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Sample records for arsenazo previa extraccion

  1. Spectrophotometric determination of uranium with arsenazo previous liquid-liquid extraction and colour development in organic medium; Determinacion espectrofotometrica de uranio con arsenazo, previa extraccion y desarrollo del color en medio organico

    Energy Technology Data Exchange (ETDEWEB)

    Palomares Delgado, F.; Vera Palomino, J.; Petrement Eguiluz, J. C.

    1964-07-01

    The determination of uranium with arsenazo is hindered by a great number of cation which form stable complexes with the reactive and may given rise to serious interferences. By studying the optimum conditions of uranium the extraction be means of tributylphosphate solutions dissolved in methylisobuthylketone, under conditions for previous masking of the interfering cations, an organic extract was obtained containing all the uranium together with small amounts of iron. The possible interference derived from the latter element is avoided by reduction with hydroxylammoniumchlorid followed by complex formation of the Fe(II)-ortophenantroline compound in alcoholic medium. (Author) 17 refs.

  2. Method for determining microamounts of uranium in solutions from copper ores, by liquid-liquid extraction and spectrophotometry with arsenazo III.; Metodo para determinar microcantidades de uranio en disoluciones de minerales de cobre, por extraccion liquido-liquido y espectrofotometria con arsenazo III

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez, B.

    1972-07-01

    A spectrophotometric method is described for determining small amounts of uranium in aqueous solutions from copper ores. Uranium is quantitatively separated in a single extraction by a solution of tri-n-octylphosphine oxide in benzene, using ethylendiaminetetracetic acid and sodium fluoride as complexing agents, for improving the selectivity of the procedure. An aliquot of the extract is diluted with a hydrocolloidal solution of arsenazo III. Optical density is measured at 650 nm. (Author) 3 refs.

  3. Neptunium Binding Kinetics with Arsenazo(III)

    Energy Technology Data Exchange (ETDEWEB)

    Leigh R. Martin; Aaron T. Johnson; Stephen P. Mezyk

    2014-08-01

    This document has been prepared to meet FCR&D level 2 milestone M2FT-14IN0304021, “Report on the results of actinide binding kinetics with aqueous phase complexants” This work was carried out under the auspices of the Thermodynamics and Kinetics of Advanced Separations Systems FCR&D work package. The report details kinetics experiments that were performed to measure rates of aqueous phase complexation for pentavalent neptunium with the chromotropic dye Arsenazo III (AAIII). The studies performed were designed to determine how pH, ionic strength and AAIII concentration may affect the rate of the reaction. A brief comparison with hexavalent neptunium is also made. It was identified that as pH was increased the rate of reaction also increased, however increasing the ionic strength and concentration of AAIII had the opposite effect. Interestingly, the rate of reaction of Np(VI) with AAIII was found to be slower than that of the Np(V) reaction.

  4. Spectrophotometric determination of thorium using arsenazo III in water

    International Nuclear Information System (INIS)

    A spectrophotometric determination of thorium with arsenazo III (1,8 dihidroxynaphtaline - 3,6 sulfanic acid - 2,7 bis (azo-2) - phenil argonic acid) was carried out aiming to analyse this element in water. In order to eliminate possible interferences, a coprecipitation with lantanium fluoride was used followed by an extration with 0,2 M TTA (tenoil-trifluor - aceton) / Benzen. The results showed a good agreement with the ones obtained by alfa-spectrometry. (Author)

  5. Ultrasonography evaluations of placenta previa

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    Lee, Hak Seo; Yim, Neung Jae; Oh, Eun Ock [Korea General Hospital, Seoul (Korea, Republic of); Park, Soo Soung [Chung Ang University College of Medicine, Seoul (Korea, Republic of)

    1984-12-15

    Diagnostic ultrasound has become one of the most useful tools in the practice of obstetrics. It has been of particular utility in the placental localization. We analyzed 34 patients of placenta previa scanned by ultrasound. The results were as follows; 1. The age of patient ranged from 22 to 39 years, showing the highest incidence in 26 to 30 years. 2. The accuracy of correct localization was 70.6%. 3. Among 13 cases diagnosed by ultrasound as total placenta previa, 2 cases were partial placental previa and 1 was low-lying placenta at the time of delivery. 4. Among 9 cases diagnosed by ultrasound as partial placenta previa, 1 case was total placenta previa and 1 case was low-lying placenta and 1 case was upper segment placenta. 5. Among 10 cases diagnosed by ultrasound as low-lying placenta, 2 cases were partial placenta previa. 6. Among 2 cases diagnosed by ultrasound as upper segment placenta, 1 case was total placenta previa and 1 case was partial placenta previa. 7. Among 9 cases done serial ultrasound, 3 cases revealed that the placenta migrates toward fundus in the course of pregnancy. Therefore, the placental scanning should be repeated in the last month before term to decide the mode of delivery. Conclusively, ultrasonography is the imaging modality of choice in the evaluation of placenta localization because it provides speedy and repeatable way without any known risk to both mother and fetus itself. Careful performance and accurate interpretation should be needed for more correct placental localization.

  6. Abnormal Placentation: Placenta Previa, Vasa Previa, and Placenta Accreta.

    Science.gov (United States)

    Silver, Robert M

    2015-09-01

    Placental disorders such as placenta previa, placenta accreta, and vasa previa are all associated with vaginal bleeding in the second half of pregnancy. They are also important causes of serious fetal and maternal morbidity and even mortality. Moreover, the rates of previa and accreta are increasing, probably as a result of increasing rates of cesarean delivery, maternal age, and assisted reproductive technology. The routine use of obstetric ultrasonography as well as improving ultrasonographic technology allows for the antenatal diagnosis of these conditions. In turn, antenatal diagnosis facilitates optimal obstetric management. This review emphasizes an evidence-based approach to the clinical management of pregnancies with these conditions as well as highlights important knowledge gaps.

  7. Treatment of Arsenazo III contaminated heavy water stored at Darlington

    International Nuclear Information System (INIS)

    Darlington Nuclear Generating Station (DNGS) has accumulated over 48 drums of chemistry laboratory waste arising from analysis of heavy water (D2O). Several organic, including Arsenazo III, and inorganic contaminants present in these drums results in high total organic carbon (TOC) and conductivity. These drums have not been processed due to uncertainties related to clean-up of Arsenazo III contaminated heavy water. This paper provides details of chemical characterization as well as bench scale studies performed to demonstrate the feasibility of treating the downgraded D2O to the stringent target specifications of <1 ppm TOC and <0.1mS/m conductivity, required for feed to the Station Upgrading Plant (SUP). Both ionic organic species such as glycolate, acetate and formate as well as neutral organics such as acetone, methanol and ethylene glycol were detected in all the samples. Morpholine and propylene glycol were detected in one sample. Arsenazo III was determined to be not a major contaminant (maximum 8.4 ppm) in these waste drums, compared to the other organic contaminants present. Various unit processes such as pH adjustment, granular activated carbon (GAC), ion exchange resin (IX), UV-peroxide oxidation (UV-H2O2) treatments, nanofiltration (NF) as well as reverse osmosis (RO) were tested on a bench scale both singly as well as in various combinations to evaluate their ability to achieve the stringent target conductivity and TOC specifications. Among the various bench scale tests evaluated, the successive processing train used at DNGS and consisting of GAC+IX+UV/H2O2+IX (polishing) unit operations was found to meet target specifications for both conductivity and TOC. Unit processes comprising (GAC+IX) and (RO-double pass + GAC+IX) met conductivity targets but failed to meet TOC specifications. The results of GAC+IX tests clearly emphasize the importance of using low flow rates for successful reduction in both conductivity as well as TOC. Detailed assessment of

  8. Treatment of Arsenazo III contaminated heavy water stored at Darlington

    Energy Technology Data Exchange (ETDEWEB)

    Suryanarayan, S.; Husain, A., E-mail: sriram.s@kinectrics.com [Kinectrics Inc., Toronto, Ontario (Canada); Williams, D., E-mail: denny.williams@opg.com [Ontario Power Generation, Darlington Nuclear Generating Station, Bowmanville, Ontario (Canada)

    2010-07-01

    Darlington Nuclear Generating Station (DNGS) has accumulated over 48 drums of chemistry laboratory waste arising from analysis of heavy water (D{sub 2}O). Several organic, including Arsenazo III, and inorganic contaminants present in these drums results in high total organic carbon (TOC) and conductivity. These drums have not been processed due to uncertainties related to clean-up of Arsenazo III contaminated heavy water. This paper provides details of chemical characterization as well as bench scale studies performed to demonstrate the feasibility of treating the downgraded D{sub 2}O to the stringent target specifications of <1 ppm TOC and <0.1mS/m conductivity, required for feed to the Station Upgrading Plant (SUP). Both ionic organic species such as glycolate, acetate and formate as well as neutral organics such as acetone, methanol and ethylene glycol were detected in all the samples. Morpholine and propylene glycol were detected in one sample. Arsenazo III was determined to be not a major contaminant (maximum 8.4 ppm) in these waste drums, compared to the other organic contaminants present. Various unit processes such as pH adjustment, granular activated carbon (GAC), ion exchange resin (IX), UV-peroxide oxidation (UV-H{sub 2}O{sub 2}) treatments, nanofiltration (NF) as well as reverse osmosis (RO) were tested on a bench scale both singly as well as in various combinations to evaluate their ability to achieve the stringent target conductivity and TOC specifications. Among the various bench scale tests evaluated, the successive processing train used at DNGS and consisting of GAC+IX+UV/H{sub 2}O{sub 2}+IX (polishing) unit operations was found to meet target specifications for both conductivity and TOC. Unit processes comprising (GAC+IX) and (RO-double pass + GAC+IX) met conductivity targets but failed to meet TOC specifications. The results of GAC+IX tests clearly emphasize the importance of using low flow rates for successful reduction in both conductivity as

  9. In vitro photoacoustic sensing of calcium dynamics with arsenazo III

    Science.gov (United States)

    Dana, N.; Fowler, R. A.; Allen, A.; Zoldan, J.; Suggs, L.; Emelianov, S.

    2016-07-01

    Imaging of cellular electric potential via calcium-ion sensitive contrast agents is a useful tool, but current techniques lack sufficient depth penetration. We explore contrast-enhanced photoacoustic (PA) imaging, using Arsenazo III dye, to visualize cardiac myocyte depolarization in vitro. Phantom results show strong linearity of PA signal with dye concentration (R 2  >  0.95), and agree spectrally with extinction measurements with varying calcium concentration. Cell studies indicate a significant (>100-fold) increase in PA signal for dye-treated cells, as well as a 10-fold increase in peak-to-peak variation during a 30 s window. This suggests contrast-enhanced PA imaging may have sufficient sensitivity and specificity for depth-resolved visualization of tissue depolarization in real-time.

  10. Prenatal diagnosis of vasa previa.

    Science.gov (United States)

    Bręborowicz, Grzegorz H; Markwitz, Wiesław; Szpera-Goździewicz, Agata; Dera-Szymanowska, Anna; Ropacka-Lesiak, Mariola; Szymański, Piotr; Kubiaczyk-Paluch, Beata

    2015-01-01

    Vasa previa is a rare condition in which unsupported by the placenta, umbilical cord blood vessels runs within the placental membranes between internal os of the cervix and presenting part of the fetus. We report an antenatal diagnostic procedure and management of a patient with low-lying placenta and velamentous cord insertion near to the internal os with two large fetal blood vessels coursing between the internal cervical os and fetal presenting part. An elective cesarean section was performed at 36 weeks gestation.

  11. Spectrophotometric determination of zirconium in nickel-base alloys with Arsenazo III after separation by froth flotation

    International Nuclear Information System (INIS)

    0.02-0.1% of zirconium can be determined in nickel alloys by spectrophotometry with Arsenazo III after its separation from the sample solution by means of froth flotation using Arsenazo III and Zephiramine. Nickel, chromium and iron do not interfere. Analysis of standard alloys yielded a standard deviation of 2.2%. (orig.)

  12. Extracciones quimicas secuenciales de metales pesados. Aplicacion en ciencias geologicas

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    Mandado Collado, J. M.

    2002-12-01

    de extracción secuencial diferentes, sin haberse impuesto todavía uno de ellos como un método estándar plenamente aceptado. Las fracciones de metales pesados que comúnmente se suelen diferenciar en los sólidos mediante este tipo de metodologías son: intercambiable, asociada a carbonatos, asociada a óxidos Fe y Mn, asociada a materia orgánica y fracción residual. Los distintos protocolos existentes difieren en los reactivos empleados y también en las condiciones experimentales, todo ello dependiendo de los objetivos concretos del estudio a realizar. Las extracciones secuenciales han encontrado unos campos de aplicación muy amplios en las ciencias geológicas, sobre todo en los estudios de geoquímica ambiental en medios acuáticos (ríos, lagos, estuarios, en edafología y también en hidrología subterránea. Los protocolos de extracción secuencial adolecen, en conjunto, de una serie de problemas metodológicos de cierta envergadura y que han sido abordados por distintos autores, pudiendo destacar entre ellos la selectividad de los reactivos empleados, la propia definición operativa de estos métodos, la redistribución (o readsorción elemental, las condiciones experimentales bajo las que se pueden ejecutar los protocolos, la escasez de materiales sólidos de referencia y, derivados de este último problema, la dificultad de validación de los distintos métodos y la evaluación de su precisión. A pesar de todos estos inconvenientes metodológicos, los procedimientos de extracción secuencial constituyen en la actualidad la mejor aproximación para describir la asociación geoquímica de los elementos traza con las diferentes fracciones de los sólidos.

  13. Placenta previa percreta with bladder invasion

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    Siniša Šijanović

    2011-02-01

    Full Text Available A 43- year old woman, with ten previous deliveries and history of two cesarean sections was admitted to our Department at 32 weeks of gestation with massive vaginal hemorrhage from an ultrasound diagnosed placenta previa. An emergency cesarean section with vertical abdominal incision was performed. A healthy 2300 g female infant was delivered. Attempts to manually remove the placenta caused massive hemorrhage. The lower uterine segment was widened due to placenta previa with suspicious placental invasion of the posterior wall of the bladder. Persistent hemorrhage demanded bilateral anterior internal iliac artery ligation and suture ligation of the bleeding vessels with supracervical hysterectomy done.

  14. Spectrophotometric determination of uranium and thorium with arsenazo III in the flow injection system

    International Nuclear Information System (INIS)

    A simple system for flow injection analysis (FIA) with double confluence was built using a filter photocolorimeter, an analogic potentiometer, 'plexiglass' flow cuvettes, polyethylene colls and tubes, 'plexiglass' commuter and peristaltic pump to introduce solutions and gravity as flow source. The system was dimensioned and studied using only Arsenazo III solutions. Spectrophotometric methods for uranium and thorium using Arsenazo III were studied using a scanning spectrophotometer and after chosing adequate red filter, adapted to photocolorimetry using flow cuvettes and FIA. Synthetic samples, phosphate rock, and process samples from uranium recovery of dolomites were analysed. Rocks of Morro do Ferro (MG, Brazil), Caldasite (Baddeleyte + Zirconite), Zirconite, Monazite from a program for certification and certified rocks (Dunite DC-1, CANMET) were analysed without chemical separation of Th (IV) and with ion exchange separation in semi-micro columns of cation exchange resin (Dowex 50). (Author)

  15. Extraccion de aceite de coco a partir de la copra por medio de disolventes quimicos

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    J. Rosario Rivera Hernández

    2001-01-01

    Full Text Available Acetato de Etilo, alcohol Isopropílico, Hexano, Tetracloruro de carbono y xileno, fueron usados como disolventes para extraer de la copra aceite de coco. Se aplicaron dos procedimientos de extracción sólido-líquido a la temperatura de ebullición de los disolventes, así mismo se efectuaron tres corridas de extracción a tiempos de 1.0, 1.5 y 2.0 hrs. los resultados de las extracciones aparecen en las tablas 1 y 2.

  16. Risk Factors of Neonatal Anemia in Placenta Previa

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    Dong Gyu Jang, Yun Sung Jo, Sung Jong Lee, Gui Se Ra Lee

    2011-01-01

    Full Text Available Objectives: Placenta previa is a major cause of neonatal anemia. The purpose of this study was to elucidate the risk factors of neonatal anemia in placenta previa.Methods: The study was conducted on 158 placenta previa patients at 3 hospitals in affiliation with the Catholic Medical Center, Seoul, Korea from May 1999 through December 2009. The subjects were divided in to 2 groups: 47 placenta previa patients with neonatal anemia, and 113 placenta previa patients without neonatal anemia. The subjects' characteristics were compared. Logistic regression was used to control for confounding factors.Results: Anterior placental location (OR 2.48; 95% CI: 1.20-5.11 was an independent risk factor of neonatal anemia after controlling for potential confounders.Conclusion: To manage neonatal anemia in placenta previa patients, obstetricians should do their best to detect placental location. Pediatricians should consider the high possibility of neonatal anemia in cases involving anterior placental location.

  17. Color-Fading Spectrophotometric Determination of Cerium with DBC-Arsenazo

    Institute of Scientific and Technical Information of China (English)

    翟庆洲; 张晓霞

    2004-01-01

    In the medium of 0.18~1.08 mol·L-1 sulfuric acid, cerium(Ⅳ) has the color-fading effect on DBC-arsenazo. The apparent molar absorptivity of the color-fading reaction is ε530 nm=1.03×104 L·mol-1·cm-1. Beer′s law is obeyed over the range of 1.20~12.0 μg·ml-1 of Ce (Ⅳ) which shows a linear relationship with the decrease in the absorbance of the colored solution. The effect of thirty-six coexisting ions was studied. The method was applied to the determination of the trace amount of cerium in water samples and has the advantage of high accuracy and good selectivity.

  18. Obstetric complications of placenta previa percreta

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    Sparić Radmila

    2014-01-01

    Full Text Available Introduction. Placenta previa is related to severe maternal and fetal morbidity. The increasing incidence of cesarean delivery rate causes a marked increase in abnormally invasive placenta over the past decades. The abnormally invasive placenta is becoming the foremost cause of obstetric hemorrhage and postpartum hysterectomy, causing a significant maternal and fetal morbidity and even mortality. Maternal morbidity in such cases also comprise politransfusion, development of disseminated intravascular coagulation, uterine rupture, cystostomy, fistula formation, ureteral stricture, intensive care unit admission, infection, and prolonged hospitalization, adult respiratory distress syndrome, renal failure, septicemia and even death. Case report. A 38-year-old gravida 3, para 2, was admitted to our hospital at 27 weeks of gestation as an emergency due to vaginal bleeding, previously diagnosed with an anterior placenta previa. Following tocolytic therapy, bleeding stopped. The patient was informed on the diagnosis and the possibility of lifethreatening hemorrhage necessitating preterm delivery. She was given corticosteroids to enhance fetal lung maturity. At 28 weeks of gestation, she experienced massive vaginal bleeding, and a decision was made to perform emergency cesarean section. We made a corporeal transverse uterine incision well above the uterovesical fold and tortuous vessels, at the same time avoiding the superior edge of the placenta. The placenta was found to be densely adherent to the lower uterine segment, penetrating through it and infiltrating the posterior wall of the urinary bladder. An attempt to remove the placenta resulted in injury to the bladder wall and the uterine rupture at a previous cesarean scar. The decision was made to perform total abdominal hysterectomy with placenta left in situ. At present, both mother and the baby are well. Conclusion. Anticipation and the surgeon's judgment are leading factors for surgery, from the

  19. A case report of vasa previa incidentally discovered.

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    Saghir, Salahiddine; Kouach, Jaouad; Agadr, Aomar

    2015-01-01

    Vasa previa is a rare but clinically important obstetrical complication that can be associated with a low-lying placenta or placenta previa. We aim to present one case of vasa previa diagnosed during the placenta examination after the caesarean indicated for triple uterus scar. A 26-year-old female was referred to our hospital at 30 weeks of gestation to provide a scheduled caesarean. Trans-abdominal ultrasound was performed; the placenta was positioned in the posterior side of the fundus. Fetal growth was found to be appropriate for gestational age. A healthy male infant weighing was successfully delivered via cesarean section at 38 weeks of gestation. This operation helped to prevent complications due to acute fetal bleeding. The identification and exclusion of vasa previa using trans-vaginal ultrasound are essential to ensure appropriate and timely treatment.

  20. Prevalence of placenta previa among deliveries in Mainland China

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    Fan, Dazhi; Wu, Song; Wang, Wen; Xin, Lihong; Tian, Guo; Liu, Li; Feng, Jinping; Guo, Xiaoling; Liu, Zhengping

    2016-01-01

    Abstract Background: Placenta previa is characterized by the abnormal placenta overlying the endocervical os, and it is known as one of the most feared adverse maternal and fetal-neonatal complications in obstetrics. Objectives: We aimed to obtain overall and regional estimates of placenta previa prevalence among deliveries in Mainland China. Methods: The research was performed a systematic review, following the Meta-analysis of observational studies in epidemiology (MOOSE) guidelines for systematic reviews of observational studies, and the preferred reporting items for systematic reviews and meta-analysis (PRISMA) statement for reporting systematic reviews and meta-analysis. Electronic databases were searched and included hospital-based studies that reported placenta previa prevalence in Mainland China. Random-effects meta-analyses were used to pool prevalence estimates of placenta previa. Meta-regression analyses were performed to explore sources of heterogeneity across the included studies. For exploring the geographical distributions of placenta previa, the ArcGIS software (Esri) was used to construct the map of prevalence. Results: A total of 80 articles and 86 datasets (including 1,298,548 subjects and 14,199 placenta previa cases) from 1965 through 2015 were included. The pooled overall prevalence of placenta previa among deliveries was 1.24% (95% confidence interval [CI], 1.12–1.36) in Mainland China during 1965 to 2015. And, the trend in the prevalence of placenta previa was steady. The occurrence rate of placenta previa in the region groups Northeast, North, Northwest, Central China, East, South, and Southwest was 1.20%, 1.01%, 1.10%, 1.15%, 0.93%, 1.42%, and 2.01%, respectively. The prevalence map based on a geographic information system showed an unequal geographic distribution. Conclusions: The results showed that placenta previa is currently a high-burden disease in Mainland China. This review would be useful for the design of placenta previa

  1. Extraction/spectrophotometric determination of trace amounts of zirconium in niobium bearing steels using Arsenazo III

    International Nuclear Information System (INIS)

    A spectrophotometric method with Arsenazo III combined the extraction of Zr by thenoyltrifluoroacetone (TTA)-xylene was studied for the determination of trace amounts of Zr in Nb-containing steels and Ni-base alloys. Sample (0.5 g or 0.1 g) was dissolved in 10 ml of aqua regia, 2 ml of hydrofluoric acid and 15 ml of perchloric acid by heating, and the solution was evaporated until all perchloric acid fumes were expelled. After cooling, the salts were dissolved by adding 1 ml of hydrochloric acid and 2.0 ml sufuric acid (9 M) and by heating. The solution was evaporated until fumes of perchloric acid were visible. After cooling, the salts were dissolved by adding 20 ml of hydrochloric acid (4 M) and by heating. L-Ascoribic acid (0.5 g per 0.1 g of sample) was added for reduction of ferric ion and the solution was adjusted to 50 ml with hydrochloric acid (4 M). Zirconium was extracted into 10 ml of TTA (0.5 M)-xylene solution and then back-extracted into 10 ml of hydrofluoric acid (0.4 M)-nitric acid (0.4 M) mixture. The organic phase was washed with 5 ml of the acids mixture. The sample and washing solutions with 1 ml of nitric acid and 15 ml of perchloric acid were evaporated below 1 ml by heating. After cooling, 30 ml of nitric acid was added and the sample solution was heated just before boiling and cooled. After the sample solution was adjusted to 40 ml with water, 2.5 ml of urea solution (10 g/l) and 5.0 ml of Arsenazo III solution (1.5 x 10-3 M) were added and the solution was adjusted to 50.0 ml with water. Absorbance of the solution was measured at 670 nm with 10mm quartz cell against reagent blank. Niobium up to 3 mg did not interfere; at 4 mg Nb caused slightly negative error. The relative standard deviations were 3 % and 0.8 % for 0.004 % and 0.02 % of Zr content respectively. The limit of determination minimum by this method was 0.0004 %. (author)

  2. Catalytic Spectrophotometry for Vanadium Determination Based on Oxidation of Arsenazo Ⅲ by Bichromate

    Institute of Scientific and Technical Information of China (English)

    1999-01-01

    A catalytic spectrophotometry for the determination of trace amount of vanadium was developed based on its catalytic effect on the oxidation of arsenazo Ⅲ by potassium bichromate in weak acidic medium. The optimized conditions for determinations are: cK2Cr2O7=3.0×10-5 mol·L-1, carsenazo Ⅲ=3.0×10-5 mol·L-1, pH=4.0, t=90℃. The calibration graph is linear for 0.02~0.2 μg·ml-1, and the detection limit is 0.02 μg·ml-1 V. The apparent active energy of this catalytic reaction is 21.72 kJ·mol-1. Most foreign ions do not interfere with the determination of vadadium, except for Fe(Ⅱ) and Co(Ⅱ), and their interferences could be eliminated by ion exchange. The present method has been used to make the determination of vanadium in human hair, tea, potato and wastewater, and the results were satisfactory.

  3. RISK FACTORS OF PLACENTA PREVIA AMONG RURAL INDIAN WOMEN

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    Santu

    2014-11-01

    Full Text Available OBJECTIVE: The present study was to find out risk factors of placenta previa among rural Indian women. METHODS: This was a retrospective observational study conducted over two years. 220 women with placenta previa were taken as cases and 440 women without placenta previa were taken as control. RESULTS: Advanced maternal age (OR 2.7; 95% CI: 1.84-3.97, increased parity (OR 1.58; 95% CI: 1.13-2.22, previous abortions (OR 2.25; 95% CI: 1.5-3.35, previous uterine surgery (OR 5.91; 95% CI: 3.56-9.87, uterine anomalies (OR 4.64; 95% CI: 1.41-15.27 and tobacco chewing (OR 3.58; 95% CI: 1.04-12.37 are the potential risk factors. No significant associations have been found with socio economic status, religion, previous history of placenta previa, infertility treatment and sex of the newborn. CONCLUSION: Placenta previa have some identifiable risk factors. Tobacco chewing is a novel potential risk factor

  4. Properties of the metallochromic dyes Arsenazo III, Antipyrylazo III and Azo1 in frog skeletal muscle fibres at rest.

    Science.gov (United States)

    Baylor, S M; Hollingworth, S; Hui, C S; Quinta-Ferreira, M E

    1986-08-01

    Intact single twitch fibres from frog muscle were isolated and mounted in a normal Ringer solution (16 degrees C) on an optical bench apparatus for measuring fibre absorbance as a function of the wave-length and polarization of the incident light. Fibre absorbance was measured in resting fibres both in the absence and in the presence of one of three metallochromic dyes: Arsenazo III, Antipyrylazo III and Azo1. In the absence of dye, the fibre intrinsic absorbance, Ai(lambda), measured as a function of wave-length, lambda, was well described by the equation: Ai(lambda) = Ai(lambda long) (lambda long/lambda)X, where lambda long is a reference wave-length selected to lie beyond the absorbance band of the dyes and X is the exponential index. For wave-lengths between 480 and 810 nm, the average value of X was 1.1 for 0 deg polarized light (electric vector parallel to the fibre axis) and 1.3 for 90 deg polarized light (electric vector perpendicular to the fibre axis). The intrinsic absorbance at 0 deg, Ai,0(lambda), was somewhat larger than the intrinsic absorbance at 90 deg, Ai,90(lambda); for example, on average (n = 6), Ai,0 (810 nm) was 0.22, whereas Ai,90 (810 nm) was 0.016. Following dye injection, dye-related absorbance was estimated from the measured total fibre absorbance by subtracting the component attributable to the intrinsic absorbance; additionally, for comparison with in vitro calibrations as a function of wave-length, myoplasmic dye absorbance was corrected for the steady change in dye-concentration with time that was attributable to dye diffusion. In fibres injected with either Arsenazo III or Antipyrylazo III, the dye-related absorbance measured with 0 deg light, A0(lambda), was found to be significantly greater than that measured with 90 deg light, A90(lambda), indicating the presence of a resting 'dichroic' signal, A0(lambda)-A90(lambda), attributable to bound and oriented dye molecules. On average, the lower limit estimated for the percentage of

  5. Placenta previa: outcomes in scarred and unscarred uterus

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    Rajshree Dayanand Katke

    2016-08-01

    Conclusions: In conclusion, primary prevention in the form of reduction in the rate of primi cesearean section must be done in order to prevent likelihood of placenta previa in scarred uteri. Early diagnosis by Ultrasound and planned delivery should be the goal. [Int J Reprod Contracept Obstet Gynecol 2016; 5(8.000: 2728-2732

  6. Simultaneous determination of uranium and plutonium at trace levels in process streams using Arsenazo III by derivative spectrophotometry

    International Nuclear Information System (INIS)

    A derivative spectrophotometric method has been developed for the simultaneous determination of uranium and plutonium at trace levels in various process streams in 3M HNO3 medium using Arsenazo III. The method was developed with the objective of measuring both uranium and plutonium in the same aliquot in fairly high burn-up fuels. The first derivative absorbances of the uranium and plutonium Arsenazo III complexes at 632 nm and 606.5 nm, respectively, were used for their quantification. Mixed aliquots of uranium (20-28 μg/ml) and plutonium (0.5-1.5 μg/ml) with U/Pu ratio varying from 25 to 40 were analysed using this technique. A relative error of about 5% was obtained for uranium and plutonium. The method is simple, fast and does not require separation of uranium and plutonium. The effect of presence of many fission products, corrosion products and complexing anions on determination of uranium and plutonium was also studied. (author)

  7. Clinical Analysis of Placenta Previa Complicated with Previous Caesarean Section

    Institute of Scientific and Technical Information of China (English)

    Liang-kun Ma; Na Han; Jian-qiu Yang; Xu-ming Bian; Jun-tao Liu

    2012-01-01

    Objective To investigate the clinical features and treatment of placenta previa complicated with previous caesarean section.Methods The clinical data of 29 patients with placenta previa complicated with a previous caesarean section (RCS group) admitted in Peking Union Medical College Hospital during a period from 2003 to 2011 were retrospectively reviewed and compared with those of 243 patients with placenta previa without a previous caesarean section (FCS group) during the same period.Results There was no difference in the mean age (28.9±3.6 vs.28.1±4.5 years) and the average gravidity (2.35 ± 1.48 vs.2.21 ± 1.53) between RCS group and FCS group (all P>0.05).The RCS group had more preterm births (24.1% vs.13.2%),complete placenta previa (55.2% vs.4.9%),placenta accreta (34.5% vs.2.5%),more blood loss during caesarean section (1412±602 vs.648 ±265 mL),blood transfusion (51.7% vs.4.9%),disseminated intravascular coagulation (13.8% vs.2.1%),and obstetric hysterectomy ( 13.8 % vs.0.8 %) than the F C S group (all P< 0.05).The preterm infant rate ( 30.0% vs.13.0%),neonatal asphyxia rate (10.0% vs.4.9%),and perinatal mortality rate (6.7% vs.0.4%) of the RCS group were higher than those of the FCS group (all P<0.05).Conclusions More patients had complete placenta previa and placenta accreta,postpartum hemorrhage,transfusion,uterine packing,obstetric hysterectomy,and perinatal morbidity in the placenta previa patients with previous caesarean section.The patient should be informed of the risk and unnecessary first cesarean sections should be avoided.

  8. Direct Spectrophotometric Determination of the Total Amount of Light Rare Earths with Arsenazo-DBS as a Chelator

    Institute of Scientific and Technical Information of China (English)

    Yuan Fuzhen

    1999-01-01

      A direct spectrophotometric method for the determination of the total light rare earths has been developed. In this method, arsenazo-DBS is used as a chelating agent with light rare earth elements in strong acidic medium (0.04-0.48 mol l-1 of acidity). The concentrations of total rare earths in 0-15 μg /(25 ml) range can be determined accurately by this method. An absorption maximum was observed at 630 nm at which a molar absorptivity of 1.14x105 l mol-1 cm-1 was determined. The method offers high selectivity and good sensitivity towards light rare earths and features simplicity and rapidity in operation. It has been applied to the determination of light rare earths in cast iron and Ni-Fe alloys.

  9. MATERNAL AND PERINATAL OUTCOME IN PREGNANCIES COMPLICATED BY PLACENTA PREVIA

    Directory of Open Access Journals (Sweden)

    Rajendra

    2015-06-01

    Full Text Available AIMS AND OBJECTIVES: To evaluate the maternal and perinatal outcome of pregnancies complicated with placenta previa at tertiary care centre and to evaluate the potential risk factors involved in pregnancies complicated with placenta previa at tertiary care C ent re. METHOD: We carried out 2 year retrospective observational study during period from November 2009 to October 2011 Tertiary care hospital and medical college. ANC cases with history of bleeding per vaginum after 28 weeks attending ANC clinic and emergenc y ward were included in study with appropriate age parity matched controls with other complications like pregnancy induced hypertension, abruption placentae, multiple gestation were excluded. Demographic data, medical and surgical histories, all the events regarding maternal and perinatal mortality were recorded. Data was analysed by using appropriate software . RESULTS: 136 cases of placenta previa were analysed and found prevalence of placenta previa was 1.36%. During the present study 41.80% cases were bo oked and 58.20% cases were unbooked. Maximum number of cases in present study were in the age group of 18 - 24 years. Previous caesarean (57.49% and previous abortion (42.53% found important risk factors.41.04% cases were delivered at 33 - 36 weeks of gestat ion followed by 33.58% in 28 - 32 weeks of gestation. Expectant management was given to 37.32% of cases while 62.68% cases were managed on active basis. In present study maternal morbidity were postpartum hemorrhage (56.71%, sepsis (37.31%, urinary tract i nfection (5.22%, wound infection (5.22%,wound gape (4.47%, hysterectomy (2.23%, prolonged hospital stay >10 days (17.91%. There were two (1.49% maternal mortality in present study. Maximum number of infants i.e . 58.20% had bir th eight between 1.6 to 2.4kg. O ut of this 16.41% were of 1.6 - 2kg and 41.79% comprised of 2.1 - 2.4 kg. 39.55% infant required NICU admission and 60.45% of cases were with mother. Perinatal

  10. Method for determining microamounts of uranium in solutions from copper ores, by liquid-liquid extraction and spectrophotometry with arsenazo III

    International Nuclear Information System (INIS)

    A spectrophotometric method is described for determining small amounts of uranium in aqueous solutions from copper ores. Uranium is quantitatively separated in a single extraction by a solution of tri-n-octylphosphine oxide in benzene, using ethylendiaminetetracetic acid and sodium fluoride as complexing agents, for improving the selectivity of the procedure. An aliquot of the extract is diluted with a hydrocolloidal solution of arsenazo III. Optical density is measured at 650 nm. (Author) 3 refs

  11. Influence of placental position on obstetric morbidity in placenta previa

    Directory of Open Access Journals (Sweden)

    Shripad S. Hebbar

    2014-06-01

    Conclusions: It is difficult to assign a maternal or perinatal morbidity risk to a particular type of placental location. The need for specialized surgical intervention such as uterine / internal iliac artery ligation, peripartum hysterectomy can arise irrespective of placental location, whether underneath the surgical incision (anterior, proximity to main uterine trunks (lateral or encountered after the delivery of the baby (posterior. Pregnancies complicated by placenta previa must be delivered in the hospitals having expertise of senior and skilled surgeons and well equipped blood bank and good neonatal intensive care unit. [Int J Reprod Contracept Obstet Gynecol 2014; 3(3.000: 585-591

  12. Doce años de extracciones de catéteres endocavitarios de marcapasos y desfibriladores en la Argentina

    Directory of Open Access Journals (Sweden)

    Héctor A. Mazzetti

    2006-01-01

    Full Text Available RESUMEN La extracción de catéteres de marcapasos fue una práctica habitual desde que se implantó el primer marcapasos en 1958. Se presenta la experiencia sobre extracciones de catéteres por vía percutánea de 609 catéteres de marcapasos y desfibriladores, desde julio de 1993 hasta julio de 2005. La indicación más frecuente fue por infección (decúbitos y endocarditis bacteriana asociada con marcapasos. Se utilizaron distintas vías de abordaje: vena cava superior (la más frecuente, vena cava inferior, transyugular interna y transauricular. Los catéteres con mayor tiempo de implantados necesitaron del sistema de extracción con más frecuencia que los catéteres más nuevos. Los catéteres de desfibrilador tuvieron menos tiempo de implantados y requirieron el material de extracción un número mayor de veces. La eficacia fue superior al 99%. El procedimiento tiene riesgos de complicaciones que incluyen la muerte. Sin embargo, con un entrenamiento apropiado, material adecuado y experiencia en el procedimiento se puede llevar a cabo con una excelente tasa de éxito.

  13. Maternal Outcomes According to Placental Position in Placental Previa

    Directory of Open Access Journals (Sweden)

    Dong Gyu Jang, Ji Sun We, Jae Un Shin, Yun Jin Choi, Hyun Sun Ko, In Yang Park, Jong Chul Shin

    2011-01-01

    Full Text Available Purpose: The purpose of this retrospective cohort study was to elucidate whether the location of placenta below uterine incision in cesarean section is important in the development of maternal complications in placenta previa patients.Methods: The study was conducted on 409 patients 414 parturition at 3 hospitals in affiliation with the Catholic Medical Center, Seoul, Korea from May 1999 to December 2009. The subjects were divided to two groups: the group whose placenta was located in the anterior portion of the uterus (anterior group and the group whose placenta was located in the posterior portion of the uterus (posterior group. And then they are compared to each other. Logistic regression was used to control for confounding factors.Results: In the anterior group, regardless of confounding factors, the incidence of excessive blood loss (OR 2.97; 95% CI: 1.64-5.37, massive transfusion (OR 3.31; 95% CI: 1.33-8.26, placental accreta (OR 2.60, 95% CI: 1.40-4.83, and hysterectomy (OR 3.47, 95% CI: 1.39-8.68 was higher.Conclusion: Sonographic determination of the placental position where its location beneath the uterine incision is very important to predict maternal outcomes in placenta previa patients, and such cases, close attention should be paid for massive hemorrhage.

  14. A danish national cohort study on neonatal outcome in singleton pregnancies with placenta previa

    DEFF Research Database (Denmark)

    Nørgaard, Lone N; Pinborg, Anja; Lidegaard, Ojvind;

    2012-01-01

    Objective. To describe the incidence of placenta previa and to assess neonatal morbidity and mortality in pregnancies with placenta previa after adjustment for previous cesarean section, smoking, multiparity, maternal age and in-vitro fertilization. Design. National cohort study. Setting. Danish...... national IVF-, birth- and patient registers. Population. All pregnancies in Denmark from 1978-2006 and a subpopulation of all singleton pregnancies during the years 2001-2006 with placenta previa (n= 1721) compared to pregnancies without this diagnosis. Method. Incidence rates and multivariate analysis....... Main outcome measures. Gestational age, birthweight, Apgar score after 5min, stillbirth, neonatal mortality and admittance to neonatal intensive care unit. Results. The incidence of placenta previa in Denmark was 0.54% in 2006. Neonates born after pregnancies with placenta previa had a higher risk...

  15. Automatización del control del cálculo de extracciones en la mina de la empresa niquelera Ernesto Che Guevara

    Directory of Open Access Journals (Sweden)

    Arístides A. Legrá-Lobaina

    2010-03-01

    Full Text Available En el artículo se muestran los elementos fundamentales de un algoritmo cuyo objetivo es establecer el contenido y el orden de los procedimientos necesarios para realizar el control del cálculo de extracciones en la mina de la empresa Ernesto Che Guevara que explota, a cielo abierto, yacimientos lateríticos ferroniquelíferos en la región de Moa, Cuba. Asimismo se presenta el diseño de los diálogos informáticos que han automatizado el algoritmo en la aplicación informática Tierra.

  16. Intraoperative bleeding control during cesarean delivery of complete placenta previa with transient occlusion of uterine arteries.

    Science.gov (United States)

    Kim, Ju Hyun; Joung, Eun-Ju; Lee, Soo-Jung; Kwack, Jae Young; Kwon, Yong Soon

    2015-11-01

    There are few methods to control heavy intra-operative bleeding during cesarean delivery of placenta previa. Transient occlusion of uterine arteries (TOUA) during operation has previously been reported as a quick and safe method to control intra-operative uterine bleeding. We reported 2 cases of cesarean delivery with complete placenta previa in which TOUA was performed to safely reduce intra-operative complication, especially heavy intra-operative bleeding. In the 2 cases, cesarean deliveries were safe and without any complications under the TOUA method. TOUA can be a good method to control heavy intra-operative bleeding during cesarean delivery of complete placenta previa with risk of heavy bleeding.

  17. STUDY ON ENRICHMENT AND SEPARATION OF TRACE Pd(Ⅱ) WHITH SILICA GEL BONDED BY (BENZOYLAZO—ARSENAZO I)—AMINOPROPYL

    Institute of Scientific and Technical Information of China (English)

    LIUFeng; LIKean; 等

    1992-01-01

    This Paper reports enrichment and sepqration of trace Pd(Ⅱ)with silica gel bonded by (benzolyazo-arsenazo I)-aminopropyl(BAAI·SG).BAAI·SG is stable in solution between 6 mol/L HCl and pH 9.0.The maximum adsorptive capacities of BAAI·SG and SG are 52.7,23.5μmol/g respectively.After preconcentration through BAII·SG column,Pd(Ⅱ)of ppb level in artificial water samples can be measured by spectrophotometry.

  18. A Case of Vaginal Stillbirth in the Presence of Placenta Previa at 33 Weeks of Gestation

    Science.gov (United States)

    Chinen, Yukiko; Kinjo, Tadatsugu; Nitta, Hayase; Kinjo, Yui; Masamoto, Hitoshi

    2016-01-01

    It was demonstrated that second- and third-trimester therapeutic termination of pregnancy (TOP) is feasible in cases with placenta previa. We report a 34-year-old woman with complex fetal malformations associated with placenta previa. An ultrasound examination at 21 weeks of gestation revealed fetal growth restriction (FGR) and complex fetal malformations associated with a placenta previa. After extensive information, the parents opted for careful observation. Thereafter, FGR gradually progressed and we observed arrest of end-diastolic velocity of the umbilical artery. Finally, intrauterine fetal death (IUFD) was confirmed at 33 weeks of gestation. Two days after IUFD, the patient experienced labor pain. The placenta and dead fetus weighing 961 g were vaginally delivered, and total bleeding was 270 mL. Although further studies to confirm the dynamic change of the uteroplacental blood flow are necessary to avoid the risk of maternal hemorrhage, vaginal TOP with placenta previa after feticide or IUFD would be feasible.

  19. A Case of Vaginal Stillbirth in the Presence of Placenta Previa at 33 Weeks of Gestation.

    Science.gov (United States)

    Chinen, Yukiko; Kinjo, Tadatsugu; Nitta, Hayase; Kinjo, Yui; Masamoto, Hitoshi; Aoki, Yoichi

    2016-01-01

    It was demonstrated that second- and third-trimester therapeutic termination of pregnancy (TOP) is feasible in cases with placenta previa. We report a 34-year-old woman with complex fetal malformations associated with placenta previa. An ultrasound examination at 21 weeks of gestation revealed fetal growth restriction (FGR) and complex fetal malformations associated with a placenta previa. After extensive information, the parents opted for careful observation. Thereafter, FGR gradually progressed and we observed arrest of end-diastolic velocity of the umbilical artery. Finally, intrauterine fetal death (IUFD) was confirmed at 33 weeks of gestation. Two days after IUFD, the patient experienced labor pain. The placenta and dead fetus weighing 961 g were vaginally delivered, and total bleeding was 270 mL. Although further studies to confirm the dynamic change of the uteroplacental blood flow are necessary to avoid the risk of maternal hemorrhage, vaginal TOP with placenta previa after feticide or IUFD would be feasible.

  20. Clinical study of placenta previa and its effect on maternal health and fetal outcome

    Directory of Open Access Journals (Sweden)

    Sarojini

    2016-10-01

    Conclusions: Advancing maternal age, multiparity, prior cesarean section, and prior abortions are independent risk factors for placenta previa. Placenta praevia remains a risk factor for adverse maternal and perinatal outcome. The detection of placenta previa should encourage a careful evaluation with timely delivery to reduce the associated maternal and perinatal complications. [Int J Reprod Contracept Obstet Gynecol 2016; 5(10.000: 3496-3499

  1. 偶氮胂-Ⅲ光度法测定烟草中的钙%Spectrophotometric Determination of Calcium in Tobacco with Arsenazo-Ⅲ

    Institute of Scientific and Technical Information of China (English)

    刘巍; 李忠; 刘思远; 王岚; 杨光宇

    2001-01-01

    本文研究了偶氮胂-Ⅲ与钙的显色反应,在pH=8.5氯化铵-氨水缓冲液介质中,乳化剂-OP存在下,偶氮胂-Ⅲ与钙反应生成1∶1稳定络合物,λmax=680nm,ε=2.13×104L*mol-1*cm-1。钙含量在0—30μg/25mL范围内符合比耳定律,该方法用于烟草样品中钙含量的测定,结果令人满意。%Color reaction of calcium(Ⅱ) with arsenazo-Ⅲ was studied.In the presence of pH=8.5 buffer solution and emulgent-OP medium arsenazo-Ⅲ can react with calcium(Ⅱ) to form a stable 1∶1 complex.The molar absorptivity is 2.13×104L*mol-1*cm-1 at 680nm.Beer's law is obeyed in the range of 0—30μg/25mL.This method can be applied to the determination of calcium in tobacco with satisfactory results.

  2. PROYECTOS Y CONFLICTOS EN RELACIÓN CON LA CONSULTA PREVIA

    OpenAIRE

    Gloria Amparo Rodríguez

    2011-01-01

    Este documento analiza la relación entre los proyectos de desarrollo, los cuales son autorizados mediante licencias ambientales en nuestro país, y los conflictos en relación con el derecho fundamental a la consulta previa que tienen los pueblos indígenas y demás grupos étnicos y los cuales han terminado por ser resueltos ante los estrados judiciales. Este artículo está orientado a establecer los requisitos mínimos que debe tener la consulta previa para su implementación y garantía de los dere...

  3. Ultrasonographic diagnosis of placenta previa: comparison between transabdominal and transperineal ultrasonography

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Jin Wook; Byun, Woo Mok; Hwang, Mi Soo; Chang, Jae Chun; Park, Bok Hwan; Cho, Kil Ho; Lee, Tae Hyeung [Yeungnam University College of Medicine, Daegu (Korea, Republic of)

    1994-12-15

    Sometimes, the diagnosis of placenta previa by transabdominal ultrasonography may be difficult, especially in the third trimester of pregnancy, because of obscuration of internal os of the cervix by overlying placenta as advancing pregnancy. In such situations, however, the transperineal ultrasonography may offer an additional view of internal os of the cervix without obscuration by overlying fetal parts or placenta. We evaluated forty pregnant women in whom placenta previa were suspected clinically, with both transabdominal and transperineal ultrasonography. The menstrual age at the time of ultrasonography, ranged from 27 to 36 weeks. We compared the diagnostic accuracy of each procedure with the final diagnosis at the time of delivery. Transabdominalul trasonography provided to correct diagnosis in 25 cases. In remaining 15 cases, the confident diagnosis could not be made because of poor visualization of internal os of the cervix. However, transperineal ultrasonography provided the correct diagnosis in all 40 cases. We conclude that the transperineal ultrasonography is relatively easy and convenient technique and valuable for detection of placenta previa, especially when the diagnosis of placenta previa is difficult by transabdominal ultrasonography

  4. A Case of Vaginal Stillbirth in the Presence of Placenta Previa at 33 Weeks of Gestation.

    Science.gov (United States)

    Chinen, Yukiko; Kinjo, Tadatsugu; Nitta, Hayase; Kinjo, Yui; Masamoto, Hitoshi; Aoki, Yoichi

    2016-01-01

    It was demonstrated that second- and third-trimester therapeutic termination of pregnancy (TOP) is feasible in cases with placenta previa. We report a 34-year-old woman with complex fetal malformations associated with placenta previa. An ultrasound examination at 21 weeks of gestation revealed fetal growth restriction (FGR) and complex fetal malformations associated with a placenta previa. After extensive information, the parents opted for careful observation. Thereafter, FGR gradually progressed and we observed arrest of end-diastolic velocity of the umbilical artery. Finally, intrauterine fetal death (IUFD) was confirmed at 33 weeks of gestation. Two days after IUFD, the patient experienced labor pain. The placenta and dead fetus weighing 961 g were vaginally delivered, and total bleeding was 270 mL. Although further studies to confirm the dynamic change of the uteroplacental blood flow are necessary to avoid the risk of maternal hemorrhage, vaginal TOP with placenta previa after feticide or IUFD would be feasible. PMID:27579202

  5. A Case of Vaginal Stillbirth in the Presence of Placenta Previa at 33 Weeks of Gestation

    Directory of Open Access Journals (Sweden)

    Yukiko Chinen

    2016-01-01

    Full Text Available It was demonstrated that second- and third-trimester therapeutic termination of pregnancy (TOP is feasible in cases with placenta previa. We report a 34-year-old woman with complex fetal malformations associated with placenta previa. An ultrasound examination at 21 weeks of gestation revealed fetal growth restriction (FGR and complex fetal malformations associated with a placenta previa. After extensive information, the parents opted for careful observation. Thereafter, FGR gradually progressed and we observed arrest of end-diastolic velocity of the umbilical artery. Finally, intrauterine fetal death (IUFD was confirmed at 33 weeks of gestation. Two days after IUFD, the patient experienced labor pain. The placenta and dead fetus weighing 961 g were vaginally delivered, and total bleeding was 270 mL. Although further studies to confirm the dynamic change of the uteroplacental blood flow are necessary to avoid the risk of maternal hemorrhage, vaginal TOP with placenta previa after feticide or IUFD would be feasible.

  6. Fetomaternal outcome in placenta previa - a retrospective study in teaching hospital

    Directory of Open Access Journals (Sweden)

    Manohar Rangaswamy

    2016-09-01

    Conclusions: Managing a case of placenta previa during pregnancy poses a great challenge to every obstetrician in present day obstetrics due its increased risk of maternal and perinatal complications. [Int J Reprod Contracept Obstet Gynecol 2016; 5(9.000: 3081-3084

  7. Placenta previa and pre-eclampsia: analyses of 1645 cases at Medani Maternity Hospital, Sudan

    Directory of Open Access Journals (Sweden)

    Ishag eAdam

    2013-02-01

    Full Text Available A retrospective case- control study was conducted to investigate the risk factors for pre-eclampsia -including the protective effect of placenta previa -at Medani Maternity Hospital, Sudan. Medical files of the patients during the period 2003 to 2010 were reviewed for age, parity, education level, prenatal care, placenta previa and hemoglobin level. Women with pre-eclampsia were the cases, and women with normal pregnancy were the controls. There were 54339 singleton deliveries and 1765 women with pre-eclampsia in the hospital, giving the incidence of pre-eclampsia of 3.2%. The risk factors for pre-eclampsia were; women with age > 35 year (OR= 1.4, 95% CI: 1.1-1.8, primiparity (OR = 3.3, 95% CI: 2.7–4.0, para > 5 (OR= 3.1, 95% CI: 2.4–4.0 and anemia (OR= 3.3, 95% CI: 2.8–3.9. The risk of pre-eclampsia was inversely increased with education level and prenatal care attendance. The prevalence of placenta previa was 0(0% and 55 (3.3%, P< 0.001 in pre-eclamptic and control women, respectively. Placenta previa was a significant protective factor of pre-eclampsia (OR= 0.3, 95% CI: 0.1–0.7. Although, the socio-demographic risk factors for pre-eclampsia observed among women at Medani hospital were similar to those found in other settings; placenta previa was associated with decreased incidence of pre-eclampsia.

  8. Efficacy of Intrauterine Bakri Balloon Tamponade in Cesarean Section for Placenta Previa Patients.

    Directory of Open Access Journals (Sweden)

    Hee Young Cho

    Full Text Available The aims of this study were to analyze the predictive factors for the use of intrauterine balloon insertion and to evaluate the efficacy and factors affecting failure of uterine tamponade with a Bakri balloon during cesarean section for abnormal placentation.We reviewed the medical records of 137 patients who underwent elective cesarean section for placenta previa between July 2009 and March 2014. Cesarean section and Bakri balloon insertion were performed by a single qualified surgeon. The Bakri balloon was applied when blood loss during cesarean delivery exceeded 1,000 mL.Sixty-four patients (46.7% required uterine balloon tamponade during cesarean section due to postpartum bleeding from the lower uterine segment, of whom 50 (78.1% had placenta previa totalis. The overall success rate was 75% (48/64 for placenta previa patients. Previous cesarean section history, anterior placenta, peripartum platelet count, and disseminated intravascular coagulopathy all significantly differed according to balloon success or failure (all p<0.05. The drainage amount over 1 hour was 500 mL (20-1200 mL in the balloon failure group and 60 mL (5-500 mL in the balloon success group (p<0.01.Intrauterine tamponade with a Bakri balloon is an adequate adjunct management for postpartum hemorrhage following cesarean section for placenta previa to preserve the uterus. This method is simple to apply, non-invasive, and inexpensive. However, possible factors related to failure of Bakri balloon tamponade for placenta previa patients such as prior cesarean section history, anterior placentation, thrombocytopenia, presence of DIC at the time of catheter insertion, and catheter drainage volume more than 500 mL within 1 hour of catheter placement should be recognized, and the next-line management should be prepared in advance.

  9. Evaluation of “J”-shaped Uterine Incision during Caesarean Section in Patients with Placenta Previa:A Retrospective Study

    Institute of Scientific and Technical Information of China (English)

    邹丽; 钟少平; 赵茵; 朱剑文; 陈莉娟

    2010-01-01

    This study evaluated the efficacy and safety of "J"-shaped uterine incision for caesarean section for patients diagnosed with placenta previa.A total of 55 consecutive cases of placenta previa treated in Union Hospital were retrospectively analyzed over a period of two years and 10 months.The subjects were divided into two groups with respect to the uterine incision.Twenty-four pregnant women with placenta previa who were indicated for caesarean section underwent the procedure using a new "J"-shaped uterine...

