lesser drowsiness and lesser vomiting than tramadol. Conclusions: Tapentadol, due to its norepinephrine reuptake inhibition properties, in addition to mu agonist, is a better analgesic than tramadol and has lesser PONV.

  18. Effects of regional analgesia on stress responses to pediatric surgery.

    Science.gov (United States)

    Wolf, Andrew R

    2012-01-01

    Invasive surgery induces a combination of local response to tissue injury and generalized activation of systemic metabolic and hormonal pathways via afferent nerve pathways and the central nervous system. The local inflammatory responses and the parallel neurohumoral responses are not isolated but linked through complex signaling networks, some of which remain poorly understood. The magnitude of the response is broadly related to the site of injury (greater in regions with visceral pain afferents such as abdomen and thorax) and the extent of the trauma. The changes include alterations in metabolic, hormonal, inflammatory, and immune systems that can be collectively termed the stress response. Integral to the stress responses are the effects of nociceptive afferent stimuli on systemic and pulmonary vascular resistance, heart rate, and blood pressure, which are a combination of efferent autonomic response and catecholamine release via the adrenal medulla. Therefore, pain responses, cardiovascular responses, and stress responses need to be considered as different aspects of a combined bodily reaction to surgery and trauma. It is important at the outset to understand that not all components of the stress response are suppressed together and that this is important when discussing different analgesic modalities (i.e. opioids vs regional anesthesia). For example, in terms of the use of fentanyl in the infant, the dose required to provide analgesia (1-5 mcg·kg(-1)) is less than that required for hemodynamic stability in response to stimuli (5-10 mcg·kg(-1)) (1) and that this in turn is less than that required to suppress most aspects of the stress response (25-50 mcg·kg(-1)) (2). In contrast to this considerable dose dependency, central local anesthetic blocks allow blockade of the afferent and efferent sympathetic pathways at relatively low doses resulting in profound suppression of hemodynamic and stress responses to surgery. PMID:21999144

  19. Endogenous opiate analgesia induced by tonic immobility in guinea pigs

    Directory of Open Access Journals (Sweden)

    C.R.A. Leite-Panissi

    2001-02-01

    Full Text Available A function of the endogenous analgesic system is to prevent recuperative behaviors generated by tissue damage, thus preventing the emission of species-specific defensive behaviors. Activation of intrinsic nociception is fundamental for the maintenance of the behavioral strategy adopted. Tonic immobility (TI is an inborn defensive behavior characterized by a temporary state of profound and reversible motor inhibition elicited by some forms of physical restraint. We studied the effect of TI behavior on nociception produced by the formalin and hot-plate tests in guinea pigs. The induction of TI produced a significant decrease in the number of flinches (18 ± 6 and 2 ± 1 in phases 1 and 2 and lickings (6 ± 2 and 1 ± 1 in phases 1 and 2 in the formalin test when compared with control (75 ± 13 and 22 ± 6 flinches in phases 1 and 2; 28 ± 7 and 17 ± 7 lickings in phases 1 and 2. In the hot-plate test our results also showed antinociceptive effects of TI, with an increase in the index of analgesia 30 and 45 min after the induction of TI (0.67 ± 0.1 and 0.53 ± 0.13, respectively when compared with control (-0.10 ± 0.08 at 30 min and -0.09 ± 0.09 at 45 min. These effects were reversed by pretreatment with naloxone (1 mg/kg, ip, suggesting that the hypoalgesia observed after induction of TI behavior, as evaluated by the algesimetric formalin and hot-plate tests, is due to activation of endogenous analgesic mechanisms involving opioid synapses.

  20. Local infiltration analgesia in urogenital prolapse surgery: a prospective randomized, double-blind, placebo-controlled study

    DEFF Research Database (Denmark)

    Kristensen, Billy B; Rasmussen, Yvonne H; Agerlin, Marianne;

    2011-01-01

    To evaluate the analgesic effect of high-volume infiltration analgesia in urogenital prolapse surgery and provide a detailed description of the infiltration technique.......To evaluate the analgesic effect of high-volume infiltration analgesia in urogenital prolapse surgery and provide a detailed description of the infiltration technique....

  1. Intrathecal Sufentanil along with Bupivacaine Prolongs Postoperative Analgesia as Compared to Fentanyl with Bupivacaine: A Randomized Trial

    Directory of Open Access Journals (Sweden)

    Birva N Khara

    2013-06-01

    Conclusion: We conclude that intrathecal fentanyl(25 microgram and sufentanil (6 microgram with bupivacaine heavy prolong postoperative analgesia without respiratory depression or other serious adverse effects .This prolonged analgesia is more marked with sufentanil than fentanyl. [Natl J Med Res 2013; 3(3.000: 229-232

  2. Transición analgésica tras anestesia basada en remifentanilo en cirugía abdominal mayor: morfina-ketorolaco versus analgesia epidural Analgesic transition after remifentanyl-based anaesthesia in major abdominal surgery: morphine-ketorolac versus epidural analgesia

    Directory of Open Access Journals (Sweden)

    E. Calderón

    2004-02-01

    Full Text Available Objetivos: El objetivo de nuestro estudio ha sido comparar la eficacia analgésica y efectos adversos de dos modalidades analgésicas, epidural con bupivacaína-fentanilo e intravenosa con morfina-ketorolaco en la transición de una anestesia basada en remifentanilo tras cirugía abdominal mayor durante las primeras 6 horas del periodo postoperatorio. Material y métodos: Hemos realizado un estudio clínico en 30 pacientes adultos, programados para cirugía abdominal mayor. Todos los pacientes recibieron una técnica anestésica estándar. Cuarenta minutos antes de finalizar la intervención quirúrgica, a los pacientes del grupo E se le administró 15 ml de bupivacaína 0,25% y 1 µg.kg-1 de fentanilo vía epidural, y a los pacientes del grupo M se les administró por vía intravenosa 0,15 mg.kg-1 de cloruro mórfico y 30 mg de ketorolaco. Hemos valorado durante las primeras 6 horas postextubación, los parámetros hemodinámicos, respiratorios, grado de sedación y recuperación postanestésica, y tiempo en el que eran elegibles para ser dado de alta de la reanimación, la intensidad del dolor postoperatorio mediante escala verbal simple y escala analógica visual, los efectos adversos y las necesidades de analgesia de rescate. Como analgésico de rescate se utilizó morfina a dosis de 0,05 mg.kg-1 en el grupo M y bolo epidural de 5 ml de bupivacaína 0,25% en el grupo E cuando entre determinaciones la intensidad del dolor en la EVS ≥ 2. Resultados: No hemos encontrado diferencias estadísticamente significativas en las características generales, parámetros hemodinámicos, respiratorios, nivel de sedación, grado de recuperación y elección para el alta entre ambos grupos de estudio. Las necesidades de rescate fueron significativamente mayores en el grupo M (40% que en el grupo E (13% (p Objectives: The aim of our study was to compare analgesic effectiveness and side effects of two analgesic regimes: epidural analgesia with bupivacaine

  3. Analgesic efficacy of lidocaine and multimodal analgesia for chest tube removal: A randomized trial study1

    Science.gov (United States)

    Pinheiro, Valdecy Ferreira de Oliveira; da Costa, José Madson Vidal; Cascudo, Marcelo Matos; Pinheiro, Ênio de Oliveira; Fernandes, Maria Angela Ferreira; de Araujo, Ivonete Batista

    2015-01-01

    Objective: to assess the analgesic efficacy of subcutaneous lidocaine and multimodal analgesia for chest tube removal following heart surgery. Methods: sixty volunteers were randomly allocated in two groups; 30 participants in the experimental group were given 1% subcutaneous lidocaine, and 30 controls were given a multimodal analgesia regime comprising systemic anti-inflammatory agents and opioids. The intensity and quality of pain and trait and state anxiety were assessed. The association between independent variables and final outcome was assessed by means of the Chi-squared test with Yates' correction and Fisher's exact test. Results: the groups did not exhibit significant difference with respect to the intensity of pain upon chest tube removal (p= 0.47). The most frequent descriptors of pain reported by the participants were pressing, sharp, pricking, burning and unbearable. Conclusion: the present study suggests that the analgesic effect of the subcutaneous administration of 1% lidocaine combined with multimodal analgesia is most efficacious. PMID:26625989

  4. EFFECT OF DIFFE RENT CONCENTRATIONS OF EPIDURAL D E XMEDITOMIDINE FOR POST - OPERATIVE ANALGESIA

    Directory of Open Access Journals (Sweden)

    Varaprasad

    2015-09-01

    Full Text Available BACKGROUND: The aim of our study was to know the ideal epidural dose to achieve analgesia in the postoperative patients using different concentrations of epidural dexmeditomidine. METHODS AND MATERIAL S : Ninety patients of either sex, with age ran ging from 25 years to 60 years were randomly selected and divided into three groups of thirty each. Group A received epidural 0.25% bupivacaine along with 25mcg of dexmeditomidine, Group B received epidural 0.25% bupivacaine along with 50mcg dexmeditomidin e and Group C received epidural 0.25 % bupivacaine along with 75 mcg dexmeditomidine. The duration of analgesia, sedation and cardiovascular stability were studied. RESULTS: Analgesia and sedation was more in Group C than the other two groups. Cardiovascula r stability was good in groups A and B.

  5. Understanding Central Mechanisms of Acupuncture Analgesia Using Dynamic Quantitative Sensory Testing: A Review

    Directory of Open Access Journals (Sweden)

    Jiang-Ti Kong

    2013-01-01

    Full Text Available We discuss the emerging translational tools for the study of acupuncture analgesia with a focus on psychophysical methods. The gap between animal mechanistic studies and human clinical trials of acupuncture analgesia calls for effective translational tools that bridge neurophysiological data with meaningful clinical outcomes. Temporal summation (TS and conditioned pain modulation (CPM are two promising tools yet to be widely utilized. These psychophysical measures capture the state of the ascending facilitation and the descending inhibition of nociceptive transmission, respectively. We review the basic concepts and current methodologies underlying these measures in clinical pain research, and illustrate their application to research on acupuncture analgesia. Finally, we highlight the strengths and limitations of these research methods and make recommendations on future directions. The appropriate addition of TS and CPM to our current research armamentarium will facilitate our efforts to elucidate the central analgesic mechanisms of acupuncture in clinical populations.

  6. The study of patient controlled analgesia undergoing interventional therapy for gynecology and obstetrics ailment

    International Nuclear Information System (INIS)

    Uterine artery embolism is widely used for interventional therapy of gynecology and obstetrics ailment, but immediate incidence of pain occurs in 90% to 100% after uterine artery embolism and postoperative incidence of pain takes place from 80% to 90%. Patient controlled epidural analgesia (PCEA) could be adopted to treat pain with obviously outweighed effects over the traditional drug regimen or patient intravenous analgesia during the period of interventional therapy of uterine artery embolization. PCEA possesses good effect of analgesia and less adverse reaction and furthermore could eliminate or lessen the sufferings of patient and thus improve rehabilitation quality. Adding droperidol (0.005%) into the preparation of PCEA could decrease adverse effect incidence of nausea and vomiting; so it deserves recommendation for extending application in clinical interventional therapy. (authors)

  7. Influência da frequência estimulatória envolvida nos efeitos analgésicos induzidos por eletroacupuntura em cervicalgia tensional Influence of the stimulating frequency involved in analgesic effects induced by electroacupuncture for neck pain due to muscular tension

    OpenAIRE

    Nohama, P.; SM Silvério-Lopes

    2009-01-01

    OBJETIVO: Avaliar a influência da frequência estimulatória envolvida na analgesia induzida por eletroacupuntura em cervicalgia. MÉTODOS: Comparou-se o desempenho da analgesia produzida em 2Hz, 100Hz, 1000Hz, 2500Hz e um grupo só com acupuntura, sem estímulo elétrico, avaliado por meio de algometria de pressão, Escala Visual Analógica (EVA) e frequência cardíaca. Utilizou-se um estimulador elétrico microprocessado, com forma de pulso em padrão pulsado, monofásico, retangular, balanceado assimé...

  8. Continuous Femoral Nerve Block versus Intravenous Patient Controlled Analgesia for Knee Mobility and Long-Term Pain in Patients Receiving Total Knee Replacement: A Randomized Controlled Trial

    OpenAIRE

    Lihua Peng; Li Ren; Peipei Qin; Jing Chen; Ping Feng; Haidan Lin; Min Su

    2014-01-01

    Objectives. To evaluate the comparative analgesia effectiveness and safety of postoperative continuous femoral nerve block (CFNB) with patient controlled intravenous analgesia (PCIA) and their impact on knee function and chronic postoperative pain. Methods. Participants were randomly allocated to receive postoperative continuous femoral nerve block (group CFNB) or intravenous patient controlled analgesia (group PCIA). Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) scor...

  9. Inhibiting spinal neuron-astrocytic activation correlates with synergistic analgesia of dexmedetomidine and ropivacaine.

    Directory of Open Access Journals (Sweden)

    Huang-Hui Wu

    Full Text Available BACKGROUND: This study aims to identify that intrathecal (i.t. injection of dexmedetomidine (Dex and ropivacaine (Ropi induces synergistic analgesia on chronic inflammatory pain and is accompanied with corresponding "neuron-astrocytic" alterations. METHODS: Male, adult Sprague-Dawley rats were randomly divided into sham, control and i.t. medication groups. The analgesia profiles of i.t. Dex, Ropi, and their combination detected by Hargreaves heat test were investigated on the subcutaneous (s.c. injection of complete Freund adjuvant (CFA induced chronic pain in rat and their synergistic analgesia was confirmed by using isobolographic analysis. During consecutive daily administration, pain behavior was daily recorded, and immunohistochemical staining was applied to investigate the number of Fos-immunoreactive (Fos-ir neurons on hour 2 and day 1, 3 and 7, and the expression of glial fibrillary acidic protein (GFAP within the spinal dorsal horn (SDH on day 1, 3, 5 and 7 after s.c. injection of CFA, respectively, and then Western blot to examine spinal GFAP and β-actin levels on day 3 and 7. RESULTS: i.t. Dex or Ropi displayed a short-term analgesia in a dose-dependent manner, and consecutive daily administrations of their combination showed synergistic analgesia and remarkably down-regulated neuronal and astrocytic activations indicated by decreases in the number of Fos-ir neurons and the GFAP expression within the SDH, respectively. CONCLUSION: i.t. co-delivery of Dex and Ropi shows synergistic analgesia on the chronic inflammatory pain, in which spinal "neuron-astrocytic activation" mechanism may play an important role.

  10. Optimal single-dose epidural neostigmine for postoperative analgesia after partial hepatectomy

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    Qiao Sheng Zhong

    2014-01-01

    Full Text Available Objective: Neostigmine can produce analgesia by acting on the spinal cord. This study was to determine the optimal single-dose of epidural neostigmine for postoperative analgesia after partial hepatectomy. Patients and Methods: Twenty-six patients undergoing elective partial hepatectomy under general anesthesia combined with epidural block were studied. The dose of epidural neostigmine was determined using Dixon′s up-and-down method, starting from neostigmine 100 μg with an interval of 25 μg. Thirty minutes after skin incision, a predetermined dose of neostigmine was injected via the epidural catheter. Each patient received 0.125% bupivacaine and fentanyl 2 μg/ml for patient controlled epidural analgesia (PCEA after the operation. Assessment of analgesia quality was performed at 8 h and 24 h after the operation. Results : The ED 50 of epidural neostigmine in combination with PCEA for satisfactory analgesia was 226.78 ± 33.20 μg. Probit analysis showed that the ED 50 and ED 95 of epidural neostigmine were 228.63 μg (95% CI = 197.95-299.77 μg and 300.12 μg (95% CI = 259.44-741.65 μg, respectively. Conclusion: The ED 50 and ED 95 of epidural neostigmine in combination with PCEA for satisfactory analgesia after partial hepatectomy were 228.63 μg (95% CI = 197.95-299.77 μg and 300.12 μg (95% CI = 259.44-741.65 μg.

  11. Evaluation of significant sources influencing the variation of water quality of Kandla creek, Gulf of Katchchh, using PCA

    Digital Repository Service at National Institute of Oceanography (India)

    Dalal, S.G.; Shirodkar, P.V.; Jagtap, T.G.; Naik, B.G.; Rao, G.S.

    To evaluate the significant sources contributing to water quality parameters, we used principal component analysis (PCA) for the interpretation of a large complex data matrix obtained from the Kandla creek environmental monitoring program. The data...

  12. Separation of cardiac and respiratory components from the electrical bio-impedance signal using PCA and fast ICA

    CERN Document Server

    Mughal, Yar M; Annus, P

    2013-01-01

    This paper is an attempt to separate cardiac and respiratory signals from an electrical bio-impedance (EBI) dataset. For this two well-known algorithms, namely Principal Component Analysis (PCA) and Independent Component Analysis (ICA), were used to accomplish the task. The ability of the PCA and the ICA methods first reduces the dimension and attempt to separate the useful components of the EBI, the cardiac and respiratory ones accordingly. It was investigated with an assumption, that no motion artefacts are present. To carry out this procedure the two channel complex EBI measurements were provided using classical Kelvin type four electrode configurations for the each complex channel. Thus four real signals were used as inputs for the PCA and fast ICA. The results showed, that neither PCA nor ICA nor combination of them can not accurately separate the components at least are used only two complex (four real valued) input components.

  13. Analgesia profunda con acupuntura / Deep analgesic with acupuncture

    OpenAIRE

    Villate Numa, María Fernanda

    2010-01-01

    El alivio del dolor por medio de la acupuntura se desarrollo en la China moderna después de 1945 con la influencia inicial de la medicina occidental. Según la teoría tradicional, la acupuntura es eficaz sólo cuando las agujas producen el fenómeno “De Qi”, descrito como una sensación ligeramente dolorosa, relajante y si los dedos del acupuntor notan que las agujas son aspiradas por el punto tratado. En el Occidente diferentes estudios han demostrado que la acupuntura estimula fibras aferentes ...

  14. Stabilogram mPCA Decomposition and Effects Analysis of Several Entries on The Postural Stability

    Directory of Open Access Journals (Sweden)

    Régis FOURNIER

    2012-06-01

    Full Text Available This paper presents an analysis of stabilogram using the modified Principal Component Analysis (mPCA decomposition which will be employed to highlight the effects of different aspects on the human postural stability.The aim of this study is to analyze stabilogram center of pressure time series using the mPCA decomposition method. The mPCA is a decomposition method applied to a complex signal. It decomposes the stabilogram, considered as an additive model, into three components: trend, rambling and trembling. The study of the trace of analytic trembling (respectively of rambling in the complex plan highlights a unique rotation center. So the phase is defined and two parameters are extracted: the area of the circle in which 95% of the trace’s data points are located and the angular frequency. In this study 25 healthy volunteers (average age 31± 11 years are required to stand upright on an electromagnetic platform either with eyes closed or open and with feet outspread or tighten.Experimental results show the efficiency of the parameter area to identify the effect of visual, proprioceptive and directional entries on the postural stability. These results are able to discriminate between control and young groups and indicate a less well-controlled posture for control subjects (34.5± 7.5y relatively to young subjects (22.5 ±2. 5y. Results serve also to display that female subjects are more stable than males, that fat subjects are more stable than thin and that tall subjects are more stable than small.

  15. Degradation of malathion by Pseudomonas during activated sludge treatment system using principal component analysis (PCA).

    Science.gov (United States)

    Imran, Hashmi; Altaf, Khan M; Jong-Guk, Kim

    2006-01-01

    Popular descriptive multivariate statistical method currently employed is the principal component analyses (PCA) method. PCA is used to develop linear combinations that successively maximize the total variance of a sample where there is no known group structure. This study aimed at demonstrating the performance evaluation of pilot activated sludge treatment system by inoculating a strain of Pseudomonas capable of degrading malathion which was isolated by enrichment technique. An intensive analytical program was followed for evaluating the efficiency of biosimulator by maintaining the dissolved oxygen (DO) concentration at 4.0 mg/L. Analyses by high performance liquid chromatographic technique revealed that 90% of malathion removal was achieved within 29 h of treatment whereas COD got reduced considerably during the treatment process and mean removal efficiency was found to be 78%. The mean pH values increased gradually during the treatment process ranging from 7.36-8.54. Similarly the mean ammonia-nitrogen (NH3-N) values were found to be fluctuating between 19.425-28.488 mg/L, mean nitrite-nitrogen (NO3-N) ranging between 1.301-2.940 mg/L and mean nitrate-nitrogen (NO3-N) ranging between 0.0071-0.0711 mg/L. The study revealed that inoculation of bacterial culture under laboratory conditions could be used in bioremediation of environmental pollution caused by xenobiotics. The PCA analyses showed that pH, COD, organic load and total malathion concentration were highly correlated and emerged as the variables controlling the first component, whereas dissolved oxygen, NO3-N and NH3-N governed the second component. The third component repeated the trend exhibited by the first two components. PMID:17078564

  16. The Turbulence Spectrum of Molecular Clouds in the Galactic Ring Survey: A Density-Dependent PCA Calibration

    OpenAIRE

    Roman-Duval, Julia; Federrath, Christoph; Brunt, Christopher; Heyer, Mark; Jackson, James; Klessen, Ralf

    2011-01-01

    Turbulence plays a major role in the formation and evolution of molecular clouds. The problem is that turbulent velocities are convolved with the density of an observed region. To correct for this convolution, we investigate the relation between the turbulence spectrum of model clouds, and the statistics of their synthetic observations obtained from Principal Component Analysis (PCA). We apply PCA to spectral maps generated from simulated density and velocity fields, obtained from hydrodynami...

  17. Separation of cardiac and respiratory components from the electrical bio-impedance signal using PCA and fast ICA

    OpenAIRE

    Mughal, Yar M.; Krivoshei, A.; Annus, P.

    2013-01-01

    This paper is an attempt to separate cardiac and respiratory signals from an electrical bio-impedance (EBI) dataset. For this two well-known algorithms, namely Principal Component Analysis (PCA) and Independent Component Analysis (ICA), were used to accomplish the task. The ability of the PCA and the ICA methods first reduces the dimension and attempt to separate the useful components of the EBI, the cardiac and respiratory ones accordingly. It was investigated with an assumption, that no mot...

  18. Do antenatal education classes decrease use of epidural analgesia during labour? – a Danish RCT

    DEFF Research Database (Denmark)

    Brixval, Carina Sjöberg; Thygesen, Lau Caspar; Axelsen, Solveig Forberg;

    reduce fear during birth which in turn may decrease use of pain relief. Few randomised trials have examined the effect of attending antenatal education in small groups on use of epidural analgesia and among these conclusions are conflicting. The objective of this study was therefore to examine the effect...... of an antenatal education program in small classes on use of epidural analgesia. Methods: Data from the NEWBORN trial were used. A total of 1766 women from the Copenhagen area, Denmark were randomized to participate in either antenatal education in small groups or standard care. Data were analysed...

  19. Sedation and Analgesia in Children with Developmental Disabilities and Neurologic Disorders

    Directory of Open Access Journals (Sweden)

    Todd J. Kilbaugh

    2010-01-01

    Full Text Available Sedation and analgesia performed by the pediatrician and pediatric subspecialists are becoming increasingly common for diagnostic and therapeutic purposes in children with developmental disabilities and neurologic disorders (autism, epilepsy, stroke, obstructive hydrocephalus, traumatic brain injury, intracranial hemorrhage, and hypoxic-ischemic encephalopathy. The overall objectives of this paper are (1 to provide an overview on recent studies that highlight the increased risk for respiratory complications following sedation and analgesia in children with developmental disabilities and neurologic disorders, (2 to provide a better understanding of sedatives and analgesic medications which are commonly used in children with developmental disabilities and neurologic disorders on the central nervous system.

  20. Analgesia quirúrgica acupuntural:estudio de la efectividad de dos técnicas

    OpenAIRE

    Pagola Bérger, Victor Valentín

    2008-01-01

    Se presenta el estudio de la efectividad de la aplicación de la acupuntura a la realización de operaciones de cirugía mayor durante 14 años en Villa Clara. Se exponen los resultados de 2582 operados con Analgesia Quirúrgica Acupuntural clásica y 236 intervenciones previa Implantación de Catgut. Para la evaluación de la efectividad de la primera, realizada entre 1992 y 2006, se definieron como resultados esperados: la analgesia transoperatoria, calificada de Bien en el 94% de los operados y la...

  1. [Analgesia in therapeutic dentistry: methodological and topographical aspects of the workshop

    Directory of Open Access Journals (Sweden)

    Dmitrieva E.A.

    2015-09-01

    Full Text Available The article presents the main methodological aspects of practical training at the training on «Analgesia in therapeutic dentistry». Attention is focused on the matters of classification methods and types of anesthesia of pathological processes of maxillofacial region and their advantages and disadvantages, indications and contraindications for anesthesia for therapeutic interventions on questions of select the most effective anesthetic injection systems and technology of injection itself. Citation: Dmitrieva EA. [Analgesia in therapeutic dentistry: methodological and topographical aspects of the workshop]. Morphologia. 2015;9(3:130-4. Russian.

  2. PMSVM: An Optimized Support Vector Machine Classification Algorithm Based on PCA and Multilevel Grid Search Methods

    Directory of Open Access Journals (Sweden)

    Yukai Yao

    2015-01-01

    Full Text Available We propose an optimized Support Vector Machine classifier, named PMSVM, in which System Normalization, PCA, and Multilevel Grid Search methods are comprehensively considered for data preprocessing and parameters optimization, respectively. The main goals of this study are to improve the classification efficiency and accuracy of SVM. Sensitivity, Specificity, Precision, and ROC curve, and so forth, are adopted to appraise the performances of PMSVM. Experimental results show that PMSVM has relatively better accuracy and remarkable higher efficiency compared with traditional SVM algorithms.

  3. Fast and Reliable PCA-Based Temporal Segmentation of Video Sequences

    Czech Academy of Sciences Publication Activity Database

    Filip, Jiří; Haindl, Michal

    Los Alamitos: IEEE Press, 2008, s. 1-4. ISBN 978-1-4244-2174-9. [19th International Conference on Pattern Recognition. Tampa (US), 07.12.2008-11.12.2008] R&D Projects: GA AV ČR 1ET400750407; GA ČR GA102/08/0593 Grant ostatní: GA MŠk(CZ) 2C06019; Commision EU(XE) 41358 Institutional research plan: CEZ:AV0Z10750506 Keywords : video segmentation Subject RIV: BD - Theory of Information http://library.utia.cas.cz/separaty/2008/RO/filip-fast and reliable pca-based temporal segmentation of video sequences.pdf

  4. Convergence analysis of Chauvin's PCA learning algorithm with a constant learning rate

    International Nuclear Information System (INIS)

    The convergence of Chauvin's PCA learning algorithm with a constant learning rate is studied in this paper by using a DDT method (deterministic discrete-time system method). Different from the DCT method (deterministic continuous-time system method), the DDT method does not require that the learning rate converges to zero. An invariant set of Chauvin's algorithm with a constant learning rate is obtained so that the non-divergence of this algorithm can be guaranteed. Rigorous mathematic proofs are provided to prove the local convergence of this algorithm

  5. Sparse PCA corrects for cell type heterogeneity in epigenome-wide association studies.

    Science.gov (United States)

    Rahmani, Elior; Zaitlen, Noah; Baran, Yael; Eng, Celeste; Hu, Donglei; Galanter, Joshua; Oh, Sam; Burchard, Esteban G; Eskin, Eleazar; Zou, James; Halperin, Eran

    2016-05-01

    In epigenome-wide association studies (EWAS), different methylation profiles of distinct cell types may lead to false discoveries. We introduce ReFACTor, a method based on principal component analysis (PCA) and designed for the correction of cell type heterogeneity in EWAS. ReFACTor does not require knowledge of cell counts, and it provides improved estimates of cell type composition, resulting in improved power and control for false positives in EWAS. Corresponding software is available at http://www.cs.tau.ac.il/~heran/cozygene/software/refactor.html. PMID:27018579

  6. ERROR PROTECTION OF PCA BASED FACE RECOGNITION FOR TRANSMISSION OVER NOISY CHANNELS

    Directory of Open Access Journals (Sweden)

    Gholamreza ANBARJAFARI

    2013-01-01

    Full Text Available In this paper, we have proposed a system for reliable communication of coded grayscale facial images over noisy channels. Principle Component Analysis (PCA is used for face dimensional reduction and face recognition and Repeated Bit Representation (RBR is proposed to code the eigenfaces for mobile communication applications. Recognition obtained with RBR system approach reaches to %82 for 80 test images (2 poses per person and 320 training images (8 poses per person of ORL, by considering only the most important 30 coefficients of principle components in a noisy channel with SNR=-2dB.

  7. Application of PCA-SDG Based Multiple Fault Diagnosis%PCA-SDG在TEP多源故障诊断中的应用

    Institute of Scientific and Technical Information of China (English)

    田娟; 谢刚; 王培鑫

    2012-01-01

    针对传统基于SDG(符号有向图)的故障诊断方法对每个变量节点状态和高低阈值难以确定,且对各个变量单独统计,不考虑变量间相互关系的缺点,提出一种PCA(主元分析)与SDG相结合的故障诊断方法,并将其用于多源故障诊断中.将PCA得到的出现故障征兆的变量在SDG模型上进行反向推理,找到故障源.通过TEP仿真实验验证,表明该方法能够及时有效地检测出单个或多个故障,提高了诊断的准确性与分辨率.