  10. Serial Change in Cervical Length for the Prediction of Emergency Cesarean Section in Placenta Previa.

    Directory of Open Access Journals (Sweden)

    Jae Eun Shin

    Full Text Available To evaluate whether serial change in cervical length (CL over time can be a predictor for emergency cesarean section (CS in patients with placenta previa.This was a retrospective cohort study of patients with placenta previa between January 2010 and November 2014. All women were offered serial measurement of CL by transvaginal ultrasound at 19 to 23 weeks (CL1, 24 to 28 weeks (CL2, 29 to 31 weeks (CL3, and 32 to 34 weeks (CL4. We compared clinical characteristics, serial change in CL, and outcomes between the emergency CS group (case group and elective CS group (control group. The predictive value of change in CL for emergency CS was evaluated.A total of 93 women were evaluated; 31 had emergency CS due to massive vaginal bleeding. CL tended to decrease with advancing gestational age in each group. Until 29-31 weeks, CL showed no significant differences between the two groups, but after that, CL in the emergency CS group decreased abruptly, even though CL in the elective CS group continued to gradually decrease. On multivariate analysis to determine risk factors, only admissions for bleeding (odds ratio, 34.710; 95% CI, 5.239-229.973 and change in CL (odds ratio, 3.522; 95% CI, 1.210-10.253 were significantly associated with emergency CS. Analysis of the receiver operating characteristic curve showed that change in CL could be the predictor of emergency CS (area under the curve 0.734, p < 0.001, with optimal cutoff for predicting emergency cesarean delivery of 6.0 mm.Previous admission for vaginal bleeding and change in CL are independent predictors of emergency CS in placenta previa. Women with change in CL more than 6 mm between the second and third trimester are at high risk of emergency CS in placenta previa. Single measurements of short CL at the second or third trimester do not seem to predict emergency CS.

  11. Sonoembryological evaluations of the development of placenta previa and velamentous cord insertion.

    Science.gov (United States)

    Hasegawa, Junichi

    2015-01-01

    Longitudinal and cross-sectional investigations using ultrasound examinations during pregnancy can be used to clarify the mechanisms and pathophysiology of abnormal fetal and placental development. Such sonoembryological assessments are useful as a method for clarifying the etiology of disease. In the present review, we describe current knowledge based on our experience with applying sonoembryological methods to determine the developmental mechanisms of placenta previa and velamentous cord insertion.

  12. Asymptomatic "placental prolapse" with cervical funneling in a patient with complete placenta previa.

    Science.gov (United States)

    Adekola, Henry; Lam-Rachlin, Jennifer; Bronshtein, Elena; Abramowicz, Jacques S

    2015-02-01

    We describe the transvaginal sonographic findings in a patient with complete placenta previa and increased risk of preterm birth owing to a prior history of mid-trimester pregnancy loss in whom we observed a short cervix and prolapse of the placenta and fetal membranes into the endocervical canal. We believe that this could lead to antepartum hemorrhage and mandate close observation when diagnosed. We introduced the term "placental prolapse" to describe our finding.

  13. Alteraciones neuropsicológicas en pacientes con VIH e historia previa de consumo de sustancias. Un estudio preliminar

    OpenAIRE

    Amalia García-Torres; Esperanza Vergara-Moragues; Adolfo Piñón-Blanco; Miguel Pérez-García

    2015-01-01

    El virus de la inmunodeficiencia humana (VIH) puede llegar a producir alteraciones cognitivas que interfieren de forma significativa en la vida diaria de las personas que lo padecen. Estos déficits pueden incrementarse cuando existe historia previa de consumo de sustancias psicoactivas. El objetivo de este trabajo es estudiar el perfil neuropsicológico de un grupo de pacientes con VIH e historia previa de consumo de drogas y compararlo con un grupo de pacientes ex drogodependientes seronegati...

  14. Central placenta previa with placenta percreta partially invading bladder: a case report

    Directory of Open Access Journals (Sweden)

    Hasina Banu

    2015-06-01

    Full Text Available Placenta previa, placenta accreta, increta and percreta are increasing day by day due to increased number of cesarean sections now days, but central placenta previa with placenta percreta invading bladder is a very rare obstetrical complication. A case of central placenta previa with placenta percreta partially invading bladder in woman who was G2P1L1 with 32+6 weeks of gestation and with history of previous cesarean section is presented in this manuscript. The patient was managed with intrapartum cesarean hysterectomy with bilateral ureter J stents and bladder repair following cesarean delivery of a preterm baby. Total estimated blood loss was 6000 mL. The patient was discharged on 28th December 2014 that is 29th day of admission with a healthy baby. The aim of this study is to bring awareness of such case and to discuss the risk factor, presentation, diagnosis, management and choice of anesthesia for the same. [Int J Reprod Contracept Obstet Gynecol 2015; 4(3.000: 859-862

  15. Nursing care for patients with placenta previa undergoing interventional therapy in the second trimester of pregnancy

    International Nuclear Information System (INIS)

    Objective: To discuss the nursing care for patients with placenta previa,who receive uterine arterial catheterization and embolization in the second trimester of pregnancy. Methods: By using superselective catheterization with Seldinger technique, bilateral uterine artery angiography and embolization were performed in 16 patients with placenta previa in the second trimester of pregnancy. Two to four hours after the procedure, rivanol intra-amniotic injection was employed to induce the abortion. Close perioperative observation and careful nursing were carried out. Results: The fetus with its subsidiary tissue was delivered in a mean time of 4.5 hours after the operation in 15 cases. No postpartum hemorrhage occurred. Induced abortion failed in one case with 26 weeks pregnancy because of a scar uterus and cervical dystocia. Hysterotomy was performed 6 days later, blood loss during the operation was about 100 ml. No nursing care related complications occurred in all 16 patients. Conclusion: Uterine arterial embolization is very helpful in making the induced abortion for the treatment of bleeding placenta previa in the second trimester of pregnancy. Strengthening of perioperative care can improve successful rate of interventional therapy and prevent the occurrence of complication. (authors)

  16. A Case Report and Literature Review of Midtrimester Termination of Pregnancy Complicated by Placenta Previa and Placenta Accreta.

    Science.gov (United States)

    Matsuzaki, Satoko; Matsuzaki, Shinya; Ueda, Yutaka; Tanaka, Yusuke; Kakuda, Mamoru; Kanagawa, Takeshi; Kimura, Tadashi

    2015-04-01

    Objective Concurrent placenta previa and placenta accreta increase the risk of massive obstetric hemorrhage. Despite extensive research on the management of placenta previa (including placenta accreta, increta, and percreta), the number and quality of previous studies are limited. We present a case of placenta accreta requiring an induced second-trimester abortion because of premature rupture of the membranes (PROM). Study Design Case report and review of the literature. Results A 41-year-old female presented at 20 weeks of gestation with placenta previa and PROM. Ultrasonography revealed placenta accreta with multiple placental lacunae. She then developed massive hemorrhaging just prior to a planned termination of pregnancy. We performed a hysterectomy with the intent of preserving life because of the failure of the placenta to detach and blood loss totaling 4,500 mL. Conclusion Previous studies suggest that second-trimester pregnancy terminations in cases of placenta previa which are not complicated with placenta accreta do not have a particularly high risk of hemorrhage. However, together with our case, the literature suggests that placenta previa complicated with placenta accreta presents a significant risk of hemorrhage both during delivery and intraoperatively. Further reports are needed to evaluate the most appropriate treatment options.

  17. Early preterm delivery due to placenta previa is an independent risk factor for a subsequent spontaneous preterm birth

    Directory of Open Access Journals (Sweden)

    Erez Offer

    2012-08-01

    Full Text Available Abstract Background To determine whether patients with placenta previa who delivered preterm have an increased risk for recurrent spontaneous preterm birth. Methods This retrospective population based cohort study included patients who delivered after a primary cesarean section (n = 9983. The rate of placenta previa, its recurrence, and the risk for recurrent preterm birth were determined. Results Patients who had a placenta previa at the primary CS pregnancy had an increased risk for its recurrence [crude OR of 2.65 (95% CI 1.3-5.5]. The rate of preterm birth in patients with placenta previa in the primary CS pregnancy was 55.9%; and these patients had a higher rate of recurrent preterm delivery than the rest of the study population (p Conclusions Women with placenta previa, who deliver preterm, especially before 34 weeks of gestation, are at increased risk for recurrent spontaneous preterm birth regardless to the site of placental implantation in the subsequent pregnancy. Thus, strict follow up by high risk pregnancies specialist is recommended.

  18. A Case Report and Literature Review of Midtrimester Termination of Pregnancy Complicated by Placenta Previa and Placenta Accreta

    Directory of Open Access Journals (Sweden)

    Satoko Matsuzaki

    2015-04-01

    Full Text Available Objective - Concurrent placenta previa and placenta accreta increase the risk of massive obstetric hemorrhage. Despite extensive research on the management of placenta previa (including placenta accreta, increta, and percreta, the number and quality of previous studies are limited. We present a case of placenta accreta requiring an induced second-trimester abortion because of premature rupture of the membranes (PROM. Study Design - Case report and review of the literature. Results - A 41-year-old female presented at 20 weeks of gestation with placenta previa and PROM. Ultrasonography revealed placenta accreta with multiple placental lacunae. She then developed massive hemorrhaging just prior to a planned termination of pregnancy. We performed a hysterectomy with the intent of preserving life because of the failure of the placenta to detach and blood loss totaling 4,500 mL. Conclusion - Previous studies suggest that second-trimester pregnancy terminations in cases of placenta previa which are not complicated with placenta accreta do not have a particularly high risk of hemorrhage. However, together with our case, the literature suggests that placenta previa complicated with placenta accreta presents a significant risk of hemorrhage both during delivery and intraoperatively. Further reports are needed to evaluate the most appropriate treatment options.

  19. HALLAZGOS INCIDENTALES EN RADIOGRAFÍAS PANORÁMICAS PREVIAS AL TRATAMIENTO DE ORTODONCIA

    OpenAIRE

    Leyva Altamirano, Jorge Luis

    2012-01-01

    El propósito de esta investigación fue determinar la frecuencia, características y localización de alteraciones o patologías de manera incidental en radiografías previas al tratamiento de Ortodoncia. Este estudio se basó en el análisis de las radiografías panorámicas de pacientes que acudieron a la clínica de Ortodoncia del CUEPI de la Universidad Michoacana de San Nicolás de Hidalgo, con el objetivo de encontrar alteraciones patológicas en pacientes sanos, sin alteraciones ...

  20. A Case of Type 2 Youssef's Syndrome following Caesarean Section for Placenta Previa Totalis

    Science.gov (United States)

    Obuz, Funda

    2016-01-01

    Vesicouterine fistula is a rare type of urogenital fistulas. It is most commonly observed after cesarean section (C/S) due to iatrogenic reasons. In this article, a case of a vesicouterine fistula which developed after C/S operation is presented. This was the patient's second C/S and this time placenta previa totalis was the primary pathology. Since it is a rare complication, we found it interesting, and, in this article, this clinical problem was discussed with details about diagnosis and treatment in light of the literature. PMID:27803827

  1. La audiencia previa al juicio en el modelo procesal civil español

    OpenAIRE

    Gascón Inchausti, Fernando; Palomo Vélez, Diego

    2007-01-01

    El trabajo analiza con detalle una de las piezas clave del nuevo proceso civil español, la audiencia previa al juicio. Se trata de una vista oral que ha de celebrarse en los juicios ordinarios una vez que las partes ya han presentado por escrito su demanda y su contestación, y que tiene una finalidad múltiple: conciliadora, depuradora de vicios procesales, delimitadora del objeto del proceso y del debate y preparatoria del acto del juicio en sí, a través de la proposición y admisión de las pr...

  2. Placenta previa

    Science.gov (United States)

    ... Leveno KL, Bloom SL, et al, eds. Williams Obstetrics . 23rd ed. New York, NY: McGraw-Hill; 2010: ... SG, Niebyl JR, Simpson JL, et al, eds. Obstetrics: Normal and Problem Pregnancies . 6th ed. Philadelphia, PA: ...

  3. Placenta Previa Percreta: A Case Report of Successful Management via Conservative Surgery

    Directory of Open Access Journals (Sweden)

    Silvia Canonico

    2013-01-01

    Full Text Available Placenta percreta is one of the most serious complications of placenta previa and is frequently associated with severe obstetric hemorrhage usually necessitating hysterectomy. We present a case of placenta previa percreta diagnosed by ultrasound and magnetic resonance imaging techniques, in which we accomplished conservative management of postpartum hemorrhage. The management we propose includes the following steps: preventive catheterization of the descending aorta via transhumeral access; Stark cesarean delivery; uterotonics drugs; Affronti endouterine square hemostatic sutures; intrauterine application of Bakri balloon and partial filling with 100 mL of normal saline; B Lynch suture, hysterorrhaphy, and filling a Bakri balloon with up to 500 mL of normal saline; reversible radiological embolization; and/or surgical ligation of the uterine arteries. The bleeding stopped following placement of Affronti sutures combined with external (B-Lynch suture and internal (Bakri balloon uterine compression. Our experience indicates that this conservative method can be considered an option in the management of selected cases of pregnancy at high risk for intrapartum hemorrhage.

  4. Safe spinal anesthesia in a woman with chronic renal failure and placenta previa

    Directory of Open Access Journals (Sweden)

    Beyazit Zencirci

    2010-05-01

    Full Text Available Beyazit ZencirciKahramanmaras, TurkeyBackground: Chronic renal failure is strongly associated with poor pregnancy outcome. Women dependent on hemodialysis before conception rarely achieve a successful live birth.Case presentation: A 31-year-old multiparous Turkish woman was scheduled for cesarean section under spinal anesthesia at 37 weeks and five days’ gestation because of hemorrhage due to secondary placenta previa. Spinal anesthesia with 8 mg of hyperbaric bupivacaine was successfully performed. Invasive blood pressure, central venous pressure, and heart rate were stable during the surgery. The mother returned to regular hemodialysis on the first postoperative day.Conclusion: Pregnancy is uncommon in women with chronic renal failure requiring chronic dialysis. Rates of maternal hypertension, pre-eclampsia, anemia, and infection in the pregnant chronic dialysis patient are high. However, our findings suggest that with careful, close, and effective monitoring preoperatively and intraoperatively, spinal anesthesia can be safely performed for cesarean section in patients undergoing hemodialysis.Keywords: chronic renal failure, pregnancy, spinal anesthesia, hemodialysis, placenta previa

  5. Reducing intraoperative lower segment blood loss in placenta previa with Ashok Anand stitch

    Directory of Open Access Journals (Sweden)

    Ashok R. Anand

    2013-04-01

    Full Text Available Background: To avoid the need for blood transfusions and reducing complications in cases of placenta previa during cesarean section delivery by a new simple innovative technique developed by Dr ASHOK ANAND known as Ashok Anand’s stitch. Methods: This stitch is based on the reasoning that taking the stitch bilaterally occludes the collaterals supplying the lower segment. As these are end arteries, their occlusion causes hemostasis in the lower segment. Sample size: 20 cases in each study group. Blood loss was estimated by standardized visual method (fixed container and mop. Results: By applying this technique in 20 cases, there was significant reduction in the blood loss compared to the control group, thereby reducing the need for blood transfusion (p value <0.05. Conclusions: Ashok Anand’s stitch is a simple and effective technique in controlling lower segment bleeding in cases of placenta previa during cesarean section thus avoiding the need for blood transfusions for operative blood loss and obstetric hysterectomy. The technique is easy to apply, less invasive and does not require any special instruments. It can be life-saving. [Int J Reprod Contracept Obstet Gynecol 2013; 2(2.000: 135-140

  6. PROYECTOS Y CONFLICTOS EN RELACIÓN CON LA CONSULTA PREVIA

    Directory of Open Access Journals (Sweden)

    Gloria Amparo Rodríguez

    2011-12-01

    Full Text Available Este documento analiza la relación entre los proyectos de desarrollo, los cuales son autorizados mediante licencias ambientales en nuestro país, y los conflictos en relación con el derecho fundamental a la consulta previa que tienen los pueblos indígenas y demás grupos étnicos y los cuales han terminado por ser resueltos ante los estrados judiciales. Este artículo está orientado a establecer los requisitos mínimos que debe tener la consulta previa para su implementación y garantía de los derechos de los pueblos indígenas al territorio, la autonomía, la participación y el desarrollo propio. Adicionalmente, ofrece una mirada al tema del consentimiento previo, libre e informado en el marco de la Corte Interamericana de Derechos Humanos y de la Corte Constitucional a través de una de sus providencias, para terminar sosteniendo que estas temáticas tan complejas, deben ser abordadas desde el enfoque basada en derechos humanos.

  7. Perinatal outcome and near-miss morbidity between placenta previa versus abruptio placentae

    International Nuclear Information System (INIS)

    To compare perinatal outcome and near-miss morbidities between placenta previa versus abruptio placentae in patients of antepartum haemorrhage (APH). Patients with APH diagnosed as placenta previa and abruptio placentae who delivered after 24 weeks of regnancy were selected from labour room. Outcome measures were birth weight, neonatal intensive care admission, stillbirth, perinatal mortality rates, near-miss, surgical intensive care admission, postpartum haemorrhage, hysterectomy, massive transfusion, renal failure, coagulopathy and maternal death. Stillbirth was defined as a fetus weighing greater or equal to 500 gm showing no sign of life after birth. Near-miss was defined as severe organ dysfunction which if not treated appropriately, could result in death. Descriptive statistics were calculated and chi-square was applied with significance level < 0.05. Stillbirths and perinatal mortality rates were significantly higher in abruptio placentae, 52.97% versus 18.18% and 534/1000 versus 230/1000 (p < 0.01). Near-miss cases were also significantly higher in abruptio placentae, 22.27%. Verus 11.18% (p < 0.01). Hypovolemic shock and coagulation failure were also significantly higher in abruptio placentae (p < 0.05). (author)

  8. Clinical analysis of 50 cases of placenta previa%前置胎盘50例临床分析

    Institute of Scientific and Technical Information of China (English)

    孔蓉; 李豫萍

    2015-01-01

    前置胎盘是一种临床较为常见的疾病,对产妇和胎儿产生较大的影响。本文简要介绍50例前置胎盘患者,探讨临床治疗效果。%Placenta previa is a clinical common disease,which has a greater impact on maternal and fetal.In this paper,the author briefly introduces 50 cases of placenta previa to provide a discussion.

  9. Effects of Complete and Partial Placenta Previa on Pregnancy Outcomes in Patients with Placenta Previa%完全性和部分性前置胎盘对产妇妊娠结局的影响

    Institute of Scientific and Technical Information of China (English)

    周紫琼

    2015-01-01

    目的:探讨完全性和部分性前置胎盘类型对产妇妊娠结局的影响。方法选取2011年1月至2013年1月于南方医科大学附属深圳妇幼保健院产科进行生产的200例产妇为研究对象,其中完全性(完全组)和部分性前置胎盘(部分组)孕妇各100例,待孕妇生产后,比较两组产妇妊娠结局、生产方式以及新生儿状况。结果完全组产妇胎盘粘连、产后出血的发生率高于部分组[42.0%(42/100)比28.0%(28/100);52.0%(52/100)比36.0%(36/100)],差异有统计学意义(P<0.05);完全组产妇剖宫产分娩方式的比例显著高于部分组(100.0%比93.0%),差异有统计学意义( P <0.05)。完全组孕妇新生儿出现早产、窒息的比例显著高于部分组,差异有统计学意义( P<0.05)。结论孕妇的前置胎盘类型对妊娠结局有重要影响,较部分性胎盘前置孕妇,完全性胎盘前置孕妇的临床症状表现更为明显,预后也更差,在实际治疗中,应加强对完全性胎盘前置孕妇的临床干预。%Objective To explore the effects of complete and partial placenta previa on pregnancy out-come in patients with placenta previa .Methods A total of 200 pregnant women with placenta previa deliv-ered in Shenzhen Maternal and Child Health Hospital Affiliated to Southern Medical University from Jan . 2011 to Jan.2013 were selected as research objects,including 100 cases of complete placenta previa,and 100 cases of partial placenta previa,after production,the pregnancy outcomes,modes of production and neonatal status of the two groups were compared.Results Incidences of placenta adhesion,postpartum hemorrhage of complete placenta previa group were higher than those of the partial placenta previa group[42.0%(42/100) vs 28.0%(28/100);52.0%(52/100) vs 36.0%(36/100)],the differences were statistically significant (P<0.05);cesarean section delivery rate of the

  10. Extraccion selectiva en mineria aurifera

    OpenAIRE

    RODRÍGUEZ SEPÚLVEDA, ANDRÉS FELIPE; MARTÍN MOLINA, JORGE

    2010-01-01

    En la mina La Independencia ubicada en Titiribí Antioquia. se vienen realizando labores de desarrollo en guías con minería selectiva para la recuperación de oro. Estas guías tienen como fin la definición de bloques de reservas, para su futura explotación. Con la elaboración de este artículo se pretende comparar los rendimientos, costos, ventajas y desventajas del avance en guías con minería selectiva y con frente completo. Durante el desarrollo de la investigación, se realizaron ensayos y...

  11. Electro-oxidative leaching of pitchblende for uranium determination by arsenazo III spectrophotometry using fluid injection analysis system; Lixiviacao eletro-oxidativa de pechblenda para determinacao de uranio por espectrofotometria com arsenazo III empregando um sistema de analises por injecao em fluxo

    Energy Technology Data Exchange (ETDEWEB)

    Sousa, Alvaro Serafim Ferreira de

    2006-07-01

    In this work two different electro dissolution cells were projected and tested in order to solubilize pitchblende minerals aiming to posterior on line association to a flow injection system for the spectrophotometric determination of uranium leachate. The influence of current density, time, temperature, the electrolyte concentration nature, and the particle suspension density, were studied. Hydrodynamic and chemical parameters effects were evaluated to establish the best efficiency of the flow injection analysis system and to receive samples pretreated by electro oxidative leaching for the uranium determination. Arsenazo III was used as a colorimetric reagent and parameters such as acidity and reagents concentration, carrier and reagent flow rates, injection volume, reactor and reduction column size were studied and optimized. The calibration curves have showed a linear behavior (R{sup 2} = 0.9996) between the concentration range of 0.05 and 2.0 mgL{sup -1}. A relative deviation standard of 5.5 % (at 0.1 mgL{sup -1}) and a detection limit of 0.02 mgL{sup -1} were obtained, as well an analytical throughput of 60 sample determinations per hour. In the association of the flow injected analysis system with the electro-dissolution cells, values up to 98 % were obtained for the uranium extraction. The developed methodology for the electrooxidative extraction and on line spectrophotometric uranium determination in pitchblende samples, showed agreement with the reference method (ICP-MS), with a deviation between the results of less than 3.5 %. The proposal system showed advantages in relation to the conventional technique, like: automation of all analytical process, less quantities and more swiftness in the sample dissolution, less volume and acid concentration and reduction of the matrix effect. (author)

  12. 4种类型前置胎盘妊娠结局分析%Pregnancy outcome analysis of four types of placenta previa

    Institute of Scientific and Technical Information of China (English)

    郑霖

    2015-01-01

    Objective:To explore the types of placenta previa and the pregnancy outcome.Methods:According to the types of placenta previa,136 cases of patients with placenta previa were divided into the central placenta previa group(n=53),the partial placenta previa group(n=16),the marginal placenta previa group(n=36) and the low placenta previa group(n=31).Results:The prenatal blood loss,postnatal blood loss,incidence of placenta implantation,incidence of hysterectomy,incidence of preterm infants, neonatal asphyxia rate,pediatric transferation rate of the central placenta previa were higher than the rest three types of placenta previa.The cesarean delivery rate of the partial placenta previa was highest followed by the central placenta previa.Conclusion:The pregnancy outcome of placenta previa was closely related to the types,and the low placenta previa and marginal placenta previa could had trial vaginal production,the partial placenta previa and central placenta previa need cesarean delivery.The harm of the partial placenta previa and central placenta previa to the maternal and infant were most serious.%目的:探讨前置胎盘的类型、妊娠结局。方法:收治前置胎盘患者136例。按照前置胎盘的类型,将其分为中央性前置胎盘组(n=53)、部分性前置胎盘组(n=16)、边缘性前置胎盘组(n=36)和低置胎盘(n=31)。结果:中央性前置胎盘产前出血量、产后出血量、胎盘植入发生率、子宫切除发生率、早产儿发生率、新生儿窒息率、转儿科率均高于其余3种类型前置胎盘。部分性前置胎盘剖宫产率最高,中央性前置胎盘次之。结论:前置胎盘的妊娠结局与类型密切相关,低置、边缘性前置胎盘可经阴道试产,部分性及中央性前置需行剖宫产。前置胎盘对母婴的危害以中央性、部分性前置胎盘最严重。

  13. 凶险性前置胎盘23例临床分析%Clinical analysis of 23 cases of pernicious placenta previa

    Institute of Scientific and Technical Information of China (English)

    赵晶; 王晓静

    2016-01-01

    Objective To explore the clinical characteristics of pernicious placenta previa,Improve the knowledge and prevention of pernicious placenta previa in clinical. Methods From June 2013 to December 2014 in our hospital 94 patients with placenta previa,analyze pernicious placenta previa group and non- pernicious placenta previa group differences before and after deliver. Results Pernicious placenta previa group bleeding time was significantly later than non- pernicious group,the difference was statistically significant (P0.05);②Pernicious placenta previa group intrapartum hemorrhage,postpartum hemorrhage,placental implantation rate,hysterectomy rate was significantly higher, the difference was statistically significant (P0.05);②观察组在产时发生大出血、产后大出血、胎盘植入、切除子宫的概率都明显高于对照组(P<0.05);③观察组新生儿1分钟Apgar评分窒息发生率明显高于对照组,差异具有统计学意义(P<0.05)。结论凶险性前置胎盘给孕产妇和新生儿带来极大的威胁,积极采取有效的防治措施对改善母儿预后具有重要意义。

  14. 凶险型前置胎盘与普通型前置胎盘对孕妇的危害性分析%Hazard analysis on pregnant women with pernicious placenta previa and common type of placenta previa

    Institute of Scientific and Technical Information of China (English)

    陶萍; 张铨富

    2015-01-01

    目的:探索研究凶险型前置胎盘以及普通型前置胎盘对孕产妇的危害性,寻求针对性的治疗和护理方法。方法选择我院收治的凶险型前置胎盘以及普通型前置胎盘孕产妇共计100例作为研究对象并按照疾病类型进行分组研究,凶险型患者属于研究组,普通型患者属于对照组,每组各50例。将两组患者手术情况以及胎儿情况等进行对比分析。结果研究组进行手术治疗时间以及术中出血量均显著多于对照组(P<0.05);研究组产后出血比例为90.00%,显著高于对照组的36.00%(P<0.05)。研究组胎盘植入比例、子宫切除比例以及输血比例均显著高于对照组(P<0.05)。研究组早产儿发生率、重度窒息率、气管插管率以及并发症发生率和死亡率均高于对照组,但差异不具有统计学意义( P>0.05)。结论前置胎盘具有较大的危害性,尤其是凶险型前置胎盘危险性更大,应当引起高度重视,选择正确的手术方式,有效减少术中和产后出血,可以有效降低子宫切除的风险。%Objective To explore the harmfulness of placenta previa and normal placenta previa on pregnant women , to seek treatment and nursing methods of .Methods The placenta previa in our hospital and the general type of maternal placenta previa as research object and grouping study , patients with placenta previa as the study group , patients with normal placenta previa as control group .The two groups of patients with operation and fetal condition were analyzed .Results The study group operation time was significantly longer than the control group, the amount of bleeding was significantly more than that of the control group (P0.05).Conclusions Placenta previa has great harmfulness , especially the pernicious placenta previa is more dangerous , should attach great importance to , the choice of correct operation , effectively reduce the

  15. MRI diagnosis of pernicious placenta previa%凶险性前置胎盘的 MRI 诊断

    Institute of Scientific and Technical Information of China (English)

    张艳; 袁军; 黄明刚

    2014-01-01

    Objective To explore the MRI diagnostic value for pernicious placental abnormalities.Methods MRI findings of 1 5 patients with pernicious placenta previa were retrospectively analyzed after cesarean section.Results Among all cases,total placenta previa was,1 1 cases and partial placenta previa was 4 cases.The placenta located in the anterior wall in 8 cases,posterior wall in 4 cases,lateral wall in 3 cases.4 cases were diagnosed as normal placenta,6 cases as adhesion,4 cases as implanted,and 1 case as penetrating.These cases had certain special MR features.Conclusion MRI is helpful in diagnosing the location and type of the perni-cious placenta,and showing whether complicated with previa implantation and penetrating.%目的:探讨 MRI 对凶险性前置胎盘伴种植异常的诊断价值。方法15例临床诊断凶险性前置胎盘的患者行 MRI 平扫,于剖宫产术后进行回顾性分析。结果完全性前置胎盘11例,不全性前置胎盘4例,胎盘位于前壁8例,后壁4例,侧壁3例,胎盘子宫分界正常4例,粘连6例,植入4例,穿通1例,各具有一定影像学特征。结论 MR 对凶险性前置胎盘位置、种类及伴有胎盘植入、穿通具有一定的诊断价值。

  16. Management of Neuraxial Anaesthesia for Emergent Caesarean Section for Placenta Previa.

    Science.gov (United States)

    Günaydın, Berrin; Kurdoğlu, Mertihan; Güler, İsmail; Bashiri, Mehrnoosh; Büyüktaşkın, Fırat; Keleşoğlu, Mine Dağgez; İnan, Gözde

    2016-02-01

    Abnormal placental attachments, such as placenta accreta, increta or percrata, can result in increased morbidity and mortality because of the risk of severe postpartum haemorrhage. We aimed to present the management of spinal anaesthesia and surgical approach for emergent caesarean section because of vaginal bleeding in a multiparous pregnant woman with placenta previa at 36 weeks' gestation. Hyperbaric bupivacaine 12 mg, fentanyl 10 μg and morphine 150 μg were intrathecally administered for spinal anaesthesia. Oxytocin, methyl ergonovin and tranexamic acid were administered after umbilical cord clamping. Breech delivery of the baby was provided by a vertical incision to the uterus for avoiding placental harm. Subtotal hysterectomy was performed leaving the placenta in situ. Two units of red blood cells were transfused during the operation, lasting approximately 40 min. The patient was uneventfully discharged on the postoperative fourth day. In conclusion, a single-shot spinal anaesthesia was successfully maintained without conversion to general anaesthesia until the end of the hysterectomy in the patient in whom placenta increta was observed during caesarean delivery.

  17. Research progress of placenta previa risk factors%前置胎盘高危因素的研究进展

    Institute of Scientific and Technical Information of China (English)

    严瑾; 孔祥; 唐丽娟; 郑英

    2016-01-01

    In recent years ,the incidence of placenta previa has been rising in China .Placenta previa can lead to maternal anemia ,postpartum hemorrhage ,hemorrhagic shock ,premature labor and neonatal asphyxia and other complications ,and it is a major cause of maternal and neonatal death in the maternity .It is important to identify the risk factors leading to placenta previa for reducing the incidence of placenta previa .This article reviews the research progress of placenta previa risk factors , in order to provide reference for reducing the incidence of placenta previa .%我国近年前置胎盘发病率呈明显上升趋势。前置胎盘可引起贫血、产后出血、失血性休克、早产及新生儿窒息等多种并发症,是导致产妇及新生儿死亡的重要原因。了解前置胎盘的高危因素,有助于预防和降低前置胎盘发生风险。笔者拟就目前对前置胎盘高危因素的研究进展进行综述,旨在为降低前置胎盘发病率提供参考依据。

  18. The Clinical Analysis of Dangerous Placenta Previa and Ordinary Placenta Previa%凶险性前置胎盘与普通型前置胎盘的临床病例分析

    Institute of Scientific and Technical Information of China (English)

    张海玲; 王冰; 张庆

    2015-01-01

    Objective:To analyze the clinical feature and treatment of dangerous placenta previa. Methods:The clinical data of 9 640 people who delivered in our hospital in July 2012—June 2014 were reviewed retrospectively, including 1 284 cases with once or more history of cesarean section, accounted for 1.3% (128/9 640) of the delivery of pregnant women at the same period. 128 cases of placenta previa, accounted for 2.6% (34/1 284) of the scar uterus pregnant women at the same period. Including 94 cases (73.4%) of ordinary placenta previa and 34 cases (26.6%) of dangerous placenta previa. Results:The incidence of dangerous placenta previa complicated by placenta accreta was significantly higher than that of common placenta previa group (χ2=11.04, P=0.00). The duration of operation, amount of bleeding in or after operation and the amount of blood transfusion were higher than the common placenta previa group (P0.05), but the amended Hb value in dangerous placenta previa group was lower than the ordinary placenta previa group after operation (P<0.05). Conclusions:The rate of dangerous placenta previa complicated by placenta accreta was high, the operation was difficult, liable to accur severe intrapartum and postpartum hemorrhage, so it was dangerous to mother and perinatal fetus. Elective surgery with full preparation and by experienced obstetrician is the key to successful treatment. Strictly for the first time cesarean section pointer, in order to reduce the incidence of dangerous placenta previa.%目的:探讨凶险性前置胎盘的临床特点及处理方法。方法:回顾性分析2012年7月—2014年6月郑州大学第二附属医院(我院)分娩的9640例孕妇,其中瘢痕子宫孕妇1284例,前置胎盘128例,包括普通型前置胎盘94例(占73.4%),凶险性前置胎盘34例(占26.6%),前置胎盘占同期分娩孕妇的1.3%(128/9640),凶险性前置胎盘孕妇占同期瘢痕子宫孕妇的2.6%(34/1284),分析

  19. Risk of placenta previa in second birth after first birth cesarean section: a population-based study and meta-analysis

    Directory of Open Access Journals (Sweden)

    Gurol-Urganci Ipek

    2011-11-01

    Full Text Available Abstract Background Objective: To compare the risk of placenta previa at second birth among women who had a cesarean section (CS at first birth with women who delivered vaginally. Methods Retrospective cohort study of 399,674 women who gave birth to a singleton first and second baby between April 2000 and February 2009 in England. Multiple logistic regression was used to adjust the estimates for maternal age, ethnicity, deprivation, placenta previa at first birth, inter-birth interval and pregnancy complications. In addition, we conducted a meta-analysis of the reported results in peer-reviewed articles since 1980. Results The rate of placenta previa at second birth for women with vaginal first births was 4.4 per 1000 births, compared to 8.7 per 1000 births for women with CS at first birth. After adjustment, CS at first birth remained associated with an increased risk of placenta previa (odds ratio = 1.60; 95% CI 1.44 to 1.76. In the meta-analysis of 37 previously published studies from 21 countries, the overall pooled random effects odds ratio was 2.20 (95% CI 1.96-2.46. Our results from the current study is consistent with those of the meta-analysis as the pooled odds ratio for the six population-based cohort studies that analyzed second births only was 1.51 (95% CI 1.39-1.65. Conclusions There is an increased risk of placenta previa in the subsequent pregnancy after CS delivery at first birth, but the risk is lower than previously estimated. Given the placenta previa rate in England and the adjusted effect of previous CS, 359 deliveries by CS at first birth would result in one additional case of placenta previa in the next pregnancy.

  20. 38例前置胎盘的超声诊断体会%The Experience of Ultrasound Diagnosis on 38 Cases of Placenta Previa

    Institute of Scientific and Technical Information of China (English)

    姜玉学

    2014-01-01

    Objective The value of ultrasound on diagnosis for placenta previa is to be discussed. Methods Analyze the data of ultrasound diagnosis selected from 38 patients of placenta previa. Results Al of 38 patients who were diagnosed by ultrasound examination as placenta previa were choose to terminate pregnancy by cesarean section when the pregnancy was termed. 11 Patients were of complete placenta previa and the other 27 patients were of partial placenta previa, all of them had vaginal bleeding in different degree. Conclusion When applying B ultrasound to diagnose placenta previa, the weeks of gestation should be noted, the placenta would occupy half space of uterine when the gestation period has passed half. The diagnostic accuracy of ultrasound examination on placenta previa reaches 90%to 95%. The diagnosis can be examined through abdomen, vagina or rectum.%目的:探讨前置胎盘的超声影像诊断价值。方法选取38例前置胎盘患者超声诊断资料进行分析。结果超声诊断为前置胎盘的38例患者足月后均以剖宫产终止妊娠。完全性前置胎盘患者11例,部分性前置胎盘患者27例,均有不同程度阴道出血。结论 B型超声诊断前置胎盘时须注意妊娠周数,妊娠中期胎盘占据宫腔一半的面积。对前置胎盘诊断准确率达90%~95%,经腹、阴道及直肠均可。

  1. Ideas previas y aprendizaje significativo en la enseñanza de la Geografía

    OpenAIRE

    Sebastiá Alcaraz, Rafael

    2014-01-01

    La primera cuestión que cabe preguntarse ante el título propuesto es si todavía es necesario investigar en las ideas previas, más si se tiene en cuenta el elevado número de trabajos realizados y publicados sobre este tema. Obviamente, la respuesta es que sí, pues se considera que la búsqueda de solución a muchos de los actuales retos de la enseñanza de la Geografía pasa, entre otras muchas consideraciones como indica Pozo (2006), por cambiar las representaciones que profesores y alumnos tiene...

  2. Prevention and Nursing of Patients with Placenta Previa%前置胎盘的护理及预防

    Institute of Scientific and Technical Information of China (English)

    田云湘

    2015-01-01

    目的前置胎盘大出血可导致孕妇失血性休克、死亡以及治疗性早产。延长分娩孕周,有助于改善围产儿预后。方法选取2011年7月~2014年6月我中心就诊前置胎盘伴出血的患者的临床资料进行回顾性分析,探讨前置胎盘伴出血患者的护理与观察,遵医嘱给予抑制宫缩、促胎肺成熟、预防感染、支持治疗等个体化期待、护理。结果29例中,1例急诊剖宫产母婴平安,28例行期待治疗,生理产1例,27例均于胎龄接近(或达到)足月终止妊娠剖宫产。结论前置胎盘是妊娠晚期的严重并发症,危及母婴生命安全,开展积极的护理措施可延长孕周,可以明显降低孕产妇和围产儿死亡率。%Objective Placenta previa bleeding can cause pregnant women to hemor hagic shock and death as wel as the treatment of preterm labor,prolong gestational weeks,Help to improve the perinatal prognosis. Methods Clinical data of 2011 July to 2014 June were selected in our Center Hospital of placenta previa complicated with hemorrhage were analyzed retrospectively,to investigate the placenta previa with hemorrhage observation and nursing of patients (The doctor's advice given to inhibit uterine contraction,to promote fetal lung maturity,prevention of infection,treatment,nursing care of individual expectation). Results In 29 cases,1 cases of emergency cesarean sectionmother and child safe,28 underwent expectant treatment,physiological property in 1 cases,27 cases were in gestational age close to (or reach)term termination of pregnancy in cesarean section.Conclusion Placenta previa is a severe complication in late pregnancy,endanger mother and baby's safety,car y out active nursing measures can prolong gestational weeks, can significantly reduce maternal and perinatal mortality.

  3. Calidad de atención y satisfacción del usuario con cita previa en medicina familiar de Guadalajara

    OpenAIRE

    Cecilia Colunga Rodríguez; Marco Antonio López Montoya; Guadalupe Aguayo Alcaraz; José Luis Canales Muñoz

    2007-01-01

    Objetivo: evaluar la calidad de la atención y satisfacción del usuario con cita previa en unidades de medicina familiar. Métodos: se aplicó un diseño transversal analítico a una muestra probabilística de 983 usuarios, se usaron dos cuestionarios validados para explorar calidad del servicio y satisfacción del usuario, se registraron variables sociodemográficas y cita previa. Se aplicaron las pruebas estadísticas F de Fisher, y chi cuadrado. Resultados: la muestra se caracterizó por tener 67 % ...

  4. Evaluación de la política pública de consulta previa del Ministerio de Ambiente durante 2009 y 2010

    OpenAIRE

    Herrera Santoyo, Héctor Andrés

    2013-01-01

    El Estado colombiano reconoció el derecho a la consulta previa de los grupos étnicos. En consecuencia, asignó funciones al Ministerio de Ambiente para garantizar este derecho cuando va imbricado al trámite de licencias ambientales de proyectos que tienen impactos positivos o negativos en el territorio de un grupo étnico. Para esta situación, el presente trabajo de grado hace una evaluación de la política pública de consulta previa del Ministerio de Ambiente durante el periodo 2009-2010, bajo ...

  5. 凶险型前置胎盘妊娠38例临床分析%Clinical analysis of 38 pregnant cases with pernicious placenta previa

    Institute of Scientific and Technical Information of China (English)

    王马列; 梁润彩

    2014-01-01

    目的:探讨凶险型前置胎盘的诊治及妊娠结局,提高对凶险型前置胎盘的认识水平,为临床上对凶险型前置胎盘母儿预后咨询提供依据。方法收集并分析38例凶险型前置胎盘及45例普通前置胎盘孕妇的临床资料,包括母体一般情况、产前超声检查、MRI 检查、胎盘病理及母儿围生结局。结果凶险型前置胎盘组胎盘植入、子宫切除、产后出血、输血、产妇转 ICU 的发生率及出血量均较普通前置胎盘组明显升高(P 均<0.05),新生儿胎龄小于36周比例、转新生儿 ICU 率及新生儿呼吸窘迫综合征发生率稍高于普通前置胎盘组,但比较差异无统计学意义(P 均>0.05)。凶险型前置胎盘中非胎盘植入组与普通前置胎盘组母儿发病率比较差异无统计学意义(P >0.05)。结论凶险型前置胎盘易并发胎盘植入,子宫切除率高,孕产妇不良结局风险较普通前置胎盘增加,但围生儿不良结局风险无明显增加。%Objective To investigate the diagnosis,treatment and pregnancy outcome of pernicious placenta previa and deepen the understanding of pernicious placenta previa,offering clinical evidence for such cases.Methods Clinical data of 38 cases with pernicious placenta previa and 45 cases with placenta previa were retrospectively analyzed,including general maternal state,ultrasonic and magnetic resonance imaging ex-aminations,placental pathology and perinatal outcomes of both mother and fetus.Results The incidence of placenta accreta,hysterectomy,blood loss,postpartum hemorrhage,blood transfusion and maternal intensive care unit admissions in pernicious placenta previa group was significantly higher than those in placenta previa group (all P 0.05).The incidence of maternal and perinatal morbidity be-tween pernicious placenta previa without placenta accreta and placenta previa groups did not significantly differ (P >0.05).Conclusions The incidence

  6. SBA-15分子筛用于组装二溴对氯偶氮胂%USE OF MOLECULAR SIEVE SBA - 15 FOR INCORPORATION OF DIBROMOCHLORO-ARSENAZO

    Institute of Scientific and Technical Information of China (English)

    翟庆洲; 于辉; 蔡建岩; 秦亮

    2006-01-01

    Molecular sieve (SBA - 15)-(dibromochloro-arsenazo, DBC-ASA) host-guest composite materials were prepared by a liquid-phase grafting method using the calcined SBA- 15 molecular sieve as the host material, the DBC-ASA solution as the guest material, and water as the medium. The composite materials (SBA- 15)-(DBC-ASA) were characterized by X-ray diffraction(XRD), Fourier transform infrared(FTIR)spectra, solid state diffuse reflectance absorption spectra, and luminescence studies. The XRD results show that the molecular sieve framework in the (SBA- 15)-(DBC-ASA) host-guest composite materials is retained, and is highly ordered. The FTIR spectra indicate that the framework of the SBA- 15 molecular sieve is retained when a small amount of DBC-ASA is incorporated into it, the order degree of the molecular sieve decreases when a large amount of DBC-ASA is incorporated into it. The solid state diffuse reflectance absorption spectra show that DBC-ASA is located in the channel of the SBA - 15 molecular sieve, and the channel of SBA - 15 has stereoconfinment. The luminescence spectra show a strong non-radiation transition processes in the prepared samples, and this results in very strong electron-photon interaction causing a charge transfer transition. The Stokes displacement takes place and the spectrum bands broaden.%以煅烧的分子筛SBA-15为主体材料,二溴对氯偶氮胂(dibromochloro-arsenazo,DBC-ASA)作客体材料,以水为介质,用液相移植法制备了(SBA-15)-(DBC-ASA)主客体复合材料.用粉末X射线衍射、Fourier变换红外光谱、固体扩散漫反射吸收光谱及发光研究表征了所制得的复合材料(SBA-15)-(DBC-ASA)的性质.X射线衍射结果表明:(SBA-15)-(DBC-ASA)主客体复合材料分子筛骨架存在且有序度高.红外光谱分析表明:较低量的DBC-ASA引入SBA-15分子筛中,分子筛骨架结构仍然存在,但引入量较大时,分子筛的骨架有序度明显降低.固体扩散漫反射吸收光谱研

  7. Placenta Prévia: Fatores de risco para o Acretismo Placenta Previa: Risk Factors for Accretion

    Directory of Open Access Journals (Sweden)

    Maria Regina Torloni

    2001-08-01

    Full Text Available Objetivo: investigação dos fatores de risco associados ao acretismo em pacientes com placenta prévia (PP. Métodos: foi realizada uma análise retrospectiva caso-controle de todos os prontuários de pacientes com diagnóstico de PP que tiveram seus partos na Maternidade Escola Vila Nova Cachoeirinha (São Paulo entre 1986 e 1998. O grupo com acretismo foi comparado ao grupo sem acretismo quanto à idade, paridade, antecedentes de abortamentos, curetagens e cesarianas, o tipo de PP e a área predominante de inserção placentária. Para avaliar a associação entre a variável dependente (acretismo placentário e as variáveis independentes (características maternas e placentária foram utilizados o teste do chi², análise univariada e multivariada, considerando-se significantes os valores de p Purpose: to investigate risk factors associated with accretion in placenta previa (PP patients. Methods: this was a retrospective case-control study of all the records of patients who delivered between 1986-1998 at Maternidade Escola de Vila Nova Cachoeirinha (São Paulo with a diagnosis of placenta previa. The groups with and without accretion were compared regarding age, parity, previous history of miscarriage, curettage and cesarean section, type of PP and predominant area of placental attachment. Possible associations between the dependent (accretion and independent (maternal and placental characteristics variables were evaluated using the chi² test, univariate and multivariate analyses. Results: reviewing 245 cases of PP, two risk factors were significantly associated with accretion: central placenta previa (odds ratio (OR: 2.93 and two or more previous cesarean sections(OR: 2.54. Based on these data, a predictive model was constructed, according to which a patient with central PP and two more previous cesarean sections has a 44.4% risk for accretion. Conclusions: results of the current study may help obstetricians in the classification of their

  8. Anesthetic management of a parturient with placenta previa totalis undergoing preventive uterine artery embolization before placental expulsion during cesarean delivery: a case report.

    Science.gov (United States)

    Lee, Jae Woo; Song, In Ae; Ryu, Junghee; Park, Hee-Pyoung; Jeon, Young-Tae; Hwang, Jung-Won

    2014-10-01

    Placenta previa totalis can cause life-threatening massive postpartum hemorrhage, and careful anesthetic management is essential. Preventive uterine artery embolization (UAE) before placental expulsion was introduced to reduce postpartum bleeding in cases of placenta previa totalis. We describe the case of a 40-year-old woman (gravida 0, para 0) with placenta previa totalis and uterine myomas who underwent intraoperative UAE, which was preoperatively planned at the strong recommendation of the anesthesiologist, immediately after delivery of a fetus and before removal of the placenta during cesarean delivery under spinal-epidural anesthesia. After confirming embolization of both uterine arteries, removal of the placenta resulted in moderate bleeding. The estimated blood loss was 2.5 L, and 5 units of red blood cells were transfused. The parturient was discharged uneventfully on postoperative day 4. This case shows that the bleeding risk is reduced by intraoperative UAE in a patient with placenta previa totalis, and anesthesiologists have an important role in a multidisciplinary team approach.

  9. RANDOMISED CONTROL STUDY OF USE OF PROGESTERONE V / S PLACEBO FOR MANAGEMENT OF SYMPTOMATIC PLACENTA PREVIA BEFORE 34 WEEKS OF GESTATION IN A TERTIARY CARE CENTRE

    Directory of Open Access Journals (Sweden)

    Shibram

    2015-04-01

    Full Text Available INTRODUCTI ON: APH complicates 3 - 5% of pregnancies and is a leading cause of perinatal and maternal mortality worldwide. Progesterone is essential in maintenance of pregnancy and helps in prolongation of pregnancy. Different trials have been done to show the efficacy and safety of progesterone in prevention of preterm birth but study related to use in expectant management of symptomatic placenta previa is very limited. AIMS AND OBJECTIVE: The objective of our study is to determine the effectiveness of intramascular 17 alpha hydroxy progesterone Caproate therapies vs. placebo in conservative management of patient with symptomatic placenta previa before 34 weeks of gestation. MATERIALS AND METHOD S: It is a randomized control study with 100 pregnant women attending Obstetric deptt. a t Nilratan Sircar Medical College and Hospital, Kolkata with symptomatic placenta previa having episode of warning haemorrhage before 34 weeks of gestation and fulfilling inclusion criteria were enrolled for the study in a two year period from January 2013 to December 2014. Statistical analysis was performed using student t - test and chai - square test where appropriate. RESULTS AND ANALYSIS: In our study prolongation of pregnancy in progesterone receiving group is statistically significant (p - value<0.001, significant difference were also found in gestational age at delivery ( p value of 0.0288, birth - weight (p - value of 0.0470. CON CLUSION: In this study use of 17 alpha hydroxy progesterone in expectant management of symptomatic placenta previa tends to be beneficial than placebo.

  10. Case with pyoderma gangrenosum abruptly emerging around the wound of cesarean section for placenta previa with placenta accrete.

    Science.gov (United States)

    Nonaka, Taro; Yoshida, Kunihiko; Yamaguchi, Masayuki; Aizawa, Atsuko; Fujiwara, Hiroshi; Enomoto, Takayuki; Takakuwa, Koichi

    2016-09-01

    A 39-year-old woman underwent emergency cesarean section (CS) due to placenta previa totalis with massive bleeding. Two major problems emerged in this patient after CS was carried out. One was partial retention of the placenta due to placenta accreta. Another major and more serious problem was pyoderma gangrenosum (PG) widely appearing at the skin of the abdomen around the CS wound. Conservative treatment was performed for the retained placenta, and it had completely disappeared by 76 days after the CS. The diagnosis of PG was promptly made in consultation with a plastic surgeon and a dermatologist when a wide ulcer emerged around the CS wound, and high-dose prednisolone was administered as treatment. At 90 days following the CS, near-complete epithelialization was achieved. This extremely rare case reflects the importance of rapid diagnosis and treatment of PG.

  11. Indefinite Fetal Heart Rate Pattern in a Patient with Vasa Previa: A Situation Where Guideline Is Inapplicable.

    Directory of Open Access Journals (Sweden)

    Yan-Zhen Zhang

    2014-01-01

    Full Text Available Most fetal heart rate patterns can be interpreted accurately so that management decisions can be made correctly. How-ever, few fetal heart rate patterns are so ambiguous that the obstetricians cannot interpret them precisely. A 27-year-old woman at 38 weeks' gestation in her first pregnancy was admitted with heavy vaginal bleeding and decrease in fetal movements. Fetal status was indeterminate according to an indefinite fetal heart rate tracing with regular decelerations. After emergent cesarean delivery, a ruptured vasa previa, traversing the fetal membrane, unsupported by either the umbilical cord or placental tissue, was clearly identified. Treatment decision-making is challenging in such patient with indefinite fetal heart rate pattern because limited data exist to guide management. Well-designed studies are needed to clarify the uncertainty about the effect of indefinite fetal heart rate pattern on clinical outcomes.

  12. 瘢痕子宫合并前置胎盘临床分析%Clinical analysis of scar uterus combined with placenta previa on maternal pregnancy outcome

    Institute of Scientific and Technical Information of China (English)

    程春花; 李根霞; 崔世红; 许雅娟

    2013-01-01

    目的 探讨瘢痕子宫合并前置胎盘对母婴妊娠结局的影响.方法 回顾性分析郑州大学第三附属医院2011年11月至2012年11月住院分娩148例前置胎盘患者的临床资料,其中瘢痕子宫合并前置胎盘者74例为观察组,单纯前置胎盘组74例为对照组.比较两组间产后出血量、子宫切除率、胎盘植入及早产等发生率.结果 瘢痕子宫合并前置胎盘组与对照组相比,产后出血发生率高、产后出血量多(P<0.01).瘢痕子宫合并前置胎盘组子宫切除率、胎盘植入率明显升高(P<0.01),新生儿的早产率也明显升高(P<0.05).结论 瘢痕子宫合并前置胎盘对母儿影响大,术前应提高警惕,做好充分术前准备,必要时及时切除子宫.%Objective To explore the influence of scar uterus combined with placenta previa on maternal pregnancy outcom.Methods Retrospective analysis of our hospital from 2011 November to 2012 November hospitalized childbirth the clinical data of 148 patients with placenta previa,the merger of scar uterus placenta previa 74 cases as the observation group,pure placenta previa group 74 cases as control group.Comparison of postpartum blood loss between the two groups,uterus resection rate,and the incidence of preterm birth placenta increta.Results Merger of scar uterus placenta previa group compared with control group,the high incidence of postpartum hemorrhage,postpartum blood loss (P < 0.01).Scar uterus uterus resection rate,rate of placenta implantation combined placenta previa group increased significantly (P < 0.01),neonatal preterm birth rates also increased significantly (P < 0.05).Conclusion Scar uterus combined with placenta previa big influence on mothers and infants preoperative should be vigilant,makes adequate preoperative preparation,timely removal of the uterus when necessary.

  13. Prenatal MRI diagnosis of placenta previa complicated with placenta accreta%前置胎盘合并胎盘植入的MRI产前诊断

    Institute of Scientific and Technical Information of China (English)

    钟华; 李丽红; 代海洋; 黎昕; 刘锦文

    2014-01-01

    目的:探讨前置胎盘合并胎盘植入的产前MRI诊断价值。材料与方法回顾性分析经手术病理证实的48例前置胎盘患者的临床及MRI资料,包括前置胎盘合并胎盘植入者12例,总结分析其MRI影像学特征。结果 MRI术前诊断前置胎盘43例,其中完全性前置胎盘31例,部分型前置胎盘9例,边缘型前置胎盘3例,总体诊断符合率为89.5%(43/48)。MRI术前正确诊断胎盘植入9例,诊断符合率为75.0%(9/12)。结论 MRI对前置胎盘及胎盘植入有较高的诊断价值,综合MR不同成像序列可提高术前诊断准确率。%Objective: To investigate the prenatal MRI imaging features of placenta previa complicated with placenta accreta.Materials and Methods:The clinical and MRI data of 48 cases of placenta previa including 12 placenta accreta conifrmed by clinic and surgery were retrospectively analyzed.Results: Forty-three cases of placenta previa were diagnosed by MRI pre-operation, including 31 cases of complete placenta previa, 9 cases of partial placenta previa and 3 cases of marginal placenta previa. The overall diagnose accordance rate was 89.5% (43/48). Nine cases of placenta accreta were diagnosed by MRI pre-operation, the diagnose accordance rate was 75.0% (9/12).Conclusions:MRI has a high accuracy for the diagnosis of placenta previa, the combination of different MR sequence can make accurate diagnosis possible.