  8. Bloqueio pleural bilateral: analgesia e funções pulmonares em pós-operatório de laparotomias medianas Bloqueo pleural bilateral: analgesia y funciones pulmonares en pós-operatorio de laparotomias medianas Bilateral pleural block: analgesia and pulmonary functions in postoperative of median laparotomies

    Directory of Open Access Journals (Sweden)

    Karl Otto Geier

    2004-08-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: Não obstante o bloqueio pleural ter sido convertido quase numa panacéia analgésica, resultados contraditórios foram publicados. O objetivo deste estudo foi observar o desempenho analgésico e espirométrico das funções pulmonares no pós-operatório imediato de 21 pacientes com o bloqueio pleural bilateral em laparotomias medianas de urgência. MÉTODO: Bloqueio pleural bilateral foi realizado em decúbito dorsal horizontal em 21 pacientes com 20 ml de bupivacaína a 0,375% com adrenalina a 1:400.000 administrados por cateter em cada hemitórax durante o pós-operatório imediato. Soluções aleatórias de bupivacaína e de solução fisiológica foram administradas por residentes ou enfermeiras que desconheciam o conteúdo das seringas, e seus desfechos analgésicos avaliados de acordo com a escala de dor Prince Henry ao comparar os valores pré e pós-bloqueio pleural bilateral. Em função da dor pós-operatória, testes espirométricos das funções pulmonares também foram determinados mediante espirômetro portátil. RESULTADOS: Analgesia pós-operatória, com duração média de 247,75 ± 75 minutos foi constatada em todos os pacientes com a bupivacaína, embora tenha persistido dor residual de menor intensidade na região suprapúbica em cinco pacientes (8% e em dois pacientes na apófise xifóide (3,2%. Nenhum efeito analgésico foi obtido com solução fisiológica. Face à dor pós-operatória, as funções pulmonares, avaliadas antes e após os bloqueios, registraram melhora com a bupivacaína na CVF (p JUSTIFICATIVA Y OBJETIVOS: No obstante el bloqueo pleural haber sido convertido casi en una panacea analgésica, fueron publicados resultados contradictorios. El objetivo de este estudio fue observar el desempeño analgésico y espirométrico de las funciones pulmonares en el pós-operatorio inmediato de 21 pacientes con el bloqueo pleural bilateral en laparotomias medianas de urgencia. M

  9. A comparative study of oral tapentadol with thoracic epidural analgesia versus intravenous tramadol and paracetamol combination for postoperative analgesia in off pump CABG

    OpenAIRE

    Shah, Himanshu A; Jaishree S. B.; Mrugank Bhavsar

    2013-01-01

    Background: Accurate management of post operative pain is quite impossible with single drug therapy approach. For this, our aim was to combine use of tapentadol tablet orally along with thoracic epidural in comparison with intravenous combined use of tramadol, paracetamol and diclofenac for postoperative analgesia in case CABG patients. Methods: 60 patients of CABG (Coronary Artery Bypass Surgery) randomly and equally divided into two groups. Group TTE (Tab. Tapentadol -Thoracic Epidural, ...

  10. Analgesia in patients with acute abdomen: does danger persist? Analgesia en el paciente con abdomen agudo: ¿persiste el peligro?

    OpenAIRE

    Juan Camilo Correa Gallego; Edward Alexander Blandón Castaño

    2006-01-01

    INTRODUCTION: Acute abdominal pain is a very frequent cause of medical consultation. Early analgesia is not usually given to patients that present with it as their chief complaint, because of the many differential diagnoses that must be taken into consideration and also because of fear of the potential complications that may ensue if an early and accurate diagnosis is not made. Nowadays medical practice is evolving and it is pertinent to ask and answer whether it is still adequate to keep the...

  11. Maternal Expectations and Experiences of Labor Analgesia With Nitrous Oxide

    Science.gov (United States)

    Pasha, Hajar; Basirat, Zahra; Hajahmadi, Mahmood; Bakhtiari, Afsaneh; Faramarzi, Mahbobeh; Salmalian, Hajar

    2012-01-01

    Background Although there are various methods for painless delivery such as using entonox gas, most of the people are unfamiliar or concerned about it yet. Objectives The purpose of this study was to assess maternal expectations and experience of labor analgesia with nitrous oxide. Patients and Methods In a clinical trial study, 98 pregnant women in active phase of delivery were studied randomly in two groups (intervention group = 49, control group = 49) after obtaining written consent. Efficacy, experience satisfaction, and also expectation of pregnant women about entonox gas in two groups were compared, likewise in intervention group before and after using entonox gas. Results Most of the pregnant women receiving entonox gas had less labor pain (91.8%), and were satisfied with it (98%). The severity of pain in the most of entonox user was moderate level (46.94%), while for the control group it was severe (55.10%) which was significant, 40.82% of the mother in entonox group had a severe pain and 10.20% had a very severe pain, whereas in the control group (55.10%) of the mother had a severe pain and 26.53% of the had very severe pain (P = 0.004). efficacy of labor pain was in moderate level in most cases. 49% of pregnant women receiving gas described their experience as a good and excellent. 80.9% indicated that they will request the mentioned painless method in the future. The amount of suffering from gas side effects was mild in most patients of intervention group (63%). Expectations of the majority of pregnant women in intervention group (before receiving gas) and control group for painless delivery were weak (65.3%, 40.9%). The percentage of positive expectations had increased after receiving entonox gas (P = 0.01). There was a difference between the expectations of intervention group receiving entonox gas and control group (P = 0.001). Positive expectations were more in intervention group than the control group. Most differences of expectations in intervention

  12. pcaH, a molecular marker for estimating the diversity of the protocatechuate-degrading bacterial community in the soil environment

    DEFF Research Database (Denmark)

    El Azhari, Najoi

    2007-01-01

    cloned from two agricultural soils. Restriction fragment length polymorphism (RFLP) screening of 150 pcaH clones yielded 68 RFLP families. Comparison of 86 deduced amino acid sequences displayed 70% identity to known PcaH sequences. Phylogenetic analysis results in two major groups mainly related to Pca......H sequences from Actinobacteria and Proteobacteria phyla. This confirms that the developed primer pair targets a wide diversity of pcaH sequences, thereby constituting a suitable molecular marker to estimate the response of the pca community to agricultural practices....

  13. Location optimization of solar plants by an integrated hierarchical DEA PCA approach

    International Nuclear Information System (INIS)

    Unique features of renewable energies such as solar energy has caused increasing demands for such resources. In order to use solar energy as a natural resource, environmental circumstances and geographical location related to solar intensity must be considered. Different factors may affect on the selection of a suitable location for solar plants. These factors must be considered concurrently for optimum location identification of solar plants. This article presents an integrated hierarchical approach for location of solar plants by data envelopment analysis (DEA), principal component analysis (PCA) and numerical taxonomy (NT). Furthermore, an integrated hierarchical DEA approach incorporating the most relevant parameters of solar plants is introduced. Moreover, 2 multivariable methods namely, PCA and NT are used to validate the results of DEA model. The prescribed approach is tested for 25 different cities in Iran with 6 different regions within each city. This is the first study that considers an integrated hierarchical DEA approach for geographical location optimization of solar plants. Implementation of the proposed approach would enable the energy policy makers to select the best-possible location for construction of a solar power plant with lowest possible costs

  14. A PCA Based Automatic Image Categorization Approach Using Dominant Color Features

    Institute of Scientific and Technical Information of China (English)

    WUChunming; QIANHui; WANGDonghui

    2005-01-01

    Automatic Image categorization is a universal problem in area of Content-based image retrieval (CBIR). The goal of automatic image categorization is to find a mapping between images and the predefined image categories. The difficulty of this problem is that how to describe image content and incorporate low-level features into semantic categories. As a solution, we propose a Principal component analysis (PCA) based approach. This approach assumes that the images in the same semantic category have the similar spatial distribution of color components and treats the images in the same category as a linear combination of a fixed set of dominant color blocks with special textural information. A three-step algorithm is designed: (1) extracting Dominant colors (DC) of images, which describe the major color information in an image; (2) Establishing a feature space based on DC blocks and its textural information; (3) using PCA to reduce dimensionality of feature space and using the basis vectors to categorize images. An experimental database containing nine categories including cars, flowers, houses, portraits, fish, bark, sunshine, leaves and fresco is constructed to test the algorithm based on our image categorization approach. The results show that this approach is effective and a reasonable compromise between accuracy and speed in practice.

  15. Spike sorting of heterogeneous neuron types by multimodality-weighted PCA and explicit robust variational Bayes

    Directory of Open Access Journals (Sweden)

    Takashi eTakekawa

    2012-03-01

    Full Text Available This study introduces a new spike sorting method that classifies spike waveforms from multiunit recordings into spike trains of individual neurons. In particular, we develop a method to sort a spike mixture generated by a heterogeneous neural population. Such a spike sorting has a significant practical value, but was previously difficult. The method combines a feature extraction method, which we may term multimodality-weighted principal component analysis (mPCA, and a clustering method by variational Bayes for Student’s t mixture model (SVB. The performance of the proposed method was compared with that of other conventional methods for simulated and experimental data sets. We found that the mPCA efficiently extracts highly informative features as clusters clearly separable in a relatively low-dimensional feature space. The SVB was implemented explicitly without relying on Maximum-A-Posterior (MAP inference for the degree of freedom parameters. The explicit SVB is faster than the conventional SVB derived with MAP inference and works more reliably over various data sets that include spiking patterns difficult to sort. For instance, spikes of a single bursting neuron may be separated incorrectly into multiple clusters, whereas those of a sparsely firing neuron tend to be merged into clusters for other neurons. Our method showed significantly improved performance in spike sorting of these difficult neurons. A parallelized implementation of the proposed algorithm (EToS version 3 is available as open-source code at http://etos.sourceforge.net/.

  16. Feature extraction and recognition of epileptiform activity in EEG by combining PCA with ApEn.

    Science.gov (United States)

    Wang, Chunmei; Zou, Junzhong; Zhang, Jian; Wang, Min; Wang, Rubin

    2010-09-01

    This paper proposes a new method for feature extraction and recognition of epileptiform activity in EEG signals. The method improves feature extraction speed of epileptiform activity without reducing recognition rate. Firstly, Principal component analysis (PCA) is applied to the original EEG for dimension reduction and to the decorrelation of epileptic EEG and normal EEG. Then discrete wavelet transform (DWT) combined with approximate entropy (ApEn) is performed on epileptic EEG and normal EEG, respectively. At last, Neyman-Pearson criteria are applied to classify epileptic EEG and normal ones. The main procedure is that the principle component of EEG after PCA is decomposed into several sub-band signals using DWT, and ApEn algorithm is applied to the sub-band signals at different wavelet scales. Distinct difference is found between the ApEn values of epileptic and normal EEG. The method allows recognition of epileptiform activities and discriminates them from the normal EEG. The algorithm performs well at epileptiform activity recognition in the clinic EEG data and offers a flexible tool that is intended to be generalized to the simultaneous recognition of many waveforms in EEG. PMID:21886676

  17. Modeling of the ORNL PCA Benchmark Using SCALE6.0 Hybrid Deterministic-Stochastic Methodology

    Directory of Open Access Journals (Sweden)

    Mario Matijević

    2013-01-01

    Full Text Available Revised guidelines with the support of computational benchmarks are needed for the regulation of the allowed neutron irradiation to reactor structures during power plant lifetime. Currently, US NRC Regulatory Guide 1.190 is the effective guideline for reactor dosimetry calculations. A well known international shielding database SINBAD contains large selection of models for benchmarking neutron transport methods. In this paper a PCA benchmark has been chosen from SINBAD for qualification of our methodology for pressure vessel neutron fluence calculations, as required by the Regulatory Guide 1.190. The SCALE6.0 code package, developed at Oak Ridge National Laboratory, was used for modeling of the PCA benchmark. The CSAS6 criticality sequence of the SCALE6.0 code package, which includes KENO-VI Monte Carlo code, as well as MAVRIC/Monaco hybrid shielding sequence, was utilized for calculation of equivalent fission fluxes. The shielding analysis was performed using multigroup shielding library v7_200n47g derived from general purpose ENDF/B-VII.0 library. As a source of response functions for reaction rate calculations with MAVRIC we used international reactor dosimetry libraries (IRDF-2002 and IRDF-90.v2 and appropriate cross-sections from transport library v7_200n47g. The comparison of calculational results and benchmark data showed a good agreement of the calculated and measured equivalent fission fluxes.

  18. PCA algorithm for detection, localisation and evolution of damages in gearbox bearings

    Science.gov (United States)

    Pirra, M.; Gandino, E.; Torri, A.; Garibaldi, L.; Machorro-López, J. M.

    2011-07-01

    A fundamental aspect when dealing with rolling element bearings, which often represent a key component in rotating machineries, consists in correctly identifying a degraded behaviour of a bearing with a reasonable level of confidence. This is one of the main requirements a health and usage monitoring system (HUMS) should have. This paper introduces a monitoring technique for the diagnosis of bearing faults based on Principal Component Analysis (PCA). This method overcomes the problem of acquiring data under different environmental conditions (hardly biasing the data) and allows accurate damage recognition, also assuring a rather low number of False Alarms (FA). In addition, a novel criterion is proposed in order to isolate the area in which the faulty bearing stands. Another useful feature of this PCA-based method concerns the capability to observe an increasing trend in the evolution of bearing degradation. The described technique is tested on an industrial rig (designed by Avio S.p.A.), consisting of a full size aeroengine gearbox. Healthy and variously damaged bearings, such as with an inner or rolling element fault, are set up and vibration signals are collected and processed in order to properly detect a fault. Finally, data collected from a test rig assembled by the Dynamics & Identification Research Group (DIRG) are used to demonstrate that the proposed method is able to correctly detect and to classify different levels of the same type of fault and also to localise it.

  19. PCA algorithm for detection, localisation and evolution of damages in gearbox bearings

    International Nuclear Information System (INIS)

    A fundamental aspect when dealing with rolling element bearings, which often represent a key component in rotating machineries, consists in correctly identifying a degraded behaviour of a bearing with a reasonable level of confidence. This is one of the main requirements a health and usage monitoring system (HUMS) should have. This paper introduces a monitoring technique for the diagnosis of bearing faults based on Principal Component Analysis (PCA). This method overcomes the problem of acquiring data under different environmental conditions (hardly biasing the data) and allows accurate damage recognition, also assuring a rather low number of False Alarms (FA). In addition, a novel criterion is proposed in order to isolate the area in which the faulty bearing stands. Another useful feature of this PCA-based method concerns the capability to observe an increasing trend in the evolution of bearing degradation. The described technique is tested on an industrial rig (designed by Avio S.p.A.), consisting of a full size aeroengine gearbox. Healthy and variously damaged bearings, such as with an inner or rolling element fault, are set up and vibration signals are collected and processed in order to properly detect a fault. Finally, data collected from a test rig assembled by the Dynamics and Identification Research Group (DIRG) are used to demonstrate that the proposed method is able to correctly detect and to classify different levels of the same type of fault and also to localise it.

  20. PCA Analysis of the Geomagnetic Field at Mid-Latitude Regions during High Solar Activity

    Science.gov (United States)

    Natali, Maria Paula; Meza, Amalia Margarita

    2016-07-01

    Our study is focused on the analysis of the geomagnetic variability of the H, D and Z components in the Northern hemisphere at mid-latitudes. We analyze two different local times, noon and night, recorded by 22 permanent observatories distributed over Europe and North America during a period of four years of high solar activity comprising 2000-2003. We used Principal Component Analysis (PCA) in order to identify the spatial and temporal variations of the geomagnetic field components. This technique produces a quite compact representation of the data by defining an orthonormal base derived from correlation within the data set. This helps us to identify possible causes of seasonal variations and anomalies, linking them with already observed currents. In fact, the analysis of PCA amplitudes and modes support our interpretation of the spectral and statistical features of the geomagnetic field. Using the first two modes we reconstruct more than 90% of the original signal for the European and North American region. The obtained results reconfirm the existence of a latitudinal dependence in the geomagnetic components during nighttime hours, associated with the ring current. During noon, the first mode represent the dominant component of the current originated by the ionosphere, while the second mode show the presence of a longitudinal variation at both sides of the longitudes with zero declination for Europe and North America.

  1. PCA-SVM based CAD System for Focal Liver Lesions using B-Mode Ultrasound Images

    Directory of Open Access Journals (Sweden)

    Jitendra Virmani

    2013-09-01

    Full Text Available The contribution made by texture of regions inside and outside of the lesions in classification of focal liver lesions (FLLs is investigated in the present work. In order to design an efficient computer-aided diagnostic (CAD system for FLLs, a representative database consisting of images with (1 typical and atypical cases of cyst, hemangioma (HEM and metastatic carcinoma (MET lesions, (2 small as well as large hepatocellular carcinoma (HCC lesions and (3 normal (NOR liver tissue is used. Texture features are computed from regions inside and outside of the lesions. Feature set consisting of 208 texture features, (i.e. 104 texture features and 104 texture ratio features is subjected to principal component analysis (PCA for finding the optimal number of principal components to train a support vector machine (SVM classifier for the classification task. The proposed PCA-SVM based CAD system yielded classification accuracy of 87.2% with the individual class accuracy of 85%, 96%, 90%, 87.5% and 82.2% for NOR, Cyst, HEM, HCC and MET cases respectively. The accuracy for typical, atypical, small HCC and large HCC cases is 87.5%, 86.8%, 88.8%, and 87% respectively. The promising results indicate usefulness of the CAD system for assisting radiologists in diagnosis of FLLs.Defence Science Journal, 2013, 63(5, pp.478-486, DOI:http://dx.doi.org/10.14429/dsj.63.3951

  2. PCA-SVM based CAD System for Focal Liver Lesions using B-mode Ultrasound Images

    Directory of Open Access Journals (Sweden)

    Jitendra Virmani

    2013-09-01

    Full Text Available The contribution made by texture of regions inside and outside of the lesions in classification of focal liver lesions (FLLs is investigated in the present work. In order to design an efficient computer-aided diagnostic (CAD system for FLLs, a representative database consisting of images with (1 typical and atypical cases of cyst, hemangioma (HEM and metastatic carcinoma (MET lesions, (2 small as well as large hepatocellular carcinoma (HCC lesions and (3 normal (NOR liver tissue is used. Texture features are computed from regions inside and outside of the lesions. Feature set consisting of 208 texture features, (i.e. 104 texture features and 104 texture ratio features is subjected to principal component analysis (PCA for finding the optimal number of principal components to train a support vector machine (SVM classifier for the classification task. The proposed PCA-SVM based CAD system yielded classification accuracy of 87.2% with the individual class accuracy of 85%, 96%, 90%, 87.5% and 82.2% for NOR, Cyst, HEM, HCC and MET cases respectively. The accuracy for typical, atypical, small HCC and large HCC cases is 87.5%, 86.8%, 88.8%, and 87% respectively. The promising results indicate usefulness of the CAD system for assisting radiologists in diagnosis of FLLs.

  3. SN validation of JEF-1 data on PCA-replica shielding benchmark

    Energy Technology Data Exchange (ETDEWEB)

    Pescarini, M.

    1991-12-31

    The results of a DOT 3.5-E/JEF-1 validation on the (H20/Fe) PCA-REPLICA (UKAEA-Winfith) low-flux shielding benchmark are presented. The PCA-REPLICA experiment reproduces the ex-core radial geometry of a PWR and is closely related to LWR safety since it is dedicated to test the accuracy of the calculated neutron exposure parameters (fast fluence and iron displacement rates) in a pressure vessel simulator. The SN 1-D ANISN code is used to collapse cross sections from the VITAMIN-J (175 n) shielding library, based on the JEF-1 data, to a 28 group working library for 2-D calculations. A 3-D-equivalent synthesis (X,Y,Z) of 2-D and 1-D DOT 3.5-E SN calculations in plane geometry, gives the integral and spectral results for comparison with the respective experimental data. The underprediction of the in-vessel dosimeter experimental activities depends probably on an overestimation of the Fe-56 iron inelastic scattering cross section in the JEF-1 natural iron file.

  4. Representing teleconnection patterns over Europe: A comparison of SOM and PCA methods

    Science.gov (United States)

    Rousi, Ε.; Anagnostopoulou, C.; Tolika, K.; Maheras, P.

    2015-01-01

    The main goal of this study is a comparison of two different methods of pattern recognition. The first, Principal Component Analysis (PCA), is a method frequently used in climatology. The second, Self Organizing Maps (SOM), is a relatively new and efficient method based on Artificial Neural Networks (ANN). In order to compare the two methodologies, two teleconnection patterns were chosen, the North Atlantic Oscillation (NAO), which mostly affects the climate of Western Europe, and the North Sea-Caspian Pattern (NCP), mainly affecting eastern Mediterranean and the Balkan Peninsula. The teleconnection patterns are studied for winter 500 hPa geopotential height anomalies over the broader Europe area. The secondary objective of the study is to evaluate the ECHAM5/MPI General Circulation Model (GCM) in representing the two teleconnection patterns for a reference (1971-2000) and a future (2071-2100) period. The evaluation of the reference period is done comparing the simulated data to the NCEP/NCAR reanalysis data. The future period is studied to examine whether the current dominant circulation patterns change or not during the last 30 years of the 21st century. According to the results, both PCA and SOM methodologies capture the main variability mode over the study area, represented by the NAO pattern, but SOM is capable of capturing even less pronounced patterns, such as the NCP. In the future simulations, the atmospheric circulation during winter seems to be more pronounced with stronger NAO and NCP teleconnection patterns.

  5. A PCA-based method for ancestral informative markers selection in structured populations

    Institute of Scientific and Technical Information of China (English)

    ZHANG Feng; ZHANG Lei; DENG Hong-Wen

    2009-01-01

    Identification of population structure can help trace population histories and identify disease genes.Structured association (SA) is a commonly used approach for population structure identification and association mapping. A major issue with SA is that its performance greatly depends on the informativeness and the numbers of ancestral informative markers (AIMs). Present major AIM selection methods mostly require prior individual ancestry information, which is usually not available or uncertain in practice. To address this potential weakness, we herein develop a novel approach for AIM selection based on principle component analysis (PCA), which does not require prior ancestry information of study subjects. Our simulation and real genetic data analysis results suggest that, with equivalent AIMs,PCA-based selected AIMs can significantly increase the accuracy of inferred individual ancestries compared with traditionally randomly selected AIMs. Our method can easily be applied to whole genome data to select a set of highly informative AIMs in population structure, which can then be used to identify potential population structure and correct possible statistical biases caused by population stratification.

  6. PCA-based ANN approach to leak classification in the main pipes of VVER-1000

    Energy Technology Data Exchange (ETDEWEB)

    Hadad, Kamal; Jabbari, Masoud; Tabadar, Z. [Shiraz Univ. (Iran, Islamic Republic of). School of Mechanical Engineering; Hashemi-Tilehnoee, Mehdi [Islamic Azad Univ., Aliabad Katoul (Iran, Islamic Republic of). Dept. of Engineering

    2012-11-15

    This paper presents a neural network based fault diagnosing approach which allows dynamic crack and leaks fault identification. The method utilizes the Principal Component Analysis (PCA) technique to reduce the problem dimension. Such a dimension reduction approach leads to faster diagnosing and allows a better graphic presentation of the results. To show the effectiveness of the proposed approach, two methodologies are used to train the neural network (NN). At first, a training matrix composed of 14 variables is used to train a Multilayer Perceptron neural network (MLP) with Resilient Backpropagation (RBP) algorithm. Employing the proposed method, a more accurate and simpler network is designed where the input size is reduced from 14 to 6 variables for training the NN. In short, the application of PCA highly reduces the network topology and allows employing more efficient training algorithms. The accuracy, generalization ability, and reliability of the designed networks are verified using 10 simulated events data from a VVER-1000 simulation using DINAMIKA-97 code. Noise is added to the data to evaluate the robustness of the method and the method again shows to be effective and powerful. (orig.)

  7. PCA-based visualization of terahertz time-domain spectroscopy image

    Science.gov (United States)

    Pei, Jihong; Hu, Yong; Xie, Weixin

    2007-11-01

    A novel visualization method of terahertz time-domain spectroscopy (THz-TDS) image is presented, which is based on principal component analysis (PCA) technique. The proposed method include three processing steps: firstly, the THz- TDS image is preprocessed using a spatial vector filtering technique to denoise. Secondly, the THz-TDS image is transformed from spatio-temporal domain to spatio-spectral domain, and the transformed image can be viewed as a multispectral image whose spectral dimensionality D is equal to the sampled number of THz-TDS pulse at each pixel. Thirdly, each of spectrum vector at a pixel is viewed as a point in D dimensional space, the covariance matrix of pixels can be computed, and then three eigenvectors corresponding to the first 3 largest eigenvalues are found by PCA technique. the THz-TDS image is projected along these three eigenvectors. By normalizing these 3 principal component images and mapping them into the RGB space, we can get a synthetic color image as a visualization result of the THz- TDS image. Due to vector-based dimensionality reduction, the proposed method can provide more visual information of the THz-TDS image than scalar-based visualization techniques. Finally, experimental results are provided to demonstrate the performance of the proposed method.

  8. Preventive-comprehensive assessment (PCA): a new screening method for subclinical cognitive problems.

    Science.gov (United States)

    Cucinotta, D; Reggiani, A; Galletti, L; Rasciti, L; De Notariis, S

    2004-01-01

    Physicians often need to be able to assess cognition in a simple way, particularly for screening of subclinical processes in aged people. This paper describes a new, quick test battery called preventive-comprehensive assessment (PCA). It consists of six various testing items (repetition of three words, back-spelling of the word "sport", problem searching ina complex picture, recall of the three words, three progressive colored matrices, clock drawing test), evaluating language, recent memory, executive function, judgment and thinking capacities. The total scores. compared to the normal performance of different age groups, allow us to distinguish between normal and pathological status. If abnormal results are recorded, we need to perform further and deeper neuropsychological investigations, in order to obtain the possibly exact diagnosis. The PCA battery is sensitive and reliable; it can be used in itself, or as a part of a more complex battery of an intense comprehensive evaluation (ICE), carried out in population screening aimed at promoting healthy and active aging. PMID:15207403

  9. An Efficient Hybrid Face Recognition Algorithm Using PCA and GABOR Wavelets

    Directory of Open Access Journals (Sweden)

    Hyunjong Cho

    2014-04-01

    Full Text Available With the rapid development of computers and the increasing, mass use of high-tech mobile devices, vision-based face recognition has advanced significantly. However, it is hard to conclude that the performance of computers surpasses that of humans, as humans have generally exhibited better performance in challenging situations involving occlusion or variations. Motivated by the recognition method of humans who utilize both holistic and local features, we present a computationally efficient hybrid face recognition method that employs dual-stage holistic and local feature-based recognition algorithms. In the first coarse recognition stage, the proposed algorithm utilizes Principal Component Analysis (PCA to identify a test image. The recognition ends at this stage if the confidence level of the result turns out to be reliable. Otherwise, the algorithm uses this result for filtering out top candidate images with a high degree of similarity, and passes them to the next fine recognition stage where Gabor filters are employed. As is well known, recognizing a face image with Gabor filters is a computationally heavy task. The contribution of our work is in proposing a flexible dual-stage algorithm that enables fast, hybrid face recognition. Experimental tests were performed with the Extended Yale Face Database B to verify the effectiveness and validity of the research, and we obtained better recognition results under illumination variations not only in terms of computation time but also in terms of the recognition rate in comparison to PCA- and Gabor wavelet-based recognition algorithms.

  10. Millisecond dips in the RXTE/PCA light curve of Sco X-1 and TNO occultation

    CERN Document Server

    Chang, H K; Liu, C Y; King, S K; Chang, Hsiang-Kuang; Liang, Jau-Shian; Liu, Chih-Yuan; King, Sun-Kun

    2007-01-01

    Millisecond dips in the RXTE/PCA light curve of Sco X-1 were reported recently (Chang et al. 2006), which were interpreted as the occultation of X-rays from Sco X-1 caused by Trans-Neptunian Objects (TNO) of hundred-meter size. Inconclusive signatures of possible instrumental effects in many of these dip events related to high-energy cosmic rays were later found (Jones et al. 2006) and the TNO interpretation became shaky. Here we report more detailed analysis aiming at distinguishing true occultation events from those related to cosmic rays. Based on some indicative criteria derived from housekeeping data and two-channel spectral information, we suggest that about 10% of the dips are probable events of occultation. The total number of TNOs of size from 60 m to 100 m is estiamted to be about 10^{15} accordingly. Limited by the coarser time resolution of standard data modes of RXTE/PCA, however, definite results cannot be obtained. Adequately configured observations with RXTE or other new instruments in the fut...

  11. Reverse PCA, a systematic approach for identifying genes important for the physical interaction between protein pairs.