  14. Experience in the Treatment of Pernicious Placenta Previa%凶险性前置胎盘的治疗体会

    Institute of Scientific and Technical Information of China (English)

    石淑颖

    2016-01-01

    Objective To explore treatment methods and the clinical effect of the pernicious placenta previa patients, to improve and perfect measures of placenta previa.Methods 10 cases of placenta previa patients were selected from our hospital, the pernicious placenta previa patients were treated from Prepare the preoperative, intraoperative and postoperative care.Results There were 8 cases of patients with placenta implantation in 10 cases of placenta previa patients, 6 cases occurred postoperative bleeding, 2 cases treated with topical hemostatic suture hemostasis, retained the uterus, the other 4 cases were Bleeding shock, treated with performing a hysterectomy and aftercare back to normal.Conclusion The risk of dangerous placenta previa is great, should strength the medical staff awareness, rational preoperative assessment, timely effective hemostasis and postoperative effective nursing may give a timely and effective treatment for patients with pernicious placenta previa.%目的探讨凶险性前置胎盘的治疗方法及临床效果,提高并完善凶险性前置胎盘的应对措施。方法对我院接收的10例凶险性前置胎盘患者进行分析,从术前准备、术中处理和术后护理三方面对凶险性前置胎盘患者进行干预。结果10例凶险性前置胎盘患者中8例伴有胎盘植入,其中6例患者在术后发生大出血,2例通过局部缝扎止血成功止血,保留住子宫,其他4例出现大失血休克,通过子宫切除手术和后期护理恢复正常。结论凶险性前置胎盘危险性极大,要加强医务人员的重视程度,术前的整体合理评估、术中及时有效止血和术后有效护理可以对凶险性前置胎盘患者予以及时、有效救治。

  15. Alteraciones neuropsicológicas en pacientes con VIH e historia previa de consumo de sustancias. Un estudio preliminar

    Directory of Open Access Journals (Sweden)

    Amalia García-Torres

    2015-01-01

    Full Text Available El virus de la inmunodeficiencia humana (VIH puede llegar a producir alteraciones cognitivas que interfieren de forma significativa en la vida diaria de las personas que lo padecen. Estos déficits pueden incrementarse cuando existe historia previa de consumo de sustancias psicoactivas. El objetivo de este trabajo es estudiar el perfil neuropsicológico de un grupo de pacientes con VIH e historia previa de consumo de drogas y compararlo con un grupo de pacientes ex drogodependientes seronegativos. Se administró una batería neuropsicológica a una muestra de 28 sujetos espa˜noles, 14 con VIH y 14 seronegativos, donde se evaluaron los 8 dominios cognitivos que suelen estar más afectados en el VIH: atención/memoria de trabajo, velocidad de procesamiento de la información, memoria/aprendizaje, abstracción/función ejecutiva, lenguaje/verbal y habilidades motoras. Los resultados mostraron peor ejecución del grupo con VIH en todos los dominios cognitivos. El menor rendimiento neuropsicológico del grupo con VIH podría deberse presumiblemente a la acción del virus. Independientemente de cuál sea la etiología del deterioro cognitivo, lo importante es detectar los déficits neuropsicológicos de la forma más precoz posible para mejorar la calidad de vida de los pacientes mediante la intervención neuropsicológica.

  16. Caracteristicas de las personas que acuden a las consultas de demanda del centro de salud sin citación previa

    Directory of Open Access Journals (Sweden)

    Carlos Isanta Pomar

    2000-01-01

    Full Text Available FUNDAMENTO: El tiempo de espera para acceder a la consulta está considerado un indicador de satisfacción. Las visitas no urgentes, realizadas sin cita previa, provocan un incremento del tiempo de espera de los pacientes citados, con la consiguiente insatisfacción de los mismos. El objetivo del estudio persigue la valoración cuantitativa de este tipo de visitas y conocer las características de las mismas, para introducir las medidas destinadas a su corrección y racionalización. MÉTODOS: Estudio descriptivo. Se realizó un registro que recogiera las características de los pacientes que originan las consultas sin cita previa, como la edad y el sexo y las relativas a la consulta: motivo, modalidad, jornada laboral y si era realizada de forma directa o indirecta. RESULTADOS: El 14,19% de consultas a demanda no urgentes son sin citación previa. Con el análisis factorial de correspondencias múltiple se identifican dos perfiles de consultas: las directas, solicitadas por pacientes jóvenes, por enfermedad o tareas burocráticas, al final de la consulta de la mañana, estando ellos presentes, y las consultas indirectas, ocasionadas durante las consultas con cita previa por pacientes que solicitan recetas. CONCLUSIONES: Hay un elevado número de visitas sin cita previa. Son precisas medidas que puedan conducir a la utilización del sistema de organización de las consultas y a la mejora de aquellas situaciones que impliquen una falta de accesibilidad, con la finalidad última de mejorar la satisfacción de los usuarios de los servicios sanitarios públicos.

  17. 超声在前置胎盘诊断中的应用%Application of ultrasound in diagnosis of placenta previa

    Institute of Scientific and Technical Information of China (English)

    脱淑梅; 蔺茹; 李富萍

    2013-01-01

    Placenta previa is the first cause of antepartum hemorrhage and the main cause of perinatal hysterectomy. Ultrasound can be used to predict the natural history of placenta previa and antepartum hemorrhage, and to screen related diseases such as placenta implantation and vasa previa. The application of ultrasound has improved the diagnosis and treatment of placenta previa, and vaginal ultrasound has been widely accepted. However, there are still many clinical problems, such as how to predict the period that pregnancy can keep with ultrasound, and these problems need to be further explored. This article reviewed the role of ultrasound in the diagnosis of placenta previa.%前置胎盘是产前出血的第1位原因和围生期子宫切除的主要原因,超声可用于预测前置胎盘的自然转归、产前出血,并能对前置胎盘相关疾病如胎盘植入和血管前置进行筛查.利用超声已经提高了前置胎盘的诊治水平,阴道超声也已被广泛接受,但超声在前置胎盘的诊断中仍存在很多临床问题,如用超声预测妊娠所能维持的时间等,这些问题还有待于进一步探索.该文对超声在前置胎盘诊断中的作用进行了综述.

  18. 凶险性前置胎盘12例临床分析%Clinical analysis of 12 cases with overwhelming placenta previa

    Institute of Scientific and Technical Information of China (English)

    齐丽华; 高金山

    2015-01-01

    Objective:To explore the dangers of overwhelming placenta previa to maternal and its diagnosis and treatment and preventive measures.Methods:The placenta implantation,postpartum hemorrhage and hysterectomy of 86 cases of patients with placenta previa were analyzed retrospectively.Results:The incidence of placenta implantation,postpartum hemorrhage loss and hysterectomy rate of the patients with overwhelming placenta previa were higher than that of the patients with non-overwhelming placenta previa(P<0.05).Conclusion:Overwhelming placenta previa had great harm to maternal.Mastering caesarean indications, noticing antenatal examination and pregnancy care,well postpartum rescue measures were the keys process.%目的:探讨凶险性前置胎盘对产妇的危害及其诊断、处理和预防措施。方法:回顾性分析前置胎盘患者86例胎盘植入、产后出血和子宫切除情况。结果:凶险性前置胎盘患者胎盘植入的发生率、产后出血量及子宫切除率均高于非凶险性前置胎盘患者(P<0.05)。结论:凶险性前置胎盘对产妇有极大危害。掌握剖宫产指征、注意产前检查和孕期保健、作好产后抢救措施是处理关键。

  19. Diagnosis of Placenta Previa and Placenta Implantation With MRI%前置胎盘及胎盘植入的MRI诊断

    Institute of Scientific and Technical Information of China (English)

    刘静; 罗莎

    2015-01-01

    ObjectiveTo explore the application value of MRI in the prenatal diagnosis of front disc and implantation of placenta previa. Methods Retrospective analysis of our hospital 16 cases of placental MRI examination conifrmed byoperation and pathology after cesarean section. Results8 cases of central placenta previa, 5 cases of partialplacenta previa, 2 cases of marginal placenta previa, low-lying placenta 1 cases, 2 cases of Placenta Adhesion, 2 cases of placenta implantation, including 1 cases of transmural implantation, placenta in the posterior inferior wall in 11 cases, 4 cases of anterior inferior wall, 2 cases of lateral wall.Conclusion MRI on placenta previa placenta implantation in the clinical diagnosis and timely and reasonable treatment plan have some certain signiifcance.%目的:探讨MRI在诊断产前前置前盘及植入性前置胎盘的应用价值。方法剖宫产后回顾性分析我院经手术及病理证实的16例胎盘MRI检查。结果中央性前置胎盘8例,部分性前置胎盘5例,边缘性前置胎盘2例,低置胎盘1例,胎盘粘连2例,胎盘植入2例,其中1例透壁植入,胎盘位于后下壁11例,前下壁4例,侧壁2例。结论 MRI对前置胎盘及胎盘植入诊断对临床及时合理制定治疗方案有一定意义。

  20. The value of MRI in the diagnosis of placenta previa%MRI对前置胎盘的诊断价值

    Institute of Scientific and Technical Information of China (English)

    姚文君; 杨硕; 郑穗生; 王龙胜; 鲍芳

    2015-01-01

    目的:探讨MRI对前置胎盘及合并胎盘植入的诊断价值。方法回顾分析手术及病理证实的15例前置胎盘患者的临床及MRI资料,包括1例前置胎盘合并胎盘植入及1例前置胎盘合并胎盘粘连,分析并总结其MRI诊断要点。结果完全性前置胎盘共6例,MRI对于完全性前置胎盘的诊断正确率为100.0%,但其中1例完全性前置胎盘合并胎盘粘连MRI术前漏诊,诊断符合率83.3%;部分性前置胎盘共3例,正确诊断2例,诊断符合率66.7%;边缘性前置胎盘共6例,诊断符合率为100.0%。而超声检查除1例完全性前置胎盘合并胎盘粘连漏诊外,其余病例均符合。结论 MRI对前置胎盘具有较高的诊断价值,多方位多角度观察有助于前置胎盘的明确分型。%Objective To investigate the value of MRI in diagnosis of placenta previa and its combination of placenta accrete. Mate-rials and Methods Retrospective analysis the clinical data and MRI features of 15 Cases of placenta previa,whichconfirmed by operation and pathology, including 1 case of placentaaccreta,and 1 case with adherent placenta, analyze and summarize the diagnostic poinst of MRI ima-ging. Results There are 6 cases of complete placenta previa,thediagnosisofMRI was correct,1 case with adherent placenta were not diag-nosed by MRI pre-operation,accordance rate was 83. 3%;3 cases of partial placenta previa,MR diagnosed 2 cases,thediagnoseaccordance rate was 66. 7%;6 cases of marginal placenta previa,thediagnose accordance rate was 100. 0%. US was not diagnose 1 case with adherent placenta,the rest of cases were diagnosed correctly. Conclusions MRI has a high diagnostic value of placenta previa, multi direction and multi angle observation make classification clearly.

  1. Comparación del nivel de condiciones previas de rendimiento de tenistas de élite (estudio de caso

    Directory of Open Access Journals (Sweden)

    Jiří Zháněl

    2015-04-01

    Full Text Available En el mundo del tenis de hoy en día, hay una clara tendencia hacia un juego físicamente exigente, en el que las condiciones previas motrices más importantes son la velocidad (acción y reacción, la fuerza (sobre todo la inicial y la explosiva, la fuerza resistencia y las habilidades específicas de coordinación. El presente estudio se basa en la teoría retrospectiva. El objetivo de la investigación fue el análisis longitudinal del nivel de condiciones previas somáticas y motrices de tenistas checos de élite (el tenista Tomas Berdych –TB– y la tenista Petra Kvitova –PK–. Con fecha 1 de junio de 2014, Tomas Berdych es el tenista número 1 de República Checa y el número 6 del mundo en el Ranking ATP (4330 puntos, habiendo logrado su mejor ranking hasta la fecha en 2013 (número 5 del mundo; con la misma fecha la tenista Petra Kvitova también es la tenista número 1 de República Checa y la número 6 del mundo en el Ranking WTA (4600 puntos, habiendo logrado su mejor ranking hasta la fecha en 2011 (número 2 del mundo. Los dos tenistas fueron evaluados longitudinalmente mediante la batería de test TENDIAG1, la cual contiene tres ítems somáticos y seis ítems motores. Los resultados de ambos tenistas claramente mostraron que, a lo largo de todo el periodo de monitorización, su puntuación total en la batería de test se encontraba por encima de la media de la población de tenistas. La evaluación de las diferencias entre sexos mostró un nivel significativamente más alto en la mayoría de ítems en el tenista TB, excepto en los ítems de flexibilidad del torso y de velocidad de reacción de brazos y piernas. La tenista PK obtuvo un mejor nivel en el índice de movilidad del hombro. Los resultados proporcionan interesantes conocimientos y sugerencias para el entrenamiento del tenis.

  2. 凶险性前置胎盘29例临床分析%Clinical analysis of 29 dangerous placenta previa cases

    Institute of Scientific and Technical Information of China (English)

    刘晓玲

    2015-01-01

    目的:探讨凶险性前置胎盘的临床诊断及治疗经验。方法回顾性分析29例凶险性前置胎盘患者的临床资料。根据术中发现胎盘植入和非植入分为植入组15例和非植入组14例。观察两组孕妇产前出血情况、前置胎盘类型与胎盘植入关系、剖宫产术中出血量、产后出血情况及术中处理情况。结果植入组和非植入组产前出血发生率相比,差异有统计学意义(P<0.05),植入组边缘性前置胎盘3例,部分性1例,完全性11例,非植入组分别为10例、2例、2例,两组差异有统计学意义(P<0.05)。结论严格掌握好剖宫产的指征,降低剖宫产率是减少凶险性前置胎盘的根本所在,产前及时诊断,术前做好充分准备,可有效改善预后。%Objective To investigate experience of clinical diagnosis and treatment for dangerous placenta previa.Methods Clinical data of 29 dangerous placenta previa patients were retrospectively analyzed. They were divided into placenta implantation group with 15 cases and non-implantation group with 14 cases. Observation was made on antenatal hemorrhage, relationship between placenta previa type and placenta implantation, intraoperative bleeding volume in caesarean section, postpartum hemorrhage, and surgical condition of the two groups.Results The difference of antenatal hemorrhage rate between implantation group and non-implantation group had statistical significance (P<0.05). The implantation group had 3 cases of marginal placental previa, 1 case of partial placenta previa, and 1 case of total placenta previa. The non-implantation group had these placenta previa types in 10 cases, 2 cases and 2 cases. The difference between the two groups had statistical significance (P<0.05).Conclusion The basis of reducing dangerous placenta previa is strict follow of caesarean section indication and decrease of caesarean section rate. Timely antenatal diagnosis and full preoperative preparation

  3. Placenta previa symptom, pathology and diagnosis%胎盘前置状态与前置胎盘的病理和诊断问题

    Institute of Scientific and Technical Information of China (English)

    李儒芝; 李笑天

    2011-01-01

    The placenta previa is divided into low-lying placenta, marginal, partial, or complete placenta previa. Its diagnosis is based on ultrasound. The distance from the placental edge to the internal cervicai os could be accurately measured by transvaginal sonography, which is valuable in planning route of delivery.%胎盘前置状态的消失与否取决于胎盘的位置.前置胎盘或胎盘前置状态,明确诊断需要做影像学检查:超声检查和核磁共振成像.经阴道超声检查可以准确地测量胎盘边缘和宫颈内口之间的距离,这对决定前置胎盘患者的分娩方式县有价值.

  4. ¿En qué medida evolucionan las ideas previas de los alumnos y alumnas tras una intervención didáctica?

    OpenAIRE

    González Chacón, Gemma

    2015-01-01

    El trabajo que se va a presentar a continuación trata una problemática acerca de la poca atención y el mal uso que se le da a las ideas previas del alumnado de Educación Infantil. Partiendo de esta problemática se explica en qué consisten las ideas previas y cómo trabajarlas en un aula de Educación Infantil. No obstante, esta es solo una pequeña parte del trabajo, el gran grueso del mismo se encuentra en el diseño e implementación de instrumentos de recogida y análisis de id...

  5. Clinical analysis of placenta previa complicated with placenta accreta%前置胎盘合并胎盘植入的临床分析

    Institute of Scientific and Technical Information of China (English)

    卢培玲; 辛崇敏; 徐宝兰

    2011-01-01

    目的 探讨前置胎盘合并胎盘植入的高危因素、临床特点、诊断及治疗.方法 对日照市中医医院4年间8 964例产妇中12例前置胎盘合并胎盘植入的患者资料进行分析.结果 在8 964例产妇中前置胎盘发生率为0.97%(87/8 964);87例前置胎盘患者均为多孕次产妇,经产妇占58.62%(51/87),高龄产妇占65.52%(57/87).前置胎盘合并胎盘植入的发生率为0.13%(12/8 964),占前置胎盘的13.79%(12/87),有前次剖宫产史者占83.33%(10/12),凶险型前置胎盘并胎盘植入至原子宫切口瘢痕处3例,占25.00%(3/12).植入组前次剖宫产史率明显高于对照组(χ2=17.789,P<0.01).结论 随着剖宫产率的提高,前置胎盘合并胎盘植入发生率也在不断升高,前置胎盘合并胎盘植入的发生与瘢痕子宫密切相关,因此要重视对其进行早期诊断及合理治疗,改善母婴结局.%Objective To investigate the risk factors, clinical features, diagnosis and treatment of placenta previa complicated with placenta accrete. Methods 12 cases of placenta previa complicated with placenta accreta diagnosed in Rizhao Hospital of Traditional Chinese Medicine in recent 4 years were analyzed. Results Among 8 964 deliveries, the incidence of placenta previa was 0.97% ( 87/8 964 ). All of 87 cases of placenta previa were multiple pregnancy women. Multipara occupied 58.62%( 51/87 ) and elder gravida occupied 65.52% ( 57/87 ). The incidence of placenta previa complicated with placenta accreta was 0.13%( 12/8 964 ), occupying 13.79%( 12/87 ) of the placenta previa. Patients with previous cesarean section histrory accounted for 83.33%( 10/12 ). There were 3 cases of dangerous placenta previa complicated with placenta accreta at original uterine incesion scar, occuping 25.00% ( 3/12 ). The rate of previous cesarean section histroy in the group with placenta accreta was obviously higher than that in control group ( X2 = 17. 789, P < 0.01 ). Conclusion The

  6. 前置胎盘胎盘植入研究进展%Research Progress on the Placenta Accrete of Placenta Previa

    Institute of Scientific and Technical Information of China (English)

    池一婵; 隗伏冰(综述); 唐莉(审校)

    2015-01-01

    前置胎盘是常见的妊娠晚期出血性疾病,可危及母儿生命。胎盘植入与前置胎盘、剖宫产史等因素高度相关。出血多且采取保守治疗无效时应及时行子宫切除术。对于凶险性前置胎盘要引起高度重视,切实做好术前准备、术中有效处理,以减少出血量及子宫切除率。该文就前置胎盘胎盘植入病因、对母儿影响、临床表现及诊断、治疗、预防等方面的研究进展予以综述。%Placenta previa is one of the most common hemorrhagic diseases in late trimester of preganancy ,it may threaten the maternal and fetal life .Placenta accrete is associated with previous cesarean section and pla-centa previa,hysterectomy would be performed if massive bleeding could not be alleviated with conservative treatment.Dangerous type of placenta previa should be paid a lot of attention ,in order to make necessary pre-operative preparation and conduct effective intraoperative treatment to control massive bleeding and hysterec-tomy rate.Here is to make a review of the research progress on the pathogenesis,impact on mothers and infants,clinical manifestations,diagnosis,treatment,and prevention of placenta previa.

  7. Clinical analysis of 20 cases of pernicious placenta previa%凶险性前置胎盘20例临床分析

    Institute of Scientific and Technical Information of China (English)

    李晓云; 曹永利

    2013-01-01

    Objective To study the diagnosis and preventive measures of pernicious placenta previa. Methods The clinical data of 20 patients with pernicious placenta previa in our hospital during the period from Dec. 2004 to Dec. 2012 were retrospectively analyzed. Results Of the 20 patients with pernicious placenta previa, 18 pa-tients had the amount of bleeding more than 500 ml, including 6 cases of placenta implantation and 5 cases of uterine resection. All the patients discharged after proper treatment. Conclusion For the patients with pernicious placenta previa, early diagnosis and early treatment, and perioperative treatment can improve the maternal and child pregnancy outcome.%目的 探讨凶险性前置胎盘的诊断和防治措施.方法 回顾性分析2004 年12 月至2012 年12 月期间我院诊治的20 例凶险性前置胎盘患者的临床资料.结果 20 例患者中18 例出血量≥500 ml,6 例胎盘植入,5 例子宫切除,经过对症处理后,本组患者均痊愈出院.结论 尽早诊断、尽早治疗,并做好围术期的处理是改善凶险性前置胎盘患者母婴妊娠结局的关键.

  8. Clinical analysis on 23 cases of pernicious placenta previa%凶险型前置胎盘23例临床分析

    Institute of Scientific and Technical Information of China (English)

    卢昆林; 胡燕; 曹清

    2012-01-01

    Objective To improve the understanding of the pernicious placenta previa by analyzing the harm of the pernicious placenta previa to the pregnant women. Methods Retrospectively analyzed the data from 23 cases with the pernicious placenta previa, 8 cases in placenta accreta group and 15 cases in non-placenta accreta group were compared and analyzed. Results The incidence , the amount of postoperative hemorrhage and the incidence of cesarean hysterectomy in placenta accreta group were significant higher than that of non-placenta accreta group ( P < 0. 01). Conclusion Pernicious placenta previa with placenta accreta can cause great physical and mental harm to the pregnant women, mastering cesarean indications correctly to reduce cesarean section rate was the key point of reducing the incidence of pernicious placenta praevia.%目的 分析凶险型前置胎盘对孕妇的危害性,提高对凶险型前置胎盘的认识.方法 回顾性分析23例凶险型前置胎盘孕妇的临床资料,将其分为植入组8例,非植入组15例进行对比分析.结果 胎盘植入组产后出血发生率、产后出血量及子宫切除率与非植入组比较明显增高(P<0.01).结论 植入型凶险型前置胎盘给产妇生理、精神造成巨大伤害.掌握好剖宫产指征从而降低剖宫产率是减少凶险型前置胎盘发生的关键.

  9. 56 Patients with Placenta Previa Cesarean Delivery Operation%前置胎盘患者56例剖宫产手术观察

    Institute of Scientific and Technical Information of China (English)

    刘帅; 刘颖; 刘莉; 刘明盛; 陈娇

    2015-01-01

    目的:探讨剖宫手术在前置胎盘治疗中的临床价值。方法选择我院2011年1月至2014年1月妇产科收治入院的进行剖宫产术的56例前置胎盘患者的临床资料进行回顾性分析。分别比较前置胎盘患者的产后出血量、胎盘前置的不同类型以及胎盘的粘连植入情况,观察患者的手术治疗效果。结果在56例前置胎盘患者中,中央型前置胎盘32例,占57.14%;边缘型前置胎盘9例,占16.07%;部分型前置胎盘15例,26.79%。胎盘发生粘连和(或)植入的患者有33例,占58.93%;中央型前置胎盘患者产后出血量明显多于边缘型与部分型前置胎盘患者(P<0.05);56例患者均为剖宫产术,患者均止血成功,有3例患者因产后出血按摩子宫,注射宫缩药物、结扎子宫动脉和髂内动脉均无效而切除子宫,且全为中央型前置胎盘患者,有2例合并胎盘粘连或植入,1例产后肠梗阻。新生儿57例全部存活。早产儿17例。足月儿39例。2例低体质量儿(35+4周,37+4周)。结论剖宫产术是治疗前置胎盘,保证母儿安全的重要方法。%Objective To study the caesarean section palace in a clinical value in the treatment of placenta previa. Methods Our hospital between January 2011 and January 2014 maternity admitted during the period of cesarean section of the clinical data of 56 patients with placenta previa were retrospectively analyzed. Postpartum haemorrhage amount of patients with placenta previa were compared, the different types of placenta previa and adhesion of the placenta implantation, observe effect of surgical treatment for patients. Results in the 56 patients with placenta previa, central type of placenta previa 32 cases, accounting for 57.14%;borderline placenta previa, 9 cases (16.07%);some type of placenta previa, 15 cases by 26.79%. Placenta conglutination and (or) of patients implanted with 33 cases, accounted for 58.93%;the central

  10. Effect of low B-Lynch suture on menstrual cycle recovery and sex hormone levels in patients after cesarean section for placenta previa

    Institute of Scientific and Technical Information of China (English)

    Su-Lan Zhang; Wan-Cheng Feng; Yan Mi

    2016-01-01

    Objective:To explore the effect of low B-Lynch suture on the menstrual cycle recovery and sex hormone levels in patients after cesarean section for placenta previa.Methods:A total of 40 patients who were admitted in our hospital from August, 2013 to August, 2015 for cesarean section due to placenta previa were included in the study and randomized into the observation group and the control group. The patients in the observation group were given low B-lynch suture, while in the control group, yarns were plugged in the uterus. The bleeding during operation and 24 h after operation, the postpartum lochia duration, and menstrual cycle recovery in the two groups were observed. The postpartum FSH, E2, and LH levels in the two groups were determined.Results:The amount of bleeding during operation and 24 h after operation in the observation group was significantly less than that in the control group (P0.05). The comparison of FSH, E2, and LH levels between the two groups was not statistically significant (P>0.05).Conclusions:Low B-Lynch suture can effectively reduce the amount of bleeding after cesarean section for placenta previa, and has no effect on the menstrual recovery and ovarian function with a simple operation and less postoperative complications; therefore, it deserves to be widely recommended in the clinic.

  11. Clinical analysis on 45 cases of pernicious central placenta previa%凶险型中央性前置胎盘45例临床分析

    Institute of Scientific and Technical Information of China (English)

    黄蕾; 杨晓

    2015-01-01

    Objective To investigate the high risk factors and treatment outcome of pernicious central placenta previa. Methods A total of 45 cases of pernicious central placenta previa in our hospital from October 2011 to February 2014 were se-lected. Then the retrospective analysis was performed on the age,gestational week,abortion times,cesarean delivery times,com-plicating placenta increta rate,intraoperative and postoperative bleeding volume and treatment outcome. Results The incidence rate of pernicious central placenta previa complicating placenta increta was 26.67%(12/45);the predilection high risk factors of pernicious central placenta previa complicating placenta increta included abortion times greater than or equal to twice ,cesarean section times greater than or equal to twice ,and placenta adhesion and bleeding history found in previous operation;the occur-rence rate of above factors,and intraoperative and postoperative bleeding volume with 1 000-3 000 mL and more than 3 000 mL in pernicious central placenta previa complicating placenta increta were significantly higher than those without complicating pla-centa increta,the difference was statistically significant(P3000 mL的发生率明显高于未植入者,差异均有统计学意义(P<0.05);45例患者均采用手术治疗,其中子宫切除率达26.67%(12/45),并发胎盘植入者的子宫切除率为66.67%(8/12)。结论瘢痕子宫是发生胎盘植入的主要高危因素,容易形成凶险型中央性前置胎盘,对母婴危害极大,及时采取有效的预防措施及适时实施子宫切除术能有效减少产后出血率,避免产妇死亡。

  12. Clinical Analysis of 32 Dangerous Placenta Previas%32例凶险性前置胎盘的临床分析

    Institute of Scientific and Technical Information of China (English)

    陈洁

    2013-01-01

    Objective To analyze the causes and consequences of clinical analysis of dangerous placenta previa in order to the recognition of this one and have better precaution and therapy methods to it.Methods We have retrospective clinical analysis on 32 dangerous placenta previa examples from January 2000 to December 2009 in our hospital.Results 32 dangerous placenta previa examples are diagnosed by clinical manifestation of indolence vaginal bleeding and B-ultrasound.Most of these ones is operated by C-sect until foetus are matured. Conclusion Along with the height of C-sect rate,the rate of clinical dangerous placenta previa is heightened and the rate of postnatal hemorrhage is heightened.It harms to mother and baby.So only have we to grasp C-sect indication and decrease C-sect rate,we will decrease the rate of clinical dangerous plcenta previa.%目的分析凶险型前置胎盘病因和后果,提高对凶险型前置胎盘的认识,而更好地预防和治疗。方法对2000年1月~2011年12月收治的32例凶险型前置胎盘进行回顾性分析。结果32例凶险性前置胎盘主要是通过无痛性阴道出血的临床表现和B超确诊,大部分经过期待治疗至胎儿成熟而剖宫产终止妊娠。结论近年来随着剖宫产率的上升,凶险型前置胎盘发生率也随之急剧上升,发生产后大出血的几率增高,严重危害母婴安全。所以只有严格掌握剖宫产指征,定期产检,才是减少该病发生的关键。

  13. Value Diagnosis of Placenta Previa MRI%磁共振成像在前置胎盘诊断中的价值分析

    Institute of Scientific and Technical Information of China (English)

    赵嵩; 陈志敏; 安莲英; 彭丽霞; 崔蕾蕾; 许志琴

    2016-01-01

    目的:探讨磁共振成像(MRI)对前置胎盘的诊断价值,为评估预后而提供依据。方法回顾性分析58例前置胎盘患者的临床资料,其中26例前置胎盘患者并发胎盘植入;对所有患者进行MRI及超声检查,并分析对比MRI及超声检查对前置胎盘的诊断符合情况;将58例前置胎盘患者是否并发胎盘植入进行分组,分为胎盘植入组和对照组,对比两组患者的MRI影像特征,分析前置胎盘并发胎盘植入的特异性MRI影像特征。结果 MRI对前置胎盘的诊断符合率为100%,未出现漏诊及误诊的病例,超声对前置胎盘的诊断符合率为79.31%,其中漏诊1例,误诊11例;MRI与超声对前置胎盘的诊断符合率具有显著性差异(P<0.05);胎盘植入组和对照组的MRI影像特征对比,胎盘植入组和对照组的子宫下段变形或局部隆起、T2WI像出现低信号暗带、植入局部流空血管影增多均具有统计学差异(P<0.05)。结论 MRI对前置胎盘的诊断价值显著大于超声,诊断符合率高,且并发胎盘植入的患者具有特征性MRI征象,有利于评估前置胎盘的预后,为临床及时采取干预措施而提供依据。%Objective To investigate the magnetic resonance imaging (MRI) of the diagnostic value of placenta previa, and provide the basis for assessing the prognosis. Methods Retrospective analysis of clinical data of 58 cases of patients with placenta previa, in which 26 cases of patients with placenta previa placenta accreta, all patients MRI and ultrasound, and the analysis and comparison of MRI and ultrasonography in the diagnosis of placenta previa compliance, the 58 cases of patients with placenta previa combined with placenta implantation whether grouped into placental implantation and control groups, comparing MRI imaging features two groups of patients, analytical specificity MRI imaging features of placenta previa placenta accreta.Results MRI in the

  14. 前置胎盘类型与妊娠结局的相关性分析%The correlation analysis of placenta previa and pregnancy outcomes

    Institute of Scientific and Technical Information of China (English)

    何静

    2013-01-01

    目的 探讨前置胎盘(PP)类型与妊娠结局的相关性,为临床前置胎盘患者的诊断和处置提供依据.方法 本研究选取2010年1月-2011年12月间在我院进行产前超声诊断为胎盘前置,并最后诊断为胎盘前置的96例患者作为研究对象.从前置类型来看,将患者分为完全性(36例)、部分性(43例)、边缘性(17例)3组.观察并比较3组患者的临床特征、母亲妊娠结局和围生儿结局.结果 完全性组的年龄、孕次和剖宫产史率高于边缘性和部分性,方差分析显示,3组间的差异均具有统计学意义(P<0.05).不同前置胎盘类型在胎盘粘连、胎盘植入、产后出血和子宫切除间的差异均具有统计学意义(P<0.05).完全性前置胎盘组的新生儿窒息、围生儿死亡率和早产率间高于部分性组和边缘性组,卡方检验显示,3组间的差异均具有统计学意义(P<0.05).结论 完全性胎盘前置具有更差的妊娠结局和围生儿状况.因此,对于完全性前置胎盘患者,应加强产前保健和监护,并做好充分准备,以改善妊娠结局和围生儿状况.%Objective To investigate the correlation of placenta previa (PP) and pregnancy outcome,aimed at providing basis for clinical diagnosis and management of placenta previa. Methods 96 placenta previa patients treated and final diagnosed in This study selected in January 2010 -December 2011 in our hospital were selected in our study. All patients were divided into completely (36 cases) group,partial (43 cases) group and marginal (17 cases) group. The clinical characteristics, maternal outcome of pregnancy and perinatal child outcome of three groups were observed and compared. Results The age,pregnancies and history of cesarcan section rate of complete group is higher than the marginal and partial groups. Analysis of variance showed the differences among the three groups were statistically significant (P <0. 05). The placenta accreta, placenta accrcta

  15. 凶险性前置胎盘129例临床分析%Clinical analysis of 129 cases of pernicious placenta previa

    Institute of Scientific and Technical Information of China (English)

    米热阿依・尕依提; 焦永慧

    2015-01-01

    Objective To analyze the clinical characteristics of pernicious placenta previa and its harm to moth‐ers and infants ,so as to deepen understanding of it .Methods To retrospectively analyze pregnant women‐related fac‐tors and pregnancy outcomes of 129 cases of pernicious placenta previa between central type of placenta previa group and non‐central type of placenta prvia group form January 2012 to June 2014 .Results Compared with the non‐cen‐tral type of placenta previa group ,the time from last pregnancy was statistically shorter and the time for the first va‐ginal bleeding during this pregnancy was statistically sooner in the central type of placenta previa group (P 0 .05) .Conclusion Central type of pernicious placenta previa has significantly more bleeding volume and is more liable to acquire placenta increta and DIC with much harm to mothers and infants .So ,diagnosis and operation‐related preparation before the operation , cooperation between different departments ,operation technique and control bleeding during the operation are vital to the effective treatment .In addition ,strictly mastering indications of cesarean section ,reducing rate of cesarean sec‐tion ,doing well birth control and decreasing times of abortion can effectively prevent occurrence of pernicious placenta previa .%目的:分析凶险性前置胎盘的临床特点及对母婴的危害性,进一步提高对凶险性前置胎盘的认识。方法对2012年1月至2014年6月新疆维吾尔自治区人民医院收治的129例凶险性前置胎盘中的中央型组与非中央型组孕产妇相关因素及妊娠结局进行回顾性分析。结果凶险性前置胎盘中央型与非中央型距前次妊娠间隔及发生产前出血时间差异有统计学意义(P<0.05),流产次数、剖宫产次数、术中出血量、弥散性血管内凝血(DIC)发生率、胎盘植入率及子宫切除率比较差异有统计学意义(P<0.05),两组孕妇年龄

  16. Exploration on pregnancy outcomes of patients with pernicious placenta previa%凶险型前置胎盘的妊娠结局探讨

    Institute of Scientific and Technical Information of China (English)

    卢红梅; 孙丽洲

    2014-01-01

    目的:探讨凶险型前置胎盘产妇的妊娠结局及对围生儿的影响。方法回顾性分析282例前置胎盘产妇的临床资料,根据有无剖宫产史分为凶险型前置胎盘46例和非凶险型前置胎盘236例,比较分析两组间剖宫产、产后出血、胎盘粘连、胎盘植入、子宫切除等发生率,以及两组间早产、新生儿出生体重、Apgar评分、新生儿死亡等指标的差异。结果①凶险型组产妇产后出血、胎盘植入、子宫切除的发生率均显著高于非凶险型组(χ2值分别为42.336、58.509、27.957,均P<0.01),而两组间剖宫产和胎盘粘连的发生率差异无统计学意义(χ2值分别为3.088、3.864,均P>0.05);②凶险型组新生儿早产发生率显著高于非凶险型组(χ2=31.090,P<0.01),新生儿出生体重显著低于非凶险型组(t=13.368,P<0.01),而两组间新生儿出生1分钟、5分钟Apgar评分比较无统计学差异( t 值分别为1.970、1.493,均P>0.05)、新生儿死亡率比较差异无统计学意义(χ2=0.693,P>0.05)。结论凶险型组产后出血、胎盘植入、子宫切除及早产的发生率显著高于非凶险型组,医生应注重对有剖宫产史孕妇的孕期管理及病情评估,并适时进行预防性处置是改善母儿妊娠结局的有效手段。%Objective To explore the pregnancy outcomes of patients with pernicious placenta previa and the perinatal influence.Methods A retrospective analysis was conducted on clinical data of 282 puerperas with placenta previa.They were divided into pernicious placenta previa group (46 cases) and non-pernicious placenta previa group (236 cases) according to the history of cesarean section and placental location.The incidences of cesarean section, postpartum hemorrhage, placenta adherence, placenta implantation and uterine excision were compared between two groups, and the differences in

  17. Clinical analysis of placenta previa cesarean delivery in 52 cases%前置胎盘剖宫产52例临床分析

    Institute of Scientific and Technical Information of China (English)

    王蕾

    2015-01-01

    目的:探讨前置胎盘剖宫产术中子宫切口方式和出血量之间的关系。方法:2012年1月-2013年1月收治前置胎盘剖宫产孕妇52例,比较不同子宫切口与相应的出血量。结果:直接切开胎盘组出血量最多,切开胎盘组与推开胎盘组和避开胎盘组比较,出血量均有显著性差异。结论:前置胎盘剖宫产术前应做B超检查明确胎盘位置,采用避开胎盘的子宫切口以减少术中出血量,减少母婴并发症。%Objective:To explore the relationship between intraoperative uterine incision approach between bleeding amount of placenta previa cesarean delivery.Methods:52 pregnant women with placenta previa cesarean delivery were selected from January 2012 to January 2013.The different uterine incisions and the corresponding blood amounts were compared.Results:The bleeding amount of directly cutting placenta group was largest,the cutting placenta group was compared with the pushing placenta group and the avoiding placenta group,the bleeding volume were significantly different.Conclusion:Placenta previa cesarean section should make B ultrasound examination before operation to clear the placenta.Using avoiding placenta uterine incision reduce intraoperatve blood volume,reduce the complications of mothers and infants.

  18. The process of placenta previa in mid-pregnancy induction of labor%中期妊娠引产胎盘前置的处理

    Institute of Scientific and Technical Information of China (English)

    王蕴慧

    2012-01-01

    中期妊娠胎盘前置引产过程面临大量出血的风险,引产前细致的超声检查是发现胎盘前置类型的必要措施,有条件者行MRI检查有助于鉴别是否存在胎盘植入.引产方式可选择依沙吖啶羊膜腔注射、米非司酮+米索前列醇引产.引产前应做好输血输液准备并应在有剖宫取胎及子宫切除术技术条件的医院实施.完全性前置胎盘状态或伴有胎盘植入者推荐子宫动脉栓塞联合依沙吖啶或米非司酮加米索前列醇引产.%Women with placenta previa in second-trimester pregnancy have a high risk of serious bleeding during induced labour. Before induced labour, careful ultrasonography is a necessary screening test in order to find placenta previa, and MRI is useful in diagnosing whether complicated with placenta accre-ta. Rivanol or mifepristone-misoprostol can be chose. Sufficient blood and liquid should be prepared before induced labor and it should be done in the hospital which can provide emergency cesarean section or hysterectomy. Uterine artery embolization (UAE) combining with rivanol or mifepristone-misoprostol is recommended for women with central placenta previa or placental accreta.

  19. Cateterismo cardíaco por acceso radial percutáneo en pacientes con disección humeral previa

    Directory of Open Access Journals (Sweden)

    Eduardo Magariños

    2013-02-01

    Full Text Available La punción percutánea de la arteria radial para la realización de procedimientos por cateterismo ha ganado mayor aceptación en los últimos tiempos. Esto sucedió como consecuencia de haber alcanzado resultados similares a los obtenidos mediante el acceso femoral, con los beneficios de una menor tasa de complicaciones y mayor confort de los pacientes. Recientemente, su utilización tomó un impulso adicional, por estar asociada a mejor pronóstico en síndromes coronarios agudos. En el presente trabajo hemos evaluado si la factibilidad, resultados y ventajas relacionadas al acceso percutáneo de la arteria radial en procedimientos por cateterismo, se aplican también a quienes presentan disección previa de la arteria humeral. Sobre un total de 1 356 accesos radiales percutáneos, 53 fueron en pacientes con disección previa de la arteria humeral, obteniéndose éxito del acceso en el 96.2% (51/53 de las punciones. A través de estos accesos se realizaron 71 procedimientos por cateterismo, con 93.6% (44/47 de éxito del procedimiento en las intervenciones diagnósticas y 100% (24/24 en las terapéuticas. En este grupo no ocurrieron complicaciones mayores. Las complicaciones menores sucedieron en el 1.4% (1/71 de los casos y no se registraron nuevas complicaciones en el seguimiento a siete días. Si bien el grupo es pequeño, consideramos que resulta suficiente para mostrar que las punciones percutáneas de la arteria radial para la realización de procedimientos por cateterismo, en pacientes con disección previa de la arteria humeral, son factibles y permiten elevadas tasas de éxito con baja frecuencia de complicaciones.

  20. Increased levels of cell-free human placental lactogen mRNA at 28-32 gestational weeks in plasma of pregnant women with placenta previa and invasive placenta.

    Science.gov (United States)

    Kawashima, Akihiro; Sekizawa, Akihiko; Ventura, Walter; Koide, Keiko; Hori, Kyouko; Okai, Takashi; Masashi, Yoshida; Furuya, Kenichi; Mizumoto, Yoshifumi

    2014-02-01

    We compared the levels of cell-free human placental lactogen (hPL) messenger RNA (mRNA) in maternal plasma at 28 to 32 weeks of gestation between women with diagnosis of placenta previa or invasive placenta and women with an uneventful pregnancy. Sensitivity and specificity of hPL mRNA for the prediction of invasive placenta were further explored. Plasma hPL mRNA were quantified by real-time reverse-transcriptase polymerase chain reaction in women with placenta previa (n = 13), invasive placenta (n = 5), and normal pregnancies (n = 92). Median (range) hPL mRNA was significantly higher in women with placenta previa, 782 (10-2301) copies/mL of plasma, and in those with invasive placenta, 615 (522-2102) copies/mL of plasma, when compared to normal pregnancies, 90 (4-4407) copies/mL of plasma, P placenta among women with placenta previa. In conclusion, expression of hPL mRNA is increased in plasma of women with placenta previa and invasive placenta at 28 to 32 weeks of gestation.

  1. Treatment and nursing experience of patients with placenta previa antepartum haemorrhage%前置胎盘产前出血患者治疗护理体会

    Institute of Scientific and Technical Information of China (English)

    刘鹏

    2014-01-01

    To analyze the treatment and nursing experience of patients with placenta previa antepartum haemorrhage. Methods:36 cases with placenta previa antepartum haemorrhage were selected from January 2012 to January 2014.They were given symptomatic treatment.The nursing measures were summarized and analyzed.Results:In 36 cases with placenta previa antepartum haemorrhage,after timely and effective treatment,scientific and rational nursing intervention,no 1 case died.The incidence rate of postpartum hemorrhage was significantly reduced,and the postpartum hemorrhage also had been effectively controlled.At the same time,no 1 neonatal died,and the survival rate was 100%.Conclusion:Overall strengthening the rescue and nursing measures of placenta previa antepartum haemorrhage have the positive significance to guarantee the maternal and child health and safety,and improve the cure rate.%目的:探讨前置胎盘产前出血患者的治疗护理体会。方法:2012年1月-2014年1月收治前置胎盘产前出血患者36例,给予对症治疗,并就护理措施进行总结、分析。结果:本组36例前置胎盘产前出血患者,在经过及时、有效的治疗以及科学、合理的护理干预后,无1例患者死亡;且产后大出血发生率明显减少;而产前出血也得到了有效的控制。同时,新生儿也无1例死亡,存活率100%。结论:全面加强前置胎盘产前出血患者的救护措施,对保障母婴健康、安全,提高治愈率具有积极的意义。

  2. Decrease of uteroplacental blood flow after feticide during second-trimester pregnancy termination with complete placenta previa: quantitative analysis using contrast-enhanced ultrasound imaging.

    Science.gov (United States)

    Poret-Bazin, H; Simon, E G; Bleuzen, A; Dujardin, P A; Patat, F; Perrotin, F

    2013-11-01

    Contrast enhanced ultrasound (CEUS) was used to quantify the dynamic changes in uteroplacental blood flow before and after the interruption of fetal villus circulation resulting from feticide during a second trimester pregnancy termination in a patient with complete placenta previa. Quantitative analysis was performed on time-intensity curves acquired 24 h before and 48 h and 120 h after feticide and demonstrated the persistence of utero-placental blood flow with a progressive and two-step reduction in intervillous space and uteroplacental blood flow. Our results suggest that placental blood flow reduction after interruption of fetal circulation is a progressive and delayed mechanism.

  3. La encuesta previa valorada, herramienta para optimizar la comprensión ecológica en titulaciones de la UA

    OpenAIRE

    Candela i Quesada, José; Pastor-López, Antonio; Pérez Lahiguera, José Antonio; Tomás Sánchez, José Enrique de; Valero Falcó, Francesc; Samper Falcó, Luis Enrique; Seva Román, Eduardo; Arques Pina, José; Barrero Vázquez, Francisco

    2013-01-01

    La importancia de tener conceptos claros en Ecología resulta esencial en todas las titulaciones universitarias cuyos profesionales participan en la gestión medioambiental. En la UA los grados en Biología, Química, Geología, Turismo, Ingeniería de Caminos, Geografía y Sociología presentan asignaturas en distintos niveles relacionadas directamente con la Ecología. Esta contribución valora la importancia de realizar una encuesta previa valorada a los alumnos, para optimizar la eficacia del proce...

  4. ClinicalAnalysisofDangerousPlacentaPreviaComplicatedwithPlacentaAccreta%凶险性前置胎盘并发胎盘植入的临床分析

    Institute of Scientific and Technical Information of China (English)

    王凌燕

    2013-01-01

    目的探讨凶险性前置胎盘并发胎盘植入的发病率、诊断方法、治疗及预防措施。方法对我院65例凶险性前置胎盘进行回顾性分析,其中并发胎盘植入29例。结果本研究凶险性前置胎盘并发胎盘植入发生率为44.62%(29/65),其产后出血量>2000mL发生率、弥漫性血管内凝血(DIC)发生率、产褥感染率及子宫切除率高于未并发胎盘植入者;早产率及新生儿预后情况两者无显著差异(P>0.05)。结论凶险性前置胎盘并发胎盘植入者,产后出血量大,易致失血性休克、DIC、产褥感染,增加子宫切除风险;降低剖宫产率,是减少凶险性前置胎盘并发胎盘植入的关键。%Objective To discuss the incidence, diagnostic methods ,treatment methods and prevention of dangerous placenta previa complicated with placenta accreta. Methods Retrospective analysis 65 cases of dangerous placenta previa admitted to our hospital in June 2007-2012, including 29 cases complicated with placenta accreta. Results In the present study the incidence rate of dangerous placenta previa complicated with placenta accreta was 44.62%(29/65). The postpartum incidence and hemorrhage, the incidence of disseminated intravascular coagulation (DIC), puerperal infection rate and the rate of hysterectomy of dangerous placenta praevia complicated with placenta accreta in patients was more than not complicated with placenta accreta in patients. The rate of preterm birth and neonatal prognosis has no signiifcant difference between them (P>0.05). Conclusion Dangerous placenta praevia complicated with placenta accreta in patients have a high incidence of postpartum hemorrhage, prone to cause hemorrhagic shock, DIC, puerperal infection, increase the risk of uterine resection. The key to reduce the dangerous placenta previa complicated with placenta accreta is reducing the rate of cesarean section.

  5. Rentabilidad diagnóstica de la tomografía computarizada de alta resolución en la valoración previa al trasplante pulmonar.

    OpenAIRE

    Pérez Enguix, Daniel Bernardo

    2007-01-01

    RESUMEN OBJETIVOS: Establecer la rentabilidad diagnóstica de los estudios de tomografía computarizada de alta resolución (TCAR) en la valoración previa al trasplante pulmonar. MATERIAL Y METODOS: Se ha realizado un estudio prospectivo en el transcurso de dos años, sobre una población de 81 pacientes remitidos al hospital La Fe de Valencia como posibles candidatos a trasplante pulmonar y cardio-pulmonar. De esta población se ha seleccionado una muestra de 71 pacientes cuya indicaci...

  6. 前置胎盘合并剖宫产史临床分析%Clinical analysis of placenta previa complicated with previous caesarean section

    Institute of Scientific and Technical Information of China (English)

    马良坤; 韩娜; 杨剑秋; 边旭明; 刘俊涛

    2012-01-01

    目的 探讨前置胎盘合并剖宫产史患者的临床特点及处理.方法 回顾性分析2003年1月至2011年10月北京协和医院前置胎盘合并剖宫产史(再次剖宫产组,RCS组)患者母婴结局,并与同期前置胎盘行初次剖宫产(初次剖宫产组,FCS组)进行比较.结果 RCS组及FCS组分别有29例及243例患者.两组的平均年龄、孕周差异无统计学意义(P>0.05).RCS组患者手术时间长,产后出血量多,早产、产后出血、胎盘植入、输血、弥漫性血管内凝血和产科子宫切除的发生率均高于FCS组,差异有统计学意义(P<0.05),RCS组早产儿、新生儿窒息发生率及围产儿死亡率均高于FCS组(P<0.05).结论 前置胎盘合并剖宫产史更易发生胎盘植入,产后出血、产科子宫切除及围产儿病率高,需要高度重视.%Objective To investigate the clinical features and treatment of placenta previa complicated with previous caesarean section. Methods Twenty - nine cases of placenta previa complicated with previous caesarean section (RCS group) treated in Peking Union Medical College Hospital from 2003 to 2011 were retrospectively reviewed and compared with 243 cases of placenta previa complicated without previous caesarean section (FCS group) at the same time. Results The mean age and the average gravidity of RCS group and FCS group had no difference. The RCS group had longer operation time, more preterm birth, postpartum hemorrhage volume, blood transfusion, placenta accreta, disseminated intravascular coagulation and obstetric hysterectomy than FCS group (Pprevia with previous caesarean section has more placenta accreta, postpartum hemorrhage, obstetric hysterectomy and perinatal morbidity rate. We need to pay more attention to these cases.

  7. Pregnancy Complications: Placenta Previa

    Science.gov (United States)

    ... labor & premature birth The newborn intensive care unit (NICU) Birth defects & other health conditions Loss & grief Tools & ... labor & premature birth The newborn intensive care unit (NICU) Birth defects & other health conditions Loss & grief Ask ...

  8. Uterine Healing after Therapeutic Intrauterine Administration of TachoSil (Hemostatic Fleece in Cesarean Section with Postpartum Hemorrhage Caused by Placenta Previa

    Directory of Open Access Journals (Sweden)

    Katrine Fuglsang

    2012-01-01

    Full Text Available Background. Application of hemostatic fleece (TachoSil directly onto the bleeding surfaces of the lower uterine segment has been used to obtain hemostasis during cesarean section caused by placenta previa. Methods. Eleven of 15 patients treated with TachoSil for excessive postpartum haemorrhage due to placenta previa were enrolled. An evaluation of the cesarean section scar by transvaginal ultrasound, the uterine cavity and endometrium by hysteroscopy, and the endometrium by biopsy were made. The main outcome measures were intrauterine adhesions, recovery of endometrium at the site of TachoSil application, visible remnants of TachoSil, and scar healing. Results. Eight patients had small remnants of TachoSil in the uterine cavity together with signs of resorption. All had a normal endometrial mucosa, and none had adhesions in the uterine cavity. All cesarean section scars were healed without defects. Conclusion. TachoSil did not seem to impair healing of the endometrium or scar formation in the uterus after intrauterine application. Resorption of TachoSil seems to progress individually. Intrauterine treatment with TachoSil is a valuable supplement to the traditional treatment of post partum haemorrhage and may help retain reproductive capability. This is a small study, and it will require more studies to confirm the reproducibility.

  9. Los dilemas del Estado peruano en la implementación y aplicación de la Ley de Consulta Previa en los Andes peruanos

    Directory of Open Access Journals (Sweden)

    Rafael Barrio de Mendoza

    2013-12-01

    Full Text Available La promulgación de la Ley de Consulta Previa a los Pueblos Indígenas u Originarios como mecanismo estatal de participación e inclusión social ha generado debates conceptuales sobre cómo identificar a la población indígena andina. ¿Por qué esta ley tiene dificultades para otorgar a la población andina derechos indígenas a la consulta previa? El presente artículo intenta responder a esta interrogante a partir de un recuento histórico de las formas de identidad andina y de un análisis del debate conceptual internacional sobre la indigeneidad". Argumentamos que el problema radica en que la aplicación de la ley estructura un modelo de reconocimiento indígena especialmente restrictivo que no recoge de manera adecuada el dinamismo y complejidad existentes en las formas de adscripción identitaria en los Andes.

  10. El rol de la empresa transnacional extractiva de petróleo en la consulta previa con las comunidades indígenas: La experiencia en Colombia

    Directory of Open Access Journals (Sweden)

    Yadira Castillo Meneses

    2012-01-01

    Full Text Available Este artículo pretende reflejar el rol asumido por la empresa transnacional extractiva de petróleo en el marco de las consultas previas con las comunidades indígenas en Colombia, así como sus implicaciones. Sugiero tres puntos centrales: 1. Las empresas sustituyen el rol del Estado, y en esa medida pueden ser la primera fuente de conocimiento para las comunidades indígenas en relación con lo que supone y conlleva una consulta previa. 2. Gran parte de los compromisos asumidos por las empresas con la comunidad indígena están ligados a razones reputacionales y a un interés de contrarrestar la imagen de ser violadores de derechos humanos. 3. La consulta no está siendo realizada en el momento establecido por la Convención 169 de la OIT, lo cual tiene grandes consecuencias. La investigación consiste en una aproximación sociojurídica a un caso concreto, en la cual se integran las visiones de varias ETN, los entes del Estado involucrados en la consulta y el resguardo indígena Unuma del Vichada.

  11. 凶险型前置胎盘65例临床分析%CLINICAL ANALYSIS OF 65 CASES OF PERNICIOUS PLACENTA PREVIA

    Institute of Scientific and Technical Information of China (English)

    季淑英; 姬明杰; 李桂荣; 冯小明; 杨小杰

    2014-01-01

    Objective To analyze the clinical characters of pernicious placenta previa ,and to prepare well pre-operation ,choose appropriate operation manner ,reduce intraoperative blood loss ,decrease the proba-bility of metrectomy .Methods A retrospective analysis in 65 cases with pernicious placenta previa was performed ,the data of placenta accrete ,the rate of neonatal asphyxia ,probability of metrectomy and intra-operative blood loss were collected .The operation manner was chosen according to the characters of the placenta previa ,comparison of the probability of metrectomy and intraoperative blood loss between cases with different operation manner were performed .Results Forty -five from a total of 65 cases occurred placenta accrete ,7 cases of neonatal asphyxia and 6 cases of metrectomy .A total of 65 cases with perni-cious placenta previa were divided into 4 groups according to the treatment ,45 cases occurred placenta ac-crete ,7 cases of neonatal asphyxia and 6 cases of metrectomy .The intraoperative blood loss ,rate of me-trectomy and complication of maternal (DIC ,death) in group C ,which were treated by lower segment ce-sarean section after bilateral uterine artery chemoembolization induced by radiation ,were significantly lower than those from other 3 groups .Conclusion Pernicious placenta previa heavily threatens maternal ,a con-firmed preoperative diagnosis is necessary ,well preparation before operation and rescue measure for intrao-perative bleeding ,and interventional embolization w hen needed ,can reduce the complication and maternal mortality .%目的:分析凶险型前置胎盘的临床特点,如何充分术前准备,据病情选择适当的手术方式,减少术中出血,降低子宫切除几率。方法对65例凶险型前置胎盘病例胎盘植入情况、新生儿窒息率、子宫切除几率、术中出血情况等多项指标进行回顾性分析,根据术中胎盘前置及植入情况选择不同处理方式,并比较各种处

  12. Analysis of 32 cases of postpartum hemorrhage clinical review of placenta previa%前置胎盘产后出血32例临床诊疗回顾性分析

    Institute of Scientific and Technical Information of China (English)

    卜春梅

    2013-01-01

    Objective to investigate the clinical analysis of placenta previa bleeding treatment process and impact analysis for placenta previa bleeding factors. Methods retrospective analysis of 68 cases of placenta previa postpartum hemorrhage in our hospital from september 2010 to november 2013 admitted, and to observe the relationship between the type of placenta previa, placental area, the number of abortions and postpartum hemorrhage between. Results after clinical placenta previa postpartum hemorrhage in 68 patients in this group analysis found suffering from central placenta previa, placenta larger, too much will cause an increase in the number of abortions amount of postpartum hemorrhage. Conclusion the results of this study show that the incidence of placenta previa both for maternal or fetal life and health have resulted in a greater threat to pregnant women to reduce the pain and smooth production, the clinical response to placenta previa taken early detection, early treatment and proper the mode of delivery.%目的:探讨分析前置胎盘出血临床诊疗过程以及对于前置胎盘出血影响因素的分析。方法回顾分析我院在2011年09月至2013年11月内收治的32例前置胎盘产后出血患者,并观察前置胎盘的种类、胎盘面积、流产次数与产后出血量之间的关系。结果经过对本组32例前置胎盘产后出血患者的临床分析发现,患中央性前置胎盘、胎盘面积较大、流产次数过多会造成产后出血量的增加。结论本次研究结果表明,前置胎盘的发生无论对于产妇或者是胎儿的生命健康均造成了较大的威胁,为减少孕妇痛苦以及顺利生产,临床中应对前置胎盘采取早发现、早处理以及正确的分娩方式。

  13. Maternal factors influencing neonatal birth weight in placenta previa%前置胎盘患者新生儿出生体重的影响因素分析

    Institute of Scientific and Technical Information of China (English)

    单虹

    2015-01-01

    目的:探讨前置胎盘患者新生儿出生体重的影响因素。方法回顾性分析2011年1月至2014年12月响水县人民医院住院分娩的单胎妊娠前置胎盘60例患者的临床资料。前置胎盘患者作为研究组,同期无胎盘异常的单胎妊娠产妇60例为对照组。分析前置胎盘患者新生儿出生体重的影响因素。结果研究组新生儿出生体重低于对照组,差异有统计学意义( P<0.05)。研究组早产发生率明显高于对照组,差异有统计学意义( P<0.05)。结论前置胎盘患者分娩的新生儿出生体重较低,前置胎盘对新生儿出生体重的影响主要是由于早产的发生率升高。在前置胎盘患者,随分娩时孕周的增加,新生儿出生体重增加。%Objective To evaluate maternal factors influencing neonatal birth weight in placenta previa .Methods During the study period from Jan 2011 to Dec 2014, 60 singleton pregnancy women with placenta previa hospitalized in The People’ s Hospital of Xiangshui County were selected as study objects;60 singleton pregnancy women without placenta previa were randomly selected as control group.The characteristics of pregnant women and the birth weight of neonates were evaluated restrospctively .Statistical analysis using regression models was performed to analyzed the influence factors on neonatal weight in placenta previa .Results Neonates born after a pregnancy complicated with placenta previa had significantly lower birth weight ( P<0.05 ) .Women with placenta previa had higher incidence of preterm delivery (P<0.05).Conclusion Placenta previa is associated with low neonatal birth weight , and this association is chiefly due to preterm delivery .With the increase of gestational age , the neonatal birth weight increases accordingly in placenta previa .

  14. Clinical research on the different placenta previa type and bleeding in the pregnancy%不同前置胎盘类型与孕期出血状况临床研究

    Institute of Scientific and Technical Information of China (English)

    李富萍; 赵有红; 脱淑梅

    2012-01-01

    Objective To investigate the risk factors lead to the occurrence of placenta prevla and antepartum hemorrhage between different types of placenta previa. Methods To comparatively analyze 198 cases of placenta previa patients and 198 patients in the control group on risk factors for bleeding before 34 weeks and compare different types of placenta obstetric risk factors and the incidence of ari1.epar1.uiri haemorrhage. Results There were significantly differences in obstetric risk factors between placenta previa group and control group (P < 0.05), the difference was no statistically significant in the type of placenta previa (P > 0.05). The incidence of anteparlum haemorrhage in the type of placenta previa showed no significant difference (P > 0.05). Conclusion Obstetric risk factors is related to placenta previa, but is not related to the types of placenta previa; the type of placenta previa is not associated with antepartum bleeding.%目的 探讨导致前置胎盘发生的高危因素及不同类型前置胎盘产前出血状况.方法 采用回顾性病例对照研究设计,对比分析198例前置胎盘病例组和198例对照组有关危险因素,并比较不同胎盘类型的产科危险因素及孕34周前出血状况.结果 产科高危因素在前置胎盘组与对照组之间比较差异有统计学意义(P0.05);不同前置胎盘类型在孕34周前发生产前出血几率比较,差异无统计学意义(P>0.05).结论 产科高危因素与前置胎盘的形成有关,但与前置胎盘类型无关;前置胎盘类型并不能预测产前是否能发生突破性大出血.

  15. Reseña: Abal Oliú, Alejandro: C.G.P. y conciliación previa en materia laboral, Editorial Universidad Ltda. Montevideo, 1992, 64 págs.

    Directory of Open Access Journals (Sweden)

    o. C. R.

    2015-10-01

    Full Text Available Abal Oliú, Alejandro: C.G.P. y conciliación previa en materia laboral, Editorial Universidad Ltda. Montevideo, 1992, 64 págs. Editorial Universidad Ltda. Montevideo, 1992, 64 págs.El autor, profesor de Derecho Procesal y de Técnica Forense en nuestra Facultad, analiza en la presente obra las distintas fórmulas que es posible estab~ecer en cuanto a la tentativa de conciliación previa a la iniciación de los procesos laborales, luego de la entrada en vigencia del Código General del Proceso. (...

  16. 分析经腹部及会阴部超声联合诊断前置胎盘的诊断价值%The Analysis of Diagnostic Value of Placenta Previa in Abdominal Combined with Perineal Ultrasound

    Institute of Scientific and Technical Information of China (English)

    潘雪松; 李秋梅; 林进; 梁理娟; 李凤谊

    2016-01-01

    Objective:To analyze the diagnostic value of placenta previa in abdominal combined with perineal ultrasound.Method: 86 cases of placenta previa form May 2012 to June 2014 in our hospital were treated, they underwent transabdominal ultrasound and simple abdominal and perineal ultrasound combined diagnostic mode for testing. Recorded ultrasound diagnosis of patients with placenta previa and the coincidence rate of diagnosis, and the results were analyzed and compared.Result: Simple transabdominal ultrasound diagnostic results showed that low placenta was 16 cases, 3 cases misdiagnosis, marginal placenta previa 23 cases, 4 cases of misdiagnosis, partial placenta previa 4 cases, 7 cases misdiagnosed, 24 cases of central placenta previa ,5 cases misdiagnosis, the total rate was 77.9% in line with placenta previa. After abdominal perineal ultrasound diagnosis showed , low placenta was 19 cases, 26 cases of marginal placenta previa, 1 case misdiagnosis, 9 cases of partial placenta previa, 2 cases misdiagnosis, 28 cases of central placenta previa, 1 case misdiagnosis, the total placenta previa compliance rate was 95.3%. The partial placenta previa diagnostic of the study group program compliance rate was higher than the control group (P 0.05).The placenta previa diagnostic accuracy (95.3%) of the study group was significantly higher than the control group (77.9%), the difference was significant (χ2= 11.2927,P=0.0008). 68 cases of placenta previa maternal via abdomen perineum ultrasound detection showed that 25 cases of maternal placental thickening, 19 cases of complete placenta previa, 15 cases of placenta implantation , 4 cases of hysterectomy,6 cases of marginal placenta previa, vascular performance bulky, vascular branch to reduce low birth weight.Conclusion:Abdominal and perineal ultrasound combined diagnostic program has a high diagnostic value, it can improve the diagnosis of placenta previa compliance rate ,and it is suitable for long-term clinical application.%

  17. 凶险性前置胎盘伴胎盘植入处理体会%Treatment experience of dangerous placenta previa complicated with placenta accrete

    Institute of Scientific and Technical Information of China (English)

    周庆红; 周晓红

    2015-01-01

    目的:研究凶险性前置胎盘伴胎盘植入的诊断及治疗。方法:收治凶险性前置胎盘并胎盘植入孕妇18例,对其具体情况进行回顾分析。结果:产前彩超胎盘植入时检出率55.55%(10/18),10例行MRI检查,检出率100%(10/10),8例行“8”缝扎剥离面及结扎双侧子宫血管。7例行“8”缝扎剥离面及结扎双侧子宫血管后效果不佳,急行子宫动脉栓塞治疗,保留子宫成功。3例直接行子宫切除。结论:凶险性前置胎盘伴胎盘植入易产后出血,充分术前准备,个体化,多方式治疗,降低并发症。%Objective:To explore the diagnosis and treatment of dangerous placenta previa complicated with placenta accreta. Methods:18 cases of pregnant women with dangerous placenta previa complicated with placenta accreta were selected,the clinical data were retrospectively analyzed.Results:The detection rate of prenatal ultrasound placenta implantation was 55.55%(10/18),10 patients were given MRI examination,the detection rate was 100% (10/10),8 cases were given "8" suture wound surface and bilateral uterine vessel ligation.The effect of "8" suture wound surface and bilateral uterine vessel ligation in 7 cases was poor, they were given emergency uterine artery embolization treatment,uterus was successfully retained.3 patients were given hysterectomy.Conclusion:Postpartum hemorrhage in dangerous placenta previa complicated with placenta accreta was easy to occur,we should have adequate preoperative preparation and individualized treatment in many ways,so as to reduce the complications.

  18. 血管前置的产前超声筛查与诊断%Prenatal ultrasound screening and diagnosis of vasa previa

    Institute of Scientific and Technical Information of China (English)

    李胜利; 陈秀兰; 文华轩

    2011-01-01

    血管前置是导致围产儿死亡的一个危险因素,经阴道分娩围产儿死亡率高.超声检查是产前诊断血管前置最可靠且简便、易推广的检查方法.当产前超声检查发现低置胎盘、双叶胎盘、副胎盘、多叶胎盘、多胎妊娠、帆状胎盘等高危发病因素时,需详细检查宫颈内口,常规的检查方法是经腹超声检查,当因胎先露阻挡等原因显示宫颈内口不满意时,需结合经会阴超声检查或经阴道超声检查;经阴道超声检查是该3种检查方法中最可靠的显示方法,但合并阴道活动性出血或宫颈机能不全时不宜使用.对于产前诊断血管前置的病例,建议于临产前行选择性剖宫产术.%Vasa previa is a dangerous factor which may result in fetal demise. Vaginal delivery may lead to high fetal mortality. Ultrasound is the most reliable, simple and generalized way for diagnosis of prenatal vasa previa. If the following high risk factors are detected by prenatal ultrasound, such as low lying placenta, bi-lobed placenta, succenturiate lobe, multi-lobed placenta, multiple pregnancy and velamentous insertion of the cord, the internal cervical os is necassary for examination. Transabdominal ultrasound is the routine way to observe the internal cervical os. But if internal cervical os is not satisfied to observe internal cervical os because of fetal presentation,transperineal or transvaginal ultrasound is recommended. Transvaginal ultrasound is the most reliable way. However, it is not recommended to perform once the mother is complicated with active bleeding or cervical incompetence. Elective caesarean section should be offered prior to the onset of labour for cases that have been diagnosed of prenatal vasa previa.

  19. Attachment position of placenta previa and cesarean uterine incision%前置胎盘附着位置与剖宫产子宫切口选择

    Institute of Scientific and Technical Information of China (English)

    贺晶; 梁琤

    2011-01-01

    在剖宫产术前可通过病史资料和影像学检查来了解前置胎盘附着位置,而剖宫产术中直视所见虽是最终诊断,但却是滞后的诊断,故其只能作为对术前评估不足的补充.剖宫产术是前置胎盘终止妊娠的主要方式,而选择子宫切口沿着胎盘边缘相比必须"打洞"穿过胎盘组织取胎者的母源性失血和新生儿贫血发生率显著降低.对不同前置胎盘的患者的术式选择应个别对待,根据超声胎盘定位及术中评估等制定个体化手术方案,只要选对子宫的切口,尽量避免胎盘"开窗",可有效减少母儿不良预后.%The history data and imaging of patient before cesarean section can make us understand the placenta position of placenta previa, cesarean section in orthoptic seen, though the final diagnosis, but is lagging behind the diagnosis, it only as to preoperative assessment insufficient added. Cesarean section is the main treatment of placenta previa, and incision choosing along the edge of placenta compares with incision must be "hole" cross the placenta, which will reduce the rate of mother's blood loss and neonatal anemia significantly. Surgical treatment of patients with different placenta previa should be selected, according to preoperative ultrasound placenta positioning and intraoperative assessment to set individualized operation program. If you choose the incision of uterus rightly, avoiding placenta "window", you can effectively reduce mother and neonatal adverse outcomes.

  20. Clinical Analysis of Intravascular Coagulation Application in Pernicious Placenta previa Treatment%介入治疗用于凶险性前置胎盘临床分析

    Institute of Scientific and Technical Information of China (English)

    蔡一铃

    2014-01-01

    Objective To analysis the clinical effect of interventional therapy in pernicious placenta previa treatment. Methods Retrospective analysis of 24892 parturient women clinical data in Chengdu Women’s&Children’s Central Hospital from January 2011 to June 2012. Results The incidence of pernicious placenta previa and placenta increta is lower in those parturient women with delivery gestational age greater than or equal to 37 than those parturient women with delivery gestational age less than 37. The incidence of central type of placenta previa is higher than that of partial placenta praevia and marginal placenta previa (P2000ml、产褥感染、早产、新生儿窒息、新生儿死亡发生率均明显比非介入治疗低(P<0.05)。结论介入治疗用于凶险性前置胎盘的临床效果良好,值得推广。

  1. Ideas previas sobre carga, fuerza y campo eléctrico en estudiantes universitarios. Consideraciones para su superación

    Directory of Open Access Journals (Sweden)

    Marianela Nava

    2008-05-01

    Full Text Available El presente trabajo trata sobre el valor didáctico de las ideas previas de los estudiantes para la construcción de nuevos saberes, que lo posibiliten para dar explicaciones acordes con el conocimiento científico. Luego del análisis de los datos, se plantea el diseño de situaciones didácticas, fundamentadas en Posner et al, Ausubel, Amestoy, Alonso et al, que permitan promover la construcción de conceptos, aplicable a diversos campos. El estudio se encuentra enmarcado en un paradigma cuali-cuantitativo, a nivel descriptivo. Una conclusión importante es que las nociones sobre campo eléctrico, resultaron más deficientes que las de carga, pero menos que las de fuerza eléctrica, siendo necesario fomentar la construcción de conceptos científicos en los estudiantes universitarios.

  2. Analysis of 37 cases of placenta previa risk factors and pregnancy outcome%前置胎盘危险因素及妊娠结局37例研究

    Institute of Scientific and Technical Information of China (English)

    龚俊; 马海燕; 董芳芳

    2013-01-01

    Objective To investigate the risk factors and pregnancy outcome of placenta previa. Methods 39 cases of placenta previa cases in the hospital were retrospectively analyzed,and made the same period 50 cases of normal maternal as control group.Results In placenta previa group,maternal age,maternal time and the number of abortions were higher than control group,the proportion of maternal with history of cesarean section and placenta previa history was also significantly higher(P<0.05 or 0.01),the rate of cesarean section,obstetric complications and neonatal asphyxia rate were higher than that of the control group (P<0.05). Conclusion Variety of factors related to the formation of placenta previa,and placenta previa could lead to adverse pregnancy outcomes.Strengthen prenatal care could reduce the incidence of placenta previa,and also help to reduce the rate of preterm birth,cesarean section rate and neonatal asphyxia.%  目的探讨前置胎盘的危险因素及对妊娠结局的影响.方法对我院收治的37例前置胎盘病例进行回顾性分析,并与同期50例正常产妇作对照.结果研究组孕产妇年龄、孕产次、流产次数均高于对照组,有剖宫产史者和前置胎盘史者所占比例也明显高于对照组(P<0.05或P<0.01),剖宫产率、产科并发症以及新生儿窒息率等均高于对照组(P<0.01).结论前置胎盘的形成与多种因素有关,可导致不良的妊娠结局,加强产前保健可以降低前置胎盘发生率,也有利于降低早产率、剖宫产率以及新生儿窒息率.

  3. Application Value of the Fast Magnetic Resonance Imaging Technique in the Diagnosis of Placenta Previa%MRI快速成像技术在前置胎盘诊断中的应用价值

    Institute of Scientific and Technical Information of China (English)

    王建伟; 王敏; 季丽雅

    2016-01-01

    Objective To evaluate the application value of the fast magnetic resonance imaging technique in the diagnosis of placenta previa.Methods 25 patients diagnosed with placenta previa underwent the single shot fast spin echo (SSFSE) sequence and fast imaging employing steady state acquisition (FIESTA) sequence scanning. The MRI features and clinic appearances of these 25 cases were analyzed.Results One out of the 25 cases was marginal placenta previa, 6 cases were partial placenta previa, 18 cases were complete placenta previa. Nine cases were placenta previa complicated with placenta accrete: 3 out of the 9 cases were placenta adhesion, 5 of 9 were placenta increta, 1 of 9 was placenta penetration. MRI could show the relationship between the placenta and the internal cervical oriifces straightly. The linear low signal intensity of the myometrium was discontinued in the cases complicated with placenta accrete, relatively high signal of the placenta intruded into the myometrium from the discontinued place.Conclusion The fast MRI technique has high clinical application value in the diagnosis of the placenta previa and placenta accrete.%目的:探讨MRI快速成像技术在前置胎盘诊断中的应用价值。方法采用单激发快速自旋回波(SSFSE)序列和快速稳态进动采集(FIESTA)序列,对25例前置胎盘孕妇行MRI扫描,观察和分析前置胎盘的MRI表现。结果25例前置胎盘中,边缘型前置胎盘1例,部分型前置胎盘6例,完全型前置胎盘18例;前置胎盘合并胎盘植入9例,其中胎盘粘连3例,胎盘植入5例,胎盘穿透1例。MRI可直观地显示前置胎盘与子宫颈内口之间的关系,合并有胎盘植入的病例,可见子宫肌层的低信号线影局部中断,相对高信号的胎盘组织由此侵入到肌层。结论 MRI快速成像技术在前置胎盘及胎盘植入的诊断中有较高的临床应用价值。

  4. 辅助生育中子宫内膜异位症与前置胎盘的相关性%The correlation between endometriosis and placenta previa in assisted reproductive technology

    Institute of Scientific and Technical Information of China (English)

    傅秀娟; 周勇; 金杭美

    2015-01-01

    Objective: To investigate placenta previa associated with endometriosis in assisted reproduc-tive technology.Methods: Consecutive 2 060 pregnancies conceived by assisted reproductive technology were recruited between 2008 and 2012 in Women’s Hospital, School of Medicine, Zhejiang University. The risk of pla-centa previa after assisted fertilization was analyzed. Relation of nine variables was examined, i.e. maternal age, BMI, gravidity, parity, previous abortion, previous cesarean delivery, endometriosis, ovulatory disorder, and male infertility, to placenta previa by logistic regression analysis. The correlation between endometriosis severity with placenta previa was analyzed by the nonparametric test of Spearman correlation analysis.Results: In 110 women with placenta previa, there were 69 cases complicated with endometriosis. We found that endometriosis (odds ratio=19.7; 95% CI=0.5-300.6) were signiifcantly associated with placenta previa. Endometriosis was more seri-ous more prone to placenta previa (the Kendall correlation coefifcient is 0.274, Spearman correlation coefifcient is 0.281, allP<0.001).Conclusion: Our ifndings suggest that endometriosis is associated with an increased risk of placenta previa in assisted reproductive technology. The higher degree of endometriosis, the more possible of placenta previa.%目的:探讨在辅助生育中子宫内膜异位症和前置胎盘的相关性。方法:回顾性分析2008年1月至2012年12月在浙江大学附属妇产科医院接受辅助生殖技术病例,根据纳入标准其中胚胎移植成功且并在单胎28周后分娩者有2060例,有110例发生了前置胎盘。回顾病史分析孕妇年龄、体质量指数、孕次、产次、流产次数、剖宫产史、子宫内膜异位症、排卵障碍、男性不孕等9个指标,分析它们与前置胎盘的相关性。同时对子宫内膜异位症分型与前置胎盘的相关性做进一步研究。结果:2060例观察资料中子宫内

  5. The diagnosis and experience of 30 cases of patients with placenta previa postpartum hemorrhage%前置胎盘产后出血3000例临床诊疗体会

    Institute of Scientific and Technical Information of China (English)

    陶红

    2014-01-01

    Objective to investigate the factors and associated treatments for patients with placenta previa placenta previa by exploring the position of postpartum hemorrhage. Methods 3000 patients with placenta previa were selected from april 2008 to January 2013 in our hospital. the effects of different types of placenta previa postpartum hemorrhage patients were analyzed. Results after treatment, three kinds of placenta previa bleeding in patients were small. 766 cases of borderline, 800 cases of some type of central placenta previa and 1234 cases of bleeding in 500 ml or less were 573(74.80%)、679(84.87%) and 600(48.62%)cases relatively. Bleeding and bleeding rates in patients with central placenta previa, placenta previa was significantly higher than the other two patients with a significant difference(P<0.05) and the end of pregnancy in patients with early postpartum hemorrhage was more than the end of pregnancy in patients with late postpartum hemorrhage with significant difference(P<0.05). Conclusion Placenta previa can significantly affect pregnant women with postpartum hemorrhage. If the patients were treanted with the right measures, it can significantly reduce the amount of bleeding and gets good clinical results.%目的:通过探讨前置胎盘患者产后出血的状况影响因素以及治疗方法。方法本次试验以我院2008年4月至2013年1月所收治的3000例前置胎盘患者为研究对象,观察不同的前置胎盘类型对患者产后出血量的影响。结果三种前置胎盘患者中出血量经过治疗均较少,766例边缘型、800例部分型和1234例中央型前置胎盘中出血量在500毫升以下的分别为573(74.80%)例、679(84.87%)例和600(48.62%)例。中央型前置胎盘的患者的出血量和出血率明显高于其他两种前置胎盘患者,差异显著(P<0.05),而结束妊娠早的患者产后出血明显多于结束妊娠晚的患者,差异显著(P<0.05)。结论胎盘前置会显著影响孕妇的产

  6. Clinical analysis of 12 cases placenta previa combined with placenta accreta%前置胎盘合并胎盘植入12例临床分析

    Institute of Scientific and Technical Information of China (English)

    兰景尤; 周雪勤

    2014-01-01

    Objective To investigate the high risk factors,diagnosis and management of placenta previa combined with placenta accreta .Methods The clinical data of 12 cases of placenta previa combined with placenta accrete ( placenta accreta group ) and 82 cases of placenta previa ( placenta previa group ) were analyzed retrospective-ly.Results The age, gravidity, the types of placenta previa and uterine operation history were high risk factors of placenta accreta;The incidences of premature delivery , neonatal asphyxia and postpartum hemorrhage of placenta ac-creta group were higher than those of placenta previa group ( all P<0.05 );The accuracy rate of prenatal color doppler ultrasound in the diagnosis of placenta previa with accreta was 83.3%(10/12).Placenta thickening, the hypoecho of uterine wall muscle layer at the rear of placenta band of being thinning (≤1 mm) or disappeaing , placental parenchy-ma′s rich blood flow , placental cavity gap were characteristic sonogram of placenta previa combined with placenta ac -creta;Expectant treatment and timely termination of pregnancy were the main treatment methods .Conclusion Over 30 years of age ,pregnancy over three times , central type of placenta previa and uterine operation history are high risk factors.Color Doppler ultrasound is currently the most convenient method in diagnosis of placenta accreta .The indi-vidual treatment can improve maternal and neonatal outcomes .%目的:探讨前置胎盘合并胎盘植入的高危因素、诊断及治疗方法。方法对82例前置胎盘(前置胎盘组)和前置胎盘合并胎盘植入12例(胎盘植入组)孕产妇的临床资料进行回顾性分析。结果孕妇的年龄、孕次、前置胎盘类型及子宫手术史是发生胎盘植入的高危因素;胎盘植入组早产、新生儿窒息和产后出血的发生率均高于前置胎盘组( P<0.05);产前彩色多普勒超声诊断前置胎盘合并胎盘植入的正确率为83.3%(10/12),胎

  7. 多种超声方法联合诊断前置胎盘的临床评价%Clinical Evaluation of Combined Diagnosis of Placenta Previa of Various Ultrasound Method

    Institute of Scientific and Technical Information of China (English)

    洪丹

    2014-01-01

    目的:探讨多种超声方法联合诊断前置胎盘的应用价值。方法对拟诊断为前置胎盘的54例患者均先行经腹部超声检查,其中42例出血明显的患者行经会阴超声检查,余患者再行经阴道超声检查。结果临床拟诊前置胎盘54例均先行经腹部超声检查诊断前置胎盘48例,诊断符合率86.1%;有阴道出血史的42例患者再联合经会阴超声检查后诊断前置胎盘40例,诊断符合率95.24%;无阴道出血史的12例患者再联合经阴道超声检查后诊断前置胎盘11例,诊断符合率91.67%。结论经腹部超声有选择的联合经会阴超声或经阴道超声检查能明显提高前置胎盘的诊断率,有较好的临床应用价值。%Objective The application value of combined diagnosis of placenta previa ofvarious ultrasound method. Methods The diagnosis of 54cases of placenta previa underwent transabdominal sonography,including 42 cases of bleeding were underwent transperineal ultrasonography. Results Clinical y diagnosed 54 cases of placenta previa underwent transabdominal ultrasound diagnosis of 48 cases of placenta previa,diagnostic accordance rate was 86.1%;42 patients with waginal bleeding history combined with transperineal ultrasound examination confirmed the diagnosis of 40 casesof placenta previa,diagnosis coincidence rate 95.24%;no combined transvaginal ultrasound diagnosis 11cases of placenta prenia in 12patients with vaginal bleeding history,diagnosis coincidence rate 91.67%. Conclusion Combined with abdominal ultrasound has the choice of transperineal ultrasound and transvaginal ultrasound examination can improve the diagnosis of placenta previa rate,have a good clinlcal value.

  8. 凶险型前置胎盘并发胎盘植入33例临床治疗探讨%Clinical analysis on 33 cases of pernicious placenta previa with placenta accreta

    Institute of Scientific and Technical Information of China (English)

    田宁; 范玲

    2014-01-01

    T he aim is to study the perioperative management .We analyze the clinical complications of pernicious placenta previa complicated with placenta accrete ,taking totally 33 patients of pernicious placenta previa complicated with placenta accrete ,who had admitted to our hospital from January 2009 to December 2013 ,as the samples ,and summarize the clinical complications of the disease and perioperative management . T he results show that the incidence rate of pernicious placenta previa complicated with placenta accreta was 21 .15% .All patients of pernicious placenta previa complicated with placenta accrete were treated by operation ,and the uterus resection rate was 24 .24% (8/33) . T hus the patients of pernicious placenta previa should alert complicated placenta accrete .T he uterus resection rate increases for cases of pernicious placenta previa complicated with placenta accreta ,so they should be given adequate preoperative preparation ,the intraoperative bleeding should combine a variety of methods to control bleeding ,timely hysterectomy was necessary when the treatment was ineffective .%为了分析凶险型前置胎盘并发胎盘植入的临床并发症,探讨其围术期处理,选择首都医科大学附属北京妇产医院2009年1月-2013年12月确诊为凶险型前置胎盘合并胎盘植入的33例病例,研究该疾病的临床并发症和围术期处理.结果显示,凶险型前置胎盘并发胎盘植入发生率为21.15%,所有病例均采用手术终止妊娠,其中子宫切除率为24.24%(8/33).认为凶险型前置胎盘患者应警惕并发胎盘植入,凶险型前置胎盘合并胎盘植入的子宫切除率高,应进行充分的术前准备,术中需要结合多种止血方法控制出血,止血无效者需适时切除子宫.

  9. 凶险型前置胎盘并发胎盘植入的临床分析%Clinical analysis of pernicious placenta previa complicated with placenta accreta

    Institute of Scientific and Technical Information of China (English)

    黄莺; 孙海燕; 隋霜

    2012-01-01

    目的 探讨凶险型前置胎盘并发胎盘植入的高危因素及围产期处理.方法 回顾性分析188例凶险型前置胎盘患者的临床资料.结果 凶险型前置胎盘并发胎盘植入发生率为21.80%(41/188).凶险型前置胎盘并发胎盘植入的高危因素包括:孕妇高龄、流产次数≥2次、剖宫产2次.所有凶险型前置胎盘并发胎盘植入者均采用手术治疗,其中子宫切除率为26.82% (11/41),未并发胎盘植入者子宫切除率为0.96% (8/147),差异有统计学意义(χ2=16.141,P<0.01).结论 对高龄、有多次剖宫产史或多次流产史的凶险型前置胎盘患者应警惕并发胎盘植入,前置胎盘并发胎盘植入的子宫切除率增高.%Objective To investigate the high risk factors and perinatal management of pernicious placenta previa complicated with placenta accreta. Methods The data of 188 cases of patients with pernicious placenta previa was retrospectively analyzed. Results The incidence rate of pernicious placenta previa complicated with placenta accreta was 21. 8% ( 41/188 ), and the high risk factors of it included maternal advanced age, abortion frequency ≥2 and 2 times of cesarean section. All cases of pernicious placenta previa complicated with placenta accreta were treated by operation, and the uterus resection rate was 26. 82% ( 11/41 ). The uterus resection rate of cases without placenta accreta was 0. 96% ( 8/147 ). The difference was statistically significant (X2 = 16. 141, P < 0. 01 ). Conclusion Patients of pernicious placenta previa with advanced age, history of several times of cesarean section and abortion should alert complicated placenta accrete. The uterus resection rate increases for cases of placenta previa complicated with placenta accreta.

  10. 凶险型前置胎盘并胎盘植入的超声诊断价值%The sonographic diagnostic value of pernicious placenta previa and placenta accreta

    Institute of Scientific and Technical Information of China (English)

    马芬; 李燕; 陶溢潮; 陈奕; 田荣华

    2016-01-01

    Objective To evaluate the ultrasonographic features and the ultrasonic value of pernicious placenta previa and placenta accrete, and to improve the prenatal diagnosis rate.Methods Clinical data and imaging features of 22 patients with pernicious placenta previa and placenta accreta were retrospective analyzed.Results Twenty-two cases with placenta previa and placenta implantation were complete placenta previa, 13 cases with placenta previa and implantation were diagnosed by prenatal ultrasound,9 cases with placenta accreta were missed diagnosis,and 2 cases with placenta praevia were misdiagnosis. Conclusion The observation is focused on the essence of placenta,lacenta rear keyed vocal myometrium,bladder with uterine serous hyperechoic and the corresponding blood flow changes combined with a variety of ultrasonic methods,to advance the detection rate of pernicious placenta previa combined with placenta accreta and reduce misdiagnosis.%目的 探讨凶险型前置胎盘并胎盘植入的声像图特征和超声诊断价值,提高产前诊断率.方法 回顾分析我院产后经临床和病理证实的22例凶险型前置胎盘并胎盘植入患者的临床资料及超声表现.结果 22例凶险型前置胎盘并胎盘植入均为完全型前置胎盘,产前超声准确诊断前置胎盘并胎盘植入13例,漏诊胎盘植入9例;误诊前置胎盘类型2例.结论 联合应用多种超声检查方法,重点观察胎盘实质、胎盘后方子宫肌层、子宫膀胱浆膜强回声带及相应血流变化,可以提高凶险型前置胎盘并胎盘植入的检出,减少误漏诊的发生.

  11. Effects on pregnancy outcome of complete and partial placenta previapatients with placenta previa%完全性和部分性前置胎盘对产妇妊娠结局的影响

    Institute of Scientific and Technical Information of China (English)

    周紫琼

    2015-01-01

    Objective To explore effects of complete and partial placenta previapatients with placenta previa on pregnancy outcome. Methods Selected 200 cases of pregnant women with placenta previa,there were 100 cases in each group,after production,compared two groups of maternal condition,mode of production and neonatal status. Results The proportion of antepartum hemorrhage, postpartum hemorrhage,prenatal and puerperal blood transfusion and hemorrhagic shock and other adverse symptoms of complete placenta previa group were higher than partial placenta previa group.plane section was higher,the risk of asphyxia death of complete placenta previa group newborn infantswas more,they have significant differences (P < 0.05). Conclusion Pregnant women with placenta previa type has important influence on theoutcome of pregnancy,compared partial placenta previa pregnant women,clinical symptoms of complete placenta previa pregnant women is more obvious,prognosis is poorer, in an actual treatment,should strengthen thecomplete clinical intervention in pregnant women with placenta praevia.%目的:探求比较完全性和部分性两种前置胎盘类型对产妇妊娠结局的影响。方法回顾性分析2011年1月~2013年1月于我院生产的前置胎盘孕妇200名作为研究对象,其中完全性和部分性前置胎盘孕妇各100例,待孕妇生产后,比较两组产妇生产后母体情况、生产方式以及新生婴儿状况。结果完全性前置胎盘产妇在产前出血、产后出血、产前产后输血以及失血性休克等不良症状比例均高于部分性前置胎盘组,产妇选择剖宫产生产方式比例更高,完全性前置胎盘组新生婴儿出现窒息、死亡的潜在风险更大,差异有统计学意义(P <0.05)。结论孕妇的前置胎盘类型对妊娠结局有着重要的影响,较部分性胎盘前置孕妇,完全性胎盘前置孕妇的临床症状表现更为明显,预后也更差,在实际治疗中,应加

  12. 瘢痕子宫再次妊娠前置胎盘危险程度分析%Analysis on the Placenta Previa Danger Degree of Subsequent Pregnancy with Scar Uterus

    Institute of Scientific and Technical Information of China (English)

    姜百灵; 张方芳

    2013-01-01

    Objective:To study and analyze the placenta previa danger degree of subsequent pregnancy with scar uterus. Methods:160 subsequent pregnancy with scar uterus in our hospital from October 2009 to August 2012 were selected as observation group,and 160 women with primary cesarean section at the same time were selected as control group,then the placenta previa rate of different types and total rate,postpartum adverse situation rate and postpartum hemorrhage of two groups were analyzed and compared,and the postpartum adverse situation rate of observation group with and without placenta previa were compared.Results:The placenta previa rate of different types and total rate,postpartum adverse situation rate of observation group were higher than those of control group,postpartum hemorrhage was more than that of control group,while the postpartum adverse situation rate of observation group with placenta previa was higher than that without placenta previa,postpartum hemorrhage was more than that without placenta previa,all P<0.05,there were all significant differences.Conclusion:The placenta previa rate of subsequent pregnancy with scar uterus is higher,and the proportion of postpartum adverse situation is higher too.%目的:探讨分析瘢痕子宫再次妊娠前置胎盘的危险程度。方法:选取2009年10月~2012年8月本院的160例瘢痕子宫再次妊娠产妇为观察组,同期的160例初次剖宫产产妇为对照组,然后将两组产妇的不同类型及总的前置胎盘发生率、产后不良情况发生率、产后出血量进行统计及比较,然后将观察组中存在前置胎盘与不存在前置胎盘者的产后不良情况发生率及产后出血量进行比较。结果:观察组的不同类型及总的前置胎盘发生率、产后不良情况发生率高于对照组,产后出血量大于对照组,而观察组中存在前置胎盘者的产后不良情况发生率高于不存在前置胎盘者,产后出血量大于不存在前置胎

  13. A retrospective analysis on the pernicious placenta previa from 2008 to 2014%2008-2014年凶险性前置胎盘的回顾性临床研究

    Institute of Scientific and Technical Information of China (English)

    余琳; 胡可佳; 杨慧霞

    2016-01-01

    Objective To investigate the incidence changes, clinical characteristics and pregnant outcomes of pernicious placenta previa. Methods A retrospective cohort analysis on 316 cases with placenta previa in the Peking University First Hospital from January 2008 to December 2014. The research group were 60 cases with the patients of placenta previa with the history of cesarean section, and the control group were placenta previa without the history of cesarean section. Compared with the incidence, intraoperative blood loss, the pregnancy outcomes and so on. Results (1) The average incidence rate of placenta previa during the past 7 years was 10.96‰ (316/28 837). And the cases of pernicious placenta previa was 60 (2.08‰, 60/28 837), the incidence of pernicious placenta previa was rising from 2008 to 2014 (0.91‰-3.08‰). (2) There were 145 cases of placenta privia had been translation from other hospitals in the past 7 years. The referral rate of pregnant women with placenta previa was 45.9%(145/316), and the referral rate of pernicious placenta previa (63.3%, 38/60) was significantly higher than that of non-pernicious placenta previa group (41.8%, 107/256; χ2=9.080, P=0.003). Referral the outcomes of these patients were good, and no maternal death occurred. (3) The placenta in the research group were mainly adhered in the front wall of the uterine, and the incidence was 38.5%(15/39), higher than that in the group of non-pernicious placenta previa (12.1%, 21/174; χ2=57.636, P<0.01). The incidence rate of complicated placenta increased in research group was 53.3% (32/60), higher than that in the group of non-pernicious placenta previa, compared with the control group, there was significant difference (15.6%, 40/256; χ2=39.041, P<0.01). (4) The incidence of blood loss was more than 1 000 ml, blood transfusion rate, the rate of hysterectomy and the rate of asphyxia of newborn in the research group were respectively 41.7% (25/60), 38.3%(23/60), 8.3%(5/60), 15

  14. Clinical analysis of 120 cases of pernicious placenta previa with and without placenta accrete%植入性与非植入性凶险型前置胎盘120例临床分析

    Institute of Scientific and Technical Information of China (English)

    林莉; 郭晓辉; 胡芷洋

    2013-01-01

    目的 分析植入性凶险型前置胎盘对孕产妇的危害性,提高对植入性凶险型前置胎盘的认识和重视.方法 对25例植入性凶险型前置胎盘与95例非植入性前置胎盘的病例进行对比分析.结果 中央性前置胎盘合并植入者达43.8%,植入组产后出血率、产后出血量及子宫切除率与非植入组对比有显著性差异(P<0.01).结论 凶险型前置胎盘孕妇产前应明确有无胎盘植入,应做好术中及术后出血的抢救措施,以保证孕产妇生命安全.%Objective To analysis the complications of pernicious placenta previa with placenta accreta. Methods Retrospective analysis of pernicious placenta cases of previa with and without placenta accreta was performed. Results A total of 43. 8% total pernicious placenta previa cases were complicated with placenta accreta. Compared with non - accreta group, the accreta group had higher chance of postpartum hemorrhage, and risk of hysterectomy (P < 0.01). Conclusion The risk of placenta accreta should be considered in prenatal care for cases with pernicious placenta previa, and prophylaxic management is recommended to prevent hemorrhage.

  15. Diagnosis and treatment strategy for placenta previa and placenta accreta%前置胎盘并胎盘植入诊断和处理策略

    Institute of Scientific and Technical Information of China (English)

    杨延冬; 杨慧霞

    2011-01-01

    Placenta previa associated with placenta abnormally firm attachment may cause obstetrical massive hemorrhage resulting in peripartum hysterectomy and maternal mortality. The standardized management strategy includes early accurate diagnosis,reasonably expected therapy, timely termination of pregnancy, emphasis on perioperative management,appropriate management of postpartum hemorrhage,trying to conservative treatment, and timely hysterectomy, to reduce maternal morbidity and mortality and improve maternal and perinatal outcomes by multidisciplinary corporation.%前置胎盘并胎盘植入常常导致产前尤其产时、产后不可预见且不易控制的大出血,大大增加了产科子宫切除的几率,严重威胁孕、产妇生命.多学科合作提高前置胎盘并胎盘植入的产前诊断率,合理期待治疗、适时终止妊娠;同时,重视围术期处理、做好防治产后出血的准备,尽量保守治疗、适时子宫切除,以降低孕、产妇并发症和死亡率,改善围生儿结局和产妇生活质量.

  16. 前置胎盘和胎盘前置状态的MRI诊断价值%Value of MRI in the diagnosis of placenta previa

    Institute of Scientific and Technical Information of China (English)

    姚庆东; 许崇永; 王小蓉; 王营营; 张硅; 方必东

    2014-01-01

    Objective:To assess the value of MRI in the diagnosis of placenta previa as well as accompanying placenta accreta.Methods:The clinical and imaging materials of 25 pregnant patients with placenta previa were included in this stud-y,the age ranged from 21~43y (mean,29.4±6.2y),the gestational age of the fetuses at the time of MRI ranged from 21~38w (mean,32.9±4.0w).All patients underwent MR and ultrasonography (US)before delivery.Taking pathology and the final clinical diagnosis during delivery as gold standard,the value of these two imaging modalities were compared and ana-lyzed.Results:Among the 25 pregnant women with placenta previa,there were central complete type (19 cases),partial type (3 cases)and marginal type (3 cases).MRI and US correctly diagnosed 20 cases and 18 cases respectively,with no signifi-cant statistic difference (P>0.05).The sensitivity and specificity of MRI and US for accompanying placenta accreta was 71.4%,66.7% and 72.7%,69.2%,respectively;the negative predictive value (NPV)and positive predictive value (PPV) was 76.9%,66.7% and 66.7%,69.2%,respectively.On MRI,the placenta accreta demonstrated partial loss of deciduum, focal thinness or absence of myometrium,nodular interface between placenta and uterus,heterogeneous signal intensities within placenta,bands of hypo-intensities within placenta on T2 WI,loss or diminish of the inter-space between placenta and bladder.Conclusion:MRI and US play an important role in the diagnosis of placenta previa and accompanying placenta accre-ta,they are complementary.%目的:探讨 MRI对前置胎盘和胎盘前置状态及伴发的胎盘植入的诊断价值。方法:搜集本院25例前置胎盘和胎盘前置状态孕妇的临床及影像学资料,年龄21~43岁,平均(29.4±6.2)岁,孕龄21~38周,平均(32.9±4.0)周,25例均行产前 MRI及超声(US)检查,以病理或分娩时临床诊断为金标准,对比分析两种检查的诊断价值。结果:25例

  17. Personalized treatment expectations of central placenta previa%中央性前置胎盘个体化期待治疗

    Institute of Scientific and Technical Information of China (English)

    陈素华

    2011-01-01

    The massive hemorrhage of central placenta previa could lead to gravida hemorrhagic shock,dead or iatrogenic premature delivery. On the premise of gravida safety, the expectant treatment of inhibiting uterine contraction, promoting fetal lung maturation, cervical cerclage, preventing infection and supporting therapy should be carried out according to the different clinical character of individual case. The implementation of these treatments will help to prolong delivery gestational weeks and improve perinatal prognosis.%中央性前置胎盘大出血可导致孕妇失血性休克、死亡以及治疗性早产.在保证孕妇健康安全的前提下,针对每个病例的临床特点,给予抑制宫缩、促胎肺成熟、宫颈环扎、预防感染、支持治疗等个体化期待治疗,延长分娩孕周,有助于改善围产儿预后.

  18. Características estructurales del sector sur de la faja plegada y corrida de Malargüe (35°-36°S: distribución del acortamiento e influencia de estructuras previas

    Directory of Open Access Journals (Sweden)

    Laura Giambiagi

    2009-10-01

    Full Text Available En el presente trabajo se analizan los mecanismos de deformación de estructuras de piel gruesa en el sector sur de la faja plegada y corrida Malargüe, entre los 35º y 36º S. A partir de la confección de 15 secciones estructurales balanceadas seriadas de 75 km de longitud y su comparación, se pudo analizar la compleja interacción espacial entre la deformación de la cobertura sedimentaria de edad triásica tardía a cenozoica y el basamento estructural, compuesto principalmente por rocas metamórficas e ígneas paleozoicas. Dicho análisis permitió estudiar el grado de influencia de estructuras previas en la deformación, así como la relación entre las estructuras de basamento de bajo y alto ángulo, los mecanismos de deformación y el porcentaje de acortamiento. Dentro de los controles sobre los mecanismos de interacción entre estructuras de piel fina y de piel gruesa se concluye que fueron tres los principales: (1 las variaciones reológicas y de espesores de la cobertura mesozoica, (2 la velocidad de deformación, y (3 la presencia de estructuras previas. Dentro del primer control se observó que las fuertes anisotropías mecánicas dentro de la estratigrafía de la cobertura mesozoica, junto al importante espesor de esta cobertura, favorecieron mecanismos de tipo pliegues por flexión de falla con muy alta relación p/s. Por el contrario, una baja velocidad de deformación favorecería un plegamiento con cizalla triangular y baja relación p/s. Dentro del control de estructuras previas, éstas pueden haber ejercido dos tipos contrapuestos de controles. La presencia de estructuras previas favorece altos valores de p/s y mecanismos de tipo plegamiento por flexión de falla; mientras que geometrías de fallas previas de tipo lístrico tienden a ejercer un control inverso, es decir bajos valores de p/s, debido a la dificultad de reactivar el sector superior de alto ángulo.

  19. Clinical analysis of 17 cases of placenta previa with placenta accreta%前置胎盘合并胎盘植入17例临床分析

    Institute of Scientific and Technical Information of China (English)

    游一平; 雷莹娟

    2005-01-01

    目的探讨前置胎盘合并胎盘植入的高危因素及处理方法.方法回顾性分析我院2000年1月~2004年11月住院治疗的139例前置胎盘,其中合并胎盘植入17例.结果前置胎盘合并胎盘植入发生率12.23%;很少发生产前出血的中央型前置胎盘多有胎盘植入;胎盘植入组即使产前出血,其次数及出血量较无胎盘植入者低.结论对不发生或极少发生产前出血,有多次孕产史的中央型前置胎盘,要考虑胎盘植入.浆膜面全肌层缝扎止血法可成功保留子宫,值得推广应用.%[Objective] To explore the high risk factors and management of placenta previa complicated with placenta accreta. [Method] Retrospectively analyzed all the 139 cases of placenta previa hospitalized in the hospital from 2000 January to 2004 November, of which 17 cases complicated with placenta accreta. [Result] The incidence rate of placenta previa with placenta aacreta was 12.23%; the patient with central placenta previa who seldom occurred antepartum hemorrhage was complicated with placenta accreta; and even if antepartum hemorrhage happened in the group of placenta accreta, the times and quantity of henorrhage were lower than non-placenta accreta group. [Conclusion] When there is no or little hemorrhage during third trimester in patients with central placenta previa and many parities, placenta accreta must be considered. Transfixion hemostasis of all muscular layer through serous membrane can reserve uterus successfully and it is worth generalizing.

  20. Relationship of lowly gestation sac and placenta previa in early pregnancy by ultrasonic diagnosis%超声诊断早期妊娠妊囊位置低下与前置胎盘的关系

    Institute of Scientific and Technical Information of China (English)

    高晓凤

    2013-01-01

    Objective To analyze the relationship of lowly gestation sac and placenta previa through ultrasonic diagnosis of location of gestation sac and if whether is or isn't placenta previa in early pregnancy of 1000 pregnant women, and deal with as soon as possible. Methods The location of gestation sac and if whether is or isn't placenta previa in early pregnancy of 1000 pregnant women collected in our hospital from May 2010 to November 2012 were ultrasonic detected. Results The patients with lowly gestation sac in early pregnancy were 216, and the patients with placenta previa were 78, of all 45 cases with lowly gestation sac combined with placenta previa. The incidence of the patients diagnosed lowly gestation sac in early pregnancy by ultrasonic inspection with placenta previa was higher. Conclusion The possibility of placenta previa is suggested if lowly gestation sac in early pregnancy was fined. So, the decision of prevent miscarriage or termination of pregnancy should be made. Lowly gestation sac in early pregnancy can provide important value for clinical treatment.%  目的通过超声诊断1000例孕妇早期妊娠妊囊的位置以及查看胎盘是否前置,以此进行分析妊囊位置低下和前置胎盘的关系,以便尽快做出各种处理方案。方法收集2010年5月~2012年11月前来我院就诊的1000名孕妇经超声观察孕妇早期妊娠妊囊位置情况,以及孕妇是否发生前置胎盘。结果早期妊娠妊囊位置低下的有216例,此外发生前置胎盘的有78例,其中妊囊位置低下且发生前置胎盘的孕妇共有45例,超声诊断孕妇早期妊娠妊囊位置低下,发生前置胎盘的几率较大。结论发现孕妇早期妊娠妊囊位置低下时,提示前置胎盘的可能性,因而应尽快做出保胎或者终止妊娠的决策,早期妊娠妊囊位置低下为临床治疗提供重要价值。

  1. Risk Factors of Placenta Previa and Its Effects On Pregnancy Outcome%前置胎盘的危险因素分析及其对母儿转归的影响

    Institute of Scientific and Technical Information of China (English)

    屈兰芹

    2012-01-01

      目的:探讨前置胎盘发生的危险因素及其对母儿转归的影响.方法:对本院产科收治的70例前置胎盘患者(研究组)和同期收治的60例健康孕产妇(对照组)的临床资料进行分析,分析前置胎盘发生的危险因素及其对母儿转归的影响.结果:两组患者年龄、子宫畸形史、流产次数、分娩史、剖宫产史、盆腔炎史间比较,差异具有统计学意义(P<0.05).Logistic 回归分析发现高龄(OR=3.301)、多次流产史(OR=6.614)、子宫畸形史(OR=6.172)及剖宫史(OR=4.549)的患者出现前置胎盘的危险性相对较高.研究组与对照组在母儿转归中,胎盘粘连、胎盘植入、剖宫产、产后出血、出生体重、1 min Apgar 评分、新生儿窒息比较,差异有统计学意义(P<0.05).结论:年龄、子宫畸形史、流产次数、剖宫产史是前置胎盘发生的高危因素,应从源头控制前置胎盘的发生,有针对性地降低孕前置胎盘危险因素的暴露率.%  Objective :To investigate the high risk factors of placenta previa and its effects on pregnancy outcome.Method :70 pregnant and parturient women with placenta previa were chosen as study group and 60 pregnant and parturient women without placenta previa were chosen as the control group. Result :There were significant differences in age,abortion,with history of uterine malformation,childbearing,cesareau section and pelvic inflammatory between the two groups(P<0.05).Factors significantly associated with development of placenta previa were old age(OR=3.301), abortions(OR=6.614),history of uterine malformation(OR=6.172)and cesarean section(OR=4.549). There were significant differences in placenta accret,cesarean section,postpartum hemorhage,birth weight,first minute Apgar scores,neonatal asphyxia between the two groups(P<0.05). Conclusion :The high risk factors for placenta previa were old age,abortions,history of uterine malformation and cesarean section. It

  2. Value of prenatal diagnosis of pernicious placenta previa with placenta accreta%胎盘植入合并凶险型前置胎盘的产前诊断及意义

    Institute of Scientific and Technical Information of China (English)

    陈旭日

    2015-01-01

    Objective To investigate the prenatal diagnosis of pernicious placenta previa with placenta increta. Methods Collecting the patients were treated in our hospital from June 2005 to October 2014 , 16 cases were placenta implantation and placenta previa, 34 cases were placenta implantation without placenta previa and 78 cases were placenta previa complicated with placenta accreta, a total of 128 cases of patients as the research object. Prenatal ultrasound diagnosis rate and ultrasonography characteristics were retrospective analized. Results The detection rate of placenta implantation of the combined group was significantly higher than combined group placenta previa (P<0.05); Detection rate with the dangerous type of placenta were higher than the common group significantly (P<0.01). In placenta previa, ratio of patients with an age of more than 35 years the proportion with placenta implantation and uterine cavity operation with more than 2 times compared with placent a accreta patients, the difference was statistically significant (P<0.01). Conclusion Prenatal ultrasound diagnosis of placenta previa complicated with placenta accrete has a positive meaning to decrease the mother and fetal death risk.%目的:探讨胎盘植入合并凶险型前置胎盘的产前诊断及其意义。方法选取2005年6月至2014年10月我院收治的16例胎盘植入合并凶险型前置胎盘、34例胎盘植入未合并凶险型前置胎盘以及78例凶险型前置胎盘未合并胎盘植入,总计128例患者作为研究对象,回顾性分析产前超声检查诊断检出率以及超声检查特点。结果合并前置胎盘组胎盘植入检出率明显高于未合并组,差异具有统计学意义(P<0.05);合并凶险型胎盘检出率较合并普通型组检出率高,差异具有统计学意义(P<0.01)。在凶险型前置胎盘中,合并胎盘植入的患者年龄≥35岁比例以及宫腔操作次数≥2次的比例较未合并胎盘植入患者高

  3. Catalytic Spectrophotometric Determination of Trace Vanadium Based on Oxidation of Arsenazo Ⅲ with Bichromate by Using Triton X-100 to Enhance Its Effect%重铬酸钾氧化偶氮胂Ⅲ动力学光度法测定痕量硒

    Institute of Scientific and Technical Information of China (English)

    周之荣; 周瑜芬; 李桂艳

    2007-01-01

    A catalytic spectrophotometry for the determination of trace vanadium(Ⅴ) based on its catalytic effect on discoloring reaction of oxidation of arsenazo Ⅲ (AsA Ⅲ) with potassium bichromate in a weak acid medium is described, and the addition of Triton X- 100 can further increase the sensitivity of the reaction and its catalytic extent is linear with the content of V(Ⅴ). The reaction rate is monitored spectrophotometrically by measuring the decrease in absorbance of AsA Ⅲ at 550 nm after a fixed time (8 min). The calibration graph is linear in the range of 0.0~20.0μg/L vanadium (Ⅴ) and the detection limit of the method is 0.15μg/L. Combined with ion-exchange resin separation. The method has been successfully applied to the determination of V(Ⅴ)in food samples with the relative standard deviation of 1.18%~4.00% and the recovery of 97.5%~ 102.5%. The results are in good agreement with those provided by AAS method. The method has also been applied to the determination of V(Ⅴ) in human hair, plant and tea samples, and the results are in agreement with certified values.%基于稀HCl介质中,在非离子表面活性剂Triton X-100存在时,痕量钒(Ⅴ)催化重铬酸钾氧化偶氮胂Ⅲ的褪色反应,建立了测定痕量钒(Ⅴ)的催化动力学光度法.方法检出限为0.15μg/L,线性范围为0.0~20.0μg/L.结合离子交换树脂分离,实现了食品中痕量钒(Ⅴ)的测定,加标回收率为97.5%~102.5%,样品测定的相对标准偏差(RSD)为1.18%~4.00%.用于测定人发、植物、茶叶样品中的痕量钒(Ⅴ),结果满意.