    Directory of Open Access Journals (Sweden)

    Ifat Lev

    Full Text Available Protein-protein interactions (PPIs are of central importance for many areas of biological research. Several complementary high-throughput technologies have been developed to study PPIs. The wealth of information that emerged from these technologies led to the first maps of the protein interactomes of several model organisms. Many changes can occur in protein complexes as a result of genetic and biochemical perturbations. In the absence of a suitable assay, such changes are difficult to identify, and thus have been poorly characterized. In this study, we present a novel genetic approach (termed "reverse PCA" that allows the identification of genes whose products are required for the physical interaction between two given proteins. Our assay starts with a yeast strain in which the interaction between two proteins of interest can be detected by resistance to the drug, methotrexate, in the context of the protein-fragment complementation assay (PCA. Using synthetic genetic array (SGA technology, we can systematically screen mutant libraries of the yeast Saccharomyces cerevisiae to identify those mutations that disrupt the physical interaction of interest. We were able to successfully validate this novel approach by identifying mutants that dissociate the conserved interaction between Cia2 and Mms19, two proteins involved in Iron-Sulfur protein biogenesis and genome stability. This method will facilitate the study of protein structure-function relationships, and may help in elucidating the mechanisms that regulate PPIs.

  12. A PCA-based method for ancestral informative markers selection in structured populations

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    Identification of population structure can help trace population histories and identify disease genes. Structured association (SA) is a commonly used approach for population structure identification and association mapping. A major issue with SA is that its performance greatly depends on the informa-tiveness and the numbers of ancestral informative markers (AIMs). Present major AIM selection meth-ods mostly require prior individual ancestry information, which is usually not available or uncertain in practice. To address this potential weakness, we herein develop a novel approach for AIM selection based on principle component analysis (PCA), which does not require prior ancestry information of study subjects. Our simulation and real genetic data analysis results suggest that, with equivalent AIMs, PCA-based selected AIMs can significantly increase the accuracy of inferred individual ancestries compared with traditionally randomly selected AIMs. Our method can easily be applied to whole genome data to select a set of highly informative AIMs in population structure, which can then be used to identify potential population structure and correct possible statistical biases caused by population stratification.

  13. A Method for Aileron Actuator Fault Diagnosis Based on PCA and PGC-SVM

    Directory of Open Access Journals (Sweden)

    Wei-Li Qin

    2016-01-01

    Full Text Available Aileron actuators are pivotal components for aircraft flight control system. Thus, the fault diagnosis of aileron actuators is vital in the enhancement of the reliability and fault tolerant capability. This paper presents an aileron actuator fault diagnosis approach combining principal component analysis (PCA, grid search (GS, 10-fold cross validation (CV, and one-versus-one support vector machine (SVM. This method is referred to as PGC-SVM and utilizes the direct drive valve input, force motor current, and displacement feedback signal to realize fault detection and location. First, several common faults of aileron actuators, which include force motor coil break, sensor coil break, cylinder leakage, and amplifier gain reduction, are extracted from the fault quadrantal diagram; the corresponding fault mechanisms are analyzed. Second, the data feature extraction is performed with dimension reduction using PCA. Finally, the GS and CV algorithms are employed to train a one-versus-one SVM for fault classification, thus obtaining the optimal model parameters and assuring the generalization of the trained SVM, respectively. To verify the effectiveness of the proposed approach, four types of faults are introduced into the simulation model established by AMESim and Simulink. The results demonstrate its desirable diagnostic performance which outperforms that of the traditional SVM by comparison.

  14. Síndrome de Horner y bloqueo del plexo braquial ipsilateral en un caso de analgesia epidural para el trabajo del parto Horner´s sydrome and ipsilateral brachial plexus block during an epidural analgesia labour procedure

    Directory of Open Access Journals (Sweden)

    J. Avellanosa

    2006-10-01

    Full Text Available El Síndrome de Horner es una complicación de la anestesia epidural que aparece más frecuentemente en pacientes obstétricas debido a los cambios fisiológicos y anatómicos propios del embarazo; sin embargo, su incidencia es baja, y sólo se han descrito dos casos previos asociando un bloqueo del plexo braquial. Presentamos el caso de una gestante de 23 años que precisó analgesia epidural para el trabajo de parto. Tras comprobar la correcta colocación del catéter se administró una dosis inicial en bolo de 8 ml de ropivacaína 0,2% y 50 μgr de fentanilo, y se iniciσ una perfusión de ropivacaína a 0,125% y fentanilo a 1,2 μg/ml a 10 mg/h. Tras cuatro horas de perfusión, la paciente alcanza dilatación completa y pasa a quirófano para realizar prueba de parto. Allí se administró una dosis de refuerzo por vía epidural con 10 ml de ropivacaína 0,5% y 50 μg de fentanilo. A los 15 minutos, la paciente comenzó a manifestar un cuadro de disestesias en hemicara derecha y miembro superior derecho. A continuación, estando ya la paciente en la zona de recuperación la paciente refirió bloqueo motor y sensitivo de miembros inferiores asociado a pérdida de fuerza de miembro superior derecho y ptosis palpebral, miosis con ligero enrojecimiento de ojo derecho, siendo diagnosticado como síndrome de Horner con bloqueo del plexo braquial ipsilateral, desapareciendo espontáneamente en las tres horas siguientes.Horner´s syndrome is an uncommon side effect after epidural analgesia which occurs more frecuently in pregnant women due to physiological and anatomical changes; however, it has a low incidence, and the association with ipsilateral brachial plexus block has only been published twice before. We report the case of a 23-year-old woman who required epidural analgesia for labor. After verifying correct placement of the catheter, an initial dose of 8 ml of ropivacaine 0,2% with 50 μg of fentanyl was injected. A continuous infusion of

  15. Analgesia pós-operatória em correção cirúrgica de pé torto congênito: comparação entre bloqueio nervoso periférico e bloqueio peridural caudal Analgesia postoperatoria en corrección quirúrgica de pie jorobado congénito: comparación entre bloqueo nervioso periférico y bloqueo epidural caudal Postoperative analgesia for the surgical correction of congenital clubfoot: comparison between peripheral nerve block and caudal epidural block

    Directory of Open Access Journals (Sweden)

    Monica Rossi Rodrigues

    2009-12-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: O procedimento de correção de pé torto congênito (PTC cursa com dor pós-operatória intensa. A técnica mais utilizada em crianças é a peridural caudal associada à anestesia geral. Tem como limitação a curta duração da analgesia pós-operatória. Os bloqueios de nervos periféricos têm sido apontados como procedimentos com baixa incidência de complicações e tempo prolongado de analgesia. O objetivo do estudo foi comparar o tempo de analgesia dos bloqueios nervosos periféricos e bloqueio caudal e o consumo de morfina nas primeiras 24 horas após a correção de PTC em crianças. MÉTODO: Estudo randômico, encoberto, em crianças submetidas à intervenção cirúrgica para liberação póstero-medial de PTC, alocadas em 4 grupos conforme a técnica anestésica: Caudal (ACa; Bloqueios isquiático e femoral (IF; Bloqueios isquiático e safeno (IS; Bloqueio isquiático e anestesia local (IL, associados à anestesia geral. Nas primeiras 24 horas os pacientes receberam dipirona e paracetamol via oral e foram avaliados por anestesiologista que desconhecia a técnica empregada. Conforme escores da escala CHIPPS (Children's and infants postoperative pain scale era administrada morfina via oral (0,19 mg.kg-1 por dia. RESULTADOS: Foram estudadas 118 crianças distribuídas nos grupos ACa (30, IF (32, IS (28 IL (28. O tempo médio entre o bloqueio e a primeira dose de morfina foi 6,16 horas no grupo ACa, 7,05 horas no IF, 7,58 horas no IS e 8,18 horas no IL. O consumo de morfina foi 0,3 mg.kg-1 por dia nos quatro grupos. Não houve diferença significativa entre os grupos. CONCLUSÕES: Os bloqueios nervosos periféricos não promoveram maior tempo de analgesia, tampouco redução no consumo de morfina nas primeiras 24 horas em crianças submetidas à correção de PTC quando comparados ao bloqueio peridural caudal.JUSTIFICATIVA Y OBJETIVOS: El procedimiento de corrección de pie jorobado congénito (PJC, debuta

  16. Duración y calidad de la analgesia postoperatoria después del bloqueo del plexo braquial para cirugía del hombro: ropivacaína 0,5% frente a ropivacaína 0,5% con clonidina

    OpenAIRE

    Esteves, S; Sa, P.; Figueiredo, D.; Souto, A

    2002-01-01

    Resumen OBJETIVOS: Algunos estudios han demostrado que la duración de los bloqueos nerviosos realizados con anestésicos locales puede ser prolongada con clonidina. En este estudio evaluamos la duración y la calidad de la analgesia proporcionada por el bloqueo del plexo braquial por vía interescalénica para cirugía del hombro, comparando la ropivacaína 0,5% con la ropivacaína 0,5% asociada a clonidina. PACIENTES Y MÉTODOS: Treinta pacientes fueron distribuidos en ...

  17. Miocarditis por dengue

    OpenAIRE

    Ricardo Amador García Hernández; Fidel Espinosa Rivera; Lianet Rivero Seriel

    2013-01-01

    El dengue es un arbovirus transmitido por el Aedes aegypti, produce los cuadros clínicos de dengue clásico, dengue hemorrágico y síndrome de choque por dengue, aisladamente se reportan casos de miocarditis. Se presentó un paciente con antecedentes de dengue clásico que manifestó dolor precordial asociado a cambios electrocardiográficos y fue ingresado en este hospital por síndrome coronario agudo probable, al cual se le diagnosticó clínicamente miocarditis por dengue.

  18. Regional analgesia for video-assisted thoracic surgery – a systematic review

    DEFF Research Database (Denmark)

    Julia Steinthorsdottir, Kristin; Wildgaard, Lorna; Jessen Hansen, Henrik;

    2013-01-01

    gold standard for regional analgesia for VATS. This systematic review aimed to assess different regional techniques in regards to effect on acute post-operative pain following VATS, with emphasis on VATS lobectomy. The systematic review of the PubMed, Cochrane Library and Embase databases yielded...

  19. Postoperative analgesia in children: A comparison of three different doses of caudal epidural morphine

    Science.gov (United States)

    Baduni, Neha; Sanwal, Manoj Kumar; Vajifdar, Homay; Agarwala, Radhika

    2016-01-01

    Background and Aims: Caudal epidural block is the most commonly used neuraxial block in children. Morphine has been used as a caudal additive for more than three decades. The aim of our study was to evaluate the efficacy and duration of analgesia of three different doses of caudal epidural morphine (CEM), and to find out the incidence of side effects. Material and Methods: This study was conducted on 75 patients of American Society of Anesthesiologists grades I and II, aged 2-12 years, undergoing lower abdominal and urogenital surgeries. Patients were randomly allocated to one of the three groups according to the dose of morphine. Group I received 30 μg/kg, group II 50 μg/kg, and group III 70 μg/kg. Heart rate, blood pressure, oxygen saturation, electrocardiogram, pain score, sedation score, duration of analgesia, and side-effects were noted. Results: The mean duration of analgesia was 8.63 h in group I, 13.36 h in group II and 19.19 h in group III. Respiratory depression was noted in three patients in group III. One patient in group I had itching. One patient each in groups I, II, and III had nausea/vomiting. Conclusion: CEM significantly prolongs the duration of analgesia, though with a higher dose the risk of respiratory depression should always be kept in mind. PMID:27275053

  20. Spinal cord distribution of 3H-morphine after intrathecal administration: Relationship to analgesia

    International Nuclear Information System (INIS)

    The distribution of intrathecally administered 3H-morphine was examined by light microscopic autoradiography in rat spinal cord and temporal changes in silver grain localization were compared with results obtained from simultaneous measurements of analgesia. After tissue processing, radio-activity was found to have penetrated in superficial as well as in deeper layers (Rexed lamina V, VII, and X) of rat spinal cord within minutes after application. Silver grain density reached maximal values at 30 min in every region of cord studied. Radioactivity decreased rapidly between 30 min and 2 hr and then more slowly over the next 24 hr. In rats tested for responses to a thermal stimulus (tail flick test), intrathecal administration of morphine (5 and 15 micrograms) resulted in significant dose dependent analgesia that peaked at 30 min and lasted up to 5 hr (P less than 0.5). There was a close relationship between analgesia and spinal cord silver grain density during the first 4 hr of the study. It is postulated that the onset of spinal morphine analgesia depends on appearance of molecules at sites of action followed by the activation of anti-nociceptive mechanisms

  1. Spinal cord distribution of sup 3 H-morphine after intrathecal administration: Relationship to analgesia

    Energy Technology Data Exchange (ETDEWEB)

    Nishio, Y.; Sinatra, R.S.; Kitahata, L.M.; Collins, J.G. (Yale Univ. School of Medicine, CT (USA))

    1989-09-01

    The distribution of intrathecally administered {sup 3}H-morphine was examined by light microscopic autoradiography in rat spinal cord and temporal changes in silver grain localization were compared with results obtained from simultaneous measurements of analgesia. After tissue processing, radio-activity was found to have penetrated in superficial as well as in deeper layers (Rexed lamina V, VII, and X) of rat spinal cord within minutes after application. Silver grain density reached maximal values at 30 min in every region of cord studied. Radioactivity decreased rapidly between 30 min and 2 hr and then more slowly over the next 24 hr. In rats tested for responses to a thermal stimulus (tail flick test), intrathecal administration of morphine (5 and 15 micrograms) resulted in significant dose dependent analgesia that peaked at 30 min and lasted up to 5 hr (P less than 0.5). There was a close relationship between analgesia and spinal cord silver grain density during the first 4 hr of the study. It is postulated that the onset of spinal morphine analgesia depends on appearance of molecules at sites of action followed by the activation of anti-nociceptive mechanisms.

  2. Opioid therapy : a trade-off between opioid-analgesia and opioid-induced respiratory depression

    NARCIS (Netherlands)

    Boom, Maria Catharina Anna

    2013-01-01

    Conclusions that may be drawn from the data in this thesis: 1. The ideal drug for antagonism of respiratory depression has not yet been found. At present naloxone seems the most appropriate drug although reversal of respiratory depression coincides with loss of analgesia. New reversal agents acting

  3. The transversus abdominis plane block provides effective postoperative analgesia in patients undergoing total abdominal hysterectomy.

    LENUS (Irish Health Repository)

    Carney, John

    2008-12-01

    Patients undergoing total abdominal hysterectomy suffer significant postoperative pain. The transversus abdominis plane (TAP) block is a recently described approach to providing analgesia to the anterior abdominal wall. We evaluated the analgesic efficacy of the TAP block in patients undergoing total abdominal hysterectomy via a transverse lower abdominal wall incision, in a randomized, controlled, double-blind clinical trial.

  4. Activation of the opioidergic descending pain control system underlies placebo analgesia.

    Science.gov (United States)

    Eippert, Falk; Bingel, Ulrike; Schoell, Eszter D; Yacubian, Juliana; Klinger, Regine; Lorenz, Jürgen; Büchel, Christian

    2009-08-27

    Placebo analgesia involves the endogenous opioid system, as administration of the opioid antagonist naloxone decreases placebo analgesia. To investigate the opioidergic mechanisms that underlie placebo analgesia, we combined naloxone administration with functional magnetic resonance imaging. Naloxone reduced both behavioral and neural placebo effects as well as placebo-induced responses in pain-modulatory cortical structures, such as the rostral anterior cingulate cortex (rACC). In a brainstem-specific analysis, we observed a similar naloxone modulation of placebo-induced responses in key structures of the descending pain control system, including the hypothalamus, the periaqueductal gray (PAG), and the rostral ventromedial medulla (RVM). Most importantly, naloxone abolished placebo-induced coupling between rACC and PAG, which predicted both neural and behavioral placebo effects as well as activation of the RVM. These findings show that opioidergic signaling in pain-modulating areas and the projections to downstream effectors of the descending pain control system are crucially important for placebo analgesia. PMID:19709634

  5. Mechanisms of placebo analgesia: rACC recruitment of a subcortical antinociceptive network.

    Science.gov (United States)

    Bingel, U; Lorenz, J; Schoell, E; Weiller, C; Büchel, C

    2006-01-01

    Placebo analgesia is one of the most striking examples of the cognitive modulation of pain perception and the underlying mechanisms are finally beginning to be understood. According to pharmacological studies, the endogenous opioid system is essential for placebo analgesia. Recent functional imaging data provides evidence that the rostral anterior cingulate cortex (rACC) represents a crucial cortical area for this type of endogenous pain control. We therefore hypothesized that placebo analgesia recruits other brain areas outside the rACC and that interactions of the rACC with these brain areas mediate opioid-dependent endogenous antinociception as part of a top-down mechanism. Nineteen healthy subjects received and rated painful laser stimuli to the dorsum of both hands, one of them treated with a fake analgesic cream (placebo). Painful stimulation was preceded by an auditory cue, indicating the side of the next laser stimulation. BOLD-responses to the painful laser-stimulation during the placebo and no-placebo condition were assessed using event-related fMRI. After having confirmed placebo related activity in the rACC, a connectivity analysis identified placebo dependent contributions of rACC activity with bilateral amygdalae and the periaqueductal gray (PAG). This finding supports the view that placebo analgesia depends on the enhanced functional connectivity of the rACC with subcortical brain structures that are crucial for conditioned learning and descending inhibition of nociception. PMID:16364549

  6. Postoperative pain and gastro-intestinal recovery after colonic resection with epidural analgesia and multimodal rehabilitation

    DEFF Research Database (Denmark)

    Werner, M U; Gaarn-Larsen, L; Basse, L;

    2005-01-01

    The aim of the study was to evaluate initial postoperative pain intensity and the association with recovery of gastrointestinal function and length of stay (LOS) in a multimodal programme with epidural analgesia, early oral nutrition and mobilisation with a 48 h planned hospital stay. One hundred...

  7. Ipsilateral transversus abdominis plane block provides effective analgesia after appendectomy in children: a randomized controlled trial.

    LENUS (Irish Health Repository)

    Carney, John

    2010-10-01

    The transversus abdominis plane (TAP) block provides effective postoperative analgesia in adults undergoing major abdominal surgery. Its efficacy in children remains unclear, with no randomized clinical trials in this population. In this study, we evaluated its analgesic efficacy over the first 48 postoperative hours after appendectomy performed through an open abdominal incision, in a randomized, controlled, double-blind clinical trial.

  8. The Effect of Gabapentin on Preoperative Anxiety and Postoperative Analgesia in Breast Cancer Surgery

    Directory of Open Access Journals (Sweden)

    Seda Kisi

    2014-04-01

    Conclusion: We concluded that pre-emptive orally gabapentin reduced the total amount of tramadol consumption and provided effective analgesia and lower pain scores without hemodynamic side effect but did not affect the STAI-1 anxiety scores. [Cukurova Med J 2014; 39(2.000: 315-322

  9. Comparison of different routes of administration of clonidine for analgesia following anterior cruciate ligament repair

    Directory of Open Access Journals (Sweden)

    Neeru Sahni

    2015-01-01

    Full Text Available Background and Aims: A high percentage of patients undergoing arthroscopic repairs on day care basis complain of inadequate postoperative pain relief. Clonidine was evaluated for the best route as an adjuvant in regional anesthesia in anterior cruciate ligament (ACL repair to prolong analgesia. Material and Methods: A prospective randomized double-blinded study was planned in a tertiary care hospital in North India in which 85 American Society of Anesthesiologists I and II patients undergoing ACL repair were enrolled. All groups received 0.5% hyperbaric bupivacaine intrathecally as in control group C. Group IT received intrathecal 1 μg/kg of clonidine along with hyperbaric bupivacaine, group IA received 0.25% bupivacaine and 1 μg/kg clonidine intra-articularly, and group NB received 0.25% bupivacaine and 1 μg/kg clonidine in femoro-sciatic nerve block (FSNB. Postoperative pain free interval and block characteristics were the primary outcomes studied. Results: Pain-free duration was 546.90 (±93.66 min in group NB (P 0.001 in comparison to other groups. The mean rescue analgesic requirement and cumulative frequency of rescue analgesia were least in group NB, followed by groups IT, IA and C. Conclusion: Clonidine is safe and effective adjuvant with bupivacaine in prolonging analgesia through various routes employed for post knee surgery pain. The maximum prolongation of analgesia is achieved through FSNB with a risk of prolonging postanesthesia care unit stay.

  10. A new animal model of placebo analgesia: involvement of the dopaminergic system in reward learning.

    Science.gov (United States)

    Lee, In-Seon; Lee, Bombi; Park, Hi-Joon; Olausson, Håkan; Enck, Paul; Chae, Younbyoung

    2015-01-01

    We suggest a new placebo analgesia animal model and investigated the role of the dopamine and opioid systems in placebo analgesia. Before and after the conditioning, we conducted a conditioned place preference (CPP) test to measure preferences for the cues (Rooms 1 and 2), and a hot plate test (HPT) to measure the pain responses to high level-pain after the cues. In addition, we quantified the expression of tyrosine hydroxylase (TH) in the ventral tegmental area (VTA) and c-Fos in the anterior cingulate cortex (ACC) as a response to reward learning and pain response. We found an enhanced preference for the low level-pain paired cue and enhanced TH expression in the VTA of the Placebo and Placebo + Naloxone groups. Haloperidol, a dopamine antagonist, blocked these effects in the Placebo + Haloperidol group. An increased pain threshold to high-heat pain and reduced c-Fos expression in the ACC were observed in the Placebo group only. Haloperidol blocked the place preference effect, and naloxone and haloperidol blocked the placebo analgesia. Cue preference is mediated by reward learning via the dopamine system, whereas the expression of placebo analgesia is mediated by the dopamine and opioid systems. PMID:26602173

  11. Avaliação da analgesia de opioide tópico em úlcera de perna de paciente falcêmico Evaluation of the topical application of opioid analgesia for a leg ulcer of a sickle cell disease patient

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    Alexandre F. Neves

    2010-01-01

    Full Text Available A doença falciforme é caracterizada por apresentar várias alterações clinicas e fisiopatológicas nos pacientes que por ela são acometidos. Uma dessas alterações é presença de úlceras de perna dolorosas e de difícil cicatrização, sendo necessário o apoio de equipe multiprofissional no seu manejo e tratamento. Com o objetivo de reduzir a dor associada a úlcera de perna, o paciente falcêmico faz uso de opioides parenterais e enterais que normalmente estão associados a efeitos colaterais indesejados. Com o objetivo de reduzir o uso desses opioides sistêmicos, avaliamos um gel de morfina, de fácil manipulação e baixo custo, que foi utilizado antes e após o processo de troca de curativo das úlceras de perna dos pacientes falcêmicos atendidos em nossa instituição. Baseados na escala analógica da dor foi avaliado o efeito analgésico do gel em 28 pacientes. Todos apresentavam dor grau 7 ou 8 antes da aplicação do gel. Vinte e quatro pacientes (85,7% apresentaram total ausência de dor por um período de 24 horas, não sendo necessário o uso de analgésicos sistêmicos. Em três pacientes (10,7% a ausência de dor durou um periodo de 12horas. Somente um paciente (3,6% não relatou analgesia apos o uso do gel. Os resultados demonstraram que o gel é altamente eficaz no controle da dor das úlceras de perna de pacientes falcêmicos.Sickle cell disease is characterized by several clinical and pathophysiological changes including painful leg ulcers. These are difficult to heal and require the support of a multidisciplinary team in their management. The treatment of pain in these patients usually involves the use of opioids. In order to reduce the use of systemic opioids, we evaluated an easy-to-use low-cost morphine gel (0.12% that was applied before and after changing leg ulcer dressings of sickle cell patients treated in Hemorio hospital. Based on the Analogue Pain Scale (APS we evaluated the analgesic effect of the gel with

  12. Intraoperative haloperidol does not improve quality of recovery and postoperative analgesia

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    Amin Ebneshahidi

    2013-01-01

    Conclusion: Intraoperative small-dose IV haloperidol is effective against post-operative nausea and vomiting with no significant effect on overall QoR. It may also attenuate the analgesic effects of morphine PCA.

  13. A COMPARATIVE STUDY OF EPIDURAL BUPIVACAINE WITH CLONIDINE AND EPIDURAL BUPIVACAINE FOR POST OPERATIVE ANALGESIA

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    Durga Prasad

    2015-10-01

    Full Text Available BACKGROUND: Clonidine, an α 2 - adrenoreceptor agonist, administered epidurally, is gaining popularity for its analgesic, sympatholytic, hemodynamic stabilizing and sedative properties without significant side effects. METHODS: This present study “ A Comparative Study o f Epidural Bupivac aine w ith Clonidine a nd Epidural Bupivacaine f or Post - o perative Analgesia ” was conducted in 70 cases of ASA grade I and II, between the age groups of 30 - 75yrs undergoing abdominal, gynecological and orthopedic surgeries under epidural anaesthesia. At the e nd of surgery, patients were shifted to recovery room. When patients complained of pain with VAS > 4/10, they were allocated to receive either of B: Plain Bupivacaine 0.125% 10ml (n = 35. B+C: Clonidine 150 mcg (1ml + 0.125% Bupivacaine 9ml (n = 35. The following parameters were monitored: A. Onset of analgesia . B. Duration of analgesia . C. VAS and Quality of analgesia . D. ardio - respiratory effects: Pulse rate, blood pressure, respiratory rate. E. Side effects like: nausea, vomiting, pruritus, hypotensio n, sedation and respiratory depression were studied. ONSET OF ANALGESIA: The time of onset of analgesia in group (B+C was significantly less (12.7 ± 0.87 (S.D min when compared to g roup (B (16 ± 3.34 (S.D min. DURATION OF ANALGESIA: The duration of a nalgesia in group (B+C (225.2 ± 45.74 (SD min was significantly more when compared to group (B (119 ± 29.29 (SD min. VISUAL ANALOGUE SCORE: In comparison of group B and group B+C, highly significant difference in VAS was seen from 15min till 3.5hrs in between the groups. The quality of analgesia in Group B+C was VAS 3 - 4 (good to excellent pain relief, as compared to Group B, where VAS was 2 - 3 (fair to good pain relief. SEDATION: In Group B+C from 30min till 2hrs, 100% of patients were asleep (sedat ion score 3. Even in patients with sedation score 3, patients were calm, quiet and asleep but when questions were asked, they answered with

  14. A COMPARATIVE STUDY BETWEEN INTRATHECAL MORPHINE AND INTRATHECAL BUPRENORPHINE FOR POST - OPERATIVE ANALGESIA FOLLOWING CAESARIAN SECTION UNDER SUB ARACHNOID BLOCK

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    Anish M

    2015-05-01

    Full Text Available BACKGROUND: Good pain relief following caesarian section is of great importance and intrathecal opioids provide good quality postoperative analgesia for longer duration. So the following study describes a comparative study between intrathecal morphine and intrathecal buprenorphine for postoperative pain relief following caesarian section (CS under subarachnoid blockade. AIMS: The study was conducted to compare intrathecal morphine and buprenorphine for post of analgesia following CS, to achieve analgesia without seda tion for better maternal child bondage and to popularize intrathecal opioids . MATERIALS AND METHODS: 60 patients posted for CS under SAB were randomly allocated into group A and group B of 30 each, the group A received morphine 0.1 mg and buprenorphine 0 . 0 3 mg was given for group B patients along with the local anaesthetic. Subjective assessment of post - operative analgesia was done by direct questioning of the patient and by a five point pain scores. Duration of analgesia was taken as the time interval betw een the time of injection of intrathecal opiate and the time at which the patient felt pain and requested for additional analgesics. Data’s were analyzed using SPSS 16th version. OBSERVATION AND RESU LTS: The mean duration of post - operative analgesia with i ntrathecal morphine was 24.19+4 . 8 hours and that with buprenorphine was only 11.7+3.28 hours. Over weight patients reported a lower mean duration of analgesia. None of the patients in the study showed any bradycardia, hypotension, desaturation or respirato ry depression. Intrathecal opiates decreased the parenteral opiate requirements. The main side effects noticed were nausea in about 43% of patients in morphine group and 33% of patients in buprenorphine group. CONCLUSIONS: Intrathecal morphine 0 . 1 mg gives good post - operative analgesia of longer duration than buprenorphine 0 . 03mg. The quality of analgesia provided by intrathecal morphine was superior to

  15. Hypnotizability and Placebo Analgesia in Waking and Hypnosis as Modulators of Auditory Startle Responses in Healthy Women: An ERP Study.