  4. Clinical Analysis of 80 Cases of Central Placenta Previa With Placenta Implantation%中央性前置胎盘并发胎盘植入80例临床研究

    Institute of Scientific and Technical Information of China (English)

    赵丽娟

    2016-01-01

    Objective To study the central placenta previa complicated with placenta implantation of risk factors and treatment methods,to provide basis for clinical. Methods Selection in December 2016 to February 2013 hospital make a diagnosis and give treatment of 80 cases of patients with central placenta previa complicated with placenta implanted materials were analyzed,and the set as experimental group,select during the same period of 145 cases of hospitalized patients with central placenta previa as the control group,analysis of risk factors central placenta previa and two groups of cases in the perinatal period. Results Incidence of central placenta previa complicated with placenta implantation trial with age,pregnant women abortion is close to times and the history of cesarean section(P<0.05). Group the bleeding in the perinatal period is higher than the control group(P<0.05). Patients without bleeding patients less than control group(P < 0.05). Conclusion The risk factors of central placenta previa more,should make ful preoperative preparation,formulate reasonable operation scheme,reduce the bleeding in the perinatal period.%目的:研究中央性前置胎盘并发胎盘植入的高危因素及处理方法,为临床提供依据。方法选取2013年12月~2016年2月医院诊治的80例中央性前置胎盘并发胎盘植入患者资料进行分析,设为试验组,选取同期入院的145例中央性前置胎盘患者为对照组,分析中央性前置胎盘的高危因素及两组围生期情况。结果试验组中央性前置胎盘并发胎盘植入发病率与孕妇年龄、流产次数及剖宫产史关系密切(P<0.05);试验组围生期出血量高于对照组(P<0.05);试验组无出血患者少于对照组(P<0.05)。结论中央性前置胎盘的高危因素相对较多,术前应做好充分的准备,制定合理的手术方案,降低围生期出血量。

  5. 160例前置胎盘与产后出血相关因素调查分析%160 Cases of Placenta Previa and Postpartum Hemorrhage Correlation Fac-tor Analysis

    Institute of Scientific and Technical Information of China (English)

    刘艳

    2015-01-01

    Objective To analyze the related factors of postpartum hemorrhage in patients with placenta previa, provides the sci-ence for clinical treatment. Methods 160 patients with placenta previa, according to whether the postpartum hemorrhage were di-vided into the control group of 116 cases, the observation group of 44 cases. Results The patients in the observation group were significantly higher than the control group, the difference was statistically significant(P<0.05);the observation group maternal time is more than 2 times, a history of uterine surgery, preterm labor patients were significantly higher than the control group, the dif-ference was statistically significant(P<0.05);constituent ratio of different patients in the observation group and the control group of patients with placenta previa types, the difference was statistically significant (P<0.05);multiple factor analysis showed that age, parity and uterine surgery history and preterm labor patients more prone to postpartum hemorrhage, and marginal placenta previa, partial and complete placenta previa postpartum hemorrhage is more likely to appear. Postpartum hemorrhage is associated with many factors. Conclusion Patients with placenta previa, comprehensive consideration should be the treatment process.%目的:分析前置胎盘患者发生产后出血的相关因素,为临床治疗提供科学。方法160前置胎盘患者,按照是否出现产后出血分为对照组116例,观察组44例。结果单因素分析显示:观察组患者年龄明显高于对照组,差异有统计学意义(P<0.05);观察组孕产次≥2次、有子宫手术史、早产患者比例明显高于对照组,差异有统计学意义(P<0.05);观察组患者与对照组患者前置胎盘类型构成比不同,差异有统计学意义(P<0.05);多因素分析结果显示:年龄高、产次多、有子宫手术史及早产患者更容易出现产后出血,同时与边缘性前置胎盘比较,部分性和完全性

  6. 剖宫产至凶险型前置胎盘的临床治疗分析%Analysis of Clinical Treatment of Pernicious Placenta Previa Caused by Caesarean Section

    Institute of Scientific and Technical Information of China (English)

    裴英桂

    2016-01-01

    Objective To discuss the treatment effect of pregnant women with pernicious placenta previa caused by caesare-an section by sorting out the clinical treatment data of them. Methods 48 cases of pregnant women with pernicious placenta previa caused by caesarean section admitted and treated in our hospital from January 2014 to January 2015 were selected as the research group, 48 cases of pregnant women with common placenta previa were selected as the control group, and the postpartum hemorrhage volumes and hysterectomy rates were compared between the two groups. Results The difference in the morbidity of adherent placenta between the research group and the control group was obvious with statistical signifi-cance, (60.41%vs 33.33%), P<0.05. Conclusion The morbidity of pernicious placenta previa caused by caesarean section is lower, and the postoperative hemorrhage volume of it is obviously higher than that of common placenta previa, and we had better treat the pregnant women with pernicious placenta previa caused by caesarean section by total hysterectomy in order to ensure the life safety of them.%目的:整理该院剖宫产至凶险型前置胎盘孕产妇的临床治疗资料,探讨剖宫产至凶险型前置胎盘孕产妇的治疗效果。方法整群选取该院2014年1月—2015年1月收治的48例剖宫产至凶险型前置胎盘孕产妇,将其作为研究组,另选48例普通前置胎盘孕产妇作为对照组,比较两组孕产妇的产后出血量以及子宫切除率。结果研究组孕产妇出现胎盘粘连率为60.41%,对比组孕产妇出现胎盘粘连率为33.33%,两组患者的胎盘粘连发病率差异有统计学意义(P<0.05)。结论剖宫产至凶险型前置胎盘的发病率较低,在术后出血量上明显的高于普通前置胎盘,对出现凶险型前置胎盘的孕产妇宜进行子宫全切治疗,以保证孕产妇的生命安全。

  7. Risk factors of placenta previa and its effects on pregnancy%前置胎盘的高危因素及其对妊娠结局的影响分析

    Institute of Scientific and Technical Information of China (English)

    钟春华; 黎笑容; 袁秀英; 林小琦; 陈武娟; 钟玲

    2014-01-01

    目的 探讨前置胎盘的高危因素及其对妊娠结局的影响.方法 对2008年3月至2013年3月在我院产科住院分娩的240例前置胎盘产妇和同期我院未患有前置胎盘的240例产妇进行病例对照分析.结果 病例组和对照组在年龄、文化水平、吸烟状况、分娩史、剖宫产史以及流产史上的分布有统计学差异(P<0.01).logistic回归结果显示高龄、吸烟、分娩史、剖宫产史以及流产史是前置胎盘发病的高危因素(P<0.01).前置胎盘在胎盘粘连、植入、早产、产后出血、新生儿窒息和围生儿死亡等妊娠结局指标上分布有统计学差异(P<0.05).结论 高龄、吸烟、分娩史、剖宫产史以及流产史的孕妇前置胎盘发病率高;前置胎盘易导致产妇胎盘粘连、胎盘植入、产后大出血、早产以及新生儿窒息.%Objective To explore the risk factors of placenta previa and its effects on pregnancy.Methods We preformed the case-control study basing on the data of 240 maternal with placenta previa and 240 maternal without placenta previa in our hospital from March 2008 to March 2013.Results Among two groups,distributions of age,education level,smoking status,history of childbirth,cesarean section and abortion were statistically significantly different (P < 0.01).The results of the logistic regression analysis showed high age,smoking habit and history of childbirth,cesarean section and abortion were risk factors for placenta previa.Meanwhile,distributions of maternal placenta accreta,placenta accreta,postpartum hemorrhage,premature birth and neonatal asphyxia were statistically significantly different among two groups (P < 0.05).Conclusions Pregnant women with high age,smoking habit and history of childbirth,cesarean section and abortion have a high risk of placenta previa; placenta previa can lead to maternal placenta accreta,placenta accreta,postpartum hemorrhage,premature birth and neonatal asphyxia.

  8. 中央性前置胎盘并发胎盘植入22例临床分析%Clinical analysis of 22 cases of complete placenta previa with placenta increta

    Institute of Scientific and Technical Information of China (English)

    颜秋霞; 郭晓燕; 雷慧中; 温穗文

    2013-01-01

    目的:探讨中央性前置胎盘并发胎盘植入的高危因素及处理方法。方法:回顾性分析2010年1月-2013年6月广东省清远市人民医院产科收治的95例中央性前置胎盘患者(其中22例并发胎盘植入)的临床资料。结果:我院近4年来中央性前置胎盘的发生率为0.8%(95/12261),中央性前置胎盘并发胎盘植入的发生率为23.2%(22/95);中央性前置胎盘并发胎盘植入的高危因素包括:孕妇年龄≥35岁、有剖宫产史;中央性前置胎盘并发胎盘植入者产时产后出血量明显多于未并发胎盘植入者(P=0.000)。结论:对高龄的、有剖宫产史的中央性前置胎盘患者应警惕并发胎盘植入;为减少中央性前置胎盘并发胎盘植入因严重的产时产后出血对母儿造成的危害,强调术前预测和诊断,制定手术方案,做好术前的充分准备。%Objective:To discuss the high risk factors and peripartum management of complete placenta previa complicated with placenta increta. Methods:The 95 cases of complete placenta previa hospitalized in The People's Hospital of Qingyuan from January 2010 to June 2013 were analyzed retrospectively which 22 cases complicated with placenta increta. Results:The incidence of complete placenta previa was 0.8%(95/12261) in recent 3.5 years, and the morbidity of placenta increta among women with complete placenta previa was 23.2%(22/95);The high risk factors of complete placenta previa with placenta increta included more than 35 years old, previous cesarean delivery; The amount of postpartum hemorrhage in placenta increta group was significantly higher than that in non-placenta increta group. Conclusions:Placenta increta must be considered if the pregnant woman with complete placenta previa complicated with previous cesarean delivery or if she was more than 35 years old;To reduce the side effect to mother and fetus because of serious puerperal hemorrhage, peripartum clinical

  9. 中央性前置胎盘并发胎盘植入102例临床观察%Clinical observation of 102 cases of central placenta previa placenta accrete

    Institute of Scientific and Technical Information of China (English)

    胥琳璟; 鲁顺琼; 赖思强; 张月桃

    2016-01-01

    Objective To observe the central placenta previa placenta into the risk factors,and explore its treatment meth-od.Method 270 cases were retrospectively analyzed of clinical data central placenta previa patients,including 102 cases of patients with central placenta previa placental implantation,which as the observation group,the rest of the 168 cases of patients with pre -central placenta as a control group,the risk factors of central placenta previa placenta implantation were observed perinatal situation two groups of patients.Results Central placenta previa combined with placenta into risk factors include age factor (age ≥35 years),fertility factors (maternal),cesarean factors (had a history of cesarean section)as well as factors of postpartum hemorrhage (postpartum bleeding ≥800 ml),etc.Conclusion For senior citizens,history of cesarean section and placenta previa central post-partum hemorrhage in patients with a history of excessive concurrency to be highly vigilant placenta accreta,assessment before sur-gery,to reduce the harm to the mother and child.%目的:观察中央性前置胎盘并发胎盘植入的危险因素和临床情况。方法:选取收治的270例中央性前置胎盘患者的临床资料进行回顾性分析,其中有102例中央性前置胎盘患者并发胎盘植入,将其作为观察组,其余的168例中央性前置胎盘患者作为对照组,分析中央性前置胎盘并发胎盘植入的危险因素,观察两组患者的围生期情况。结果:中央性前置胎盘并发胎盘植入的危险因素包括年龄因素(年龄≥35岁)、生育情况因素(经产妇)、剖宫产史因素(有过剖宫产史)以及产后出血量因素(产后出血量≥800 ml)等。结论:对于高龄、有剖宫产史以及有产后出血过多史的中央性前置胎盘患者要高度警惕其并发胎盘植入,做手术前的评估,降低对母婴的危害。

  10. 前置胎盘合并胎盘植入的产前彩色多普勒超声诊断价值%Diagnostic Value of placenta previa complicated with placenta increta by prenatal Color Doppler sonography

    Institute of Scientific and Technical Information of China (English)

    韩新洪; 解左平; 邱合荣

    2011-01-01

    Objective: To approach sonographic feature and the prenatal diagnostic value of placenta previa complicated with placenta increta. Methods: 289 cases with placenta previa underwent rout prenatal sonography to observe the sate of placenta increta. Results: 14 cases with placenta increta were detected by sonography, 12 cases were confirmed by clinic and pathology. The diagnose accordance rate was 85.7% (12/14). 5 cases were missed diagnosed, 2 cases were misdiagnosed. Conclusion: With the typical sonographic feature, prenatal sonography of placenta previa complicated with placenta increta help to the clinic diagnosis and handle.%目的 探讨前置胎盘合并胎盘植入的产前彩色多普勒超声的声像图特点及诊断价值.方法 对289例前置胎盘患者行常规产前超声检查,重点观察胎盘植入情况.结果 超声诊断胎盘植入14例,产后经临床及病理确诊12例,诊断符合率85.7%(12/14).5例漏诊,2例误诊.结论 前置胎盘合并胎盘植入的彩色多普勒超声具有较典型声像图特点,产前超声检查能为临床诊断及处理提供帮助.

  11. Clinical analysis and nursing on placenta previa (Attached 50 cases report)%前置胎盘临床分析及护理(附50例报告)

    Institute of Scientific and Technical Information of China (English)

    于雪梅

    2014-01-01

    To increase nursing quality and ensure safety of puerpera and neonate using analysis on the cause of placenta previa and best management method. Methods:50 patients with placenta previa were studied.According to the location type of the placenta previa,selecting the best opportunity to terminate the pregnancy.Results:3 cases were premature labor,there was a death one among them; 5 cases were spontaneous labor; 4 cases were emergency operation for hemorrhea,there was a death one among them for asphyxia ; 1 case was oxygen-deficiency cerebrosis; 38 cases were cesarean section. 45 neonates were good, their average weight was 2950g. 50 cases of puerpera have no postpartum infection.Conclusion:The placenta previa was associated with uterine cicatrization induced by multiparity, grand multiparity, cesarean section, induced abortion and so on. According to the condition of fetus maturity, hemorrhage and so on, waiting for an opportunity should be selected to termanate the pregnancy during enforcement period.%目的:分析前置胎盘成因及最佳处置方法,提高护理质量,尽保母婴平安。方法:收集前置胎盘50例,依胎盘位置分型,选择最佳时间终止妊娠。结果:早产3例1例死亡;自然分娩5例;大出血急诊手术4例1例窒息死亡、1例缺血缺氧性脑病;适时剖宫产38例。45例婴儿良好,平均体重3050克。50例产妇无产后感染。结论:前置胎盘与经产、多产、剖宫产、人工流产等致子宫瘢痕形成有关。实施期待期疗法,根据胎儿成熟、出血等情况适时终止妊娠,达到母亲安全婴儿健康。

  12. Experiencia de colaboración interdisciplinar en la Formación Previa de las prácticas de enseñanza del Grado en Educación Primaria

    OpenAIRE

    Porlán Ariza, Rafael; Ferreras Listán, Mario; Gallardo Saborido, Emilio José; Navarro Pablo, Macarena; Solís Ramírez, Emilio

    2013-01-01

    La experiencia que se presenta en este trabajo se ha implementado en la asignatura de Formación Previa del Grado en Educación Primaria de la Universidad de Sevilla. Al ser el primer curso de impartición de dicha asignatura y dada su importancia para la mejora de las prácticas de nuestros estudiantes, nos pareció necesaria la colaboración interdisciplinar del profesorado implicado. Concretamente, los autores de esta contribución hemos trabajado durante las sesiones las transiciones...

  13. Satisfacción de los pacientes según diagnóstico motivo de ingreso: diferencias entre las expectativas previas al ingreso y la calidad percibida al alta.

    OpenAIRE

    Lledó Rodríguez, Rafael

    2001-01-01

    [spa] La satisfacción del usuario de los hospitales es un indicador de calidad de la asistencia prestada. Entendemos la satisfacción como la diferencia con signo positivo entre la calidad percibida al alta y las expectativas previas al ingreso hospitalario. Un factor determinante en estas impresiones es el diagnóstico que justifica el ingreso. Así, se establecieron tres grupos (catarata, hernia de la cavidad abdominal y parto) para analizar las diferencias entre las puntuaciones al alta y la...

  14. Aumento mamario estético con transferencia de tejido graso autólogo (TTGA sin expansión previa

    Directory of Open Access Journals (Sweden)

    S. Negrete-Hernández

    2013-12-01

    Full Text Available Presentamos una serie de 50 pacientes de sexo femenino que no deseaban implantes y solicitan un aumento mamario de 1 a 1.5 tallas, a las que se les realizó únicamente transferencia de tejido graso autólogo (TTGA sin expansión previa, con seguimiento de 5 años revisadas entre septiembre del 2004 y enero del 2012; en 47 pacientes el procedimiento se hizo como tratamiento estético único y en 3 para corrección de asimetría. Las edades oscilaron entre los 18 y los 48 años. Los sitios donantes fueron por orden de importancia: región supraglútea, trocantérea e infraumbilical. La obtención del tejido se realizó con cánula de 3 mm y liposuctor a media atmósfera. La preparación de la grasa consistió únicamente en la decantación del exceso de solución de Klein y eliminación de las fibras elásticas. La colocación del tejido graso transferido se realizó con cánula de 3 mm espatulada, en depósitos largos, de 2 mm de ancho (churritos, en forma radiada y en diferentes niveles, intramuscular en pectoral mayor, sub y periglandular hasta obtener el volumen deseado. Se aplicaron de 250 a 400 cc de grasa en un solo tiempo quirúrgico y en 8 pacientes, en un segundo tiempo 3 meses después, fue necesario aplicar la cantidad requerida para corrección de asimetrías. Clínicamente apreciamos una reabsorción del 10 al 15% de la grasa infiltrada. Los resultados fueron satisfactorios y sostenidos en el tiempo de seguimiento, el pecho mantuvo su forma natural de gota por efecto de la gravedad o cuando las pacientes sufrieron ganancias o pérdida de peso de consideración.

  15. 283 例中央性前置胎盘产后出血高危因素分析%Analysis of 283 case of central placenta previa in patients with high-risk factors of postpartum hemorrhage

    Institute of Scientific and Technical Information of China (English)

    贾红梅; 胡贵平; 徐华东; 张永明; 陈斌; 马遥

    2015-01-01

    目的:观察中央性前置胎盘的临床表现及结局,探讨其产后出血的高危因素. 方法:回顾性分析我院2006年9月至2015年6月283例中央性前置胎盘患者的临床资料,根据是否并发产后出血而分为2组. 结果:产后出血组114例,产后未出血组169例;产后出血组的产前出血率、人工流产史发生率以及并发胎盘粘连、胎盘植入率均显著高于产后未出血组(P <0.05);Logistic 回归分析表明,双胎(OR =10.94,95%CI:1.120~106.871)、妊娠期合并胎盘粘连(OR=4.11, 95%CI:0.946~17.852)、产前出血(OR=2.60,95%CI:1.328~5.089)、产检次数(OR =1.13,95%CI: 1.026 ~1.243)以及并发贫血(OR =2.37,95%CI:1.078~5.206 )均是孕产妇发生产后出血的高危险因素,而高龄初产( OR=0.35 ,95%CI:0.117~1.057 )、妊娠期合并瘢痕子宫( OR=0.285 ,95%CI:0.057~1.441 )为中央性前置胎盘并发产后出血的保护因素. 结论:中央性前置胎盘常并发多种不良妊娠结局;双胎、妊娠期合并胎盘粘连、产前出血、并发贫血等可能为其并发产后出血的高危因素,高龄初产、妊娠期合并瘢痕子宫可能是中央性前置胎盘并发产后出血的保护因素.%Objective:To observe the clinical manifestation and outcome of central placenta previa and further explore the risk factors of postpartum hemorrhage with central placenta previa .Methods:283 patients with central placenta previa in our hospital between September ,2006 to June,2015 were retrospectively analyzed .According to the circumstance of postpartum hemorrhage , they were divided into two groups , postpartum hemorrhage group and no postpartum hemorrhage .Results: There were 114 cases in postpartum hemorrhage group and 169 cases in no postpartum hemorrhage group . Compared with no postpartum hemorrhage group , the rate of antepartum haemorrhage, abortion, placenta conglutination and placenta implantation were significantly higher in postpartum hemorrhage group ( P<0.05) .Logistic

  16. 高龄初产妇前置胎盘的高危因素与妊娠结局分析%Risk factors and outcomes of placenta previa among uniparas over thirty-five years old

    Institute of Scientific and Technical Information of China (English)

    张红卫; 郭利

    2014-01-01

    目的:了解高龄初产妇前置胎盘的发生率、高危因素及妊娠结局。方法以医院为基础收集资料,共纳入1065人为研究对象。用χ2检验分析比较高龄初产妇在人口学资料、妊娠分娩因素及妊娠并发症等条件下前置胎盘的发生率,用多因素Logistic回归模型分析前置胎盘的高危因素及不良结局。结果所有1065名高龄初产妇中,905人(85.0%)未发生产后出血,160人(15.0%)发生产后出血。160名产后出血的高龄初产妇中,13人(8.13%)发生前置胎盘;950名未产后出血的高龄初产妇中,12人(1.33%)发生前置胎盘。所有高龄初产妇中,前置胎盘发生率在是否产后出血、是否宫缩乏力者间的比较,差异有统计学意义(χ2值分别为24.53,12.10;P<0.05),在其他妊娠并发症中前置胎盘的发生率比较,差异无统计学意义( P>0.05)。在所有高龄初产妇中,未发现人口学及妊娠产前相关因素,前置胎盘的不良结局为早产(AOR:3.26,95%CI:1.43~7.44)、产后出血(AOR:5.38,95%CI:2.37~12.23);在产后出血的高龄初产妇中,前置胎盘的不良结局为早产(AOR:6.28,95%CI:1.65~23.82)。结论高龄初产妇是前置胎盘的高危人群,应尽快确认不良结局,以便及早采取应对措施。%Objective To investigate the incidence , risk factors and pregnancy outcomes of placenta previa among uniparas aged over thirty-five.Methods This hospital-based study included 1 065 objects from June 2011 to May 2012 .The chi-square test was used to compare the incidence of placenta plavia among demographic information , obstetric risk factors , and maternal pregnancy outcomes .And the multiple logistic model was used to identify the risk factors independently associated with placenta previa .Results Totals of 160 (15.0%) uniparas had postpartum hemorrhage

  17. La consulta previa como requisito obligatorio dentro de trámites administrativos cuyo contenido pueda afectar en forma directa a comunidades indígenas y tribales en Colombia

    Directory of Open Access Journals (Sweden)

    Carlos Eduardo Salinas Alvarado

    2011-12-01

    Full Text Available El presente artículo pone de presente las oscilaciones que la Corte Constitucional de Colombia ha tenido en torno del derecho de la consulta previa, dando cuenta de los alcances y vicisitudes de la manera como se ha interpretado el Convenio 169 de la OIT ratificado por Colombia en la Ley 21 de 1991 y cómo este derecho, dada la omisión legislativa al respecto, ha sido de construcción pretoriana, que no obstante sus vaivenes ha contribuido a darle cuerpo a la consulta previa, por lo que, teniendo en cuenta la enorme variedad de medidas administrativas, susceptibles de ser consultadas, se hace énfasis en el otorgamiento de licencias ambientales, en el marco de la democracia participativa colombiana, constituyendo un tema poco pacífico de la antropología jurídica en Colombia y otros países de la región, pues hay una aparente pugna entre los derechos de las minorías y el derecho ambiental con el desarrollo industrial que concierne a la generalidad de los asociados.

  18. 凶险型前置胎盘对孕产妇的危害性研究%Research on the Perniciousness of Dangerous Placenta Previa on the Maternal

    Institute of Scientific and Technical Information of China (English)

    梁旭霞; 邬华; 张春; 李静; 陈慧

    2012-01-01

    Objective: To investigate the perniciousness of dangerous placenta previa on the maternal. Methods: 40 cases of dangerous placenta previa admitted in our hospital from March 2009 to March 2012 were selected, the clinical data were retrospectively analyzed. Results: The implanted placenta previa (implanted group) accounted for 55% of dangerous placenta previa, antepartum hemorrhage accounted for 81.8%, while 8 cases (44.4%) of antepartum hemorrhage occurred in non-implanted group (P0.05). Conclusion: For dangerous type of placenta previa maternal, it should strengthen the observation in surgery and place the shunt after surgery. In this way it could reduce the hazards for maternal with the maximum extent and ensure the safety of mother and child.%目的:探讨凶险型前置胎盘对孕产妇的危害性.方法:选择我院2009年3月至2012年3月收治的凶险性前置胎盘40例,对其临床资料进行回顾性分析.结果:植入型前置胎盘(植入组)占凶险型前置胎盘的55%(22例),非植入型前置胎盘(非植入组)占45%(18例).植入组产前出血18例,占81.8%,非植入组产前出血8例,占44.4%,差异有统计学意义.植入组完全性前置胎盘17例,占77.3%;部分性4例,占18.2%;边缘性1例,占4.5%.非植入组分别为5例,占27.8%;1例,占5.6%; 12例,占66.7%.两组之间比较差异具有统计学意义(P<0.05).两组术前Hb值无明显差异(P>0.05),术后非植入组Hb水平高于植入组,手术时间、术中出血量、产后出血均显著少于植入组,差异均有统计学意义(P<0.05).非植入组术中输血、切除子宫、应用宫腔纱条的百分率均显著低于植入组(P<0.05).两组术中刮宫、徒手剥胎盘的百分率比较均无明显差异(P>0.05).结论:对于凶险型前置胎盘孕产妇,产前应做好预防保健,术中加强观察,术中术后放置腹腔引流管,最大限度的降低对孕产妇的危害,确保母婴安全.

  19. 前置胎盘相关危险因素分析及对妊娠的影响%Analysis of risk factors associated with placenta previa and its effect on pregnancy

    Institute of Scientific and Technical Information of China (English)

    余苑婷

    2014-01-01

    目的:探讨前置胎盘的相关危险因素及对妊娠结局的影响。方法将3960例孕产妇中确诊为胎盘前置的60例设为观察组,随机选取60例同期正常孕产妇为对照组,比较两组的临床资料及妊娠结局,总结前置胎盘的危险因素。结果前置胎盘60例,发病率为1.5%,其中,中央型18例(30.0%),部分型5例(8.3%),边缘型37例(61.7%)。年龄≥35岁、文化程度低、有流产史、有分娩史、有剖宫产史及盆腔炎症史是导致前置胎盘发病的危险因素(P<0.05),妊娠结局比较发现观察组低体重儿数量、早产儿的例数及1 min Apgar评分及5 min Apgar评分≤7分新生儿明显高于对照组,产妇发生胎盘植入及产后出血的危险性明显增加(P<0.05)。结论高龄、文化程度低、产妇流产史、分娩史、剖宫产史、盆腔炎症史是导致胎盘前置的重要危险因素,前置胎盘可导致新生儿窒息,增加孕产妇胎盘植入、胎盘粘连及产后出血的发生率。%Objective To investigate risk factors associated with placenta previa and its effect on pregnancy outcome. Methods From December 2009 to December 2012, out of 3960 cases, selected 60 cases of pregnant women with placenta previa as observation group, 60 cases of normal pregnant women as control group, clinical information and pregnancy outcome of two groups were compared. Results 60 cases of placenta previa, the incidence rate was 1.5%, aged above 35 years old, low education level, history of abortion, history of childbirth, cesarean section history and the history of pelvic inflammatory disease were risk factors for onset of placenta previa(P<0.05), observation group and number of low birth weight children newborn 1min Apgar score ≤ 7 points, which was significantly higher than control group, occurrence of maternal placenta accreta and postpartum hemorrhage significantly increased(P<0.05). Conclusion Age, low education level, maternal abortion

  20. Clinical analysis on intraoperative hemorrhage status of pernicious placenta previa patients%12例凶险性前置胎盘术中出血情况的临床分析

    Institute of Scientific and Technical Information of China (English)

    李秀彦; 茹美艳

    2012-01-01

    OBJECTIVE To investigate the reason and precautionary measures of massive haemorrhage during repeated cesare-an section in pregnancy patients with scar uterous and placenta previa. METHODS The clinical data of 15S parturients patients who undergoing cesarean section again from 2009 to 2011 were analyzed retrospectively, 12 cases of all patients were with placenta previa, 143 cases were without. RESULTS The rate of massive haemorrhage, placenta accreta and threatened uterine rupture in group re-cesarean section (who with cicatricial uterus and placenta previa) were higher respectively than those whitout placenta previa-lntraoperauve massive hemorrhage occured in S cases who with the central type placenta praevia, and 4 cases were placenta previa and threatened uterine rupture. CONCLUSION Antetheca central placenta praevia plus placenta implantation is a chief factor of massive hemorrhage of intraoperative cesarean section. Making good preoperalive preparations, such as uterine artery embolization (UAE), is significant for the outcome of pregnancy.%目的 探讨癜痕子宫伴前置胎盘(凶险性前置胎盘)再次剖宫产患者术中大出血的发生原因以及预防措施.方法 收集分析2009年9月~2011年11月某院行单胎再次剖宫产155例患者的临床资料,其中伴前置胎盘者12例(观察组),瘢痕子宫不伴前置胎盘143例(对照组).癜痕子宫伴前置胎盘者12例术中出血原因进行归纳总结分析.结果 癜痕子宫伴前置胎盘组合并中央性前置胎盘,胎盘植入、先兆子宫破裂均高于癜痕子宫不伴前置胎盘组.5例瘢痕子宫伴前置胎盘剖宫产术中大出血均为胎盘植入,且5例均为中央性前置胎盘,4例是前壁胎盘合并先兆子宫破裂.结论 前壁中央性前置胎盘合并胎盘植入是瘢痕子宫伴前置胎盘剖宫产术中大出血主要原因.术前做好相应预防措施,必要时做好子宫动脉栓塞准备,尽可能保留子宫,对妊娠结局非常重要.

  1. Nursing of ritodrine hydrochloride in treatment of placenea previa state of threatened abortion%利托君治疗胎盘前置状态先兆流产的护理

    Institute of Scientific and Technical Information of China (English)

    沈志娟

    2012-01-01

    Objective:To discuss the nursing measures of placenta previa with threatened abortion using hydrochloric acid ritodrine therapy. Methods :32 cases of placenta previa in our state threatened abortion pregnant women,ritodrine hydrochloride 100 mg join 5% glucose intravenous infusion of 500 ml,maintain the uterine contraction after the change to oral,and well before medication pursing assessment, psychological nursing care,close observation in the medication process condition changes,drug reaction,giving life,diet nursing care. Results:32 cases of vaginal bleeding after drug use in pregnant women reduced, adverse reactions-have been eased .more than 30 cases of maternal gestational age 36 -weeks extension,strengthening mucle success rate 93.75%. Conclusion:Rational use of-ritodrine hydrochloride,could reduced the placenta previa threatened abortion bleeding,prolonged pregnancy cycle,improved the success rate of fetus.%目的:探讨胎盘前置状态先兆流产使用盐酸利托君治疗时的护理措施.方法:对我院胎盘前置状态先兆流产32例孕妇,给予100 mg盐酸利托君加入5%葡萄糖500 ml静脉滴注,维持宫缩消失后改为口服,并在用药前做好护理评估、心理护理,用药过程中严密观察病情变化、用药反应,给予生活、饮食护理.结果:32例孕妇用药后阴道出血减少,不良反应得到缓解,30例孕妇延长孕龄36周以上,保胎成功率为93.75%.结论:盐酸利托君的合理使用,可以减少胎盘前置状态先兆流产的出血,延长妊娠周数,提高保胎成功率.

  2. Influence of scarred uterus pregnancy on pregnancy outcome in patients with placenta previa%瘢痕子宫妊娠并发前置胎盘对妊娠结局的影响

    Institute of Scientific and Technical Information of China (English)

    邬华; 梁旭霞

    2013-01-01

    目的 探讨瘢痕子宫妊娠并发前置胎盘对妊娠结局的影响.方法 68例前置胎盘患者根据是否存在瘢痕子宫分为瘢痕子宫组32例和非瘢痕子宫组36例,比较2组患者的妊娠结局.结果 瘢痕子宫组患者剖宫产率、产后出血率、子宫切除率、新生儿早产发生率、窒息发生率和围生儿病死率均显著高于非瘢痕子宫组(P<0.05),瘢痕子宫组患者产后24 h出血量显著大于非瘢痕子宫组(P<0.05),瘢痕子宫组新生儿体质量显著低于非瘢痕子宫组(P<0.05).结论 瘢痕子宫妊娠并发前置胎盘可增加产妇剖宫产及新生儿早产、窒息、死亡的危险.%Objective To investigate the influence of scarred uterus pregnancy on pregnancy outcome in patients with placenta previa. Methods Sixty-eight patients with placenta previa were divided into scarred uterus group (n =32) and non-scarred uterus group(n =36) according to whether had scarred uterus, then the pregnancy outcome was compared between the two groups. Results The rates of cesarean section, postpartum hemorrhage, hysterectomia, omotocia, apnoea neonatorum and death in the scarred uterus group were significantly higher than those in the non-scarred uterus group(P <0.05), the bleeding of postpartum 24 hours in the scarred uterus group was significantly more than that in the non-scarred uterus group (P < 0. 05), but the body weight of neonates in the scarred uterus group was significantly lower than that in the non-scarred uterus group(P<0. 05). Conclusion The occurrence of scarred uterus pregnancy in patients with placenta previa can increase the risks of cesarean section, omotocia, asphyxia and death.

  3. Clinical analysis of 30 cases on cesarean section of placenta previa with scarred uterine%前置胎盘合并瘢痕子宫剖宫产30例临床分析

    Institute of Scientific and Technical Information of China (English)

    丁卫

    2011-01-01

    Objective To analyze the harm of placenta previa with scarred uterine on mother and neonate,and improve the understanding of it. Methods 108 cases with placent previa from January 2008 to May 2010 in our hospital were analyzed retrospectively, among which there were 30 cases of scarred uterine, 78 cases of non-scarred uterine. Results 108 patients were terminated pregnancy through cesarean section. The Postpartum hemorrhage in scarred uterine's group was significantly higher than the group of non-scarred uterine (P<0.05). The incidences of placenta accreta, placenta adhesion, hysterectomy were significantly higher than non-scarred uterine group(P<0.05). However the birth weight was significantly lower than non-scarred uterus group (P<0.05).Preterm, fetal distress, neonatal asphyxia, perinatal mortality were significantly higher than non-scarred uterus group (P<0.05). Conclusion Placenta previa with the scarred uterine increased significantly the maternal and perinatal complications and risk.%目的 分析前置胎盘合并瘢痕子宫对孕产妇及围生儿的危害,提高对前置胎盘合并瘢痕子宫的认识.方法回顾性分析终止妊娠的前置胎盘108例,其中既往有剖宫产史30例(瘢痕子宫组),无剖宫产史78例(非瘢痕子宫组).结果:108例均行剖官产术终止妊娠.瘢痕子宫组产后出血量大于非瘢痕子宫组,其胎盘植入、胎盘粘连、子宫切除的发生率均高于非瘢痕子宫组,差异有统计学意义(P<0.05).瘢痕子宫组新生儿体质量低于非瘢痕子宫组,其早产、胎儿窘迫、新生儿窒息、围生儿死亡均高于非瘢痕子宫组,差异有统计学意义(P<0.05).结论 前置胎盘合并瘢痕子宫明显增加孕产妇及围生儿的并发症和危险性.

  4. 35例瘢痕子宫合并前置胎盘妊娠结局分析%35 cases of uterine scar pregnancy outcome analysis of placenta previa

    Institute of Scientific and Technical Information of China (English)

    张金瑾

    2014-01-01

    目的:探讨瘢痕子宫合并前置胎盘对母婴妊娠结局的影响。方法选取2002年8月至2013年8月期间在我院住院分娩瘢痕子宫合并前置胎盘产妇35例为观察组,并选取同期单纯前置胎盘产妇35例作为对照组,观察比较两组产妇产后出血量、子宫切除率、胎盘植入等情况。结果观察组术中出血量、子宫切除率、胎盘植入率以及手术时间均高于对照组,两组比较差异具有统计学意义(P<0.01);观察组弥散性血管内凝血(DIC)、失血性休克、子宫切除等显著多于对照组,两组比较差异有统计学意义(P<0.01);观察组新生儿早产率、窒息发生率显著高于对照组,差异有统计学意义(P<0.01);观察组新生儿体重低于对照组,两组比较差异有统计学意义(t=5.897,P<0.05)。结论瘢痕子宫合并前置胎盘对妊娠结局具有重要影响,术前应予以高度重视,做好充分准备,必要时及时切除子宫。%Objective To investigate the merger placenta previa uterine scar pregnancy outcome for mother and child.Methods Thirty-five cases of placenta previa during the delivery of maternal uterine scar from August 2002 to August 2013 in our hospital were recrui-ted as the observation group,and the corresponding period of maternal placenta previa alone was selected as the control group.Maternal post-partum hemorrhage,hysterectomy rates,placenta accreta and so on of the two groups were compared.Results The blood loss,hysterectomy rates,placental implantation rate and operative time were higher in the observation group,and the difference was statistically significant (P<0.01);disseminated intravascular coagulation (DIC),hemorrhagic shock,and hysterectomy in the observation group happened more than the control group,and the difference was statistically significant (P<0.01);the rate of premature birth and asphyxia were significantly higher in the

  5. 植入型凶险性前置胎盘应用磁共振的临床分析%Clinical Analysis of Magnetic Resonance in the Application of Implantable Dangerous Placenta Previa

    Institute of Scientific and Technical Information of China (English)

    吕冲

    2016-01-01

    目的:探究对植入型凶险性前置胎盘的临床诊断中磁共振的临床应用情况。方法回顾性分析2013年7月—2015年6月在该院接诊的凶险性前置胎盘患者60例,其中植入型凶险性前置胎盘患者25例,结合患者的手术和病理检查结果为参考标准,对植入型凶险性前置胎盘患者进行核磁共振以及彩色多普勒超声检查的联合应用评估,同时患者分别为粘连胎盘、植入性胎盘以及穿透性胎盘,结床分析。结果在胎盘植入的临床诊断中磁共振与磁共振和彩超联合诊断的临床诊断价值无合患者的病症分型对患者的磁共振图像进行临统计学差异(P﹥0.05),但结合患者的病理分型对磁共振的诊断准确率进行判定显示差异有统计学意义(P﹤0.05),在穿透性胎盘的诊断中其应用价值最高,而在粘连性胎盘的诊断中其应用价值则相对较低,数据显示差异有统计学意义(P﹤0.05)。结论在植入型凶险性前置胎盘的临床诊断中应用磁共振具有较高的诊断准确性,同时对患者的临床分型也有一定的应用,值得在临床上推广应用。%Objective To discuss the clinical application situation of magnetic resonance in the clinical diagnosis of im-plantable dangerous placenta previa. Methods 60 cases of patients with dangerous placenta previa treated in our hospital from June 2013 to June 2015 were retrospectively analyzed, among them, 25 cases were implantable dangerous placenta previa and they were evaluated by the combined application of magnetic resonance and color Doppler ultrasonography ac-cording to the operative and pathological examination results and divided into the adherent placenta, implantable percreta and placenta percreta according to the clinical analysis. Results The difference in the clinical diagnostic value between the magnetic resonance diagnosis of placenta implantation and magnetic resonance combined with colour

  6. 前置胎盘、胎盘粘连及胎盘植入与人工流产的关系研究%Relationship research of placenta previa,adherent placenta and placenta implantation

    Institute of Scientific and Technical Information of China (English)

    刘秀华

    2014-01-01

    目的:研究前置胎盘、胎盘粘连及胎盘植入与人工流产的相关性。方法对入我院进行分娩的3280例孕妇资料进行分析,选择其中342例发生胎盘异常孕妇进行研究,包括未经人工流产和人工流产的孕妇前置胎盘、胎盘粘连及胎盘植入的发生率;人工流产的次数与前置胎盘、胎盘粘连及胎盘植入的关系以及围产期感染相关因素的研究。结果未经人工流产孕妇胎盘总的异常率为3.7%,人工流产孕妇胎盘总的异常率为14.3%,两组胎盘异常总发生率比较显著差异(P<0.05);流产次数越多,胎盘异常发生率随着次数增高而增高;围产期感染与产前贫血、宫腔感染和产妇营养不良关系密切(P<0.05)。结论前置胎盘、胎盘粘连及胎盘植入与人工流产的关系密切,多次人工流产易导致胎盘异常情况的发生,又易由于胎盘异常导致产后出血,育龄女性应尽量避免人工流产。%Objective To study the correlation between placenta previa, adherent placenta and placenta implantation. Methods Data of 3280 pregnant women delivered in our hospital were analyzed, of which 342 pregnant women with abnormal placenta were selected for research, including the incidences of placenta previa, adherent placenta and placenta implantation of the pregnant women having gone and having not gone through induced abortion, relationship between the times of induced abortion and the placenta previa, adherent placenta and placenta implantation, and study on perinatal infection related factors. Results The total abnormal placenta rate of the pregnant women having not gone through induced abortion was 3.7%and that of those having gone through induced abortion was 14.3%, with significant difference between the total incidences of abnormal placenta(P < 0.05).The incidence of abnormal placenta went up as the times of induced abortion rose; Perinatal infection was closely related to

  7. 剖宫产术后再次妊娠并发前置胎盘的临床分析%The Clinical Study of Pregnancy Complicated With Placenta Previa Again After Cesarean Section

    Institute of Scientific and Technical Information of China (English)

    叶新红

    2015-01-01

    Objective To observe and evaluate the clinical analysis of pregnancy complicated with placenta previa again after cesarean section, and provide a reference for maternal perinatal mortality and reference significance. Methods 38 cases were complicated with placenta previa maternal pregnancy as observation group from June 2011 to December 2014 in our hospital, during the same period were randomly selected patients with cesarean section prehistoric buy placenta 38 cases as control group, by comparing the control group and observation group of maternal and perinatal clinical manifestations. Results Through clinical observation and comparative analysis, the cesarean section rate of observation group was obviously higher than that of control group, the difference statistically signiifcant (P<0.05). Observation group of maternal placenta implantation rate, postpartum blood loss and incidence of uterine rupture were signiifcantly higher than that of control group (P<0.05). In perinatal premature birth rate, the rate of fetal distress, observation group is higher than the control group (P<0.05). Conclusion The pregnancy complicated with placenta previa again after cesarean section may cause increased maternal and perinatal complications and risk, to guide the rational time interval of pregnancy again after cesarean section, thus effectively avoid dangerous sex of placenta previa.%目的:观察和评价剖宫产术后再次妊娠并发前置胎盘的临床分析,为孕产妇围产儿死亡率提供参考和借鉴意义。方法选取2011年6月~2014年12月我院收治的因剖宫产术再次妊娠并发前置胎盘孕产妇38例作为观察组,随机选取同期无剖宫产术史前置胎盘患者38例作为对照组,通过对比对照组与观察组孕产妇和围产儿的临床表现。结果通过临床观察和对比分析,观察组剖宫产率高于对照组,差异具有统计学意义(P<0.05);观察组孕产妇胎盘植入发生率、产后出

  8. 前置胎盘的发生率变化与人工流产史产妇比例变化的关系研究%Relationship between the incidence change in placenta previa and the proportion change of puerpera with abortion history

    Institute of Scientific and Technical Information of China (English)

    邹晓红; 苏庆霞; 谢图强

    2011-01-01

    目的 探讨前置胎盘发生率的变化,分析其与人流之间的关系并寻找预防前置胎盘相应的对策。方法 以回顾性分析方法对20年来我院的496例前置胎盘病例及既往人流产妇病例进行对比分析。结果 前置胎盘发生率为1.01%,前置胎盘的发生率近十五年来显著上升,中央型前置胎盘构成比显著升高(P<0.01),前置胎盘患者人流史比例高。既往人流产妇发生率为33.6%,既往人流产妇比例近十五年来显著上升(P<0.05)。结论 既往人流产妇比例增多可能是前置胎盘发生率上升的原因%Objective To explore the change of the placenta previa incidence, and analyze the relationship between abortion rate and it, looking for corresponding prevention countermeasures for placenta previa. Methods With retrospective analysis method, 496 cases of placenta previa in 20 years were analyzed comparing with those cases with past abortion puerpera history. Results The placenta previa incidence is 1.01%, and it increased significantly over the past 15 years. The constituent ratios of central type placenta previa significantly increased too. The abortion history has a high proportion in the placenta previa patients. The past puerpera abortion incidence was 33.6%, which rose dramatically over the past 15 years. Conclusion The past puerpera abortion incidence' s increasing may be the reason why incidence of the placenta previa rises.

  9. Diagnostic value of MRI for placenta previa with placental implantation%磁共振在前置胎盘伴胎盘植入中的诊断价值

    Institute of Scientific and Technical Information of China (English)

    高继勇; 梅海炳; 高军

    2011-01-01

    目的 探讨磁共振扫描对前置胎盘伴植入的诊断价值.方法 23 例临床诊断前置胎盘的患者行MRI平扫,术后进行回顾分析.结果 胎盘子宫分界正常10 例,粘连3 例,植入8 例,穿通2 例.术后及病理诊断为正常6例,粘连4 例,植入11 例,穿通2 例.术前MRI 诊断为植入及穿通者,与术后相符,术后诊断为植入者2 例报告为粘连,1 例报告为正常.术后诊断为粘连者,3 例术前报告为正常.结论 磁共振对前置胎盘伴有胎盘植入及穿通能提供准确的诊断.%Objective To investigate the MRI diagnostic value for placenta previa with placental implantation. Methods MRI of 23 patients with placenta previa was retrospectively analyzed. Results The boundaries of the placenta were clear from (10), adherent with (3), implanted in (8), or penetrating through (2) the myometrium on MRI. 6 cases were diagnosed as normal after surgery, 4 cases of adhesion, 11 cases were implanted, 2 cases of penetrating. The MRI diagnosis of placental implantation (8) and penetration (2) was confirmed operatively. Two cases of implantation were erroneously classified as placental adhesion and 1 case was misinterpreted as normal. 3 out of 4 cases of placental adhesion were missed on MRI. Conclusion MRI is helpful in diagnosing placental implantation.

  10. 中央性前置胎盘并发胎盘植入59例临床分析%Clinical analysis of 59 cases of complete placenta previa with placenta increta

    Institute of Scientific and Technical Information of China (English)

    王明; 张力; 刘兴会; 卫蔷

    2011-01-01

    Objective:To discuss the high risk factors and peripartum management of complete placenta previa complicated with placenta increta. Method: Retrospectively analyzed all the 896 cases of complete placenta previa hospitalized in West China Second Hospital of Sichuan University from January 2000 to December 2009 .of which 59 cases complicated with placenta increta. Result : ( 1) The incidence of complete placenta previa was 2. 26% in recent 10 years,and the morbidity of placenta increta among women with complete placenta previa was 6. 58% ( 59/896) . (2) The high risk factors of complete placenta previa with placenta increta included more than 35 years old,not less than twice abortions and previous cesarean delivery.(3) The amount of postpartum hemorrhage in placernta increta group was significantly higher than that in non- placenta increta group. The mean postpartum hemorrhage in placenta increta group was 2846.19ml. ( 4 ) Surgical treatment was done in all placenta increta patients ( 15 cases received cesarean hysterectomy,44 cases received conservative surgical therapies). The incidence of cesarean hysterectomy in placenta increta group was 25. 42% ( 15/59). But in nonplacenta increta group it was 0. 96% ( 8/837) . Conclusion : ( 1) Placenta increta must be considered if the pregnant woman with complete placenta previa complicated with previous cesarean delivery or multiple abortions, or if she was more than 35 years old. (2) To reduce the side effect to mother and fetus because of serious puerperal hemorrhage,peripartun clinical management is necessary. ( 3) The conservative surgical treatment is very important as well as hysterectomy.%目的:探讨中央性前置胎盘并发胎盘植入的高危因素及围生期处理.方法:回顾性分析2000年1月~2009年12月四川大学华西第二医院产科收治的896例中央性前置胎盘患者(其中59例并发胎盘植入)的临床资料.结果:(1)我院近10年来中央性前置胎盘的发生率为2

  11. Diagnosis of placenta previa accreta by two dimensional ultrasonography and color doppler in patients with cesarean section%二维超声及彩色多普勒对瘢痕子宫合并前置胎盘植入的诊断及临床分析

    Institute of Scientific and Technical Information of China (English)

    施华芳; 皮丕湘; 丁依玲

    2012-01-01

    目的:探讨二维超声及彩色多普勒诊断瘢痕子宫患者合并前置胎盘植入的准确性.方法:41例曾接受剖宫产的患者本次妊娠28周后行二维超声及彩色多普勒检查,探查胎盘与子宫及膀胱之间的特征性声像图表现,确认有部分型或完全性前置胎盘,并进一步判断是否有胎盘植入,对所有病例进行追踪,以手术所见及病检结果为诊断金标准.结果:在所有41例瘢痕子宫合并前置胎盘的患者中,二维超声及彩色多普勒提示22例合并前置胎盘植入,产后经手术和病检确诊20例,19例产前二维超声及彩色多普勒未提示胎盘植入者中,产后证实有胎盘植入1例,敏感性为95.24%,特异性为94.74%.在所有确诊胎盘植入的病例中,最常见的二维超声图像为在胎盘实质和基底部可见无回声腔隙,以及彩色多普勒在子宫胎盘膀胱之间探及丰富血彩,均为95.24%.结论:应用二维超声及彩色多普勒对瘢痕子宫合并前置胎盘植入有较高的敏感性和特异性,二者联合基本可以明确诊断.%Objective: To determine the accuracy of two dismensional sonography and color doppler in diagnosing placenta previa accreta in patients with previous cesarean section.Methods: Forty-one patients with previous cesarean sections were confirmed to have partial or total placenta previa in the current pregnancy and were given ultrasound examinations after the 28th week of gestation. Specific ultrasound features of the placenta and its interphase with the uterus and the bladder for placenta accreta were checked by two-dimensional ultrasonography and color Doppler. All the patients were traced until delivery. The golden standard in diagnosis was the intraoperative finding and the pathologic exam. Results: Twenty-two patients had ultrasonographic evidence of placenta previa, 20 of which were later confirmed placenta previa accreta intraoperatively. Nineteen patients had no ultrasound evidence of

  12. 卡前列素氨丁三醇预防前置胎盘产后出血的临床疗效%Clinical effect of carboprost tromethamine injection in the prevention of the postpartum hemorrhage of placenta previa

    Institute of Scientific and Technical Information of China (English)

    李智卿

    2015-01-01

    Objective:To compare the treatment effect of carboprost tromethamine injection and oxytocin in the treatment of the postpartum hemorrhage of placenta previa. Methods:Eighty-six cases of the pregnant women with placenta previa were selected from Dec. 2012 to Aug 2014 and randomly divided into an oxytocin group with 29 cases, a treatment group (carboprost tromethamine injection) with 30 ones, and a combined group with 27 ones. In the operation, the oxytocin group was given oxytocin 20 u, the treatment group given the carboprost tromethamine injection 250μg, and the combined group given oxytocin 20 u and carboprost tromethamine injection 250μg. The 2 h and 24 h postpartum hemorrhage volume, the incidence of the postpartum hemorrhage, hemostasis time, blood transfusion rate and complications were observed. Results:The postoperative bleeding rate, blood transfusion rate, amount of bleeding after 2 and 24 hours operation, hemostasis time, hysterectomy incidence in the treatment group and the combined group were signiifcantly lower than those in the oxytocin group (P0.05). Conclusion:Carboprost tromethamine injection can effectively reduce the postpartum hemorrhage of placenta previa, the incidence of postpartum hemorrhage, hemostasis time, blood transfusion rate, uterine resection rate, and has less adverse reaction and better effect if combined with oxytocin.%目的:比较卡前列素氨丁三醇与缩宫素治疗前置胎盘产后出血的疗效。方法:选择2012年12月-2014年8月前置胎盘产妇86例,随机分为缩宫素组29例、治疗组(卡前列素氨丁三醇)30例,联合组27例。术中缩宫素组给予缩宫素20 u,治疗组给予卡前列素氨丁三醇250μg,联合组给予缩宫素20 u和卡前列素氨丁三醇250μg,观察产后2 h、24 h出血量、产后出血发生率、止血时间、输血率及并发症等。结果:治疗组和联合组的术后出血率、输血率、术后2 h和24 h出血量、止血时间、子宫

  13. 护理干预对21例前置胎盘期待治疗效果的影响%Effects of Nursing Intervention on Expectation Treatment of Placenta Previa

    Institute of Scientific and Technical Information of China (English)

    卢碧君

    2014-01-01

    目的:探讨人性化的护理干预对前置胎盘期待治疗的临床效果,进一步指导临床。方法:选取2010年1月-2013年12月笔者所在医院收治的42例前置胎盘患者,按照随机对照的原则,将患者分为观察组和对照组,各21例。对照组给予入院常规护理,观察组在对照组的基础上给予人性化护理干预,观察两组患者的产后出血、胎盘植入、产褥感染、剖宫产情况以及新生儿结局。结果:观察组产后出血、产褥感染、剖宫产发生率明显低于对照组;观察组胎儿窘迫、新生儿窒息发生率明显低于对照组;观察组新生儿体重、Apgar评分明显高于对照组,差异均有统计学意义(P<0.05)。结论:人性化的护理干预能够明显改善前置胎盘期待疗法的临床效果,有效的降低母儿并发症的发生率,是一种行之有效的护理干预方法,值得临床推广应用。%Objective:To discuss the clinical efficacy of humanization nursing in the expectation treatment of placenta previa,and provide guidance for clinical treatment.Method:42 patients of placenta previa from January 2010 to December 2013 were selected in author’s hospital,according to the principle of randomized controlled,the patients were divided into observation group and control group,21 cases in each.The control group was given routine admission nursing, the observation group in the control group received the humanized nursing intervention,two groups were observed in patients with postpartum hemorrhage,placenta accreta,puerperal infection,cesarean section and neonatal outcomes.Result:The observation group the incidence of postpartum hemorrhage,puerperal infection, cesarean section were significantly lower than the control group;the observation group of fetal distress,neonatal asphyxia rate was significantly lower than the control group;the observation group neonatal birth weight,Apgar score was significantly higher than that

  14. 盐酸利托君和硫酸镁应用于前置胎盘治疗中疗效对比%Comparison on effect of ritodrine hydrochloride and magnesium sulfate in the treatment of placenta previa

    Institute of Scientific and Technical Information of China (English)

    王华

    2013-01-01

    目的:对比盐酸利托君和硫酸镁应用于前置胎盘治疗中的临床疗效。方法80例前置胎盘孕妇随机分为盐酸利托君组和硫酸镁组各40例,分别给予静滴盐酸利托君和硫酸镁治疗。对比两组孕妇的保胎效果和不良反应发生情况。结果盐酸利托君组40例孕妇用药后阴道出血停止35例,保胎成功39例,妊娠至足月33例,新生儿平均Apgar评分(8.72±0.78)分;硫酸镁组40例孕妇用药后阴道出血停止26例,保胎成功32例,妊娠至足月24例,新生儿平均Apgar评分(6.87±0.76)分。两组所有指标比较均有统计学差异(P<0.05);两组药物不良反应发生率无明显差异,但不良反应类型不同。结论盐酸利托君应用于前置胎盘治疗能有效抑制宫缩,较之硫酸镁,其止血、保胎作用显著,值得推广应用于临床。%Objective To compare the ritodrine hydrochloride and magnesium sulfate used in the treatment of placenta previa clinical efficacy. Methods 80 cases of placenta previa pregnant women were randomly divided into groups ritodrine hydrochloride and magnesium sulfate groups of 40 patients were treated with intravenous ritodrine hydrochloride and magnesium sulfate therapy. Compared two groups of pregnant women, miscarriage effects and adverse events. Results Ritodrine hydrochloride, 35 cases of pregnant women to stop vaginal bleeding after treatment, 39 cases of miscarriage success, 33 cases of pregnancy to term, neonatal Apgar score average (8.72±0.78) points;magnesium group, 26 cases of vaginal bleeding stopped, 32 cases of miscarriage success, 24 cases of pregnancy to term, neonatal Apgar score average (6.87±0.76) points. All indicators compare the two groups were statistically significant (P<0.05);groups the incidence of adverse drug reactions was no significant difference, but different types of adverse reactions. Conclusion Ritodrine hydrochloride used in the treatment of placenta

  15. To Explore the Clinical Methods of Application Nursing in Puerperal With Placenta Previa%探讨前置胎盘产妇应用护理的临床方法

    Institute of Scientific and Technical Information of China (English)

    宋桂玲

    2016-01-01

    目的:探讨前置胎盘对产妇和临床护理的影响。方法选择40例前置胎盘产妇作为观察组,40例同期时间入院的正常产妇作为对照组,观察产妇不同对新生儿的影响是否不同。结果观察组中的产妇在出血、休克合胎盘植入等发病率高于对照组,差异具有统计学意义(P<0.05)。观察组中的新生儿在窒息、体重低和死亡等新生儿常见症状的发生率高于对照组,差异具有统计学意义(P<0.05)。结论前置胎盘对产妇和婴儿都存在威胁,未进行提前的预防和处理,会增加发病率和死亡率。%Objective To explore the effect of placenta placenta on maternal and clinical nursing.Methods 40 cases of placenta placenta were selected as the observation group, 40 cases of normal women were selected as control group, and the difference of the effect of different maternal.ResultsThe observation group, the incidence of maternal bleeding, shock and placenta were higher than the control group, was difference had statistically singnificance (P<0.05). In terms of production after maternal newborn, observation group in newborns in the common symptoms of neonatal asphyxia, low birth weight and death incidence also was obvious higher than that of the control group, was difference had statistically singnificance (P<0.05). Conclusion Placenta previa on maternal and infant there are very serious threat, if not with placenta previa puerpera to advance prevention and treatment will greatly increased the incidence and mortality of the disease.