    Science.gov (United States)

    De Pascalis, Vilfredo; Scacchia, Paolo

    2016-01-01

    We evaluated the influence of hypnotizability, pain expectation, placebo analgesia in waking and hypnosis on tonic pain relief. We also investigated how placebo analgesia affects somatic responses (eye blink) and N100 and P200 waves of event-related potentials (ERPs) elicited by auditory startle probes. Although expectation plays an important role in placebo and hypnotic analgesia, the neural mechanisms underlying these treatments are still poorly understood. We used the cold cup test (CCT) to induce tonic pain in 53 healthy women. Placebo analgesia was initially produced by manipulation, in which the intensity of pain induced by the CCT was surreptitiously reduced after the administration of a sham analgesic cream. Participants were then tested in waking and hypnosis under three treatments: (1) resting (Baseline); (2) CCT-alone (Pain); and (3) CCT plus placebo cream for pain relief (Placebo). For each painful treatment, we assessed pain and distress ratings, eye blink responses, N100 and P200 amplitudes. We used LORETA analysis of N100 and P200 waves, as elicited by auditory startle, to identify cortical regions sensitive to pain reduction through placebo and hypnotic analgesia. Higher pain expectation was associated with higher pain reductions. In highly hypnotizable participants placebo treatment produced significant reductions of pain and distress perception in both waking and hypnosis condition. P200 wave, during placebo analgesia, was larger in the frontal left hemisphere while placebo analgesia, during hypnosis, involved the activity of the left hemisphere including the occipital region. These findings demonstrate that hypnosis and placebo analgesia are different processes of top-down regulation. Pain reduction was associated with larger EMG startle amplitudes, N100 and P200 responses, and enhanced activity within the frontal, parietal, and anterior and posterior cingulate gyres. LORETA results showed that placebo analgesia modulated pain-responsive areas

  16. Una propuesta para incrementar la capacidad discriminante de las técnicas PCA y LDA aplicadas al reconocimiento de rostros con imágenes IR A Proposal to increase by genetic algorithm the discriminatory

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    Eduardo Caicedo B

    2011-06-01

    Full Text Available Dos de las técnicas más ampliamente utilizadas en el campo del reconocimiento de rostros con imágenes infrarrojas son PCA (Principal Component Analisys y LDA (Linear Discriminant Analysis. En este trabajo se presentan los resultados obtenidos al emplear algoritmos genéticos para incrementar el poder discriminante de los vectores que conforman el espacio de características generado por dichas técnicas, por medio de la asignación ponderada de pesos a cada vector según su nivel de aporte en la etapa de clasificación. Se muestra que bajo el esquema propuesto, se obtiene un menor error de clasificación respecto al método convencional.PCA and LDA are two of most widely used techniques for face recognition with IR images. In this paper we report the results obtained by using Genetics Algorithms for optimization the characteristic vector generated by these techniques, by assignation of weights to each vector according its performance in the classification task. It shows that, under the proposed scheme, is able to obtain a lower classification error compared to conventional method.

  17. Effects of epidural lidocaine analgesia on labor and delivery: A randomized, prospective, controlled trial

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    Nafisi Shahram

    2006-12-01

    Full Text Available Abstract Background Whether epidural analgesia for labor prolongs the active-first and second labor stages and increases the risk of vacuum-assisted delivery is a controversial topic. Our study was conducted to answer the question: does lumbar epidural analgesia with lidocaine affect the progress of labor in our obstetric population? Method 395 healthy, nulliparous women, at term, presented in spontaneous labor with a singleton vertex presentation. These patients were randomized to receive analgesia either, epidural with bolus doses of 1% lidocaine or intravenous, with meperidine 25 to 50 mg when their cervix was dilated to 4 centimeters. The duration of the active-first and second stages of labor and the neonatal apgar scores were recorded, in each patient. The total number of vacuum-assisted and cesarean deliveries were also measured. Results 197 women were randomized to the epidural group. 198 women were randomized to the single-dose intravenous meperidine group. There was no statistical difference in rates of vacuum-assisted delivery rate. Cesarean deliveries, as a consequence of fetal bradycardia or dystocia, did not differ significantly between the groups. Differences in the duration of the active-first and the second stages of labor were not statistically significant. The number of newborns with 1-min and 5-min Apgar scores less than 7, did not differ significantly between both analgesia groups. Conclusion Epidural analgesia with 1% lidocaine does not prolong the active-first and second stages of labor and does not increase vacuum-assisted or cesarean delivery rate.

  18. Influence of preemptive analgesia on pulmonary function and complications for laparoscopic cholecystectomy.

    Science.gov (United States)

    Şen, Meral; Özol, Duygu; Bozer, Mikdat

    2009-12-01

    Pain and diaphragmatic dysfunction are the major reasons for postoperative pulmonary complications after upper abdominal surgery. Preoperative administration of analgesics helps to reduce and prevent pain. The objective of this study was first to research the rate of pulmonary complications for laparoscopic cholecystectomy (LC) and then analyze the influence of preemptive analgesia on pulmonary functions and complications. Seventy patients scheduled for elective LC were included in our double-blind, randomized, placebo-controlled, prospective study. Randomly, 35 patients received 1 g etofenamate (group 1) and 35 patients 0.9% saline (group 2) intramuscularly 1 h before surgery. All patients underwent physical examination, chest radiography, lung function tests, and pulse oxygen saturation measurements 2 h before surgery and postoperatively on day 2. Atelectasis was graded as micro, focal, segmental, or lobar. With preemptive analgesia, the need for postoperative analgesia decreased significantly in group 1. In both groups mean spirometric values were reduced significantly after the operation, but the difference and proportional change according to preoperative recordings were found to be similar [29.5 vs. 31.3% reduction in forced vital capacity (FVC) and 32.9 vs. 33.5% reduction in forced expiratory volume in 1 s (FEV(1)) for groups 1 and 2, respectively]. There was an insignificant drop in oxygen saturation rates for both groups. The overall incidence of atelectasia was similar for group 1 and 2 (30.2 vs. 29.2%). Although the degree of atelectesia was found to be more severe in the placebo group, the difference was not statistically significant. We concluded that although preemptive analgesia decreased the need for postoperative analgesia, this had no effect on pulmonary functions and pulmonary complications. PMID:19117121

  19. Hospitalization for partial nephrectomy was not associated with intrathecal opioid analgesia: Retrospective analysis

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    Toby N Weingarten

    2014-01-01

    Full Text Available Background: The aim of this retrospective study is to test the hypothesis that the use of spinal analgesia shortens the length of hospital stay after partial nephrectomy. Materials and Methods: We reviewed all patients undergoing partial nephrectomy for malignancy through flank incision between January 1, 2008, and June 30, 2011. We excluded patients who underwent tumor thrombectomy, used sustained-release opioids, or had general anesthesia supplemented by epidural analgesia. Patients were grouped into "spinal" (intrathecal opioid injection for postoperative analgesia versus "general anesthetic" group, and "early" discharge group (within 3 postoperative days versus "late" group. Association between demographics, patient physical status, anesthetic techniques, and surgical complexity and hospital stay were analyzed using multivariable logistic regression analysis. Results: Of 380 patients, 158 (41.6% were discharged "early" and 151 (39.7% were "spinal" cases. Both spinal and early discharge groups had better postoperative pain control and used less postoperative systemic opioids. Spinal analgesia was associated with early hospital discharge, odds ratio 1.52, (95% confidence interval 1.00-2.30, P = 0.05, but in adjusted analysis was no longer associated with early discharge, 1.16 (0.73-1.86, P = 0.52. Early discharge was associated with calendar year, with more recent years being associated with early discharge. Conclusion: Spinal analgesia combined with general anesthesia was associated with improved postoperative pain control during the 1 st postoperative day, but not with shorter hospital stay following partial nephrectomy. Therefore, unaccounted practice changes that occurred during more recent times affected hospital stay.

  20. Ellagic acid enhances morphine analgesia and attenuates the development of morphine tolerance and dependence in mice.

    Science.gov (United States)

    Mansouri, Mohammad Taghi; Naghizadeh, Bahareh; Ghorbanzadeh, Behnam

    2014-10-15

    According to our previous study, ellagic acid has both dose-related central and peripheral antinociceptive effect through the opioidergic and l-arginine-NO-cGMP-ATP sensitive K(+) channel pathways. In the present study, the systemic antinociceptive effects of ellagic acid in animal models of pain, and functional interactions between ellagic acid and morphine in terms of analgesia, tolerance and dependence were investigated. Ellagic acid (1-30mg/kg; i.p.) showed significant and dose-dependent antinociceptive effects in the acetic acid-induced writhing test. Intraperitoneal ellagic acid acutely interacted with morphine analgesia in a synergistic manner in this assay. Ellagic acid (1-10mg/kg; i.p.) also exerted analgesic activity in the hot-plate test. Pre-treatment with naloxone (1mg/kg; i.p.) significantly reversed ellagic acid, morphine as well as ellagic acid-morphine combination-induced antinociceptin in these two tests. More importantly, when co-administered with morphine, ellagic acid (1-10mg/kg) effectively blocked the development of tolerance to morphine analgesia in the hot-plate test. Likewise, ellagic acid dose-dependently prevented naloxone-precipitated withdrawal signs including jumping and weight loss. Ellagic acid treatment (1-30mg/kg; i.p.) had no significant effect on the locomotion activity of animals using open-field task. Therefore, these results showed that ellagic acid has notable systemic antinociceptive activity for both tonic and phasic pain models. Altogether, ellagic acid might be used in pain relief alone or in combination with opioid drugs because of enhancing morphine analgesia and preventing morphine-induced tolerance to analgesia and dependence. PMID:25179576

  1. Comparison of efficacy of bupivacaine and fentanyl with bupivacaine and sufentanil for epidural labor analgesia

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    Kalra Sumit

    2010-01-01

    Full Text Available Objectives: A study to compare the efficacy between fentanyl and sufentanil combined with low concentration (0.0625% of bupivacaine for epidural labor analgesia in laboring women. Materials and Methods: Fifty full term parturients received an initial bolus dose of a 10 ml solution containing 0.125% bupivacaine. The patients were randomly divided into two: group F received 0.0625% bupivacaine with 2.5 mcg/ml fentanyl and group S received 0.0625% bupivacaine with 0.25 mcg/ml sufentanil. Verbal analogue pain scores, need of supplementary/rescue boluses dose of bupivacaine consumed, mode of delivery, maternal satisfaction, and neonatal Apgar scores were recorded. No significant difference was observed between both groups. Results: Both the groups provided equivalent labor analgesia and maternal satisfaction. The chances of cesarean delivery were also not increased in any group. No difference in the cephalad extent of sensory analgesia, motor block or neonatal Apgar score were observed. Although mean pain scores throughout the labor and delivery were similar in both groups, more patients in fentanyl group required supplementary boluses though not statistically significant. Conclusion: We conclude that both 0.0625% bupivacaine-fentanyl (2.5 μg/ml and 0.0625% bupivacaine-sufentanil (0.25 μg/ml were equally effective by continuous epidural infusion in providing labor analgesia with hemodynamic stability achieving equivalent maternal satisfaction without serious maternal or fetal side effects. We found that sufentanil was 10 times more potent than fentanyl as an analgesic for continuous epidural labor analgesia.

  2. Comparative study of caudal bupivacaine versus bupivacaine with tramadol for postoperative analgesia in paediatric cancer patients

    Institute of Scientific and Technical Information of China (English)

    Mohammed Hegazy; Ayman A. Ghoneim

    2013-01-01

    Objective: Caudal epidural analgesia has become very common analgesic technique in paediatric surgery. Add-ing tramadol to bupivacaine for caudal injection prolongs duration of analgesia with minimal side effects. The aim of the study was to investigate the different effects of caudal bupivacaine versus bupivacaine with thamadol for postoperative analgesia in paediatric cancer patients. Methods: A prospective randomized controlled trial was conducted over 40 paediatric cancer pa-tients who were recruited from Children Cancer Hospital of Egypt (57357 Hospital). Patients were randomized into 2 groups: bupivacaine group (group B, 20 patients) to receive single shot caudal block of 1 mL/kg 0.1875% bupivacaine; tramadol group (group T, 20 patients) prepared as group B with the addition of 1 mg/kg caudal tramadol. Results: The mean duration of analgesia was significantly longer among group T than group B [(24 ± 13.7) hours versus (7 ± 3.7) hours respectively with P = 0.001]. Group T showed a significantly lower mean FLACC score than group B (2.2 ± 0.9 versus 3.6 ± 0.6 with P = 0.002). The difference in FLACC score was comparable on arrival, and after 2 and 4 hours. At 8 and 12 hours the group B recorded significantly higher scores (P = 0.002 and 0.0001 respectively). There were no significant differences between the groups as regards sedation score [the median in both groups was 1 (0–1) with P value = o.8]. No one developed facial flush or pruritis. Conclusion: Caudal injection of low dose tramadol 1 mg/kg with bupivacaine 0.1875% is proved to be effective, long standing technique for postoperative analgesia in major paediatric cancer surgery and almost devoid of side effect.

  3. Comparative Evaluation of Urinary PCA3 and TMPRSS2: ERG Scores and Serum PHI in Predicting Prostate Cancer Aggressiveness

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    Lucile Tallon

    2014-07-01

    Full Text Available It has been suggested that urinary PCA3 and TMPRSS2:ERG fusion tests and serum PHI correlate to cancer aggressiveness-related pathological criteria at prostatectomy. To evaluate and compare their ability in predicting prostate cancer aggressiveness, PHI and urinary PCA3 and TMPRSS2:ERG (T2 scores were assessed in 154 patients who underwent radical prostatectomy for biopsy-proven prostate cancer. Univariate and multivariate analyses using logistic regression and decision curve analyses were performed. All three markers were predictors of a tumor volume ≥0.5 mL. Only PHI predicted Gleason score ≥7. T2 score and PHI were both independent predictors of extracapsular extension (≥pT3, while multifocality was only predicted by PCA3 score. Moreover, when compared to a base model (age, digital rectal examination, serum PSA, and Gleason sum at biopsy, the addition of both PCA3 score and PHI to the base model induced a significant increase (+12% when predicting tumor volume >0.5 mL. PHI and urinary PCA3 and T2 scores can be considered as complementary predictors of cancer aggressiveness at prostatectomy.

  4. Heart Rate Variability Classification and Feature Extraction Using Support Vector Machine and PCA: An Overview

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    Rahul Pitale

    2014-01-01

    Full Text Available In today’s era Heart Rate Variability becomes an important characteristic to determine the condition of heart. That’s why the calculation of HRV and classification to generate rules is necessary. Human Heart Generates the electrical signal. ECG is used to detect the heart beat. ECG signal contains lots of noise. To classify the signals first to decompose the signals using wavelet transform. Many Mother wavelet are used to denoise the signals. Support Vector Machine is used to classify the denoise signal and recognize pattern for better classification of ECG signal. Various methods have been done using different classification tools like Neural Network, Support Vector Machine, and Wavelet transform. Among them Support Vector Machine is very successful in many research areas such as pattern recognition, bioinformatics, etc. This paper gives Brief Survey on Support Vector Machine and Combination of Wavelet Transform & PCA for better Feature Extraction of ECG signals

  5. Mine-hoist fault-condition detection based on the wavelet packet transform and kernel PCA

    Institute of Scientific and Technical Information of China (English)

    XIA Shi-xiong; NIU Qiang; ZHOU Yong; ZHANG Lei

    2008-01-01

    A new algorithm was developed to correctly identify fault conditions and accurately monitor fault development in a mine hoist. The new method is based on the Wavelet Packet Transform (WPT) and kernel PCA (Kernel Principal Component Analysis, KPCA). For non-linear monitoring systems the key to fault detection is the extracting of main features. The wavelet packet transform is a novel technique of signal processing that possesses excellent characteristics of time-frequency localization. It is suitable for analysing time-varying or transient signals. KPCA maps the original input features into a higher dimension feature space through a non-linear mapping. The principal components are then found in the higher dimension feature space. The KPCA transformation was applied to extracting the main nonlinear features from experimental fault feature data after wavelet packet transformation. The results show that the proposed method affords credible fault detection and identification.

  6. Prediction of Daily Concentration of Carbon Monoxide based on PCA-ANN

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    Saeed Almasi

    2015-01-01

    Full Text Available Air pollution crisis is one of the gifts of industrial and technological development. It is increasing with population growth, urbanity, and consumption of fossil fuels. Air pollution crisis put the people who inhabit in polluted areas in danger. Although senior government managers have already done a lot of affairs to inhibit production and decrease the risks of all kinds of pollutants, they should survey the research issues relating to the solution of air pollution crisis at first to control and anticipate the amount of pollutant indexes. In this paper, the effects of PCA (principle component analysis on the efficiency of two kinds of Artificial Neural Network (MLP, ANFIS are studied to anticipate the daily density of CO in the weather of Tehran city. This research shows that the decrease in many variables and the recognition of effective variables on ANN improve performance neural network training speed.

  7. PCA and Clustering based Weld Flaw Detection from Radiographic Weld Images

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    Dr.V. Vaithiyanathan

    2013-06-01

    Full Text Available Pattern recognition of weld defects can be done by partitioning the data points into clusters.The weld defect arises due to various types of adverse conditions and carelessness at the time of welding which leads to major disasters at the later stage. This paper proposes a method for detection of Burn Through, Slag Inclusion and Lack of Penetration weld defects in radiographic images which follow a specific pattern for each type. The image is preprocessed using Histogram equalization and segmented using Region growing methodology. The feature dimension reduction is performed using PCA, which is an unsupervised dimension reduction methodology which chooses the dimensions with the largest variance. K-Means clustering is used for clustering a cohesive group from a set of patterns after performing dimensionality reduction using Principal Component Analysis. The result of classification using this technique is providing a very accurate classification of weld defect.

  8. Use of Wavelet-Fuzzy Features with PCA for Image Registration

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    Safia Sadruddin

    2014-01-01

    Full Text Available In this paper, we discuss an Image Registration system based on neural network, which uses Wavelet-fuzzy features of an image. In this system, Wavelet-fuzzy features are extracted from an image and then reduced using Principal Component Analysis (PCA. The reduced feature set is then used for training the neural network for image registration. The geometric transformation between the reference and sensed image sets are evaluated using affine transformation parameters. The trained neural network produces registration parameters (translation, rotation and scaling with respect to reference and sensed image. Two parameters namely Mean Absolute Registration Error and Mutual Information are used as evaluation parameters. Experimentally, we show that the proposed technique for image registration is accurate and robust for distorted and noisy inputs.

  9. Classification of Abnormalities in Brain MRI Images Using PCA and SVM

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    Ajala Funmilola A

    2015-07-01

    Full Text Available The impact of digital image processing is increasing by the day for its use in the medical and research areas. Medical image classification scheme has been on the increase in order to help physicians and medical practitioners in their evaluation and analysis of diseases. Several classification schemes such as Artificial Neural Network (ANN, Bayes Classification, Support Vector Machine (SVM and K-Means Nearest Neighbor have been used. In this paper, we evaluate and compared the performance of SVM and PCA by analyzing diseased image of the brain (Alzheimer and normal (MRI brain. The results show that Principal Components Analysis outperforms the Support Vector Machine in terms of training time and recognition time.

  10. GPCA vs. PCA in Recognition and 3-D Localization of Ultrasound Reflectors

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    Carlos A. Luna

    2010-05-01

    Full Text Available In this paper, a new method of classification and localization of reflectors, using the time-of-flight (TOF data obtained from ultrasonic transducers, is presented. The method of classification and localization is based on Generalized Principal Component Analysis (GPCA applied to the TOF values obtained from a sensor that contains four ultrasound emitters and 16 receivers. Since PCA works with vectorized representations of TOF, it does not take into account the spatial locality of receivers. The GPCA works with two-dimensional representations of TOF, taking into account information on the spatial position of the receivers. This report includes a detailed description of the method of classification and localization and the results of achieved tests with three types of reflectors in 3-D environments: planes, edges, and corners. The results in terms of processing time, classification and localization were very satisfactory for the reflectors located in the range of 50–350 cm.

  11. Bootstrap-based confidence estimation in PCA and multivariate statistical process control

    DEFF Research Database (Denmark)

    Babamoradi, Hamid

    on assumptions that do not always hold in practice. The aim of this thesis was to illustrate the concept of bootstrap-based confidence estimation in PCA and MSPC. It particularly shows how to build bootstrapbased confidence limits in these areas to be used as alternative to the traditional....../asymptotic limits. The goal was to improve process monitoring by improving the quality of MSPC charts and contribution plots. Bootstrapping algorithm to build confidence limits was illustrated in a case study format (Paper I). The main steps in the algorithm were discussed where a set of sensible choices (plus the...... recommended decisions) to build rational confidence limits were given. Two NIR datasets were used to study the effect of outliers and bimodal distributions on the bootstrap-based limits. The results showed that bootstrapping can give reasonable estimate of distributions for scores and loadings. It can also be...

  12. Study on the Urban Development Level in Hubei Province Based on PCA and AHP

    Directory of Open Access Journals (Sweden)

    Yazhou Xiong

    2013-03-01

    Full Text Available Based on the major cities in Hubei province as the research object, the comprehensive evaluation indicator system and evaluation model of the urban development level evaluation in Hubei are proposed via systems analysis. The study makes a Principal Components Analysis (PCA to the original data by means of SPSS; Next, this study analyzes the studied data via Analytic Hierarchy Process (AHP as well as illuminates the key principles of the AHP and that, comprehensive score and ranking of development level of the main cities in Hubei is obtained and all the regions are divided into three clusters via K-means clustering analysis; Finally, this study appraises urban development level of Hubei synthetically.

  13. Human Classification Based on Gestural Motions by Using Components of PCA

    International Nuclear Information System (INIS)

    Lately, a study of human capabilities with the aim to be integrated into machine is the famous topic to be discussed. Moreover, human are bless with special abilities that they can hear, see, sense, speak, think and understand each other. Giving such abilities to machine for improvement of human life is researcher's aim for better quality of life in the future. This research was concentrating on human gesture, specifically arm motions for differencing the individuality which lead to the development of the hand gesture database. We try to differentiate the human physical characteristic based on hand gesture represented by arm trajectories. Subjects are selected from different type of the body sizes, and then acquired data undergo resampling process. The results discuss the classification of human based on arm trajectories by using Principle Component Analysis (PCA)

  14. Combination of PCA and LORETA for sources analysis of ERP data: an emotional processing study

    Science.gov (United States)

    Hu, Jin; Tian, Jie; Yang, Lei; Pan, Xiaohong; Liu, Jiangang

    2006-03-01

    The purpose of this paper is to study spatiotemporal patterns of neuronal activity in emotional processing by analysis of ERP data. 108 pictures (categorized as positive, negative and neutral) were presented to 24 healthy, right-handed subjects while 128-channel EEG data were recorded. An analysis of two steps was applied to the ERP data. First, principal component analysis was performed to obtain significant ERP components. Then LORETA was applied to each component to localize their brain sources. The first six principal components were extracted, each of which showed different spatiotemporal patterns of neuronal activity. The results agree with other emotional study by fMRI or PET. The combination of PCA and LORETA can be used to analyze spatiotemporal patterns of ERP data in emotional processing.

  15. NGC 7097: the AGN and its mirror, revealed by PCA Tomography

    CERN Document Server

    Ricci, T V; Menezes, R B

    2011-01-01

    Three-dimensional (3D) spectroscopy techniques are becoming more and more popular, producing an increasing number of large data cubes. The challenge of extracting information from these cubes requires the development of new techniques for data processing and analysis. We apply the recently developed technique of Principal Component Analysis (PCA) Tomography to a data cube from the center of the elliptical galaxy NGC 7097 and show that this technique is effective in decomposing the data into physically interpretable information. We find that the first five principal components of our data are associated with distinct physical characteristics. In particular, we detect a LINER with a weak broad component in the Balmer lines. Two images of the LINER are present in our data, one seen through a disk of gas and dust, and the other after scattering by free electrons and/or dust particles in the ionization cone. Furthermore, we extract the spectrum of the LINER, decontaminated from stellar and extended nebular emissio...

  16. A fuzzy neural network combining wavelet denoising and PCA for sensor signal estimation

    International Nuclear Information System (INIS)

    In this work, a fuzzy neural network is used to estimate the relevant sensor signal using other sensor signals. Noise components in input signals into the fuzzy neural network are removed through the wavelet denoising technique. Principal component analysis (PCA) is used to reduce the dimension of an input space without losing a significant amount of information. A lower dimensional input space will also usually reduce the time necessary to train a fuzzy-neural network. Also, the principal component analysis makes easy the selection of the input signals into the fuzzy neural network. The fuzzy neural network parameters are optimized by two learning methods. A genetic algorithm is used to optimize the antecedent parameters of the fuzzy neural network and a least-squares algorithm is used to solve the consequent parameters. The proposed algorithm was verified through the application to the pressurizer water level and the hot-leg flowrate measurements in pressurized water reactors

  17. 一种基于PCA-LDA的卫星遥感图像的分类方法%A CLASSIFICATION APPROACH FOR SATELLITE REMOTE SENSING IMAGE BASED ON PCA-LDA

    Institute of Scientific and Technical Information of China (English)

    赵蔷; 宋笑雪; 郭新明; 李红

    2013-01-01

    We propose a colour classification algorithm for satellite remote sensing images based on PCA-LDA, which integrates the features of components analysis (PCA) and linear discriminant analysis (LDA). The algorithm fuses the feature spaces of PCA and LDA algorithms to get the colour-fused feature space. The algorithm removes the correlation between R, G and B of the image, improves the light sensitivity and classifies the colours of the image using region classification-based spatial consistency principle. Experimental results demonstrate that the PCA-LDA-based algorithm is an effective method to classify the remote multi-frequency sensing image.%结合主成分分析PCA(Principal Components Analysis)和线性判别分析LDA(Linear Discriminant Analysis)的特点,提出一种基于PCA-LDA算法的卫星遥感图像色彩分类方法.该算法将PCA算法和LDA算法的特征空间相融合,得到融合颜色特征空间.该方法去除了图像的R、G、B之间的相关性,改善了光照敏感性,采用基于区域分类的空间一致性原则对图像进行颜色分类.实验结果表明,该方法是对多频谱遥感图像分类的一种有效的方法.

  18. Rule Based Identification of Cardiac Arrhythmias from Enhanced ECG Signals Using Multi-Scale PCA

    Directory of Open Access Journals (Sweden)

    K. Sharmila

    2013-09-01

    Full Text Available The detection of abnormal cardiac rhythms, automatic discrimination from rhythmic heart activity, became a thrust area in clinical research. Arrhythmia detection is possible by analyzing the electrocardiogram (ECG signal features. The presence of interference signals, like power line interference (PLI, Electromyogram (EMG and baseline drift interferences, could cause serious problems during the recording of ECG signals. Many a time, they pose problem in modern control and signal processing applications by being narrow in-band interference near the frequencies carrying crucial information. This paper presents an approach for ECG signal enhancement by combining the attractive properties of principal component analysis (PCA and wavelets, resulting in multi-scale PCA. In Multi-Scale Principal Component Analysis (MSPCA, the PCA’s ability to decorrelate the variables by extracting a linear relationship and wavelet analysis are utilized. MSPCA method effectively processed the noisy ECG signal and enhanced signal features are used for clear identification of arrhythmias. In MSPCA, the principal components of the wavelet coefficients of the ECG data at each scale are computed first and are then combined at relevant scales. Statistical measures computed in terms of root mean square deviation (RMSD, root mean square error (RMSE, root mean square variation (RMSV and improvement in signal to noise ratio (SNRI revealed that the Daubechies based MSPCA outperformed the basic wavelet based processing for ECG signal enhancement. With enhanced signal features obtained after MSPCA processing, the detectable measures, QRS duration and R-R interval are evaluated. By using the rule base technique, projecting the detectable measures on a two dimensional area, various arrhythmias are detected depending upon the beat falling into particular place of the two dimensional area.

  19. Classification of Photogrammetric Point Clouds of Scaffolds for Construction Site Monitoring Using Subspace Clustering and PCA

    Science.gov (United States)

    Xu, Y.; Tuttas, S.; Heogner, L.; Stilla, U.

    2016-06-01

    This paper presents an approach for the classification of photogrammetric point clouds of scaffolding components in a construction site, aiming at making a preparation for the automatic monitoring of construction site by reconstructing an as-built Building Information Model (as-built BIM). The points belonging to tubes and toeboards of scaffolds will be distinguished via subspace clustering process and principal components analysis (PCA) algorithm. The overall workflow includes four essential processing steps. Initially, the spherical support region of each point is selected. In the second step, the normalized cut algorithm based on spectral clustering theory is introduced for the subspace clustering, so as to select suitable subspace clusters of points and avoid outliers. Then, in the third step, the feature of each point is calculated by measuring distances between points and the plane of local reference frame defined by PCA in cluster. Finally, the types of points are distinguished and labelled through a supervised classification method, with random forest algorithm used. The effectiveness and applicability of the proposed steps are investigated in both simulated test data and real scenario. The results obtained by the two experiments reveal that the proposed approaches are qualified to the classification of points belonging to linear shape objects having different shapes of sections. For the tests using synthetic point cloud, the classification accuracy can reach 80%, with the condition contaminated by noise and outliers. For the application in real scenario, our method can also achieve a classification accuracy of better than 63%, without using any information about the normal vector of local surface.

  20. Estudo comparativo dos bloqueios intercostal e interpleural para analgesia pós-operatória em colecistectomias abertas Estudio comparativo de los bloqueos intercostal e interpleural para analgesia pós-operatoria en colecistectomias abiertas Comparative study of intercostal and interpleural block for post-cholecystectomy analgesia

    OpenAIRE

    Antonio Mauro Vieira; Taylor Brandão Schnaider; Antonio Carlos Aguiar Brandão; João Pires Campos Neto

    2003-01-01

    JUSTIFICATIVA E OBJETIVOS: A analgesia no pós-operatório é desejada pelos pacientes e tem sido praticada pela maioria dos anestesiologistas. Além dos opióides, os anestésicos locais têm sido utilizados nos bloqueios periféricos e centrais para se obter a analgesia pós-operatória. O objetivo deste estudo foi comparar duas técnicas de bloqueio dos nervos intercostais para analgesia pós-operatória em colecistectomias abertas. MÉTODO: Sessenta pacientes foram submetidos a colecistectomias abertas...