  16. 1 case of hemorrhagic shock with placenta previa complicated with placenta implantation into internal ostium of the uterus%前置胎盘伴胎盘植入子宫内口致出血性休克1例

    Institute of Scientific and Technical Information of China (English)

    丁艳春

    2014-01-01

    In this paper,The author explored 1 case of hemorrhagic shock with placenta previa complicated with placenta implantation into internal ostium of the uterus.The patient suffered from hemorrhagic shock after cesarean and uterus resection, because the cause of bleeding was placenta implantation into internal ostium of the uterus inreoperation.So the doctors should check endometrial situation in a cesarean section surgery carefully,find and treat the problem timely so as to avoide secondary operation and patients with life-threatening.%探讨前置胎盘伴胎盘植入子宫内口至出血性休克1例,剖宫产后患者出现失血性休克,再次手术发现出血是胎盘植入子宫内口所引起,故行子宫切除术。告诫临床医生在以剖宫产手术终止妊娠时详细检查子宫内膜情况,发现问题及时处理,以免行二次手术危及患者生命。

  17. Evaluation of different hemostatic methods during caesarean section with pernicious placenta previa ;and placenta accreta%凶险型前置胎盘伴胎盘植入剖宫产术中止血方式评价

    Institute of Scientific and Technical Information of China (English)

    金日男; 钟永红

    2014-01-01

    目的:探讨以子宫下段横行环状压迫缝合术联合子宫下段修补术为主的子宫外压迫止血法在凶险型前置胎盘伴胎盘植入剖宫产术中的止血效果及临床应用价值。方法收集广东省韶关市粤北人民医院自2012年1月至2014年6月收治的46例凶险型前置胎盘患者的临床资料,对胎盘植入发生率、诊断、处理方法及随诊情况进行回顾性分析。结果(1)46例凶险型前置胎盘中并发胎盘植入17例,发生率36.96%;穿透性胎盘植入9例,发生率19.57%。(2)术前彩色多普勒超声诊断胎盘植入7例,诊断率70.00%(7/10);术前行MR检查诊断胎盘植入8例,诊断率为88.89%。(3)保留子宫38例(82.61%),切除子宫8例,子宫切除率17.39%。(4)术后42~61 d随访8例胎盘植入保留子宫患者,均恶露干净、子宫复旧良好。结论彩色多普勒检查和盆腔MR 检查可提高凶险型前置胎盘伴胎盘植入的诊断率;剖宫产术中采用以子宫下段横行环状压迫缝合术联合子宫下段修补术为主的子宫外压迫止血法,可迅速有效地减少剖宫产术中出血量,缩短手术时间,降低子宫切除率。%Objective To evaluate the hemostatic effect of transverse annular compression sutures combined surgical repair in the lower uterine segment and its value on clinical application to control postpartum Hemorrhage at cesarean delivery for pernicious placenta previa with placenta accreta. Methods We conducted a retrospective study at 46 pregnant women with pernicious placenta previa, who were treated at the Affiliated Yuebei People's Hospital of Shantou University Medical College from January 2008 to June 2012. This study reviewed the incidence rates, diagnosis and treatment. Results Among the 46 patients, 17 were diagnosed pernicious placenta praevia with placenta accreta; the incidence rate was 36.5%;while 9 patients were pernicious placenta praevia with placenta

  18. Expression of hypoxia-inducible factor-1α in placental tissues in patients with placenta previa%缺氧诱导因子-1α在前置胎盘患者胎盘组织中的表达及意义

    Institute of Scientific and Technical Information of China (English)

    谢家滨

    2012-01-01

    Objective To study the expression of hypoxia-inducible factor-1 α (HIF-1 α) in patients with placenta previa, and explore the effect in the pathophysiology of placenta previa. Methods The expression of HIF-1 α was detected in patients with placenta previa (group A) and normal pregnant women (group B) by using immunohisto-chemistry. Then the results were compared between the two groups. Results In group A, the positive expression rate of HIF-1α was 73.33% (22/30) and the average optical density was (202.87±18.54), significantly higher than those in group B [23.33% (7/30) and (118.51±10.62)], P<0.01. Conclusion The expression of HIF-la in placental tissues in patients with placenta previa was significantly higher than normal, which could serves as an important indicator for the early diagnosis of placenta previa.%目的 研究缺氧诱导因子-1α(HIF-1α)在前置胎盘患者胎盘组织中的表达,探讨其在前置胎盘发病及病理生理过程中的作用.方法 采用免疫组化法检测并比较前置胎盘患者及正常孕妇的胎盘组织中HIF-1α的表达情况.结果 前置胎盘孕妇组胎盘HIF-1α阳性表达率为73.33%(22/30),光密度值平均为(2 02.87+18.54),均明显高于正常孕妇组水平[HIF-1α阳性表达率为23.33%(7/30),光密度值平均为(118.51±10.62)],差异均具有极显著统计学意义(P<0.01).结论 HIF-1α前置胎盘患者胎盘组织中表达明显升高,有可能成为前置胎盘早期诊断的重要指标.

  19. 产前超声检查在前置胎盘并胎盘植入诊断中的重要性评价%The Importance of Prenatal Ultrasound in Diagnosis of Placenta Previa Pla-centa Implantation and Evaluation

    Institute of Scientific and Technical Information of China (English)

    许崇惠

    2016-01-01

    Objective Evaluate the importance of prenatal ultrasound diagnosis of placenta previa and placenta implanta-tion. Methods Selected in our hospital in August 2013 to 2015 December 202 cases of placenta previa patients as the ob-ject of study, all patients were in production before the color Doppler ultrasound in the diagnosis of, review analysis the pa-tient's imaging characteristics, determine whether complicated with placenta accreta occurred and the pathology result as the basis, to calculate the accuracy of ultrasound in the diagnosis of. Results The 202 patients with placenta previa, by col-or Doppler ultrasound and pathology diagnosis of complicated with placenta accreta patients have 24 cases and 21 cases, detection rate was 11.4%and 10.4%respectively, no significant difference (P> 0.05), the ultrasound misdiagnosis in 3 cas-es, the total detection accuracy rate is 87.5%. Among them, placenta previa and placenta implantation in the anterior wall of the placenta and in the posterior wall of the placenta when diagnosis accurate rate is 94.12% (16 / 17) and 71.43% (5 / 7), placenta previa and placenta implantation in wall placenta diagnostic accuracy is significantly reduced, compared with sta-tistical difference (P0.05),经超声检查,误漏诊3例,总的检出准确率为87.5%。其中,前置胎盘并胎盘植入在前壁胎盘时和在后壁胎盘时的诊断准确率分别为94.12%(16/17)和71.43%(5/7),前置胎盘并胎盘植入在后壁胎盘时的诊断准确率显著降低,比较差异有统计学意义(P<0.05)。前置胎盘并胎盘植入在后壁胎盘时,出现3例产后大出血情况,并发症发生率为42.86%,前置胎盘并胎盘植入在后壁胎盘时,无一例并发症发生。结论产前超声诊断操作简便、重复性好、经济性好、准确率高,是比较理想的前置胎盘并前壁胎盘植入诊断方法。

  20. Influence of placenta previa with placenta accrete on maternal and child outcomes and risk factors analysis%前置胎盘并胎盘植入对母婴结局的影响及危险因素分析

    Institute of Scientific and Technical Information of China (English)

    李洪梅

    2015-01-01

    目的:分析前置胎盘并胎盘植入对母婴结局的影响,并探讨前置胎盘并胎盘植入的危险因素。方法将155例前置胎盘患者依据合并胎盘植入与否分为两组,其中观察组为31例前置胎盘并胎盘植入患者,对照组为124例前置胎盘未合并胎盘植入患者。对两组母婴结局进行统计和分析,并对前置胎盘并胎盘植入的危险因素进行分析。结果观察组产后出血率、子宫切除率分别为58.1%、19.4%,均显著高于对照组的36.8%、4.0%(P=0.034、0.008)。观察组婴儿早产率和新生儿窒息率分别为54.8%、35.5%,显著高于对照组的30.6%、18.5%(P=0.012、0.042)。单因素分析结果显示,不同产次(字2=11.989,P=0.001)、剖宫产史(字2=17.774,P=0.000)、流产史(字2=4.899,P=0.027)、前置胎盘类型(字2=14.270,P=0.001)者,前置胎盘并胎盘植入发生率不同。Logistic回归分析显示,产次(P=0.000、OR=6.942、95%CI院2.483~16.172)、剖宫产史(P=0.000、OR=5.317、95%CI院1.028~10.946)、流产史(P=0.000、OR=16.847、95%CI院4.973~58.348)、前置胎盘类型(P=0.000、OR=10.761、95%CI院3.641~18.034)为前置胎盘并胎盘植入的独立危险因素。结论前置胎盘并胎盘植入可引起产后出血、早产、新生儿窒息,并增大了产妇子宫切除的概率。多产次、多剖宫产史、多流产次、中央性前置胎盘是前置胎盘患者出现胎盘植入的危险因素。%Objective To analyze the influence of placenta previa with placenta accreta on maternal and child out-comes, and investigate the risk factors of placenta accrete. Methods 155 patients with placenta previa were divided in-to two groups according to with or without placenta accrete. 31 patients of placenta previa with placenta accreta were in observation group, and 124 patients of placenta previa without placenta accreta were in control group. Maternal and neonatal outcomes of the two groups were statistically analyzed, and risk factors of

  1. Comprehensive nursing effect in patients with placenta previa treated by expectant treatment%前置胎盘期待疗法患者综合护理体会

    Institute of Scientific and Technical Information of China (English)

    叶红梅

    2015-01-01

    目的:分析综合护理在前置胎盘期待疗法中的应用效果。方法选择2010年1月~2014年12月在陕西省④林市第二医院妇产科住院治疗的55例前置胎盘患者为研究对象,根据入院时间将2010年1月~2012年12月的30例患者作为对照组,2013年1月~2014年12月的25例患者作为观察组。对照组患者给予前置胎盘常规护理,观察组患者在常规护理的基础上给予心理护理、饮食指导、会阴护理等综合护理措施。观察两组患者期待治疗后终止妊娠时间、产后出血量、产褥感染及胎盘植入的发生情况;观察两组新生儿出生后1 min Apgar评分、体重、足月儿、呼吸窘迫综合征及死亡发生情况;比较两组患者的护理满意度。结果积极治疗后,两组患者阴道流血情况均得到有效改善,妊娠时间得到有效延长。观察组终止妊娠时间晚于对照组[(36.9±12.5)比(35.2±10.1)周],产后出血量少于对照组[(381.6±20.2)比(485.3±23.7)mL]、产褥感染及胎盘植入发生率低于对照组(8.00%比26.67%,0.00%比6.67%),差异有统计学意义(P<0.05)。两组患者均适时行剖宫产终止妊娠,观察组新生儿出生后1 min Apgar评分及体重高于对照组[(9.5±1.8)比(8.1±1.3)分,(3.2±0.3)比(2.4±0.9)kg],足月儿比例高于对照组(24.0%比13.3%),新生儿呼吸窘迫综合征及死亡发生率低于对照组(4.0%比20.0%,0.00%比6.67%),差异有统计学意义(P<0.05)。观察组患者护理满意度为92.0%,对照组为70.0%,两组比较差异有统计学意义(P<0.05)。结论前置胎盘期待治疗中实施综合护理可延长孕龄,改善妊娠结局,降低新生儿的死亡率,值得临床推广应用。%Objective To analyze application effect of comprehensive nursing in placenta previa treated with expectant treatment. Methods 55 patients with placenta previa from January 2010 to December 2014 in the Second Hospital of Yulin City in

  2. Influence of different attachment sites of placenta previa on maternal and child outcomes of re-pregnancy after cesarean section%前置胎盘不同附着位置对剖宫产后再次妊娠母婴结局的影响

    Institute of Scientific and Technical Information of China (English)

    刘俊; 谢小琴

    2014-01-01

    目的:探讨前置胎盘不同附着位置对剖宫产后再次妊娠母婴结局的影响。方法回顾性分析本院2011年1月~2013年12月收治的80例剖宫产后再次妊娠合并前置胎盘患者的临床资料,将胎盘附着于前壁的患者分为实验组,附着于后壁的患者为对照组,比较两组患者的一般资料、新生儿情况、妊娠结局和并发症发生情况。结果实验组患者胎盘植入、胎盘粘连、急诊剖宫产、子宫切除、弥散性血管内凝血、产后出血、出血量>1000 ml以及早产发生率均显著高于对照组,差异有统计学意义(P1000 ml and preterm birth of the experimental group were all significantly higher than those of the control group,with statistically significant differences (P<0.05). Conclusion In case of re-preg-nancy concurrent with placenta previa after cesarean section,the pregnancy outcomes of placenta previa attached to an-terior wall are poorer than those of placenta previa attached to posterior wall,and therefore the attachment site should be confirmed in advance in order to improve the pregnancy outcomes.

  3. Propuesta metodológica para mejorar el aprendizaje del tema de electroquímica en estudiantes de 10 grado de la Institución Educativa Cañaveral a través del estudio de sus ideas previas

    OpenAIRE

    Martínez Delgado, John Edison

    2013-01-01

    Este estudio presentado para optar por el título de Magíster en enseñanza de las Ciencias Exactas y Naturales, busca identificar los modelos que los estudiantes poseen para explicar fenómenos de carácter electroquímico a través del estudio de sus ideas previas. Los resultados de este estudio permitirán tener una base sólida para plantear una propuesta metodológica que sirva en futuras intervenciones didácticas, todo enmarcado en una ruta de orientación científica que contribuya al mejoram...

  4. La consulta previa para la explotación de recursos naturales en territorios de los pueblos indígenas en el marco del convenio 169 OIT y su eficacia en los resguardos del gran pueblo de los pastos que habitan en el departamento de Nariño

    OpenAIRE

    Vela Perdomo, Claudia Janneth

    2011-01-01

    El reconocimiento de los derechos de los pueblos indígenas no ha sido un asunto pacífico, sino el resultado de luchas y grandes sacrificios por parte de estas comunidades, en aras de reclamar el respeto de sus condiciones especiales y de la cultura y el territorio que les corresponde. En este marco, la consulta previa es un derecho de especial importancia para estas comunidades y debe originar compromisos ineludibles para el Estado y la sociedad, al tenor de la Constitución de 1991, pues e...

  5. 经腹彩色超声多普勒在前置胎盘并发胎盘植入诊断中的价值%The Value of Diagnosis by Abdominal Ultrasound Applied to Placenta Previa Complicated by Placenta Accreta

    Institute of Scientific and Technical Information of China (English)

    廖明华

    2015-01-01

    目的 探讨经腹彩超应用于前置胎盘并发胎盘植入诊断中的价值.方法 选取我院收治的125例前置胎盘患者作为研究对象,产前对其进行经腹彩色检查,预测是否存在并发胎盘植入,并进行跟踪调查,比较经腹彩超与产后病理诊断结果.结果 最终诊断结果为19例并发胎盘植入,经腹彩超诊断的敏感性为78.9%,特异性为97.6%,阳性和阴性预测值分别为83.3%、96.8%.结论 前置胎盘并发胎盘植入的发生率较高,产前应用经腹彩超对前置胎盘患者进行诊断,具有较高的敏感性和特异性,能够为临床工作提供有预见性的指导.%Objective Abdominal ultrasound is applied to investigate the concurrent placenta previa implantation diagnosis value.Methods Taking 125 cases of placenta previa in our hospital, checked them using transabdominal color before antenatal, predicted the existence of concurrent placenta accreta, and follow-up survey, comparing abdominal ultrasound and postnatal pathology results.Results Final diagnosis were that 19 cases complicated by placenta accreta, transabdominal ultrasound diagnostic sensitivity of 78.9% and a specificity of 97.6%, and positive and negative predictive values were 83.3%、96.8%.Conclusion Complicated by placenta previa implantation higher incidence of antenatal abdominal ultrasound to diagnose patients with placenta previa, with high sensitivity and specificity, to provide anticipatory guidance for clinical work.

  6. Clinical Value of Abdominal Color Doppler Ultrasound in Diagnosis of Placenta Previa Erupt Simultaneously Placenta Implantation%经腹彩色多普勒超声在前置胎盘并发胎盘植入诊断中的临床价值

    Institute of Scientific and Technical Information of China (English)

    梁振停

    2015-01-01

    目的:探讨经腹彩色多普勒超声在前置胎盘并发胎盘植入诊断中的临床价值。方法选取2012年4月~2015年4月在我院接受治疗的前置胎盘合并胎盘植入患者共100例,采用经腹彩色多普勒对所有患者进行检查,分析检查结果。结果经腹彩色多普勒超声诊断后,共诊断为前置胎盘并发胎盘植入的患者共52例,准确率为98.1%,漏诊患者1例,漏诊率为1.9%。结论采用经腹彩色多普勒超声对产妇的前置胎盘并发胎盘植入疾病进行诊断具有良好的临床价值。%Objective To explore the clinical value abdomen of color doppler ultrasound in diagnosis of placenta previa erupt simultaneously placenta implantation. Methods Selected 100 patients with placenta previa erupt simultaneously placenta increta from April 2012 to April 2015 in our hospital, the abdominal color doppler inspection on all of the patients, analyzed the test results. Results After abdominal color doppler ultrasonic diagnosis in diagnosis of placenta previa complicated with placenta implantation in patients with a total of 52 cases, accuracy was 98.1%, the missed diagnosis in patients with a total of 1 case, the missed diagnosis rate was 1.9%. Conclusion Use the color doppler lfow imaging in abdominal maternal placenta previa erupt simultaneously placenta increta disease diagnosis has good clinical value.

  7. Rendimiento académico y especialidad previa de los estudiantes de psicopedagogía del C.E.S. Don Bosco de Madrid = Educational achievement and previous academic background of students of psycho-pedagogy at "Don Bosco" College in Madrid

    OpenAIRE

    Quintanal, J.; García, B.; J.C. Sánchez; Pérez, L.

    2002-01-01

    En la actualidad, la licenciatura en Psicopedagogía está concebida como una carrera de segundo ciclo que viene a completar una titulación de grado medio en alguna especialidad previa relacionada con la educación. El hecho de que ésta última pudiera ser tan diversa nos hizo pensar en la posibilidad de que pudiera existir alguna especialidad de la que procedieran los alumnos con mejores resultados y, de ser así, si esto sugeriría la necesidad de efectuar algún tipo de reajuste en los programas ...

  8. 经腹与经会阴超声、经阴道超声联合诊断前置胎盘的临床效果评价%Clinical Effect Assessment on Abdominal and Perineum Ultrasound,Transvaginal Ultrasound in the Diagnosis of Placenta Previa

    Institute of Scientific and Technical Information of China (English)

    徐娟

    2016-01-01

    目的:评价经腹与经会阴超声、经阴道超声联合诊断前置胎盘的临床效果。方法选取2013年9月~2015年9月我院收治的120例前置胎盘患者作为观察目标,首先120例患者给予经腹、经会阴超声联合检查,并将其作为甲组,然后120例患者接受经腹、经阴道超声联合,并将其作为乙组,比较两组诊断符合率。结果甲组与乙组诊断前置胎盘的诊断符合率分别为95.8%、96.7%,组间比较,差异不存在统计学意义(P>0.05)。结论经腹与经会阴超声、经阴道超声联合对前置胎盘均具有较高的诊断价值,为临床诊断和治疗提供重要的参考信息。%ObjectiveTo evaluate abdominal and perineum ultrasound,transvaginal ultrasound in diagnosis of placenta previa. Methods From September 2013 to September 2015 in our hospital,120 cases of patients with placenta previa as research target. First of al,120 patients were administered with abdomen and perineum ultrasound joint inspection,as a first division,then 120 patients receiving abdominal,transvaginal ultrasound,as a group b,compared two groups of diagnostic coincidence rate.Results The diagnostic accordance rate of the first division and group b in the diagnosis of placenta previa were 95.8%, 96.7%,the comparison between groups, there was no statistical significance difference(P>0.05).Conclusion Abdominal and perineum ultrasound,transvaginal ultrasound diagnosed placenta previa with high value,provide important reference information for clinical diagnosis and treatment.

  9. [Placenta accreta with placenta previa. Case report].

    Science.gov (United States)

    Hernández-Ojeda, Humberto; Torres-Hernández, Rosa María; Rivera-Hernández, Jorge Onasis

    2014-08-01

    The placenta praevia and acretism placental were concurrently and are conditions of abnormal placenta, in which the villus sampling invade the myometrium at the site of implantation and is associated with the partial or complete absence of the decidua. Clinical case: Patient's 32 years of age, with 34 weeks pregnancy. Obstetric history of previous cesarean section, transvaginal bleeding several times; the diagnosis by ultrasound showed placenta praevia occlusive. Surgical treatment was abdominal total hysterectomy.

  10. Multidisciplinary management of invasive placenta previa.

    Science.gov (United States)

    Walker, Melissa G; Allen, Lisa; Windrim, Rory C; Kachura, John; Pollard, Lindsay; Pantazi, Sophia; Keating, Sarah; Carvalho, Jose C A; Kingdom, John C P

    2013-05-01

    Objectif : Évaluer l’efficacité d’une approche d’équipe multidisciplinaire visant l’atténuation de la morbidité maternelle grave chez les femmes qui présentent un placenta prævia invasif. Méthodes : Nous avons mené une étude prospective auprès de 33 femmes qui présentaient un placenta prævia et increta-percreta (diagnostiqué par échographie et/ou imagerie par résonance magnétique) et qui accouchaient au Mount Sinai Hospital de Toronto, à la suite du lancement (en janvier 2008) d’une approche d’équipe visant les femmes qui présentaient une telle placentation. Nous avons inclus les accouchements chez les femmes visées jusqu’en juin 2012. Nous avons analysé les dossiers prénataux (services externes et services hospitaliers) en vue d’y repérer l’utilisation par l’obstétricien titulaire de six composantes d’équipe prédéfinies : (1) consultation prénatale en médecine fœto-maternelle; (2) consultation en chirurgie gynécologique; (3) IRM prénatale; (4) consultation en radiologie interventionnelle et mise en place préopératoire de sondes à ballonnet dans les divisions antérieures des artères iliaques internes; (5) planification à l’avance de la date de chirurgie; et (6) chirurgie menée par des membres de l’équipe chirurgicale vouée aux cas de placenta invasif. Les détails de l’évolution prénatale, de l’accouchement et de la période postpartum ont été consignés afin d’établir un score composite de morbidité maternelle grave en cinq points fondé sur la présence ou l’absence de ce qui suit : (1) admission à l’USI à la suite de l’accouchement; (2) transfusion de plus de deux unités de sang; (3) anesthésie générale (administration ou conversion); (4) temps opératoire se situant dans le quartile le plus élevé (> 125 minutes); et (5) complications postopératoires significatives (réhospitalisation, hospitalisation postpartum prolongée et/ou embolie pulmonaire). Résultats : Les 33 participantes ont survécu au cours de cette période. Les deux tiers (22/33) d’entre elles présentaient cinq ou six des six composantes des soins multidisciplinaires. L’utilisation croissante des composantes des soins multidisciplinaires a été associée à une baisse significative de la morbidité composite (R2 = 0,228, P = 0,005). Conclusion : L’évaluation et la prise en charge en équipe des femmes qui présentent un placenta prævia invasif sont susceptibles d’améliorer les issues maternelles et devraient être favorisées sur une base régionale.

  11. Analysis on maternal and fetal outcomes in 73 cases re-pregnant women with cesarean scar uterus complicating placenta previa%瘢痕子宫再次妊娠并发前置胎盘73例母婴结局分析

    Institute of Scientific and Technical Information of China (English)

    马红柳; 罗欣; 漆洪波; 彭方亮

    2016-01-01

    Objective To explore the maternal and fetal perioperative outcomes of re-pregnant women with cesarean scar uterus complicating placenta previa and its influential factors. Methods Seventy-three cases of cesarean scar uterus complicat-ing placenta previa delivered in the First Affiliated Hospital of Chongqing Medical University from January 2014 to December 2015 were retrospectively analyzed. The maternal general condition ,intraoperative situation as well as maternal and fetal outcome were compared. Seventy-three pregnant women were grouped according to whether complicating dangerous placenta previa occur-rence and whether previous pregnancy being elective cesarean section. Results (1)The probability of complicating dangerous placenta previa in re-pregnancy women with previous elective cesarean section was higher than that in re-preganat women with ce-sarean section after vaginal trial labor failure,the difference was statistically significant[40.00%(18/45) vs. 28.57%(8/28),P<0.01]. (2)The occurrence rates of placenta implantation,postpartum hemorrhage,hysterectomy,DIC,blood transfusion and poor neona-tal outcomes in the pregnant women with complicating dangerous placenta previa were significantly higher than those in the preg-nant women with non-dangerous placenta previa,the difference was statistically significant(P<0.05). Conclusion Re-pregnant women with cesarean scar uterus are easier to develop placenta previa;re-pregnancy women with previous elective cesarean sec-tion have the high occurrence rates of complicating dangerous placenta previa and poor maternal and neonatal outcomes;strictly mastering the indication of first cesarean section is the key to reduce the poor maternal and neonatal outcomes of re-pregnancy.%目的:探讨前次剖宫产后瘢痕子宫再次妊娠并发前置胎盘的母婴围生期结局及其影响因素。方法回顾性分析2014年1月至2015年12月于重庆医科大学附属第一医院住院分娩的瘢痕子宫(前次剖

  12. 凶险型前置胎盘并发胎盘植入的临床特点及高危因素探讨%Objective to Investigate the Clinical Characteristics and Risk Factors of Placenta Previa Complicated with Placenta Accreta

    Institute of Scientific and Technical Information of China (English)

    黎春梅

    2016-01-01

    ABSTRACT:Objective: to analyze and discuss the clinical characteristics and risk factors of placenta previa complicated with placenta accreta. Methods: 150 cases of maternal discussed in this study were randomly selected in our hospital in January 2015 to 2016 during March were dangerous placenta previa, of which 75 cases of maternal pernicious placenta previa complicated with placenta accreta, divided into study group, 75 cases in other single dangerous placenta previa, divided into control group, comparative analysis clinical status by the women in the two groups.Results: study group with respect to age more than or equal to 35 years old, abortion is more than or equal to 2 times, section from the number is more than or equal to twice the number of mothers were than the control group, the group of data with statistical significance (P< 0.05). The rate of hysterectomy, blood transfusion and blood loss in the study group were higher than those in the control group, and the data were statistically significant (P<0.05).Conclusions: maternal age, cesarean section labor, abortion status are high risk factors of placenta previa complicated with placenta accreta, maternal pregnancy, the placenta mainly in the anterior wall of the uterus position, which belongs to the central type.%目的:分析讨论凶险型前置胎盘并发胎盘植入的临床特点和高危因素。方法:此研究中所讨论的150例产妇均随机选取于我院2015年1月至2016年3月期间所收治的凶险型前置胎盘产妇内,其中有75例产妇为凶险型前置胎盘并发胎盘植入,将其划分为研究组,另75例为单一性凶险型前置胎盘产妇,将其划分为对照组,对比分析两组产妇各临床状况。结果:研究组年龄≥35岁、流产次数≥2次、剖宫产次数≥2次的产妇数量均比对照组要高,组间数据有统计学意义(P<0.05)。研究组子宫切除率、术中输血率和术中出血量等均高于对照组,组间

  13. Clinical Evaluation of Transvaginal and Transabdominal Ultrasound in Diagnosing Pernicious Placenta Previa with ROC Curve%ROC 曲线对经阴道及经腹超声诊断凶险型前置胎盘的临床评价

    Institute of Scientific and Technical Information of China (English)

    苗德萍; 王双

    2014-01-01

    Objective To explore the value of transvaginal ultrasound in diagnosing pernicious placenta previa. In order to raise the diagnostic accuracy of pernicious placenta previa and placenta accreta. Methods All of the 67 cases, which had the history of cesarean section and the placenta in the palace wall, treated by transabdominal ultrasonography,and then treated by transvaginal ultrasonography . Recorded two sets of data ,one was the relations between the placenta and the lower uterine seg-mentcervical internal , another was the relations between the placenta and uterine musclewall. Tracking operation diagnosis and pathologic diagnosis. Result In 67 patients ,33 cases of postoperative diagnosis of pernicious placenta previa,8 cases complicated with placenta accreta . The areas under ROC curve of transvaginal ultrasound and transabdominal ultrasound in diagnosing perni-cious placenta previa were 0. 985 vs 0. 793;The areas under ROC curve of transvaginal ultrasound and transabdominal ultrasound in diagnosing placenta accreta were 0. 867 vs 0. 787. There was significant differnce between transvaginal ultrasound and transabdo-mial ultrasound (P < 0. 05). Conclusion Transvaginal ultrasound could increase the diagnostic accuracy of pernicious placenta previa and placenta accreta.%目的:探讨经阴道超声对诊断凶险型前置胎盘的临床诊断价值,提高诊断凶险型前置胎盘及胎盘植入的准确性。方法对67例既往有剖宫产史,胎盘位于宫前壁患者先行经腹超声检查,再行经阴道超声检查,分别记录胎盘与子宫下段宫颈内口关系及胎盘与子宫肌壁关系两组数据。追踪手术及病理诊断结果。结果67例患者中33例术后诊断为凶险型前置胎盘,8例伴胎盘植入。 ROC 分析经阴道及经腹超声诊断凶险型前置胎盘的曲线下面积分别为0.985、0.793;经阴道及经腹超声诊断胎盘植入的曲线下面积分别为0.867、0.787。两种方法的 ROC 曲线及曲线下

  14. Analysis on the Application Value of Transabdominal Color Doppler Ultrasound in Diagnosis of Placenta Previa Complicated with Placenta Accreta%经腹彩超在前置胎盘并发胎盘植入诊断中的应用价值分析

    Institute of Scientific and Technical Information of China (English)

    唐敦艳; 贺瑾

    2016-01-01

    Objective To analyze the application value of transabdominal color Doppler ultrasound in diagnosis of placenta previa complicated with placenta accreta. Methods 212 pregnant women with placenta praevia treated in our hospital from January 2011 to September 2015 were selected and given transabdominal color Doppler ultrasound examination. With the reference of surgical and pathological results, the accuracy, sensitivity, specificity, positive predictive value and negative predictive value of transabdominal color Doppler ultrasound were calculated, and the causes were analyzed. Results Of 212 cases of placenta previa patients, the images of abdominal ultrasound in 23 cases showed placenta accreta: 18 cases were confirmed by surgical and pathological examination, 5 cases showed false positive;189 cases were not detected with placenta accreta by abdominal ultrasound, and 4 cases among these patients were confirmed with placenta accreta by surgical and pathological examination. The sensitivity, specificity, positive predictive value, negative predictive value and accuracy of abdominal ultrasound in diagnosis of placenta previa complicated with placenta accreta were 81.8%, 97.4%, 78.3%, 97.9%and 95.8%respectively. Conclusions Transabdominal color Doppler ultrasound has important application value in diagnosis of placenta previa complicated with placenta accrete. When patients exist risk factors of placenta previa complicated with placenta accreta, ultrasound examination should be paid special attention in order to improve the diagnostic accuracy.%目的:分析经腹彩超在前置胎盘并发胎盘植入诊断中的应用价值。方法以我院2011年1月至2015年9月收治的212例发生前置胎盘的孕妇为研究对象,对其进行经腹彩超检查。以手术及病理检查结果作为参照,计算经腹彩超的准确度、灵敏度、特异度、阳性预测值及阴性预测值,并分析其原因。结果212例前置胎盘患者中,23例经腹彩超

  15. Nursing Intervention to Prolong the Gestational Week of Placenta Previa Efficacy and Effectiveness%护理干预对延长前置胎盘妊娠孕周的效果观察与成效

    Institute of Scientific and Technical Information of China (English)

    李洁凤; 裴金兰; 罗红仪

    2013-01-01

    signiifcant difference.Conclusion To provide high-quality care interventions can reduce the psychological anxiety of pregnant women with placenta previa, prolong the pregnancy for gestational age, and effectively improve perinatal survival rate.

  16. Influência do internamento materno prolongado nos resultados maternos e perinatais de duas séries de pacientes com placenta prévia Influence of prolonged maternal stay in maternal and perinatal outcomes of two series of patients with placenta previa

    Directory of Open Access Journals (Sweden)

    Carlos Augusto Alencar Júnior

    2012-01-01

    Full Text Available OBJETIVO: Comparar os resultados maternos e perinatais de pacientes portadoras de placenta prévia, após adoção do internamento materno prolongado, com os de uma série histórica ocorrida em 1991. MÉTODOS: Estudo retrospectivo comparando 108 casos da doença - em pacientes hospitalizadas em uma instituição de ensino do estado do Ceará, nordeste do Brasil, no período de primeiro de janeiro de 2006 a 31 de dezembro de 2010 - com 101 casos ocorridos em 1991, na mesma instituição. Os seguintes dados maternos e perinatais foram coletados: idade materna, paridade, idade gestacional no momento do parto, via de parto, tempo de internamento materno, escores de Apgar ao primeiro e quinto minutos, peso ao nascimento, adequação do peso ao nascer, tempo de hospitalização neonatal, morbidade materna e neonatal e mortalidades (materna, fetal, neonatal e perinatal. As variáveis categóricas foram analisadas utilizando-se os testes do χ² de associação e exato de Fischer. Os resultados foram considerados significativos quando pPURPOSE: To compare the maternal and perinatal outcomes of patients with placenta previa, after the adoption of a prolonged maternal hospital stay, to those of a 1991 series. METHODS: We performed a retrospective study comparing 108 cases of placenta previa hospitalized in the Maternity School Assis Chateaubriand, Universidade Federal do Ceará, during the period from 01/01/2006 to 12/31/2010, with those obtained in 1991, when 101 cases of the pathology were observed at our institution. The following maternal and perinatal data were collected: maternal age, parity, gestational age at delivery, mode of delivery, maternal stay length, Apgar scores at the 1st and 5th minutes, birth weight, adequacy of birth weight, neonatal length stay, maternal and neonatal morbidity and mortality rates (maternal, fetal, neonatal and perinatal. Statistical analysis was performed using the χ² and Fisher's exact tests. The results were

  17. Cuerpos extraños introducidos yatrogénicamente en los tejidos bucales durante tratamientos odontológicos. A proposito de 9 casos

    OpenAIRE

    Faura Solé, Marc; Sánchez Garcés, Ma. Ángeles; Berini Aytés, Leonardo; Gay Escoda, Cosme

    2000-01-01

    Se presentan nueve pacientes con sendos cuerpos extraños en los maxilares y tejidos adyacentes cuyo origen fue un tratamiento odontológico. Los tres primeros cuerpos extraños correspondían a puntas de botadores rectos empleados en extracciones dentarias previas. Un condensador de gutapercha, una fresa de Lindemann, restos de amalgama así como dos casos de agujas anestésicas rotas, fueron los otros objetos hallados. Asimismo se muestra el caso de un paciente en el cual la radiografía mostraba ...

  18. 介入技术在完全性前置胎盘和胎盘植入中的临床应用价值%Clinical Value of Interventional Radiologic Technique Combined with Cesarean Delivery in Placenta Previa and Placenta Accrete Patients

    Institute of Scientific and Technical Information of China (English)

    谢娅; 张颖; 彭铮

    2014-01-01

    Objective:To investigate the clinical value of interventional radiologic technique combined with cesarean delivery. Method:40 consecutive patients in our hospital with complete placenta previa or suspected placenta accrete were prospectively assessed from June 2011 to December 2013. 20 cases were treated by traditional cesarean delivery methods, termination of pregnancy as the control group. 20 patients were treated by obstetric joint intervention carried out new DSA in the operating room for abdominal aortic balloon placed+cesarean delivery+the iliac artery and uterine artery embolization, as the DSA group,the different outcomes of the two groups were compared. Result:There were no statistical significance in the neonatal Apgar scores of the two groups(P>0.05);intraoperative and postpartum blood loss,blood transfusion amount in the DSA group were significantly lower than the control group,the differences had statistical significance(P0.05);DSA组术中及产后失血量、输血量均明显低于对照组,差异均有统计学意义(P<0.05);DSA组子宫切除率显著低于对照组,母乳喂养率显著高于对照组,差异均有统计学意义(P<0.05)。结论:剖宫产术中腹主动脉放置球囊联合术后髂内动脉子宫动脉栓塞技术能够显著降低产时产后出血量、输血量、子宫切除率,并提高母乳喂养率。

  19. Application value and timing of bloom occlusion in perioperative phase of pernicious placenta previa%球囊介入动脉闭塞术在凶险型前置胎盘围术期中的应用价值及时机

    Institute of Scientific and Technical Information of China (English)

    黄金瑞; 李敏清

    2015-01-01

    目的:探讨球囊介入动脉闭塞术在凶险型前置胎盘合并胎盘植入围术期中的应用价值及时机。方法回顾性分析2010年1月~2014年12月广西医科大学附属南宁市第一人民医院45例凶险型前置胎盘合并胎盘植入产妇的临床资料,其中24例在膀胱镜检查+双侧输尿管逆行插管术+球囊介入髂总动脉闭塞术下施行二次剖宫产术(介入组),21例直接行二次剖宫产术(对照组)。比较两组的术中出血量、输血量、产后出血率、子宫切除发生率、并发症发生率、围生儿情况及住院费用等。结果介入组术中出血量[(1596.08±156.25)mL]、输血量[浓缩红细胞:(4.42±2.10)U],血浆:(534.34±36.12)mL]、产后出血率(29.17%)均明显低于对照组[(2296.08±184.38)mL、(7.27±2.05)U、(1164.10±75.26)mL、47.62%],差异均有统计学意义(P0.05)。结论凶险型前置胎盘合并胎盘植入在球囊介入动脉闭塞术下行剖宫产术,具有有效、安全、创伤小等优点,是一种新型有效的治疗措施。%Objective To explore the application value and operation time of interventional therapy in perioperative phase of pernicious placenta previa with placenta implantation. Methods The clinical data of 45 cases of pernicious placenta previa with placenta implantation from January 2010 to December 2014 in the First People's Hospital of Nan-ning City, Guangxi Medical University, were retrospectively analyzed. 24 patients were given cesarean section using cystoscopy and retrograde catheterization and arterial embolization (intervention group), and another 21 patients were given traditional cesarean section (control group). The comparisons of intraoperative bleeding volume, transfused blood volume,womb excision incidence rate, postpartum hemorrhage rate, complication incidence rate, hospitalized cost, ges-tational age and neonatal asphyxia rate between the two groups were done. Results Compared to the control group, the research

  20. Reforma Tributaria en Argentina: Algunas necesarias definiciones previas

    Directory of Open Access Journals (Sweden)

    Ricardo Bara

    2015-09-01

    Full Text Available Hay aceptación general que nuestro actual “sistema” tributario tiene inconvenientes graves. Pero también hay diferencias notorias respecto cuáles son las reformas aconsejables. Para ordenar el tratamiento del tema se exponen los criterios normativos básicos en los que se apoya cualquier propuesta de un sistema tributario aconsejable, derivados de la literatura académica sobre Hacienda Pública y la experiencia práctica de otras naciones. Las relaciones fiscales son una parte de las normas, derechos y facultades de cada uno de los sectores, establecidas en el sistema institucional que define la Constitución Nacional. Los recientes avances de la economía política y de la economía institucional han producido resultados importantes para la comprensión de las interrelaciones en los sistemas económicos e institucionales y ellos son aplicables a los sistemas tributarios. El trabajo procura incorporar estos nuevos aportes para derivar los criterios normativos. Por otra parte, una reforma tributaria es un fenómeno complejo. Se trata de un cambio sobre un sistema ya existente que debe “seguir funcionando” con importantes efectos en la transición. Una reforma tributaria es un cambio institucional significativamente importante. Esto aconseja definir cuestiones como el sistema económico-político donde se va aplicar la reforma y el orden institucional que va reglar las relaciones entre el ciudadano-contribuyente y el fisco, el alcance del uso del poder, la relación entre reglas y discrecionalidad.

  1. Consideraciones previas al estudio de los marcos relacionales

    Directory of Open Access Journals (Sweden)

    Aldo Hernández

    2005-01-01

    Full Text Available El propósito de este artículo es señalar algunos aspectos cruciales del análisis del comportamiento en el abordaje de la conducta compleja humana. En primera instancia se revisan algunos supuestos referidos a cómo se concibe el conocimiento científico en análisis del comportamiento, posteriormente se desarrollan algunas ideas referidas a lo que se entiende por comportamiento y finalmente el tipo de conceptualización que es apropiada para describir su dinámica

  2. Effectiveness of disinfection with alcohol 70% (w/v of contaminated surfaces not previously cleaned Eficacia de la desinfección con alcohol al 70% (p/v de superficies contaminadas sin limpieza previa Eficácia da desinfecção com álcool 70% (p/v de superfícies contaminadas sem limpeza prévia

    Directory of Open Access Journals (Sweden)

    Maurício Uchikawa Graziano

    2013-04-01

    Full Text Available OBJECTIVE: To evaluate the disinfectant effectiveness of alcohol 70% (w/v using friction, without previous cleaning, on work surfaces, as a concurrent disinfecting procedure in Health Services. METHOD: An experimental, randomized and single-blinded laboratory study was undertaken. The samples were enamelled surfaces, intentionally contaminated with Serratia marcescens microorganisms ATCC 14756 106 CFU/mL with 10% of human saliva added, and were submitted to the procedure of disinfection WITHOUT previous cleaning. The results were compared to disinfection preceded by cleaning. RESULTS: There was a reduction of six logarithms of the initial microbial population, equal in the groups WITH and WITHOUT previous cleaning (p=0.440 and a residual microbial load ≤ 102 CFU. CONCLUSION: The research demonstrated the acceptability of the practice evaluated, bringing an important response to the area of health, in particular to Nursing, which most undertakes procedures of concurrent cleaning /disinfecting of these work surfaces. OBJETIVO: Evaluar la eficacia desinfectante de alcohol al 70% (p/v por fricción, sin limpieza previa, en las superficies de trabajo, como procedimiento de desinfección cotidiana o de rutina en Servicios de Salud. MÉTODO: Fue desarrollado un estudio experimental de laboratorio, aleatorio y uni-ciego. Las muestras fueron obtenidas de superficies esmaltadas, intencionalmente contaminadas con microorganismos Serratia marcescens ATCC 14756 106 UFC/mL acrecido con 10% de saliva humana, sometidas al procedimiento de desinfección SIN limpieza previa. Los resultados fueron comparados a la desinfección después de limpieza. RESULTADOS: Hubo una reducción de seis logaritmos de la población microbiana inicial, igualmente en los grupos COM y SIN limpieza previa (p=0,440 y una carga microbiana residual ≤ 102 UFC. CONCLUSIÓN: La investigación demostró que es aceptable la práctica evaluada ofreciendo así una importante respuesta para

  3. Solvent. I. Extraction systems applied to uranium analysis. I. Extraction studies with Tributyl phosphate-Methyl-isobutyl-ketone; Metodos de extraccion don disolventes aplicados al analisis quimico del uranio. I. Estudio de la extraccion con fosfato de tributilo-metilisobutilcetano

    Energy Technology Data Exchange (ETDEWEB)

    Vera Palomino, J.; Palomares Delgado, F.; Petrement Eguiluz, J. C.

    1964-07-01

    A factorial study of the selective extraction of uranium with a mixture of TBP-MIC was carried out using 0,8 N nitric acid and different salting agents. We use the most suitable salting agent to develop new factorial experiments in order to get an equation involving the percent of extracted uranium, E, the concentration of the extraction agent in the organic phase, c, and the concentration of the slating agent in the aqueous phase, n. (Author) 3 refs.

  4. Solvent-extraction methods applied to the chemical analysis of uranium. III. Study of the extraction with inert solvents; Metodos de extraccion con disolventes aplicados al analisis quimico del uranio. III. Estudio de la extraccion con disolvente inertes

    Energy Technology Data Exchange (ETDEWEB)

    Vera Palomino, J.; Palomares Delgado, F.; Petrement Eguiluz, J. C.

    1964-07-01

    The extraction of uranium on the trace level is studied by using tributylphosphate as active agent under conditions aiming the attainment of quantitative extraction by means of a single step process using a number of salting-out agents and keeping inside the general lines as reported in two precedent papers. Two inert solvents were investigated, benzene and cyclohexane, which allowed to derive the corresponding empirical equations describing the extraction process and the results obtained were compared with those previously reported for solvents which, like ethyl acetate and methylisobuthylketone, favour to a more or less extend the extraction of uranium. (Author) 4 refs.

  5. Preparation of extraction resin for radio lanthanides separation; Preparacion de resina de extraccion para separacion de radiolantanidos

    Energy Technology Data Exchange (ETDEWEB)

    Cruz B, C.C. de la; Monroy G, F. [ININ, 52750 La Marquesa, Estado de Mexico (Mexico)]. e-mail: delacruzbc@hotmail.com

    2008-07-01

    The present work presents the methodology that was developed for the preparation of one extractant resin with the aim of HDEHP, to separate radio lanthanides with serial atomic numbers. In this case it is exemplified with the separation of the following elements: Gadolinium-161 and the Terbium-161; this last radioisotope it is a beta emitting ({beta}{sup -}) that has a great potential to be used in therapy, also in nuclear medicine and in oncology, this is due to the high penetration power of their {beta}{sup -} particles that can kill to the cancerous cells and to inhibit the growth of the same ones. To be able to separate them it is necessary to appeal to extremely selective separation techniques, since the chemical properties of these elements are very similar. The chromatography is one of the more used analytical tools, this is due to its great sensibility and the selectivity in the compounds separation, in particular the use of the extractive chromatography has shown the feasibility of carrying out this type of separations for this type of elements. The resin with base of HDEHP was absorbed in an inert support under diverse preparation conditions. The extractant properties of the resin, in relation to the elements Gd and Tb (distribution coefficients), its were determined by means of the dynamic method, using as eluent solutions of nitric acid. The Gd-159 was prepared by irradiation of Gd-168 with thermal neutrons and the Tb-161 it is the result of the radioactive decay of the Gd-161 that is produced in turn with the irradiation with neutrons of Gd-160. The coefficients of distribution of Gd and Tb, using the prepared resin under diverse conditions are presented. (Author)

  6. Desarrollo de la ingenieria basica de una planta industrial para extraccion con CO2 liquido. I. Extractores

    Directory of Open Access Journals (Sweden)

    GOLDENBERG Julio Fernando

    1998-01-01

    Full Text Available En base a los resultados obtenidos en una unidad piloto cuyo diseño, montaje y puesta en operación fueron realizados con la finalidad de poder producir el cambio de escala, se dio inicio al proyecto de una planta de producción con características modulares por su flexibilidad operativa en cuanto a capacidad de producción y tipo de materia prima. Se desarrolló la ingeniería conceptual, consistente en la definición de las bases de diseño; las diferentes etapas del proceso, la capacidad de producción a instalar, los rangos de trabajo de las variables operativas, el régimen, la especificación de los materiales de construcción, características de la carga, materiales auxiliares y tipo de instrumentación y control. La ingeniería básica, especificación de equipos y componentes auxiliares, para: alimentación de CO2, bombeo y presurización, acondicionamiento térmico, extracción, separación fluido/extracto, medida y control del caudal, temperatura y presión, se encuentra en una etapa avanzada de ejecución. Se ha comenzado con la ingeniería de detalle de extractores con diferente capacidad.

  7. Extracción mediante un SOXTEC® de la materia grasa de algodones procedentes de diferentes áreas productoras. Comparación extracción con diclorometano o sucesivas diclorometano-metanol.

    Directory of Open Access Journals (Sweden)

    Martínez, Mª J.

    1997-08-01

    Full Text Available The paper compares the fatty matter recovered from cotton when applying one extraction with dichloromethane or two successive extractions (the first with dichloromethane and the second one with methanol, more polar and the time required for the operation when using SOXTEC® System HT2 or the usual Soxhlet. Results showed that it is convenient to make successive extractions of 1 hr and 30 minutes, respectively, with SOXTEC®. The fatty matter extracted was homogeneous, with independence of its origin. Before the analysis of pesticides, samples should be purified by gas chromatography (ECD or MS.

    El trabajo compara la recuperación de materia grasa de algodón con una única extracción con diclorometano o dos extracciones consecutivas (la primera con diclorometano y la segunda con metanol, más polar y el tiempo necesario para la operación utilizando SOXTEC® System HT2 y el Soxhlet convencional. El resultado indica que deben hacerse dos extracciones sucesivas de una hora y 30 minutos, respectivamente, en SOXTEX®. Ello representa una considerable reducción con respecto al Soxhlet. La grasa extraída es relativamente homogénea, con independencia del origen de la materia prima. Antes del análisis de los pesticidas, la muestra debe someterse a una purificación previa mediante cromatografía gaseosa (ECD ó MS.

  8. Características demográficas y exposiciones ambientales previas al diagnóstico de leucemia linfoide aguda en pacientes pediátricos / Demographic Characteristics and Environmental Exposure Previous to Acute Lymphoid Leukemia Diagnosis in Pediatric Patients / Características demográficas e exposições ambientais anteriores ao diagnóstico de leucemia linfoblástica aguda em pacientes pediátricos

    Directory of Open Access Journals (Sweden)

    Miguel Ángel Castro-Jiménez, MSc.

    2015-07-01

    Full Text Available Introducción: La leucemia linfoide aguda (LLA es la enfermedad maligna más frecuente durante la niñez. Aunque sus causas no son claras, algunos factores demográficos y ambientales podrían estar jugando algún papel en su origen. Objetivo: Identificar los factores demográficos y ambientales a los que estaban expuestos pacientes con LLA pediátrica antes de su diagnóstico. Metodología: Estudio descriptivo basado en el grupo de casos de un estudio de casos y controles dirigido a determinar los factores de riesgo para LLA. Los casos fueron pacientes menores de 15 años diagnosticados con LLA entre enero de 2000 y marzo de 2005 que consultaron a instituciones de Bucaramanga y Bogotá (Colombia. La información detallada de exposiciones demográficas y ambientales de las viviendas fue recolectada por encuestadores entrenados usando entrevistas estructuradas. Ambos progenitores fueron entrevistados. Los valores p de 0.05 o menores fueron significativos. Resultados: En este análisis 99 casos fueron incluidos. La edad media al diagnóstico fue de 6.6 años para niños y 5.7 para niñas. La edad mediana materna fue de 26 años y la paterna de 30. El 67.7% de los pacientes vivían en nivel socioeconómico bajo antes de diagnóstico. Los químicos usados o almacenados más frecuentemente en la vivienda de estos pacientes fueron: petróleo, gasolina, queroseno y diluyente (n = 19, 19.2% e insecticidas (n=18; 18.2%. Conclusiones: Este estudio mostró que los pacientes pudieron estar en contacto cercano con exposiciones potencialmente carcinogénicas previa al diagnóstico. [Miguel Angel Castro-Jiménez MA, Valdelamar-Jiménez A. Características demográficas y exposiciones ambientales previas al diagnóstico de leucemia linfoide aguda en pacientes pediátricos. MedUNAB 2015; 18 (1: 66-70]. Introduction: Acute lymphoblastic leukemia is the most common pediatric malignant disease. Its causes are mostly unknown but some demographic and environmental

  9. Antioxidants from grape seed using supercritical carbon dioxide; Obtencion de antioxidantes a partir de pepitas de uva mediante extraccion con fluidas superciriticas, SFE

    Energy Technology Data Exchange (ETDEWEB)

    Acilu, M.; Berganza, J.; Brettes, P.

    2003-07-01

    The wine-producing industry produces large amount of solid waste annually. Grape seeds represent a large percentage of this solid waste, the production of vegetable oil and energy being the more usual added value. As it is known, grape seeds contain huge amounts of phenolic compounds and have been highly researched owing to their antoxidant properties. The aim of this article is to present the extraction results of these compounds from grape seeds using supercritical carbon dioxide. Before doing the final experiments in the pilot plant of supercritical fluids, the following variables were evaluated using analytical equipment: time extraction, pressure, temperature, amount, nature and method used for adding the modifiers, as well as pre-treatment and amount of raw material. The results showed that the recovery of phenolic compounds from real materials is lower than the recovery obtained with the standards, and that maximum extraction is achieved with monomeric compounds, mainly with epichatechin. (Author)

  10. Actividad antioxidante de residuos del aguacate Hass (Persea americana Mill. var Hass) sometidos a extracciones clásicas y a fluidos presurizados

    OpenAIRE

    Polania Barreto, Wilson

    2014-01-01

    El presente trabajo exploró la posibilidad de obtener extractos, a partir de semillas y epicarpio de aguacate Hass (Persea americana Mill. var. Hass), capaces de proteger la oleína de palma (OP) y la carne de res cruda (CR) de la oxidación lipídica; se empleó extracción soxhlet (E.Sox.) a presión reducida (Pred) usando tanto de forma directa como sucesiva hexano, acetato de etilo y etanol. En el caso de la oleína, con el extracto más activo se realizó un ensayo acelerado de oxi...

  11. The influence of leachates on the extraction of biogas in solid refuse tips; Lixiviados en los vertederos de residuos solidos, su incidencia en la extraccion de biogas

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1999-08-01

    The presence of leachates not far below the surface in solid refuse tips interferes with biogas generation irrespective of the recovery system employed (vertical or horizontal collectors). Biogas management can be optimised by monitoring the level of leachates, which tem have to be eliminated. The results are given of analytical tests on leachates in urban, urban/industrial and industrial waste dumps. Finally, the system used at the Can Mata dump, in which the leachate is pumped out, is described, Controlling the amount extracted has made it possible to optimise the biogas recovery facility and obtain the best energy performance. (Author)

  12. Characterization and extraction of gold contained in foundry industrial wastes; Caracterizacion y extraccion de oro contenido en matrices de desechos industriales de fundicion

    Energy Technology Data Exchange (ETDEWEB)

    Vite T, J.; Vite T, M.; Diaz C, A.; Carreno de Leon, C. [Instituto Nacional de Investigaciones Nucleares, Depto. de Estudios del Ambiente, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    1999-07-01

    Gold was characterized and leached in foundry sands. These wastes are product among others of the automotive industry where they are used as molds material which are contaminated by diverse metals during the foundry. To fulfil the leaching process four coupled thermostat columns were used. To characterize the solid it was used the X-ray diffraction technique. For the qualitative analysis it was used the Activation analysis technique. Finally, for the study of liquors was used the Plasma diffraction spectroscopy (Icp-As) technique. The obtained results show that the process which was used the thermostat columns was more efficient, than the methods traditionally recommended. (Author)

  13. Study of transient rod extraction failure without RBM in a BWR; Estudio del transitorio error de extraccion de barra sin RBM en un BWR

    Energy Technology Data Exchange (ETDEWEB)

    Vallejo Q, J. A.; Martin del Campo M, C.; Fuentes M, L.; Francois L, J. L., E-mail: amhed_jvq@hotmail.com [UNAM, Facultad de Ingenieria, Departamento de Sistemas Energeticos, Ciudad Universitaria, 04510 Ciudad de Mexico (Mexico)

    2015-09-15

    The study and analysis of the operational transients are important for predicting the behavior of a system to short-term events and the impact that would cause this transient. For the nuclear industry these studies are indispensable due to economic, environmental and social impacts that could cause an accident during the operation of a nuclear reactor. In this paper the preparation, simulation and analysis results of the transient rod extraction failure in which not taken into operation the RBM is presented. The study was conducted for a BWR of 2027 MWt, in an intermediate cycle of its useful life and using the computer code Simulate-3K a scenario of anomalies was created in the core reactivity which gave a coherent prediction to the type of presented event. (Author)

  14. The extraction system: Eu{sup 3+}-water-NaCl-HDBM-Benzene; El sistema de extraccion: Eu{sup 3+}-agua-NaCl-HDBM-Benceno

    Energy Technology Data Exchange (ETDEWEB)

    Jimenez R, M.; Solache R, M.; Rojas H, A. [Instituto Nacional de Investigaciones Nucleares, Departamento de Quimica, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    1998-07-01

    It was studied the behavior as in acid as alkaline media of the extraction system with dissolvant integrated by trivalent europium in a 2a sodium chloride media and dibenzoylmethane (HDBM) in benzene at 303 K. It was established: the time in which the balance is reached, the influence of europium hydrolysis, the influence of atmospheric carbon dioxide, the influence of a competitive ligand such as diglycolic acid and the number of HDBM molecules that are consumed by each europium ion during extraction. The europium hydrolysis constants were determined by the potentiometric method, in presence or absence of carbonate ions and with those data distribution diagrams of the europium chemical species were obtained which were present in the aqueous phases of the extraction with dissolvant. (Author)

  15. Essential adaptation of the calcium influx assay into liposomes with entrapped arsenazo III for studies on the possible calcium translocating properties of acidic phospholipids

    NARCIS (Netherlands)

    Smaal, Erik B.; Mandersloot, Jacqueline G.; Kruijff, B. de; Gier, Johannes de

    1985-01-01

    An adapted version of the Ca2+ influx assay of Weissmann et al. (Weissmann, G., Anderson, P., Serhan, C., Samuelson, E. and Goodman, E. (1980) Proc. Natl. Acad. Sci. USA 77, 1506–1510) is presented for studies on the possible ionophoretic properties of acidic phospholipids. This method is based on t

  16. Placenta previa percreta left in situ - management by delayed hysterectomy: a case report

    Directory of Open Access Journals (Sweden)

    Stefanovic Vedran

    2011-08-01

    Full Text Available Abstract Introduction Placenta percreta is an obstetric emergency often associated with massive hemorrhage and emergency hysterectomy. Case presentation We present the case of a 30-year-old African woman, gravida 7, para 5, with placenta percreta managed by an alternative approach: the placenta was left in situ, methotrexate was administered, and a delayed hysterectomy was successfully performed. Conclusions Further studies are needed to develop the most appropriate management option for the most severe cases of abnormal placentation. Delayed hysterectomy may be a reasonable strategy in the most severe cases.

  17. Efectos de la cobertura vacunal previa en la dinamica de un brote de sarampion

    Directory of Open Access Journals (Sweden)

    Luna Sánchez Antonio

    1997-01-01

    Full Text Available FUNDAMENTO: La eficacia de una vacuna debería medirse mediante ensayos clínicos controlados, no obstante, aspectos éticos lo impiden. Orenstein sugiere que se estime la eficacia de una vacuna mediante, entre otros métodos, el estudio de los brotes epidémicos de la enfermedad caso de ser posible. El presente estudio plantea el cálculo de la eficacia vacunal en el terreno y de los efectos protectores de un programa de vacunación mediante el análisis de un brote epidémico de sarampión. MATERIAL Y MÉTODOS: Estudio de cohortes retrospectivo. La población de estudio la constituyó el grupo de niños nacidos en el municipio de Aznalcollar (localidad de 5.571 habitantes perteneciente al Distrito Sanitario Aljarafe-Sevilla entre dos brotes epidémicos de sarampión ocurridos en dicha localidad en los años 1986 y 1994. Se excluyeron de la cohorte a aquellos niños que a comienzos del brote de 1994 no habían cumplido la edad de vacunación y también a quienes tuvieron exposición anterior al virus, es decir los nacidos antes y durante la epidemia de 1986. El estudio incluyó a vacunados y no vacunados. Todos los casos cumplían los criterios diagnósticos establecidos. A todos los niños en seguimiento se les revisó sus antecedentes vacunales. Tras el cálculo de las tasas de ataque en vacunados y no vacunados, se determinaron la eficacia vacunal y los efectos indirectos totales y medios del programa de vacunación. RESULTADOS: La vacuna resultó eficaz en el 91'5 % de los vacunados. El programa de vacunación produjo una reducción del número de casos en los no vacunados del 78'9%, del 98% en los vacunados y del 92% en el conjunto de la cohorte estudiada, siendo la cobertura vacunal de la misma del 66'4%. CONCLUSIONES: Los efectos de la vacunación y la eficacia vacunal pueden y deben ser calculados aprovechando la aparición de brotes epidémicos caso de ser posible. Se recomienda incrementar las coberturas de vacunación de la población y mejorar así los efectos protectores del programa.

  18. Consideraciones previas a una teoría de la verdad

    Directory of Open Access Journals (Sweden)

    Óscar Augusto García Zárate

    2011-05-01

    Full Text Available Sobre la base de considerar que la verdad es una propiedad, el autor sostiene que se predica de proposiciones, creencias, afirmaciones y oraciones, en el orden jerárquico correspondiente. Asimismo, presenta unbosquejo de tres teorías de la proposición, y concluye que es indiferente declararse a favor de cualquiera, ya que todas consideran a las proposiciones como entes privilegiados con respecto a la atribución del predicado ‘verdadero’. Finalmente, arguye que un problema tan complejo como laelaboración de una teoría de la verdad es el de una teoría de las proposiciones. Palabras claves: Verdad, propiedades, proposición, filosofía del lenguaje, filosofía de la lógica.

  19. AUTORIZACIONES, COMUNICACIONES PREVIAS Y DECLARACIONES RESPONSABLES EN LA TRANSPOSICIÓN DE LA DIRECTIVA DE SERVICIOS

    Directory of Open Access Journals (Sweden)

    Julio V. González García

    2010-10-01

    Full Text Available The approval of the Directive on services and its transposition has provokeda considerable change in the form of administrative intervention in serviceactivities; in the sense of limiting intervention mechanisms, restricting theuse of traditional authorisations and replacing them with self-regulationelements, notice registry and compliance statements. The study focuses onthe analysis of the basic elements of these required authorisations; a regulationthat has a certain impact on the constitutional system for distributingcompetences.

  20. Optimización y validación metodológica de la cuantificación de arsénico por inyección en flujo-generación de hidruros- espectrometría de absorción atómicas (IF-GH-EAA previa derivatizacíon con L-Cisteína Optimización and validation method for arsenic quantification by flow injection-hydride generation - atomic absorption spectrometry (fi-hg-aas after L-Cysteine derivatization

    Directory of Open Access Journals (Sweden)

    Julio A Navoni

    2009-12-01

    Full Text Available El arsénico (As es un contaminante natural que afecta una amplia zona de Argentina. El nivel de As en agua de consumo es utilizado para evaluar la fuente de exposición y en orina para evaluar exposición a este tóxico. El presente trabajo tuvo como objetivo la optimización y validación metodológica de una técnica para la cuantificación de As [As suma = As inorgánico (AsI + especies metiladas: ácido monometilarsónico (MMA y ácido dimetilarsínico (DMA], producto del metabolismo del AsI, por inyección en flujo- generación de hidruros- espectrometría de absorción atómica (IF-GH-EAA, previa derivatización con L-cisteína. La recuperación de las especies estudiadas: AsI (AsIII y AsV, MMA y DMA fue cercana al 100% en todos los casos. Los límites de detección y cuantificación encontrados fueron para agua y orina: 2 y 3 μg/L; 5 y 8 μg/L respectivamente y el rango dinámico de trabajo establecido fue desde 5 a 75 μg/L, permitiendo cuantificar As en muestras de agua cercanos a los estándares internacionales vigentes para valores máximos de As en agua de consumo y en orina en niveles comparables con los establecidos en población laboralmente no expuesta. Esta propuesta metodológica es una alternativa para evaluar la exposición al As en muestras de agua y orina, sin necesidad de utilizar prolongados pre-tratamientos de muestra, de forma más rápida y económica.Arsenic (As is a natural contaminant that affects a large area of Argentina. Quantification of As in drinking water has been used to evaluate the source of exposure and As in urine to assess exposure to this toxic. This study aimed to optimize and validate a methodological technique for the quantification of As [As sum = inorganic As (AsI + methylated species: monometilarsonic acid (MMA and dimetilarsinic acid (DMA], product of AsI metabolism by flow injectionhydride generation-atomic absorption spectrometry (FI-GH-AAS, after derivatization with L-cysteine. The recovery

  1. Cuantificación de arsénico por inyeccion en flujo-generación de hidruros-espectrometría de abosorcion atómica (IF-GH-EAA previa derivatzación con l-cisteína: Validación y comparación intermetodológica utilizando dos técnicas de referencia Arsenic quantitation by flow injection-hydride generation-atomicabsorption spectrometry (FI-HG-AAS after l-cysteine derivatization: Validation and inter-methodological comparison using two reference techniques

    Directory of Open Access Journals (Sweden)

    Julio A Navoni

    2010-12-01

    Full Text Available La presencia de Arsénico (As en aguas de consumo representa una problemática para la salud pública en muchas regiones del mundo, incluida la Argentina. La cuantificación de arsénico en agua de bebida y en orina se utiliza para evaluar la exposición a este contaminante. El presente trabajo tuvo como objetivo la validación metodológica de una técnica para la cuantificación de especies del As [AsV + AsIII + ácido monometilarsónico (MMA + ácido dimetilarsínico (DMA] por inyección en flujo-generación de hidruros-espectrometría de absorción atómica (IF-GH-EAA, previa derivatización con L-cisteína. Los resultados fueron comparados con los obtenidos utilizando dos metodologías de referencia, generación de hidruros-espectrometría de absorción atómica (GH-EAA para muestras de aguas y orina, y cromatografía de alta resolución -generación de hidruros-espectrometría de absorción atómica (HPLC-GH-EAA para muestras de orina. Además, se evaluó la selectividad de la cuantificación por IF-GH-EAA, en presencia de otras especies químicas del As, provenientes del consumo de alimentos producto de la pesca, a través de un ensayo biológico. Los niveles de As hallados en las muestras de agua y de orina utilizando las técnicas de referencia presentaron un rango de 6 a 176 μg/L y de 143 a 3312 μg/g de creatinina, respectivamente. Los coeficientes de Pearson resultantes de la comparación de los datos obtenidos por IF-GH-EAA, con los logrados por los métodos de referencia fueron r = 0,9976 y r = 0,9422, para agua y orina, respectivamente. Los resultados de la prueba biológica indicaron un mayor nivel de As, debido al consumo de alimentos producto de la pesca, cuando las muestras de orina fueron previamente mineralizadas (GH-EAA, con la consecuente sobreestimación del contenido de As proveniente del consumo de As inorgánico. Este aumento no se observó cuando éstas fueron analizadas por IF-GH-EAA. Los valores, encontrados

  2. Destrezas matemáticas previas de los estudiantes de grado en Ingenierías y Arquitectura

    OpenAIRE

    Campo Bagatín, Adriano; Beléndez Vázquez, Tarsicio; Moreno Marín, Juan Carlos; Ortuño Sánchez, Manuel; Torrejon, Jose M.; Verdú Monllor, Ferran Josep

    2015-01-01

    Muchos profesores de asignaturas de física y de matemáticas que imparten docencia en el primer curso de las titulaciones técnicas de Grado detectan un empeoramiento de las destrezas matemáticas básicas de los alumnos de nuevo ingreso. Esta situación dificulta el proceso de enseñanza-aprendizaje y lastra negativamente las posibilidades de éxito de muchos estudiantes de primer curso. Esta clara sensación, sin embargo necesita de una definición cuantitativa. En este proyecto, nos planteamos real...

  3. Derechos colectivos y consulta previa: territorio cucapá y recursos pesqueros en Baja California, México

    OpenAIRE

    Alejandra Navarro Smith; Yacotzin Bravo Espinosa; Catalina López-Sagástegui

    2015-01-01

    Las demandas de reconocimiento de derechos territoriales y de uso de los recursos naturales que los pescadores cucapás le hacen al Estado mexicano, desde 1993, después de la creación de la Reserva del Alto Golfo de California y Delta del Río Colorado (en adelante, la Reserva), son unas más en el panorama de los problemas socioambientales y de despojo territorial, que afectan a los pueblos originarios en México. La característica particular en este caso es que el Estado mismo es quien construy...

  4. Esfuerzos cooperativos y etapas previas en la internacionalización: el caso de Telefónica

    OpenAIRE

    Calvo Calvo, Ángel, 1949-

    2014-01-01

    Este artículo explora un terreno relativamente poco cultivado por los historiadores económicos de los países de habla hispana pese al formidable atractivo de sus implicaciones económicas, tecnológicas, normativas y geopolíticas. De acentuado enfoque interdisciplinar, descansa en una combinación equilibrada de fuentes primarias y secundarias. Se enmarca, sin asumir la totalidad de sus postulados, en la escuela gradualista de Upsala y aborda la «internacionalización antes de la internacionaliza...

  5. Los medios digitales en los procesos creativos con jóvenes en formación previa al empleo

    OpenAIRE

    Reimann, Daniela

    2015-01-01

    Este articulo está basado en el proyecto de investigación MediaArt@Edu (acrónimo), financiado bajo el programa de “Fortalecimiento de habilidades en medios de comunicación para educación orientada a medios en calificación vocacional’ del Ministerio Federal de Educación e Investigación de Alemania (BMBF, por sus siglas en Alemán), y coordinado por el Instituto de Educación Vocacional y General del Instituto de Tecnología de Karlshruhe, en cooperación con el Centro para el Arte y lo...

  6. Concepciones previas de los estudiantes de Grado en Educación Primaria sobre la competencia digital de los escolares

    OpenAIRE

    Gutiérr ez-Cabello, Aingeru; Losada, Daniel; Correa, José Miguel

    2015-01-01

    La presente investigación tiene por objetivo estudiar las concepciones sobre las que parte los estudiantes de Grado en Educación Primaria sobre la competencia digital a lograr por su futuro alumnado. En la actualidad existen diversos autores que abogan por un desarrollo del constructo de la competencia digital basado en la multialfabetización. Por ello, a fin de recoger las diferentes creencias que subyacen al término se procedió a la construcción de una escal...

  7. Predicción del rendimiento académico final a partir de pruebas previas en asignaturas cuantitativas.

    Directory of Open Access Journals (Sweden)

    Clara Isabel González Martínez

    2004-01-01

    Full Text Available Es indudable que someter a un proceso de evaluación continua a los alumnos tiene enormes ventajas para provocar el seguimiento y mantenimiento del hilo argumental de asignaturas que les resultan complejas como pueden ser las matemáticas y la Estadística. Más aún si, además, hablamos de un primer curso. En la presente comunicación tratamos de poner de manifiesto una utilidad más que puede ofrecernos la evaluación continua, que consiste en predecir cuál va a ser el rendimiento académico final del alumno, en junio y/o en septiembre, mediante modelos de regresión lineal múltiple y modelos logit. Para ello se tendrán en cuenta, además de otras variables, los resultados obtenidos en varias pruebas obligatorias de la asignatura de estadística antes del mes de Diciembre. De este modo y mediante la aplicación de alguno de los modelos referenciados antes, se estará en condiciones de saber cuál puede ser el resultado final del alumno en todo el curso, pudiendo implementarse un proceso de intervención que trate de solucionar y encauzar a aquellos alumnos con peores pronósticos.

  8. Parasitosis intestinal extrema en la infancia previa al desarrollo de enfermedades reumáticas inflamatorias/autoinmunes

    OpenAIRE

    F. Javier Jiménez-Balderas; Adolfo Camargo-Coronel; Juan O. Talavera; José Gutiérrez; Abraham Zonana-Nacach; Ernesto A. Jiménez-Balderas

    2008-01-01

    Objetivo. Investigar la asociación del antecedente de parasitosis intestinal extrema (PIE) durante la infancia enpacientes ahora adultos con enfermedades reumáticas/ autoinmunes (ERAI). Métodos. Se estudiaron 54 pacientes consecutivos con ERAI, (27 con espondilitis anquilosante 9 con artritis reumatoide, 19 con lupus eritematoso sistémico) y 54 controles sanos; 27 hombres y 27 mujeres. Todos los sujetos tenían padres que informaran de eventos PIE durante la infancia, previos al inicio de la E...

  9. La erosión de las certezas previas: significados, percepciones e impactos del desempleo en la experiencia argentina

    Directory of Open Access Journals (Sweden)

    María Cristina Bayón

    2003-06-01

    Full Text Available In Argentina, the disruptive effects of unemployment acquire particularly serious dimensions because of the context of disintegration of what was previously a relatively well established social and employment structure.This article examines the experience, meanings and perceptions of work and unemployment, with particular emphasis on their dynamic and heterogeneous nature. The article offers a critical review of the literature on unemployment and an analysis of the major transformations of the employment market from the 1980s on, before proceeding to demonstrate, through in–depth interviews, the concrete repercussions of these processes on “ordinary people”. It thus aims to provide an appreciation of unemployment from a broad perspective, and contribute to a reformulation of welfare politics with a comprehensive, overall vision.

  10. Ideas previas en el aprendizaje del efecto invernadero y el calentamiento global en estudiantes universitarios de ciencias exactas y naturales

    OpenAIRE

    Gulizia, Carla; Zazulie, Natalia

    2012-01-01

    El calentamiento global es un tema presente en la mayoría de los cursos iniciales de Ciencias de la Atmósfera y representa una problemática a nivel social que es ampliamente discutida tanto por científicos expertos, tomadores de decisiones, comunidades educativas y de protección ambiental. Es por esto que adquiere real importancia que este tema sea correctamente entendido por los estudiantes de niveles medio y superior que podrían eventualmente cumplir diversos roles en la sociedad. En este t...

  11. Derechos colectivos y consulta previa: territorio cucapá y recursos pesqueros en Baja California, México

    Directory of Open Access Journals (Sweden)

    Alejandra Navarro Smith

    2015-07-01

    Full Text Available Las demandas de reconocimiento de derechos territoriales y de uso de los recursos naturales que los pescadores cucapás le hacen al Estado mexicano, desde 1993, después de la creación de la Reserva del Alto Golfo de California y Delta del Río Colorado (en adelante, la Reserva, son unas más en el panorama de los problemas socioambientales y de despojo territorial, que afectan a los pueblos originarios en México. La característica particular en este caso es que el Estado mismo es quien construye los marcos legales en materia de protección a las especies —sin consultar debidamente a dichos pueblos—, volviendo ilegal la presencia cucapá en esa zona y vulnerando sus derechos como población indígena del delta. En consecuencia, las autoridades medioambientales y de pesca mexicanas han constituido la zona del delta del río Colorado como un territorio en disputa, al implementar esquemas de protección ambiental y de pesca, sustentados en modelos disciplinarios, que únicamente se alimentan de información biológica y pesquera. El conflicto se genera cuando se deja al elemento humano fuera de los análisis, como si las comunidades asentadas en los territorios protegidos y usuarias de los recursos no formaran parte de los ecosistemas. Al crear el núcleo de la Reserva en el mismo lugar donde se encontraban los campamentos de pesca del pueblo cucapá se volvió ilegal el aprovechamiento de los recursos pesqueros en la zona. En este contexto se han criminalizado las acciones de resistencia con las que los cucapás responden ante la regulación medioambiental del delta del río Colorado. Al ver imposibilitada la continuidad de su práctica pesquera, los habitantes se organizan para defender su acceso al territorio y, en un sentido más amplio, sus formas de vida y de trabajo. Este caso, en particular, visibiliza maneras contemporáneas por las que el Estado despoja el territorio y desaparece prácticas culturales propias de los pueblos naturales, a través de ciertos discursos y prácticas legales —en este caso los de conservación—. 

  12. Preliminary evaluation of anhydrous ethanol as a solvent in the oilseed extraction of Jatropha curcas L.; Evaluacion preliminar del etanol anhidro como solvente en la extraccion de aceite de semillas de jatrofa (Jatropha curcas L.)

    Energy Technology Data Exchange (ETDEWEB)

    Brossard-Gonzalez, C.; Ferrari, R. A.; Pighinelli, A. L.; Park, K. J.

    2010-07-01

    A preliminary evaluation was performed on anhydrous ethanol as a solvent for the extraction of oil from whole Jatropha curcas L. seeds (32.24 % lipids, 16.05 % proteins), supplied from Mato Grosso, Brazil. The methodology of factorial 2k designs was followed, which included a comparison between pressing and n-hexane extraction methods. The regression model corresponding to the comparison between ethanol and n-hexane, varying extraction time, did not have lack of fit and presented an R2 of 99%. The experimental design for the pressing method, varying press rotation speed and temperature, yielded a poorly fitted linear model. The oil composition extracted with ethanol was similar to those obtained by n-hexane and by pressing. The highest yield (36.7%) was obtained using ethanol for 4 hours. The excess of extracted material was attributed to additional solubilization of impurities that could be diminished by limiting the extraction time to 1 hour. The oil extracted with ethanol and by pressing have the same color. It is presumed that the purification steps for both oils should be similar. Further studies using mixtures of ethanol with small proportions of n-hexane are suggested. (Author) 20 refs.

  13. IDENTIFICACIÓN DE LAS CARACTERÍSTICAS DE UNA OCLUSIÓN IDEAL AL TÉRMINO DEL TRATAMIENTO DE ORTODONCIA SIN EXTRACCIONES, MEDIANTE LAS LLAVES DE LA OCLUSIÓN DE ANDREWS.

    OpenAIRE

    Contreras Alvarado, Karla

    2012-01-01

    Antecedentes: A principios de los años setenta el Dr. Lawrence F. Andrews publicó un artículo en el que discute seis características significativas que se encontraron constantemente en un estudio realizado a 120 pacientes no ortodóncicos con una oclusión normal. El autor se refirió a estas cualidades como las Seis llaves de la oclusión normal (Six keys to normal occlusion) Hoy día siguen vigentes e importantes en el éxito de un tratamiento ortodóntico. Objetivo: Identific...

  14. Sequential chemical extraction of heavy metals in a study of the chemical alteration of mine tailings at Ticapampa (Huaraz, Peru); Extraccion quimica secuencial de metales pesados en el estudio de alteracion quimica de relaves de mina en Ticapampa (Huaraz, Peru)

    Energy Technology Data Exchange (ETDEWEB)

    Jara Facundo, M. A.

    2011-07-01

    The upper reaches of the Rio Santa (Huaraz, Peru) are highly affected by the mining activities of generally small and very small mining companies located in two specific areas, Cordillera Blanca, and Cordillera Negra, with the largest mining claims located in the districts of Recuay and Ticapampa. To assess the mobility and bioavailability of heavy metals in the abandoned tailings pond belonging to the Alianza mining company in the district of Ticapampa, and to identify the fractions to which they are associated we applied a sequential chemical extraction. The results were compared with studies into their mineralogical characterization, a quantitative chemical analysis and a determination of potential acidity and potential neutralization by the ABA (acid-base accounting) method applied to samples of tailings. The sequential extraction procedure confirmed the mode of general alteration observed in the area through mineralogical studies: a relatively easy mobility of Pb, and Cd, and considerable immobility with regard to Ag, Cr and Co, as well as an intermediate mobility of Cu, Zn, and As. Significant cadmium and lead contents found in the most mobile fractions of the tailings may represent an environmental threat, bearing in mind the toxic nature of these elements. Despite the low mobility of arsenic, the total quantities of this element are so high that the waters of the Rio Santa are being affected. (Author) 22 refs.

  15. Study of copper extraction in mineral from La Virgen, Santa Maria de la Cabeza (Jaen); Estudio de la extraccion de cobre en mineral de la mina La Vigen de Santa Maria de la Cabeza (Jaen)

    Energy Technology Data Exchange (ETDEWEB)

    Batuecas Rodriguez, T.; Sanz Garcia, H.; Urgell Comas, M.; Perez Bustamante, J. A.; Sevilla Benito, A.; Cruz Castillo, F. de la; Fernandez Cellini, R.

    1957-07-01

    Extraction conditions of copper are studied by leaching in an acid medium. The mineral is from the ore La Virgen in the mining area Sta. M. de la Cabeza, proprietor the JEN. From obtained results a previous toasting of the mineral is considered to be convenient, and after an attack of it while hot and with a 5% sulphuric acid approximately. the use of different acids in place of sulphuric as leaching agents does not affect the efficiency manifestly in the copper extraction. (Author) 13 refs.

  16. Ni, Co recovery study and Fe by acid leaching in columns; Estudio de la extraccion de Ni, Co y Fe en lateritas por medio de lixiviacion acida en columnas

    Energy Technology Data Exchange (ETDEWEB)

    Yorio, C. di; Betancourt, E.; Vivas, R.; Rus, J.

    2006-07-01

    In the following work the possibility of the mic kel recovery by hydrometallurgy extraction for nickeliferous laterite is studied. The work looks for to study the technical viability of the extraction of nickel and cobalt by means of the application of heap leaching. The ore is chemically and physically characterized with the purpose of analyzes its composition and mineral phase, by means of x-rays diffraction, quantitative chemical analysis and elementary chemical analysis by electronic microscopy. One the ore is characterized, it is mixed with sulfuric acid to relations 0.05; 0.1 and 0.2 g acid/g to agglomerated pellets and paste, with the aim to improve the percolation in column, due to the argillaceous nature of the ore leaching rate ranged from 0.305 to 1.06 x 10 l/h m''2 and in the agglomerate condition of the percolation l/h m''2 improves at interval 3.05 to 6.11 x 100 l/h m''2. (Author)

  17. The recovery of copper by leaching-solvent extraction-electrowinning: Towards the XXI century; La recuperacion de cobre mediante lixiviacion-extraccion con disolventes electrolisis: hacia el siglo XXI

    Energy Technology Data Exchange (ETDEWEB)

    Alguacil, F.J. [Centro Nacional de Investigaciones Metalurgicas. Madrid (Spain)

    1998-12-31

    The obtention of copper from primary resources by solvent extraction has been developed continuously over the past 25-30 years, entailing a continuous effort both of research and development and being one of the biggest successes in the industrial development of a given metal. The success of this operation was not possible without the corresponding developments, at the same time, of the two accompanying operations (leaching and electro wining), which perfectly coupled in the operational sequence. The recovery of copper by means of these hydrometallurgical processes is firmly established and being reflecting in the growing number of operational plants under construction and/or commissioned until the beginning of the XXI century. This work presents data on the successfully application of the sequence of operations on the recovery of a metal: copper (Author) 19 refs.

  18. Improvements mineral dressing and extraction processes of gold-silver ores from San Pedro Frio Mining District, Colombia; Mejora de los procesos de beneficio y extraccion de minerales auroargentiferos del asentamiento minero de San Pedro Frio, Colombia

    Energy Technology Data Exchange (ETDEWEB)

    Yanez Traslavina, J. J.; Vargas Avila, M. A.; Garcia Paez, I. H.; Pedraza Rosas, J. E.

    2005-07-01

    The San Pedro Frio district mining, Colombia, is a rich region production gold-silver ores. Nowadays, the extraction processes used are amalgamation, percolation cyanidation and precipitation with zinc wood. Due to the ignorance of the ore characteristics, gold and silver treatment processes are inadequate and not efficient. In addition the inappropriate use of mercury and cyanide cause environmental contamination. In this research the ore characterization was carried out obtained fundamental parameters for the technical selection of more efficient gold and silver extraction processes. Experimental work was addressed to the study of both processes the agitation cyanidation and the adsorption on activated carbon in pulp. As a final result proposed a flowsheet to improve the precious metals recovery and reduce the environment contamination. (Author)

  19. Comparacion de la viabilidad de las semillas obtenidas por medio de las tecnicas de extraccion fisica por lavado y de germinacion Comparing the viability of seeds obtained by the physical extraction techniques VBP and VBP plus germination

    Directory of Open Access Journals (Sweden)

    M.S. Zuluaga

    2004-06-01

    Full Text Available El objetivo del presente trabajo fue comparar la viabilidad obtenida por la técnica de viabilidad por presión (VPP respecto de la viabilidad obtenida por una combinación de la metodología VPP más germinación. Asimismo se trató de establecer si ambos procedimientos determinan la viabilidad de las mismas especies o si existen diferencias en las especies establecidas como viables. El número de semillas viables estimado por la técnica VPP fue de 3475 (9,85% del total del banco de semillas, en tanto el número de semillas no viables fue de 31795 (90,15% del total del banco de semillas. Luego de aplicar la técnica de germinación (5 ciclos sobre ambas categorías, en las viables se obtuvo una germinación de 3286 semillas (9,32% del total del banco de semillas, no germinando 189 semillas (0,53% del total de dicho banco. Hubo un 7.23% adicional del banco de semillas que resultó viable por germinación, cuando previamente había sido considerado no viable por la técnica VPP. Los resultados alcanzados muestran que la técnica VPP realiza una subestimación significativa del banco de semillas, en tanto la sobreestimación no alcanzó niveles de significancia. Estos resultados ponen de manifiesto que con la técnica VPP no sólo se obtiene un menor número total de semillas viables, sino que no permitiría reflejar la verdadera proporción de semillas viables y no viables del banco total. Cuando se incorpora al análisis la técnica de germinación, se encuentra que la proporción del banco no es la misma de acuerdo a la metodología empleada, pues mientras la VPP establece, dentro del banco, semillas viables y no viables, se observó que aplicando la técnica de germinación algunas semillas consideradas viables no germinaron mientras que otras consideradas como no viables sí lo hiciero.The objective of this study was to compare the viability of seeds obtained through the techniques "viability by pressure" (VBP and "viability by pressure plus germination" (VBP-G. Thus, differences were established between the techniques regarding the weed seeds considered viable. A total of 3475 "viable" seeds m-2 (9.85% of the total seed bank and 31795 "non viable" seeds m-2 (90.15% of the total seed bank were determined by using the VBP method. After application of five germination cycles of both categories, 189 seeds m-2 did not germinate although they had been estimated as "viable'' by the VPB method. No significant differences (p=0.15, f= 2.33 were found between the viability values obtained by the VBP and germination methods. Thus, large differences in the "non-viable" category appeared, since 2549 seeds m-2 germinated despite being estimated as "non-viable" by the VBP technique. The results showed that a significant soil seed bank estimate was obtained when applying the VBP technique, i.e., overestimation (VBP-VBP/G did not reach a significant level (0.53% of the soil seed bank total. The use of VBP technique results in a lower "viable" seed number prediction and a modified seed bank proportion.

  20. Analytical Evaluation to Determine Selected PAHs in a Contaminated Soil With Type II Fuel; Metodo Optimizado de Extraccion por Ultrasonidos para la Determinacion de PAHs Seleccionados en un Suelo Contaminado con Fuel de Tipo II

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Alonso, S.; Perez Pastor, R. M.; Sevillano Castano, M. L.; Garcia Frutos, F. J.

    2010-10-21

    A study on the optimization of an ultrasonic extraction method for selected PAHs determination in soil contaminated by type II fuel and by using HPLC with fluorescence detector is presented. The main objective was optimize the analytical procedure, minimizing the volume of solvent and analysis time and avoiding possible loss by evaporation. This work was carried out as part of a project that investigated a remediation process of agricultural land affected by an accidental spillage of fuel (Plan Nacional I + D + i, CTM2007-64 537). The paper is structured as: Optimization of wavelengths in the chromatographic conditions to improve resolution in the analysis of fuel samples. Optimization of the main parameters affecting in the extraction process by sonication. Comparison of results with those obtained by accelerated solvent extraction. (Author) 3 refs.

  1. Dosimetry of irradiated foods and extraction of polyminerals from herbs and seasonings (Guajillo chili, oregano, jamaica, arnica, and camomile); Dosimetria de alimentos irradiados y extraccion de poliminerales de hierbas y condimentos (Chile guajillo, oregano, jamaica, arnica y manzanilla)

    Energy Technology Data Exchange (ETDEWEB)

    Pineda C, S.; Gomez B, C. [Estudiante de la Facultad de Quimica, UNAM (Mexico); Calderon, T.; Cruz Z, E. [Depto. de Quimica Agricola-Geologia-Geoquimica, Universidad Autonoma de Madrid, 28049 (Spain)

    2002-07-01

    Nowadays, in developed countries the irradiation technology is a process used in food treatments for sterilization and diminishing of the microbiological charge, as well as to extend the storage life. In Mexico, the food irradiation, spices and seasonings has been officially approved since 1995, recognizing as an adequate technological process for foods. Taking advantage of knowledge about solids and due to the natural growth of the spices, herbs, etc. these contain minerals which can providing important information of its radiological history, moreover these type of materials do not degrade them preserving by long time periods. In this work, a methodology for the extraction of poly minerals in foods, such as oregano, guajillo chili, jamaica, arnica and camomile is presented. For obtaining the poly mineral, the samples were treated with an ethanol-water solution, in constant stirring during 12 hours at room temperature depending on the sample under treatment. It was used oxygenated water and distilled for washing and acetone for achieving a good drying. The minerals were processed by gamma radiation in the Nuclear Sciences Institute of the UNAM. The brilliance curves of spices and herbs, using a Tl reader of Harshaw 3500 were obtained, the emissions are located between 60 and 350 Centigrade. Previously the extraction of poly mineral was realized and they were divided in same parts for doses between 2 and 10 KGy, this last value according to the Mexican Official Standard considering a fraction without irradiating as reference. The identification of the mineral fraction by diffraction will complement the composition information. We are grateful to the donation of seasonings samples provided by the Tres Villas Natural Seasonings enterprise, Toluca plant, State of Mexico and the Academic Exchange Office at UNAM. (Author)

  2. Arsenic Mobility and Availability in Sediments by Application of BCR Sequential Extractions Method; Movilidad y Disponibilidad de Arsenico en Sedimentos Mediante la Aplicacion del Metodo de Extracciones Secuenciales BCR

    Energy Technology Data Exchange (ETDEWEB)

    Larios, R.; Fernandez, R.; Rucandio, M. I.

    2011-05-13

    Arsenic is a metalloid found in nature, both naturally and due to anthropogenic activities. Among them, mining works are an important source of arsenic release to the environment. Asturias is a region where important mercury mines were exploited, and in them arsenic occurs in para genesis with mercury minerals. The toxicity and mobility of this element depends on the chemical species it is found. Fractionation studies are required to analyze the mobility of this metalloid in soils and sediments. Among them, the proposed by the Bureau Community of Reference (BCR) is one of the most employed. This method attempts to divide up, by operationally defined stages, the amount of this element associated with carbonates (fraction 1), iron and manganese oxy hydroxides (fraction 2), organic matter and sulphides (fraction 3), and finally as the amount associated residual fraction to primary and secondary minerals, that is, from the most labile fractions to the most refractory ones. Fractionation of arsenic in sediments from two mines in Asturias were studied, La Soterrana and Los Rueldos. Sediments from La Soterrana showed high levels of arsenic in the non-residual phases, indicating that the majority of arsenic has an anthropogenic origin. By contrast, in sediments from Los Rueldos most of the arsenic is concentrated in the residual phase, indicating that this element remains bound to very refractory primary minerals, as is also demonstrated by the strong correlation of arsenic fractionation and the fractionation of elements present in refractory minerals, such as iron, aluminum and titanium. (Author) 51 refs.

  3. Catalytic spectrophotometric determination of trace vanadium based on oxidation of arsenazo Ⅲ with bichromate%偶氮胂Ⅲ-重铬酸钾体系催化动力学光度法测定痕量钒

    Institute of Scientific and Technical Information of China (English)

    徐琼; 周之荣

    2007-01-01

    基于稀HCl介质中,在表面活性剂Triton X-100存在下,痕量钒(V)对重铬酸钾氧化偶氮胂Ⅲ(AsA Ⅲ)的褪色反应有明显的催化作用,建立了测定痕量钒(V)的动力学光度法.方法检出限为0.15 μg/L,线性范围为0~20.0 μg/L.在25 mL溶液中,测定0.5 μg钒(V)的相对标准偏差为3.23%(n=11).讨论了酸度、反应物浓度、温度、反应时间、干扰离子等因素的影响.研究了反应的最佳条件,并测定了一些动力学参数,催化反应的表观活化能为30.21 kJ/mol.结合溶剂萃取分离,实现了样品中痕量钒(V)的测定.方法用于人发、植物、茶叶样品中钒(V)的测定,结果与认定值相符;用于测定食品中的痕量钒(V),结果与原子吸收光谱法相符.相对标准偏差为1.18%~4.00%,标准加入回收率为97.5%~102.5%.

  4. Auto-evaluación previa a las prácticas de laboratorio químico: introducción al auto-aprendizaje

    Directory of Open Access Journals (Sweden)

    Noguera Murray, Patricia

    2011-12-01

    Full Text Available In this work a strategy to improve learning outcomes of laboratory sessions of a Chemistry subject of the Bachelor’s Degree in Rural and Agrifood Engineering is shown. In this experience the e-learning platform PoliformaT was used to propose timed pre-lab questionnaires to allow self-assessment of students before laboratory sessions, this allowed an increase in the preparation and the interest of the student on the performance of the laboratory session. The effectiveness of this strategy was established from the analysis of data collected during its application and also by means of an opinion call. It is noteworthy that these questionnaires have induced change of attitude among students, encouraging an active posture (and positive towards the laboratory session.

    En este trabajo se muestra una estrategia para mejorar los resultados de aprendizaje en las prácticas de laboratorio en una asignatura de Química del Grado en Ingeniería Agroalimentaria y del Medio Rural realizando cuestionarios previos temporizados usando la plataforma e-learning PoliformaT. De este modo, se ha permitido la auto-evaluación de los alumnos antes de realizar una sesión de prácticas, fomentando la preparación y el interés del alumno en su realización y consiguiendo un mayor aprovechamiento de los recursos. La eficacia de esta estrategia se ha establecido a partir del análisis de datos recogidos durante la aplicación y realizando un sondeo de opinión. La aplicación de estos cuestionarios ha permitido un cambio de actitud en los alumnos, fomentando una actitud activa (y positiva hacia las prácticas y consiguiendo un mayor aprovechamiento de las mismas.

  5. The Uterine Sandwich Method for Placenta Previa Accreta in Mullerian Anomaly: Combining the B-Lynch Compression Suture and an Intrauterine Gauze Tampon

    Directory of Open Access Journals (Sweden)

    Mustafa Kaplanoğlu

    2013-01-01

    Full Text Available Mullerian duct anomalies may cause obstetric complications, such as postpartum hemorrhage (PPH and placental adhesion anomalies. Uterine compression suture may be useful for controlling PPH (especially atony. In recent studies, uterine compression sutures have been used in placenta accreta. We report a case of PPH, a placenta accreta accompanying a large septae, treated with B-Lynch suture and intrauterine gauze tampon.

  6. ISO 14006. Experiencias previas de estudios de arquitectura que han adoptado el estándar de ecodiseño UNE 150301:2003

    Directory of Open Access Journals (Sweden)

    Arana-Landín, G.

    2012-09-01

    Full Text Available This paper aims to analyze the pioneer UNE 150301 standard, as well as its adoption process and its practical results in the sector of architecture studios. First, the structure, the aim and the scope of norm UNE 150301 have been analysed. Second, the standard's implementation has been examined, concluding that 73% of the companies that have obtained the certificate are architecture studios. A case study has therefore been carried out with the participation of five architecture studios pioneers. These experiences have let us know the main aspects and difficulties of the process. In conclusion, the adoption of the standard UNE 150301 can be a helpful tool in order to reduce the environmental impact of the products and obtain some competitive advantages such as cost reduction, improvement in energy efficiency of the product and a better adaptation to acts and regulations.

    En este artículo se analiza la experiencia de implantación de la norma UNE 150301 de ecodiseño en el sector de los estudios de arquitectura. Tras el examen de la estructura de norma UNE 150301, de sus objetivos y de su alcance, se analiza su difusión, destacándose que el 73% de las empresas certificadas en España son estudios de arquitectura. A continuación se estudia el proceso de implantación real, mediante el estudio de caso que lo analiza en cinco estudios de arquitectura. El estudio realizado permite conocer de primera mano las principales claves y dificultades del proceso de implantación del estándar, así como los resultados obtenidos, entre los que destaca una reducción del impacto ambiental. Se constata, en suma, que la norma UNE 150301 es una herramienta que puede proporcionar ventajas competitivas interesantes a las empresas del sector de los estudios de arquitectura.

  7. La necesaria comprensión previa de la realidad constructiva del monumento: el caso singular de la Cripta de la Colonia Güell

    Directory of Open Access Journals (Sweden)

    Casals Balagué, Albert

    1993-10-01

    Full Text Available The Crypt of the Güell Colony is a building of a unique importance in the history of architecture although it is only a part of the church which Antoni Gaudí designed for Eusebio Güell. It owes its fame to the perfect conjunction of the expressive will of the author and the demands of statics it represents. This conjunction was achieved by using the design method based on the properties of funicular lines. This is where the great paradox of the Crypt lies: it is arable in spite of being a part of a whole which, logically thinking, should have reached the balance only after being completed, which, consequentially, casts doubt on whether the building would have been stable had it been finished. This article presents the conclusions of a study which was carried out by the authors who allow this paradox to be understood. The study is a part of another complete physical-constructive analysis which compiles the necessary information for the restoration of the monument ordered by the Servei de Patrimoni Arquitectonic Local de la Diputación de Barcelona under the direction of the architec Antoni González. The methods for building modelling used in the study range from graphic statics, which does not explain the paradox, to the finite element method, which contributes a sufficient number of facts for such on explanation. The finally developed model is a powerful and reliable tool which allows us to forsee the effects of any modification of the present state of the monument, including those produced by its hypothetical completion.

    La Cripta de la Colonia Güell es un edificio de similar relevancia en la historia de la arquitectura, a pesar de tratarse sólo de una parte de la iglesia que proyectó Antoni Gaudí para don Eusebio Güell. Debe su notoriedad a la conjunción perfecta que en ella se dan entre la voluntad expresiva de su autor y los requerimientos de la estática, conjunción que se consiguió gracias al método de proyecto basado en las propiedades de las líneas funiculares. Y en ello reside la gran paradoja que envuelve a la cripta: ser estable a pesar de ser una parte de un conjunto que, en buena lógica, debería haber alcanzado el equilibrio al haberse completado, lo que, en consecuencia, pone en duda la estabilidad de éste si se hubiera finalizado. El estudio realizado por los autores que permite entender esta paradoja ha utilizado como métodos para modelizar el edificio desde la estática gráfica, que no la explica hasta el método de los elementos finitos, que aporta suficientes datos para comprenderla. El modelo desarrollado finalmente es una herramienta potente y fiable que permite prever los efectos de cualquier modificación del estado actual del monumento, incluidos los producidos por su hipotética finalización.

  8. Spectrophotometric Determination of Microamounts of Uranium previous Extraction with TBP-MIC; Determinacion Espectrofotometrica de Microcantidades de Uranio previa extraccin con Metilisobutilcetona-Fosfato de Tributilo

    Energy Technology Data Exchange (ETDEWEB)

    Vera Palomino, J.; Palomares Delgado, F.; Petrement, J.; Fernandez Cellini, R.

    1962-07-01

    Selective extraction of uranium in nitric acid medium with a mixture of Tbp-MIC (1:10) has been achieved. Aluminium nitrate was used as salting agent. Complexing agents were added in order to avoid extraction of impurities. Extraction conditions have been studied so that extraction is almost practically complete in a single run. (Author) 19 refs.

  9. Una experiencia previa a la implantación del ects en el área de la estadística económico-empresarial

    Directory of Open Access Journals (Sweden)

    Ramírez Hurtado, José Manuel

    2006-01-01

    Full Text Available El Espacio Europeo de Educación Superior (EEES se presenta como el principal reto de los últimos años al que debe enfrentarse la Universidad española. La puesta en marcha de este nuevo marco de acción supone un replanteamiento general de todo lo que se refiere, por un lado, a la estructura de las materias que conformarán las futuras titulaciones y, por otro, a los propios métodos docentes que deberán utilizarse en la impartición y evaluación de dichas materias. Esta comunicación se centra, precisamente, en la experiencia recogida a lo largo de los últimos años sobre estos métodos por parte de los profesores responsables de la docencia de la asignatura de Estadística en la Diplomatura en Ciencias Empresariales de la Universidad Pablo de Olavide, de Sevilla. La implementación de la metodología utilizada es fruto de la puesta en marcha en la Facultad de Ciencias Empresariales, en el curso académico 2002-2003, de un Plan de Mejora de esta titulación. La similitud de lo realizado con el formato del denominado “Eurocrédito” (ECTS puede, sin duda, ser tenida en cuenta para afrontar la próxima docencia de los Grados en el área económico-empresarial bajo dicho formato.

  10. Importancia de la cirugía aorto-ilíaca previa o simultánea en la evolución del trasplante renal

    OpenAIRE

    Martínez Carnovale, Lucía Inés

    2011-01-01

    La malaltia renal crònica terminal, el tractament substitutiu d'elecció és el trasplantament renal, és un problema de salut pública mundial en augment. L'envelliment de la població i la major prevalença de diabetis i hipertensió arterial en aquests pacients, s'associa a una major incidència de malaltia aorto-ilíaca i possible fracàs del ronyó trasplantat. En aquest treball es va analitzar l'evolució del filtrat glomerular en pacients trasplantats renals amb patologia aorto-ilíaca que van requ...

  11. La administración de dosis bajas de oxitocina, previa a la succión, no modifica la respuesta eyectoláctea en madres lactantes

    Directory of Open Access Journals (Sweden)

    Edgard Cobo

    2014-11-01

    Full Text Available Se analizaron 64 registros de presión intramamaria en igual número de mujeres lactantes, que aceptaron participar en diferentes estudios diseñados para explorar la respuesta eyectoláctea a la succión del pezón. Después de aplicar estrictos criterios de inclusión diseñados para este estudio restrospectivo, se logró separar un grupo control y 2 grupos experimentales. Se estudiaron la latencia, el número de contracciones mamarias, el área bajo las mismas y la cantidad calculada de oxitocina liberada por estímulos de succión de 10 minutos de duración. No se encontraron diferencias estadísticamente significativas entre las respuestas mamarias de las pacientes que no recibieron oxitocina (grupo control, las que la recibieron (grupo experimental-1 y las que presentaron actividad eyectoláctea espontáneas antes de la succión (grupo experimental-2.

  12. Amino acids separation with the tetracarboxylic derived of the para-ter-butylcalix[4]arene by means of solid-liquid extraction assisted with lanthanides; Separacion de aminoacidos con el derivado tetracarboxilico del para-ter-butilcalix[4]areno mediante extraccion solido-liquido asistida con lantanidos

    Energy Technology Data Exchange (ETDEWEB)

    Bernal R, R. del C.

    2014-07-01

    The tetracarboxylic derived of the para-ter-butylcalix[4]arene (B{sub 4}ACEbL{sup 4}) does not exist commercially for what was synthesized and characterized at laboratory level. The separation of the L-tyrosine amino acid was studied by means of a solid-liquid extraction system with the B{sub 4}ACEbL{sup 4} as solid phase, in function of ph (2.5-7.5) and contact time (5 and 15 hours) to temperature of 15-17 grades C. Resulted that the ph and the contact time were decisive in the extraction percentage of water tyrosine. The lowest percentage was 49% to ph 4 and the highest percentage was 61% to ph 7.5 with 15 hours of contact. In a contact time of 5 hours the extraction was inferior to 32% (ph 4) and of 47% to ph 6.5. The europium effect (Eu (III)) was studied to ph acid in the tyrosine separation and was found that the tyrosine extraction is not increased neither decomposes in europium presence, this is simultaneously extracted by the calixarene but it does not enter in competition for the calixarene with the amino acid. The separate solid phases: calixarene-tyrosine was analyzed by Far infrared radiation (Fir), Mid-Infrared (Mir) spectroscopy and luminescence to check the tyrosine presence in the separate solids as well as the nature of the connection calixarene-tyrosine. In this way was possible to check the tyrosine presence and to propose the formed molecular species tyrosine-calixarene, those which interact mainly by means of hydrogen connections and Van der Waals forces. The liquid phases before and after the extraction were analyzed by UV-Vis spectrophotometry and luminescence. The Neutron activation analysis was used to determine the europium content in the solid and liquid phases of extractions in europium presence. The tyrosine degradation also shows dependence with the ph, obtaining 88% degradation to the 24 hours to ph 7.5, while to ph 3 is degraded the 54% of tyrosine present in the sample. The europium presence does not affect the tyrosine extraction but if its photo catalytic degradation, since increases the tyrosine degradation to 85% to ph 3. The solid-liquid system used for separating L-tyrosine of water to sour ph, neutral and basic as well as the system used for its photo catalytic degradation suggests its possible application in the waters decontamination containing tyrosine and its metabolites. Of course that before using as alternative the studied system, a thorough study of the same system will be required and with other parameters that could affect so much in the tyrosine separation as in its photo catalytic degradation. (Author)

  13. The system uranyl nitrate-dietyl ether-water. Extraction by water in spray and packed columns from uranyl nitrate-either solutions; El sistema nitrato de uranilo-eter dietilico-agua, extraccion de nitrato de uranilo con agua a partir de disoluciones etereas en columnas de pulverizacion y de relleno

    Energy Technology Data Exchange (ETDEWEB)

    Perez Luina, A.; Gutierrez Jodra, L.

    1960-07-01

    This paper is a continuation of the one published in Chemical Engineering Progress. Symposium Series, 50, n. 12, 127 (1954). New runs for spray columns, are given and other concentrations in uranyl nitrate for the packed columns. New correlations for the overall H.T.U. are also given. The individual H.T.U. have been grapycally calculated and show that the film resistances have similar values, being independent of the concentration of the ether phase. (Author) 24 refs.

  14. Extraction of toxic and valuable metals from wastewater sludge and ash arising from RECICLAGUA, a treatment plant for residual waters applying the leaching technique; Extraccion de metales toxicos y valiosos de los desechos de lodos y cenizas provenientes de la planta tratadora de aguas residuales RECICLAGUA aplicando la tecnica de lixiviado

    Energy Technology Data Exchange (ETDEWEB)

    Guerrero D, J.J

    2004-07-01

    Presently work, the technique is applied of having leached using coupled thermostatted columns, the X-ray diffraction for the identification of the atomic and molecular structure of the metals toxic that are present in the residual muds of a treatment plant of water located in the municipality of the Estado de Mexico, RECICLAGUA, likewise the techniques is used of Inductively Coupled Plasma Mass Spectroscopy and X-ray fluorescence analysis for the qualitative analysis. We took samples of residual sludge and incinerated ash of a treatment plant waste water from the industrial corridor Toluca-Lerma RECICLAGUA, located in Lerma, Estado de Mexico. For this study 100 g. of residual of sludge mixed with a solution to 10% of mineral acid or sodium hydroxide according to the case, to adjust the one p H at 2, 5, 7 and 10, bisulfite was added, of 0.3-1.5 g of dodecyl sulfate of sodium and 3.93 g of DTPA (triple V). Diethylene triamine penta acetate. These sludges and ashes were extracted from toxic and valuable metals by means of the leaching technique using coupled thermostated columns that which were designed by Dr. Jaime Vite Torres, it is necessary to make mention that so much the process as the apparatus with those that one worked was patented by him same. With the extraction of these metals, benefits are obtained, mainly of economic type, achieving the decrease of the volume of those wastes that have been generated; as well as the so much use of those residuals, once the metals have been eliminated, as of those residuals, once the metals have been eliminated, as of those liquors, the heavy metals were extracted. It was carried out a quantitative analysis using Icp mass spectroscopy, this way to be able to know the one content of the present metals in the samples before and after of leaching them, these results reported a great quantity of elements. Another of the techniques employees was the analysis by X-ray diffraction that provides an elementary content of the samples, identifying elements that are present in concentrations greater to 0.5% in weight, as long as the spectroscopy analysis of emission for plasma very low concentrations are identified already that this method causes the destruction of the sample achieving the identification of all the present elements. With the obtained results we are able to compare the concentrations of the metals before and after the leaching. We calculate by this way the percentage of efficiency for each one of the variables that we managed in the development of the study, achieving the extraction of those toxic and valuable metals, present in the sludge and ashes until of 100%. Based on the results we can mention that the workers who are exposed to aerosols and powders of these toxic residuals those which they contain heavy metals. (Author)

  15. Study of the extraction of residual heat for a steam generator in the presence of incondensables modeling with TRACE: PKL experiment III G1.1; Estudio de la extraccion del calor residual por un generador de vapor en presencia de incondensables modelado con TRACE: experimento PKL III G1.1

    Energy Technology Data Exchange (ETDEWEB)

    Berna, C.; Escriva, A.; Munuz-Cobo, J. L.; Romero, A.

    2012-07-01

    This paper made the simulation of the PKL III G1.1 experiment using SNAP interface and the TRACE code. This experiment aims to essentially the study of the extraction of the residual heat of the steam generator in the presence of gases incondensables.

  16. Increasing of the efficiency of energetic production by leachating control and biogas extraction in municipal waste sanitary landfills; Incremento del rendimiento de produccion energetica mediante sistema simultaneo de control de lixiviados y extraccion de biogas en vertederos de R.S.U.

    Energy Technology Data Exchange (ETDEWEB)

    Martinez Carrillo, J.

    2000-07-01

    A new practice have been introduced to combat the problems in dual extraction, leachate and biogas, where the leachate is pumped directly from the gas extraction well. Using dual extraction, leachate levels can be kept to a minimum, LFG extraction increased and methane content improved for electricity production. (Author)

  17. Study of the leaching of heavy metals from waste water sludge and incinerator's ash, using coupled thermostated columns and DTPA as complex agent; Estudio de la extraccion de metales pesados de lodos y cenizas de aguas residuales usando columnas termostatizadas acopladas y DTPA como agente complejante

    Energy Technology Data Exchange (ETDEWEB)

    Vite T, J.; Vite T, M.; Guerrero D, J.; Carreno de Leon, M.C. [Departamento de Estudios del Ambiente, Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    2000-07-01

    We studied the metallic composition from waste water sludge and incinerators ashes of an incinerator located in Toluca, Mexico, the qualitative studies were made using the Activation Analysis technique, and fluorescence X-ray techniques. The quantitative analysis of heavy metals in the wastes were made using Inductively coupled plasma atomic emission spectrometry (Icp-Aes). For leaching the samples, we used four coupled thermostated columns, each one had a p H of 2,5, 7 and 10. The flux of the air was of 1600 cc/min. The temperature was maintain constant in 60 Centigrade using a thermostated system. For this study we used 100 g of wastes mixed with mineral acid or sodium hydroxide to reach p H 2,5,7 and 10. We added a reducing and tensoactive agents and finally DTPA as complex agent. With this method, we obtain a better leaching efficiency using a complex agent. However the high DTPA cost, make this process expansive that is why we recommend to work with another classes of complex agents, that be cheaper to leach metals of different chemistry matrix. (Author)

  18. Determination of traces of uranium in sea water after separation by froth flotation

    International Nuclear Information System (INIS)

    Uranium in sea water is separated by froth flotation of the uranium (VI)-Arsenazo III-Zephiramine ion-adduct and then determined by neutron activation or spectrophotometric method using the uranium(IV)-Arsenazo III complex. Results of the analysis of Pacific coastal samples by the two methods are in good agreement; an average value of 3.0μg U/per liter was obtained. (author)

  19. 4,6-二溴偶氮胂分光光度法测定痕量稀土的研究%Study on the Spectrophotometric Determination of Trace Rare Earths in Human Hair with 4,6-dibromo-arsenazo

    Institute of Scientific and Technical Information of China (English)

    陈雪松

    2004-01-01

    研究了4,6-二溴偶氮胂与稀土的显色反应.结果表明,在pH 1.8的氯乙酸-氢氧化钠缓冲介质中,RE3+与4,6-二溴偶氮胂形成1∶2稳定的紫红色络合物,其最大吸收波长为640 nm,表观摩尔吸光系数ε=1.2×105,稀土量在0~2 μg/mL范围内符合比尔定律.该法用于人发中0.0005%~0.0050%稀土含量的测定,结果满意.

  20. Kinetic spectrophotometric determination of trace thallium(Ⅲ) based on the discoloring reaction of arsenazo M by oxidation of potassium bromate%溴酸钾氧化偶氮胂M褪色动力学光度法测定痕量铊(Ⅲ)

    Institute of Scientific and Technical Information of China (English)

    周之荣; 张纪文; 周瑜芬; 魏家文

    2006-01-01

    基于0.08 mol/LH2SO4介质中,痕量铊(Ⅲ)催化溴酸钾氧化偶氮胂M(AsAM)的褪色反应,建立了测定痕量铊(Ⅲ)的催化光度法.讨论了酸度、反应物浓度、反应温度、时间、干扰离子等因素的影响.研究了反应的最佳条件,并测定了一些动力学参数,催化反应的表观活化能为70.12kJ/mol.方法检出限为0.17μg/L,线性范围为0~20 μg/L.在25 mL溶液中,测定0.5μg铊(Ⅲ)的相对标准偏差为3.4%(n=11).结合溶剂萃取分离技术,用于测定废水及土壤样品中痕量铊(Ⅲ),回收率为97.0%~103.0%.

  1. KINETIC SPECTROPHOTOMETRIC DETERMINATION OF TRACE VANADIUM(V) BASED ON DIS COLORING OF ARSENAZO M OXIDIZED BY POTASSIUM PERIRODATE%高碘酸钾氧化偶氮胂M褪色光度法测定食品中的痕量钒

    Institute of Scientific and Technical Information of China (English)

    王黎; 周之荣

    2006-01-01

    基于0.08mol/L的H2SO4介质中,痕量钒(V)催化高碘酸钾氧化偶氮胂M的褪色反应,建立了测定痕量钒(V)的催化动力学光度法.方法检出限为0.17μg/L,线性范围为0.0~8.0μg/L.用于测定食品中的痕量钒(V),结果满意.

  2. Una metodología para el estudio de las ideas previas sobre química a través del análisis de expresiones gráficas

    Directory of Open Access Journals (Sweden)

    Didier L. Ruíz

    2015-01-01

    Full Text Available Se examinaron las respuestas gráficas de hombres y mujeres jóvenes, de 17 años en promedio, inscritos en cursos de nivelación en ciencias. Se encontró que predominan en toda la población alusiones a material de laboratorio y a experimentos. La categoría denominada Iconos/Iconemas (representaciones de sensaciones o sentimientos, o figuras geométricas aisladas aparece con frecuencia en la población de 17 años. Los análisis muestran que el porcentaje de población que incluye el cuerpo humano en sus expresiones nunca es superior al 30 %. Cuando aparecen figuras humanas sus escenarios dejan ver que son experimentadores, no se muestra el cuerpo humano como parte del estudio químico. Al indagar sobre la orientación vocacional, se encontró que los hombres prefieren carreras científicas y las mujeres optan por programas del área de la salud. El artículo concluye que es posible indagar y analizar la percepción esencial sobre el área de la química gracias al estudio de expresiones gráficas y considerar correspondencias entre edad, sexo y orientación vocacional. Esta información es útil tanto para planear y orientar las actividades de aula, como para inquirir paradigmas y concepciones, y establecer el grado de abstracción y el conocimiento de los estudiantes sobre el alcance y la aplicabilidad de la química.

  3. Absorción de grasas termoxidadas. I. Reproducibilidad y exactitud de las técnicas analíticas previas a la evaluación de los lípidos no absorbidos

    Directory of Open Access Journals (Sweden)

    Márquez-Ruiz, G

    1991-02-01

    Full Text Available Reproducibility of the techniques used for isolation and separation of non-absorbed lipids present in feces from rats fed with diets containing heated oils are defined. Highly reproducible results have been found for total lipids, nonpolar fatty acid compositions. Results obtaines from extracted diets demonstrate both the absence of significant alteration and the complete extraction of the fat when compared to those obtained directly from the oils. Non-absorbed lipids from diets containing thermoxidized oils are characterized by high proportions of unsaponifiable compounds and polar fatty acids.

    Se estudia la exactitud y reproducibilidad de las técnicas analíticas utilizadas en la extracción y separación de lípidos no absorbidos presentes en las heces de ratas Wistar alimentadas con dietas conteniendo aceites termoxidados. Se ha encontrado una reproducibilidad muy elevada en la cuantificación de lípidos totales, ácidos grasos no polares y composición en ácidos grasos. Por otra parte, la comparación de los lípidos extraídos de las dietas con sus correspondientes aceites de partida, demuestra en primer lugar una total recuperación de la grasa en el proceso de extracción y en segundo ausencia de alteración significativa durante el mismo. Los lípidos no absorbidos se caracterizan por un elevado contenido en ácidos grasos polares y compuestos no saponificables.

  4. Preliminary simulation of implants breast through the accelerated partial irradiation technique: coverage rates and homogeneity; Simulacion previa de implates de mama mediante la tecnica de irradiacion parcial acelerada: indices de cubrimiento y homegeneidad

    Energy Technology Data Exchange (ETDEWEB)

    Moral Sanchez, S. C.; Paula Carranza, B. de; Erzibengoa, M.; Bragado Alvarez, L.; Guisasola Berasetegui, A.

    2013-07-01

    In this work we present and evaluate the process of pre-simulation we have drawn up when it comes to treatments of accelerated partial irradiation of breast. Previous simulation that we will allow you to have greater control over the location of catheters with respect to the area to radiate. The goodness of this procedure is evaluated through representative quality indexes of the implant. (Author)

  5. Regadíos y gestión sostenible de los recursos hídricos en la cuenca del Guadiana: propuesta territorial previa a la toma de decisiones

    OpenAIRE

    Ruiz Pulpón, Ángel Raúl

    2006-01-01

    La expansión de la agricultura de regadío ha ocasionado una significativa conflictividad ecológica, económica y social concerniente al uso del agua en la cuenca del Guadiana. Ante la ausencia, en estos últimos treinta años, de enfoques territoriales y sistémicos para la resolución de la problemática, se propone una metodología que permite la clasificación territorial de los municipios de la cuenca hidrográfica del Guadiana que presenten unas características similares de sus reg...

  6. La materialidad en auditoría como barrera hacia la comparabilidad de la información financiera: una revisión de la investigación empírica previa

    OpenAIRE

    Francisco Javier Martínez García; Ana Fernández Laviada; Javier Montoya del Corte

    2007-01-01

    Iniciativas como las Normas Internacionales de Contabilidad e Información Financiera (NIC/NIIF), así como las Normas Internacionales de Auditoría (NIA) suponen un gran impulso hacia la armonización de la información corporativa. No obstante, en su proceso de implantación encontramos ciertas imprecisiones que vienen existiendo desde hace décadas; una de ellas es la aplicación del concepto de materialidad en contabilidad y auditoría. El objetivo de este trabajo es demostrar, a tr...

  7. PRENTAL DIAGNOSIS OF CREATINE KINASE DETECTION IN PERNICIOUS PLACENTA PREVIA%凶险型前置胎盘孕妇肌酸激酶检测的产前诊断价值

    Institute of Scientific and Technical Information of China (English)

    周晓

    2014-01-01

    目的:通过比较孕晚期凶险型前置胎盘孕妇和正常妊娠孕妇血清中肌酸激酶的差异,探讨其用于凶险型前置胎盘合并胎盘植入产前诊断的价值。方法回顾性分析2012年6月至2013年6月江西省妇幼保健院凶险型前置胎盘单胎孕妇92例,其中合并胎盘植入者38例,归入凶险型前置胎盘合并胎盘植入组,其余54例归入未合并胎盘植入组,再随机抽取同期分娩的既往有剖宫产史,本次为正常妊娠的孕妇50例作为对照组,比较三组孕妇血清肌酸激酶水平的差异。结果凶险型前置胎盘合并胎盘植入组CK数值为(128.6±19.8)U/L,未合并胎盘植入组为(67.7±21.2) U/L,单纯剖宫产史组为(65.1±20.3) U/L。凶险型前置胎盘合并胎盘植入时,孕妇血清肌酸激酶水平明显升高,差异具有统计学意义。而在中央型前置胎盘、部分型前置胎盘和边缘型前置胎盘中,肌酸激酶分别为(80.3±38.2) U/L、(77.1±36.0) U/L、(79.6±29.7) U/L,三者差异无统计学意义。结论孕妇血清肌酸激酶的测定对凶险型前置胎盘合并胎盘植入的产前预测有价值,与前置胎盘的类型无关。%Objective:Through comparing the content difference of serum creatine kinasebetween pregnant women with pernicious placenta priva and the normal ones to investigate its value in prenatal diagnosing pernicious placenta priva with placenta accreta.Methods:A total of 92 patients of pernicious placenta priva were retrospectively analyzed in Maternal and Child Care Service Centre of Jiangxi Province from June 2012 to June 2013, among them, 38 cases of pernicious placenta priva with placenta accrete after operation were classified into the study group with placenta accreta, others into the study group without placenta accrete, then 50 women having caesarean section ever but normal pregnance this time into the control group. The levels of serum creatine kinase among three groups were compared.Results:The levels of creatine kinase in study groups with placenta accreta, without placenta accreta and controls were (128.6 ± 19.8) U/L, (67.7 ± 21.2) U/L and (65.1 ± 20.3) U/L respectively. The level of the study group with placenta accreta was the highest of all. But the levels for central placenta priva, partial placenta priva and marginal placenta priva were(80.3 ± 38.2) U/L,(77.1 ± 36.0) U/L and(79.6 ± 29.7) U/L respectively, the difference among them was not statistically significant. Conclusion:The level of creatine kinase may be helpful to predict placenta accreta prenatally, which is unrelated to the type of placenta accreta.

  8. Una comparación de la selección de los ratios contables en los modelos contable-financieros de predicción de la insolvencia empresarial : la literatura previa frente al analisis factorial

    OpenAIRE

    Somoza López, Antonio; Vallverdú Calafell, Josep

    2003-01-01

    En los últimos 30 años la proliferación de modelos cuantitativos de predicción de la insolvencia empresarial en la literatura contable y financiera ha despertado un gran interés entre los especialistas e investigadores de la materia. Lo que en un principio fueron unos modelos elaborados con un único objetivo, han derivado en una fuente de investigación constante. En este documento se formula un modelo de predicción de la insolvencia a través de la combinación de diferentes variables cua...

  9. The management of pernicious placenta previa with stillbirth and lethal fetal malformations%凶险型前置胎盘合并死胎及致死性胎儿畸形的处理

    Institute of Scientific and Technical Information of China (English)

    廖轶尼; 应豪

    2014-01-01

    凶险型前置胎盘严重威胁孕产妇生命安全.虽然凶险型前置胎盘的同时发生死胎或者致死性胎儿畸形的发生率极低,但其对孕妇生命安全有巨大威胁,给产科医生临床处置带来了极大的挑战.对于相关情况的处理,目前仍缺乏一致认可、成熟的临床处置规范.文章就此类情况产前诊断、产前准备及产时处理进行相关探讨.

  10. Pocket book {sup E}xpectations of operating personnel action and card criteria, previous meeting and precursor of error; Libro de bolsillo expectativas de actuacion del personal de operacion y tarjeta criterios reunion previa y precursores de error

    Energy Technology Data Exchange (ETDEWEB)

    Rodrigo Gonzalez, M.

    2012-07-01

    We have developed a pocket manual of performance expectations of operating personnel. Additionally, it has created a card pocket systematizing the application of previous meetings (pre-job) depending on the existence of error precursors and following the commission of an error. This manual serves to communicate expectations and performance expected to the Operation Staff. The results show a positive change in a short period of time working practices, both in training (simulator) and control room.

  11. Territorialidad y autonomía, proyectos minero-energéticos y consulta previa: el caso de los pueblos indígenas de la Amazonía ecuatoriana

    Directory of Open Access Journals (Sweden)

    Fernando García Serrano

    2014-07-01

    Full Text Available From the review of two areas of relative state / indigenous peoples, territoriality, mining and energy projects and consultation, is to analyze the progress, setbacks and dissections lived in this relationshipduring the period 1990-2013, to contribute to the discussion of this problem in other countries experiencing similar circumstancesin Latin America. Of particular importance is the case of Ecuador to the constitutions of 1998 and 2008, in which the multiethnic and multicultural nature of the Ecuadorian State acknowledged at the first, and the plurinational and intercultural character in the second. Likewise, the indigenous movement since its emergence as an actor in national politics since 1990, has not only been a pioneer and leader in the region, but has been challenger extractivismo process carried outby the state.

  12. Evaluación higiénica previa de acrilamida en aire durante la preparación de gel de poliacrilamida (PAA en un laboratorio de genética

    Directory of Open Access Journals (Sweden)

    Antonio Blein Sánchez de León

    2007-06-01

    Full Text Available Objetivos: Conocer el nivel aproximado de concentración en aire de Acrilamida, cancerígeno y mutagénico tipo 2, durante la preparación del gel de Poliacrilamida en el Laboratorio, para verificar si la situación higiénica es tolerable, o si no lo es, para tomar medidas preventivas inmediatamente, antes de llevar a cabo una evaluación detallada con arreglo a UNE-EN 689, con un coste notablemente mayor. Metodología: Una vez seleccionadas las etapas de preparación del gel donde hay emisión de Acrilamida, el método higiénico seguido ha sido el PV2004, de NIOSH, para la toma de muestra y el análisis. Resultados: La concentración de Acrilamida detectada en la fase de pesada es de 723% del Valor Limite de Exposición Profesional para exposición diaria y del 145% del Valor Limite de Exposición Profesional para Corta Exposición. En la fase de agitación no se detecto Acrilamida en la muestra. Conclusiones: Es necesario tomar medidas preventivas inmediatamente. Se proponen varias medidas. Una vez aplicadas, se recomienda realizar la evaluación higiénica según UNE-EN 689.Aims: To know the approximate level of Acrylamide, carcinogenic type 2, in air, during the preparation of Polyacrylamide-Gel in the laboratory, in order to determine if the occupational hygiene situation is acceptable or not, in order to, if not, to implement immediately preventive measurements, before carring out an hygienical assessment following the UNE-EN 689 standard, with much higher costs. Methods: After the selection of the gel-preparation stages, where evaporation of Acrylamide takes place, the followed method was PV2004, from NIOSH, for the sample collection and for the analyse. Results: The detected level of Acrylamide in the weighting stage is 723 % of the TLV-TWAand 145% of the TLV-C. In the stirring stage there was found no Acrylamide. Conclusions: It is necessary to implement immediately preventive measurements. Some of them are proposed. Once implemented it is recommended to carry out an hygienical assessment according to UNE-EN 689.

  13. La materialidad en auditoría como barrera hacia la comparabilidad de la información financiera. Una revisión de la investigación empírica previa.

    OpenAIRE

    Martínez García, Francisco Javier; Fernández Laviada, Ana; Montoya del Corte, Javier

    2007-01-01

    RESUMEN. Iniciativas como las Normas Internacionales de Contabilidad e Información Financiera (NIC/NIIF), así como las Normas Internacionales de Auditoría (NIA) suponen un gran impulso hacia la armonización de la información corporativa. No obstante, en su proceso de implantación encontramos ciertas imprecisiones que vienen existiendo desde hace décadas; una de ellas es la aplicación del concepto de materialidad en contabilidad y auditoría. El objetivo de este trabajo es demost...

  14. Research on the Analysis Method of Micro Concentration of Uranium

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    Spectrophotometric method is used for the analysis of micro concentration of uraninum in aqueousand organic phase in order to test the feasibility of TBP/OK-dimethylbenzene-TTA method for assayingorganic phase and concentrated hydrochloric acid-arsenazo Ⅲ method for assaying aqueous phase. It is

  15. 盐酸利托君治疗妊20-37周先兆流/早产合并前置胎盘孕产妇的护理%Clinical Care in The Use of Ritodrine Hydrochloride to Treat Threatened Miscarriage or Preterm of Pregnant Women at 20-37 Weeks of Pregnancy and Complicating with Placenta Previa

    Institute of Scientific and Technical Information of China (English)

    刘珊珊; 田硕

    2012-01-01

    目的:为了了解前置胎盘与延长盐酸利托君使用时间的关系,了解孕产妇长期大剂量使用盐酸利托君的不良反应与护理方法应对.方法:采用横断面方法,研究对象为我院2008~2011年所有因先兆流/早产入院接受盐酸利托君治疗的患者.结果:先兆流/早产合并前置胎盘的患者占总调查人数的16.2%,与非合并前置胎盘患者在盐酸利托君使用天数上存在明显的统计学差异(P<0.01).结论:前置胎盘与盐酸利托君长时间使用关系密切,且不良反应多,要着重加强该类患者用药期间的观察和护理.

  16. Analysis of influencing factors on massive hemorrhage during elective cesarean section in patients with placenta previa%前置胎盘导致选择性剖宫产产妇大出血的影响因素分析

    Institute of Scientific and Technical Information of China (English)

    王娟; 晋雅凌; 李引弟

    2016-01-01

    目的:探讨前置胎盘导致选择性剖宫产产妇大出血的影响因素。方法选择2004年4月至2014年2月,在延安大学附属医院产科确诊为前置胎盘,并进行选择性剖宫产的105例产妇为研究对象。按照分娩时出血量将其分为大出血(M H )组(n=47,分娩时平均出血量为2054 mL )和非大出血(NMH)组(n=58,分娩时平均出血量为540 mL)。对两组产妇的临床病历资料进行回顾性队列调查研究,统计学比较其年龄、人体质量指数(BMI)、产科史、血红蛋白(Hb)含量、孕期舒张压和收缩压等临床指标差异,采用非条件多因素logistic回归分析法,评估前置胎盘导致选择性剖宫产产妇大出血的独立影响因素。本研究所有研究对象均签署书面知情同意书,并获得延安大学附属医院伦理道德委员会的批准。结果①M H组产妇年龄≥34岁比例及胎盘位于前壁发生率均高于N M H组,而孕期最高舒张压和最高收缩压,则低于NMH组,且上述差异均有统计学意义(P<0.05)。两组产妇其他12项临床指标,包括BM I、首次生育比例、剖宫产史、其他腹部手术史、子宫肌瘤史、孕前Hb含量、孕期吸烟率、单胎妊娠率、住院治疗率、类固醇使用率、剖宫产前 Hb含量及分娩时孕龄比较,差异均无统计学意义(P>0.05)。②非条件多因素logistic回归分析结果显示:产妇年龄≥34岁(OR=2.09,95% C I:1.16~3.71,P<0.05),胎盘位于前壁(OR=2.21,95% C I:1.21~4.03,P<0.05)是前置胎盘导致选择性剖宫产产妇剖宫产时发生大出血的独立危险因素。结论年龄≥34岁及胎盘位于前壁的前置胎盘产妇,在进行选择性剖宫产时发生大出血的风险较高,应加强防范措施。%Objective To explore the influencing factors of massive hemorrhage during elective caesarean section in pregnant woman with placenta praevia .Methods A total of 105 puerperas who were underwent elective caesarean section with placenta praevia in Obstetrics Department of Yan′an University Affiliated Hospital from April 2004 to February 2014 ,were chosen as study objects . According to the blood loss volume during elective caesarean section ,they were divided into massive hemorrhage(MH ) group (n= 47 , the average blood loss volume was 2 054 mL during elective caesarean section) and non‐massive hemorrhage (NMH) group(n=58 ,the average blood loss volume was 540 mL during elective caesarean section ) .Retrospective cohort study was used to research the maternal medical records ,and used statistical method to compare the differences between two groups of puerperas in maternal age ,body mass index(BMI) ,obstetric history ,hemoglobin(Hb) content , the highest diastolic and systolic blood pressure during pregnancy etc .,used unconditional multivariate logistic regression analysis to assess the independent factors for massive hemorrhage during elective caesarean section in pregnant woman with placenta praevia .All subjects of this study have signed the informed consent forms , and got the approval of Yan′an University Affiliated Hospital Ethics Committee .Results ① The proportion of caesarean section maternal age ≥ 34 years old and the incidence rate of placenta located to anterior in M H group were higher than those of NM H group ,but the highest diastolic and systolic blood pressure during pregnancy were lower than those of NM H group ,and all the differences above were statistically significant (P 0 .05 ) .② Unconditional multivariate logistic regression analysis results showed that maternal age ≥ 34 years old(OR=2 .09 ,95% CI:1 .16‐3 .71 , P<0.05) and placenta located to anterior (OR = 2 .21 , 95% CI:1 .21‐4 .03 ,P< 0 .05 ) were independent risk factors of massive hemorrhage during elective caesarean section in pregnant woman with placenta praevia .Conclusions Pregnant women with placenta praevia are more likely to massive hemorrhage during caesarean delivery when age ≥ 34 years old and placenta located to anterior ,so preventive measures should be strengthened .

  17. 36例前置胎盘或伴胎盘植入的磁共振脂肪抑制T2加权成像评价%Evaluation of MR Fat-Suppressed T2-Weighted Imaging in 36 Patients with Placenta Previa or Placenta Increta

    Institute of Scientific and Technical Information of China (English)

    华建军; 蒋春景; 朱碧莲; 楼建义; 范徐妃; 郑秀娟; 蒋晓春; 丁明星

    2015-01-01

    目的:探讨磁共振脂肪抑制T2加权(T2WI)对前置胎盘或伴胎盘植入36例患者的临床评估价值.方法:回顾性分析2012年1月至2013年12月最终确诊为前置胎盘或伴胎盘植入36例患者的临床资料,患者均采用1.5T超导磁共振成像(MRI)成像仪,全腹平扫脂肪抑制T2WI,对其诊断结果与手术及病理检查结果进行比较.结果:MRI诊断中央性前置胎盘27例,部分性前置胎盘4例,边缘性前置胎盘4例和胎盘低置1例,表现为宫颈口高信号影(胎盘组织),均与术后诊断一致;而B超诊断漏诊1例.MRI诊断胎盘植入9例,病理检查证实诊断正确8例,1例误诊;诊断无胎盘植入27例,病理检查证实其中7例有胎盘植入,漏诊7例.MRI诊断前置胎盘伴胎盘植入的敏感度为53.33%,特异度为95.23%,阳性预测值为88.89%,阴性预测值为74.07%.结论:利用磁共振脂肪抑制T2WI可准确诊断前置胎盘,对胎盘植入情况具一定敏感度,可为临床手术治疗提供一定的指导,是B超检查有效的补充手段.

  18. Application of the new requirements of safety of the IAEA for the previous management to the final disposal of radioactive waste in the region: a personal vision; Aplicacion de los nuevos requisitos de seguridad del OIEA para la gestion previa a la disposicion final de desechos radiactivos en la region: una vision personal

    Energy Technology Data Exchange (ETDEWEB)

    Sed, Luis Andres Jova, E-mail: jovaluis@gmail.com [Centro Nacional de Seguridad Nuclear (CNSN), La Habana (Cuba)

    2013-07-01

    The work includes the requirements for the responsibilities associated with the management prior to the final disposal of radioactive waste and as they are referred to in the Region. Also discusses the requirements for the main stages of the management prior to the final disposal of radioactive waste. A very important section of the new requirements is that establish requirements for safe operation of facilities management prior to the final disposal of radioactive wastes and the implementation of activities under conditions of safety and development. The work is emphatic on the importance of safety justification since the beginning of the development of a facility as a basis for the decision-making and approval process. Emphasis is also on the gradual approach which should provide for the collection, analysis and interpretation of the relevant technical data, plans for the design and operation, and the formulation of the justification of the security. This paper gives a personal view of the situation in the Region.

  19. Multinodular goiter treatment with radioiodine aided by recombinant human TSH in different doses: a randomized, double-blind, placebo-controlled study;Administracao previa do TSH humano recombinante, em diferentes doses, no tratamento do bocio multinodular com iodo radioativo: um estudo randomizado, duplo cego, controlado com placebo

    Energy Technology Data Exchange (ETDEWEB)

    Albino, Claudio Cordeiro

    2009-07-01

    Background: There is not an optimal treatment for multinodular goiter (MNG). Surgery is the main therapeutic option because it decreases thyroid volume, reduces compression symptoms and provide histological diagnosis. Radioiodine ({sup 131}I) is an efficient therapeutic option for the treatment of MNG mainly when surgery is not indicated or when the patient refused it. However, high activities of {sup 131}I are frequently required for clinically significant results. This procedure increases the body radiation exposure and the hospitalization costs. Recombinant human TSH (rh TSH) allows a reduction in the administered activity of {sup 131}I with effective thyroid volume (TV) reduction. However, this combination therapeutic can increase collateral effects. Objective: To evaluate the efficacy and safety of low and intermediate doses of rh TSH compared to placebo, associated with a fixed activity of {sup 131}I in MNG treatment. Patients and Methods: Thirty patients with MNG received 0.1 mg of rh TSH (group I, n=10), 0.01 mg of rh TSH (group II, n=10), or placebo (control group, n=10). After 24 hours, 30 mCi of {sup 131}I was given to all patients. Radioactive iodine uptake (RAIU) was determined before and 24 hours after rh TSH. Before and 2, 7, 180 and 360 days after the TV was measured by magnetic resonance image (MRI). The smallest cross-sectional area of tracheal lumen (Scat) was also measured with MRI before, 2 and 7 days after treatment. Antithyroid antibodies, TSH, T3 and free T4 were assessed regularly. Results: After 6 months, the decrease in TV was more significant in groups I (30.3 +- 16.5%) and II (22.6 +- 14.5%), than in control group (5.0 +- 14.6%; p=0.01). After 12 months, TV decreased more in group I (39.2 +- 16.9%) and group II (38.8 +- 24.4%) than in group III (23.4 +- 23.59%) but it was not statistically significant (p=0.205). During the first 30 days,total T3 and free T4 increased, without reaching thyrotoxic levels and TSH decreased. After 12 months, 8 patients developed hypothyroidism (3 in group I, 3 in group II and 2 in group III). Anti-thyroglobulin antibodies (anti-TG) titers increased after 6 months and returned to basal levels after 12 months similarly in all groups. There was more patients with anti-thyroperoxidase antibodies (anti-TPO) titers increased after 12 months on group I. There was not TV increase after {sup 131}I on the first week ,with or without rh TSH. Conclusion: The previous stimulus with rh TSH using a fixed {sup 131}I activity lead to a greater and more significant goiter reduction after six months of treatment than {sup 131}I alone. After twelve months this tendency was maintained, but without statistic relevance. (author)

  20. Optical apparatus and method for sensing uranyl

    Science.gov (United States)

    Baylor, L.C.; Buchanan, B.R.

    1994-01-01

    An optical sensing device for uranyl and other substances, a method for making an optical sensing device and a method for chemically binding uranyl and other indicators to glass, quartz, cellulose and similar substrates. The indicator, such as arsenazo III, is immobilized on the substrate using a chemical binding process. The immobilized arsenazo III causes uranyl from a fluid sample to bind irreversibly to the substrate at its active sites, thus causing absorption of a portion of light transmitted through the substrate. Determination of the amount of light absorbed, using conventional means, yields the concentration of uranyl present in the sample fluid. The binding of uranyl on the substrate can be reversed by subsequent exposure of the substrate to a solution of 2,6-pyridinedicarboxylic acid. The chemical binding process is suitable for similarly binding other indicators, such as bromocresol green.

  1. Restoration effect on vegetation dynamics in the peatland communities of the Ebro Reservoir surroundings (Burgos, Spain)

    OpenAIRE

    Juan Ovejero, Raquel

    2014-01-01

    Las turberas representan un hábitat espacialmente restrictivo en España y albergan una flora muy valiosa con varias especies raras (Myrica gale, Sphagnum spp., Eriophorum angustifolium, Drosera rotundifolia). Las turberas del norte de España se han visto especialmente afectadas por un uso humano intensivo y han sido drenadas para posteriores extracciones de turba o simplemente han desaparecido tras el desarrollo urbano e industrial. Son valiosos ecosistemas que comúnmente no tienen un buen e...

  2. La mineria en Galicia: analisis economico cuantitativo.

    OpenAIRE

    Rodriguez, X.A.

    1995-01-01

    Los romanos consideraban a Galicia como un "coto minero" de especial relevancia para el Imperio, por sus ricos yacimientos de oro, plata, hierro, cobre, estaño, plomo... que poblaban su territorio. En el contexto de las dos Guerras Mundiales, y con finalidades belicas, adquieren importante protagonismo las extracciones gallegas de wolframio y estaño. En la actualidad la "vocacion" minera de esta Comunidad, dentro de lo que se dio en llamar la "nueva mineria" (productos de cantera y minerales ...

  3. Testing of IAEA standard reference materials by Research and Development Institute, Czechoslovak Uranium Industry

    International Nuclear Information System (INIS)

    The Institute have partaken of attestations for a number of years. It has thus obtained a number of reference materials and could completely test the accuracy of the analytical methods used. The materials being tested included uranium and thorium ores, milk, whey, sea sediments and algae. The methods used included X-ray fluorescence analysis, high resolution gamma spectrometry, atomic absorption spectrometry, radiometric methods. Uranium was determined by spectrophotometry using Arsenazo III. (M.D.). 2 tabs., 17 refs

  4. Intracellular pH changes induced by calcium influx during electrical activity in molluscan neurons

    OpenAIRE

    1980-01-01

    Simultaneous measurements of electrical activity and light absorbance have been made on nerve cell bodies from Archidoris monteryensis injected with indicator dyes. pH indicators, phenol red and bromocresol purple, and arsenazo III, which under normal conditions is primarily a calcium indicator have been employed. Voltage clamp pulses which induced calcium influx caused an absorbance decrease of the pH dyes indicating an internal acidification. The onset of the pH drop lagged the onset of Ca2...

  5. Placental localization by scanning with indium 113m

    Energy Technology Data Exchange (ETDEWEB)

    Choi, Seung Wook; Choe, Yong Kyu; Choi, Byung Sook [Yonsei University College of Medicine, Seoul (Korea, Republic of)

    1972-09-15

    The application of radioactive tracers for placental localization has been introduced as the worthwhile diagnostic method in placenta previa. Recently {sup 113m}In has been applied as the broad spectrum agent for the visualization of various organs. The advantage of {sup 113m}In are a short half-life with 1.7 hours and no beta particle emission. During the period from May 1970 to August 1971, the placental scanning with {sup 113m}In was carried out at Yonsei Medical Center on 19 cases of Korean pregnant females who had painless vaginal bleeding with suspicious placenta previa or other placental lesions, clinically. Followings are the results of placental scanning with Indium-113m. 1) Eight cases out of 19 cases were suggested as placenta previa and the remaining 11 cases were turned out to be normal placental location. 2) Among these 8 case of positive scanning, placenta previa totalis was 6 cases, placental previa partialis was 1 case and placenta previa marginalis was also 1 case. 3) Among 11 cases of normal placental localization, right side placenta was 7 cases and left side, 4 cases. The placental scanning with Indium-113m is thought to be one of the simple, safe and rapid method with high accuracy for clinical diagnosis of the placenta previa and placental localization.

  6. Extraction of oil from pequi fruit (Caryocar Brasiliense, Camb. using several solvents and their mixtures

    Directory of Open Access Journals (Sweden)

    Antoniassi, R.

    2011-09-01

    Full Text Available In this study, the oil extraction process from pequi pulp using different solvents (hexane, acetone and ethyl alcohol and their mixtures was investigated, using a simplex-centroid design. The extraction occurred at 50°C, under stirring (22 Hz, for 16 hours. The solid-liquid ratio used was 1:10 (w/w. Higher yield values were obtained for extractions with acetone and hexane, especially their mixtures with ethanol. Iodine value, saponification value and refractive index did not differ significantly among the treatments. A higher acid value was obtained for the extraction with ethyl alcohol. Higher carotenoid contents were obtained for the extraction with acetone and ethyl alcohol as pure solvents. The fatty acid profile in the oil fraction of the extracts did not vary among the different types of solvents and their mixtures.En este trabajo fue estudiado el proceso de extracción de aceite de la pulpa de pequi utilizando diferentes disolventes (n-hexano, acetona y etanol y sus mezclas, empleando diseño central simplex. Las extracciones fueron realizadas a 50°C, durante 16 horas de agitación (22 Hz. La proporción sólido:líquido empleada fue 1:10 (p/p. Los mayores rendimientos fueron obtenidos para las extracciones con acetona y con hexano, especialmente cuando fueron mezclados con etanol. El índice de yodo, el índice de saponificación y el índice de refracción no difirieron significativamente entre los tratamientos. Los mayores valores de acidez se obtuvieron en la extracción con etanol. Los mayores contenidos en carotenoides se obtuvieron en las extracciones con acetona y etanol como disolventes puros. El perfil de los ácidos grasos en las fracciones de aceite de los extractos no presentó variación entre los diferentes tipos de disolventes y sus mezclas.

  7. Role of MRI versus ultras

    Directory of Open Access Journals (Sweden)

    Lamiaa Bassam Hashem

    2016-06-01

    Conclusion: Magnetic resonance imaging is complementary to Ultrasound and it is important for the accurate diagnosis of placental abnormalities especially placenta previa and the seriously co-existing placenta accreta.

  8. Medline Plus

    Full Text Available ... not dilate to 10 centimeters If the mother has placenta previa, where the placenta is blocking the ... the mother will remain awake. If the baby has to be delivered quickly, as in an emergency, ...

  9. C-section

    Science.gov (United States)

    ... 2010:chap 25. Read More Eclampsia Placenta abruption - definition Placenta previa Preeclampsia Your baby in the birth ... M. is also a founding member of Hi-Ethics and subscribes to the principles of the Health ...

  10. Extracción de plaguicidas en suelo empleando dióxido de carbono supercrítico-cosolventes

    OpenAIRE

    Jose Forero; Henry Castro; Jairo Guerrrero

    2010-01-01

    En este estudio se evaluó la eficiencia de tres solventes orgánicos (acetato de etilo, metanol y acetona) empleados como cosolventes en la extracción con fluidos supercríticos (EFS) de una mezcla de plaguicidas con diferentes características fisicoquímicas. Los análisis se realizaron por medio de cromatografía de gases con detección simultánea por microcaptura electrónica (_ECD) y nitrógeno-fósforo (NPD) acoplados en paralelo. Se hicieron extracciones a muestras de suelo fortificadas con los ...

  11. Razonamiento terapéutico en un caso de protrusión de incisivos superiores. Caso clínico

    OpenAIRE

    Carazo, S.; Carrière Lluch, Luis; Higuera, Blanca de la; Escuin, M. J.; Ustrell i Torrent, Josep Maria, 1953-

    1994-01-01

    El caso estudiado corresponde a una niña de 13 años y 1 mes, que acude a la consulta de ortodoncia por una ligera protrusión de incisivos superiores. Presenta una oclusión de clase I, molar y canina, y clase I esquelética. Con una discrepancia inferior de 4 mm, un patrón de crecimiento dólico, y un perfil recto con el surco supramentoniano borrado. Ante una paciente de estas características se nos plantean diversas posibilidades de tratamiento, con o sin extracciones, e incluso la posibilidad...

  12. Método integral para mejorar el diseño de columnas de destilación, a partir de conceptos de ahorro de energía

    OpenAIRE

    Marco Antonio Ponce Guerrero; Daniel Salazar Sotelo

    2001-01-01

    Se presenta una metodología para analizar esquemas de destilación y proponer modificaciones que signifiquen ahorros de energía, mediante el uso de curvas de entalpía-temperatura que relacionan la operación simulada con el caso de una operación ideal reversible, tal como lo proponen Dhole y Linhoff. Se hace una aplicación a una columna de destilación atmosférica de crudo, que presenta un arreglo complejo con pumparounds y extracciones laterales. El resultado de adicionar un pumparo...

  13. Los recursos hidráulicos en el Canal de Navarrés-Enguera

    OpenAIRE

    Morell Evangelista, Ignacio; Sanchís Moll, E.

    1985-01-01

    En el contexto general del sistema hidrogeológico del Macizo del Caroch se individualizan los recursos hidráulicos de la comarca de la Canal de Navarrés-Enguera. La procedencia del agua utilizada en la comarca estudiada es mayoritariamente subterránea, sin que se observen síntomas de sobreexplotación, siquiera puntuales. La influencia de las extracciones por bombeo sobre los manantiales puede considerarse como un mecanismo de regulación hiperanual. El modo óptimo de explotación de los recurso...

  14. Aproximación de la recarga de agua subterránea en el norte del Departamento del Cauca, Colombia

    OpenAIRE

    Cristo Facundo Pérez; Andrés Echeverri-Sánchez; Norberto Urrutia-Cobo

    2016-01-01

    Las aguas subterráneas representan una importante alternativa para el desarrollo de actividades socioeconómicas en regiones donde la oferta de agua superficial no satisface las necesidades o su calidad es deficiente. Sin embargo, su aprovechamiento debe estar en función del conocimiento de su oferta. El norte de Departamento del Cauca es una zona con un importante desarrollo agrícola e industrial, donde se viene presentando extracciones de aguas subterráneas sin conocimiento del volumen of...

  15. Análisis de las acciones colectivas en la gobernanza del agua subterránea en España

    OpenAIRE

    Rica Izquierdo, Marta

    2016-01-01

    El uso de agua subterránea se ha visto en auge en las últimas décadas a escala global, gracias a los avances tecnológicos que han facilitado las extracciones y a los beneficios que aporta este recurso, como resiliencia frente a sequías. Un elemento a veces poco estudiado en el marco del uso intensivo ha sido la ausencia de instrumentos para la gobernanza del agua subterránea, es decir, la falta de herramientas institucionales y normas por parte de las autoridades y de los propios usuarios par...

  16. Laparoscopic management of gossypiboma

    OpenAIRE

    Çetin, Orkun; Çim, Numan; Alkış, İsmet; Kolusarı, Ali; GÜL, Abdülaziz

    2015-01-01

    Introduction:Gossypiboma is a mass lesion due to a retained surgical sponge surrounded by foreign body reaction. We report the laparoscopic management of gossybiboma after caserean section for placenta previa.Case:A 29 year- old women presented with a history of emergency cesarean section for placenta previa, performed seven days ago. Abdominal computerized tomography scan showed a heterogeneous and low dansity mass, with peripheral calcifications. The patient was submitted to laparoscopic su...

  17. Spectrophotometric determination of uranium in liquid waste generated in Fuel Fabrication Plant

    International Nuclear Information System (INIS)

    During fabrication of uranium bearing nuclear fuels, liquid waste is being generated. The liquid waste contains impurities such as Ca, Na, Fe, Ni, Cr etc. The total dissolved solids (TDS) are high, upto 400 gram per litre (gpl). Study has been carried out for spectrophotometric determination of uranium in solution employing Arsenazo-III as metal indicator. The absorbance was measured at 655 nm. For U: Ca ratio 1:10 no interference was observed. For U:Ca ratio of 1:125, uranium concentration was reduced by ∼5%. The method can be applied for determination of uranium in liquid waste generated in fuel fabrication plant. (author)

  18. Determination of uranium and zirconium by flow injection analysis

    Energy Technology Data Exchange (ETDEWEB)

    Sousa, Alvaro S.F. de; Domingues, Maria de L.F.; Rocha, Valeska P. de Araujo; Jesus, Camila S. de, E-mail: alvaro@ien.gov.br, E-mail: valeska@ien.gov.br, E-mail: luma@ien.gov.br, E-mail: camilasaj@gmail.com [Instituto de Engenharia Nuclear (IEN/CNEN-RJ), Rio de Janeiro, RJ (Brazil)

    2013-07-01

    As an integral part of chemical quality control of nuclear materials a method for determination of uranium and zirconium, in a mixture is presented. A simple, cheap, selective and quantitative Flow Injection Analysis (FIA) system was developed. Zirconium and uranium were determinate in presence of each other and no prior separation was needed. Arsenazo III was used as a colorimetric reagent and parameters such as acidity and reagents concentration were studied and optimized. An analytical throughput of 30 sample determination per hour was obtained. (author)

  19. Modified anion-exchange method for determination of thorium in uranium based materials

    International Nuclear Information System (INIS)

    This paper details a modified anion-exchange method for estimation of thorium in uranium based samples like uranium dioxide powders, pellets and uranyl nitrate solutions. The method involves separation of thorium from uranium from 3M commercial grade HCl containing 15% NaCl through an anion-exchange resin. The uranium free effluent containing the analyte(thorium) is determined spectrophotometrically by exploiting absorption of the thorium-arsenazo III complex at 660 nm. The method has a precision of about ±2% at 50 ppm level. (author). 3 refs., 1 tab

  20. Serum Calcium Concentration Is Inversely Associated With Radiographic Knee Osteoarthritis

    OpenAIRE

    Li, Hui; ZENG, CHAO; Wei, Jie; Yang, Tuo; GAO, SHU-GUANG; Li, Yu-Sheng; Luo, Wei; Xiao, Wen-feng; Xiong, Yi-lin; LEI, GUANG-HUA

    2016-01-01

    Abstract To examine the relationship between serum calcium (Ca) concentration and radiographic knee osteoarthritis (OA). This study covered a total of 2855 subjects. The serum Ca concentration was detected by the Arsenazo III method. The radiographic OA of the knee was defined as changes equivalent to Kellgren–Lawrence grade 2 on 1 side at least. The serum Ca concentration was categorized into 4 quartiles, which are ≤2.27, 2.28–2.34, 2.35–2.41, and ≥2.42 mmol/L, respectively. The relationship...

  1. Determination of Trace Titanium by Catalytic Kinetic Spectrophtometry

    Institute of Scientific and Technical Information of China (English)

    ZHAI Qing-zhou; ZHANG Hao

    2007-01-01

    The optimum conditions of discoloring reaction of DBM-arsenazo oxidized by potassium bromate and catalyzed by trace titanium ( Ⅳ ) are studied and a new catalytic-kinetic spectrophotometric method for determination of trace titanium is developed. The linear range of determination of titanium ( Ⅳ ) is 0 - 48 ng/mL at 530 nm. The detection limit of the method is 0.084 ng/mL. The method is used for the determination of titanium in water samples and the analytical results are in excellent agreement with those by atomic absorption spectrometry.

  2. Thorium

    International Nuclear Information System (INIS)

    General mineralogical-geochemical and analytical characteristics of thorium are presented. It is stressed that the main trend in the development of analytical methods for determining Th in mineral raw material is the use of physical methods of the analysis. To separate Th from RE, Zr, U being its permanent companions, precipitation, extraction and ion exchange are used. Principal methods of geologic samples dissolution are considered. Some techniques of radiometric, emanation, (by thoron), neutron activation, fluorescence X-ray spectral, spectrographic, gravimetric, photometric (with arsenazo 3) thorium determinations are described

  3. de riego 03, Valle de Mezquital, Hidalgo, México

    Directory of Open Access Journals (Sweden)

    F. Prieto-García

    2007-01-01

    Full Text Available En este trabajo se realiza el estudio de caracterización fisicoquímica y de extracciones secuenciales selectivas de metales trazas, tóxicos y no biodegradables y el metaloide arsénico, en suelos de la zona Actopan-Ixmiquilpan. La caracterización fisicoquímica se realizó mediante determinaciones de texturas de suelos, materia orgánica, pH, entre otros, para clasificar los suelos; paralelamente se realizaron evaluaciones de extracciones secuenciales selectivas de metales trazas (Pb, Cd, Cr y Hg y del metaloide As, siguiendo el esquema de Tessier et al. (1979, con el fin de correlacionar las características de estos suelos con los tiempos de irrigación, la cual se realiza con aguas negras desde hace más de 20 años (para esta zona. En general se encontró una correlación directa de los tiempos de irrigación con los contenidos de materia orgánica y una acumulación apreciable de Pb y Cr fundamentalmente, que puede acarrear problemas a más largo plazo por contaminación de cultivos.

  4. A novel aeration-assisted homogenous liquid-liquid microextration for determination of thorium and uranium in water and hair samples by inductively coupled plasma-mass spectroscopy.

    Science.gov (United States)

    Veyseh, Somayeh; Niazi, Ali

    2016-01-15

    A novel method based on aeration-assisted homogeneous liquid-liquid microextraction using high density solvent is presented, which is combined with inductively coupled plasma-mass spectroscopy in which simultaneous preconcentration and determination of thorium and uranium with arsenazo III as the chelating reagent is carried out. To achieve optimum conditions, several parameters such as pH, concentration of arsenazo III, extraction and homogenous solvent types and their volumes, salt concentration and extraction time were investigated. Under which, the calibration graphs were linear in the range of 0.5-600.0ng L(-1) for thorium and 0.3-550.0ng L(-1) for uranium. Good linearities were obtained for both analytes with R(2) values larger than 0.9990. The limits of detection (LOD, 3Sb/m, n=5) of this method were 0.12 and 0.09ng L(-1), and the enrichment factors were estimated to be 370 and 410 for thorium and uranium, respectively. The proposed method was applied to determine the thorium and uranium in human hair and different environmental water samples. Acceptable recoveries ranged from 99.4% to 100.7% with standard deviation of 0.05 to 0.17.

  5. A novel aeration-assisted homogenous liquid-liquid microextration for determination of thorium and uranium in water and hair samples by inductively coupled plasma-mass spectroscopy.

    Science.gov (United States)

    Veyseh, Somayeh; Niazi, Ali

    2016-01-15

    A novel method based on aeration-assisted homogeneous liquid-liquid microextraction using high density solvent is presented, which is combined with inductively coupled plasma-mass spectroscopy in which simultaneous preconcentration and determination of thorium and uranium with arsenazo III as the chelating reagent is carried out. To achieve optimum conditions, several parameters such as pH, concentration of arsenazo III, extraction and homogenous solvent types and their volumes, salt concentration and extraction time were investigated. Under which, the calibration graphs were linear in the range of 0.5-600.0ng L(-1) for thorium and 0.3-550.0ng L(-1) for uranium. Good linearities were obtained for both analytes with R(2) values larger than 0.9990. The limits of detection (LOD, 3Sb/m, n=5) of this method were 0.12 and 0.09ng L(-1), and the enrichment factors were estimated to be 370 and 410 for thorium and uranium, respectively. The proposed method was applied to determine the thorium and uranium in human hair and different environmental water samples. Acceptable recoveries ranged from 99.4% to 100.7% with standard deviation of 0.05 to 0.17. PMID:26592585

  6. Complete Hydatidiform Mole Presenting as a Placenta Accreta in a Twin Pregnancy with a Coexisting Normal Fetus: Case Report

    Directory of Open Access Journals (Sweden)

    Marijo Aguilera

    2012-01-01

    Full Text Available A twin pregnancy with a complete hydatidiform mole and a coexisting normal fetus (CHMF is a rare clinical scenario, and it carries many associated pregnancy and postnatal risks. Limited numbers of case studies exist reporting an outcome of live birth, and only three prior cases report the presentation of a hydatidiform mole as a placenta previa. We report a case of CHMF with the molar component presenting antenatally as a placenta previa, which ultimately resulted in placenta accreta at the time of delivery. A live male infant was delivered at 34 weeks’ gestation via planned cesarean section, and a hysterectomy was performed following unsuccessful removal of the molar component. We additionally utilized previously described methods of placing internal iliac balloons and ureteral stents prior to delivery. In such a high-risk pregnancy with a known molar previa component, these surgical preparation measures may be of benefit.

  7. Localization of placenta in scanning by /sup 113m/In radiopharmaceuticals

    Energy Technology Data Exchange (ETDEWEB)

    Cho, O.K.; Oh, K.K.; Park, C.Y.; Choi, B.S.; Ha, C.H.; Chung, S.O.; Kwak, H.M.

    1975-01-01

    Placenta previa is a common grave complication of late pregnancy, usually manifestated clinically by painless antenatal vaginal bleeding. Digital and rectal examinations are dangerous, due to the possibility that profuse hemorrhage from the vagina may result. Various radiological examinations have been performed in placenta previa for diagnosis and localization. However radioisotopic methods are superior due to safety, simplicity and a lower radiation dose, both fetal and maternal, compared to plain radiography. Among radiopharmaceuticals, In/sup 113m/ (transferrin for blood pool scan) is useful, giving more satisfactory results without any complications or untoward reactions.

  8. Business Intelligence & Knowledge Discovery en el contexto del estándar Project Management Body Of Knowledge del Project Management Institute

    OpenAIRE

    Moreno, Juan Pablo; Montejano, Germán Antonio; Vilallonga, Gabriel Domingo

    2016-01-01

    Este trabajo se enfoca en el estudio de la experiencia previa y los elementos de conocimiento que existen en el Project Management Body of Knowledge (PMBOK) perteneciente al Project Management Institute (PMI). Con esta investigación se pretende realizar aportes en el área de Gestión de Proyectos, planteando la necesidad de incorporar buenas prácticas en gestión del conocimiento y experiencias previas, que sirvan de soporte a una mejor gestión de proyectos de cualquier índole y envergadura....

  9. Construcción de conceptos físicos en estudiantes. La influencia del contexto.

    OpenAIRE

    Fernando Flores C.; Leticia Gallegos Cázares

    1999-01-01

    Uno de los aspectos poco analizados en las investigaciones sobre ideas previas y representación conceptual de los estudiantes de física es la influencia que tiene el contexto en la construcción de sus concepciones. En este trabajo se muestra cómo el contexto físico influye en el desarrollo de las ideas previas y la interpretación de los fenómenos físicos de los estudiantes del bachillerato. Se hace notar que esta influencia aparece también en el desarrollo histórico de los conceptos físicos, ...

  10. El regreso a la escuela: evidencias para México

    OpenAIRE

    Guadalupe Fabiola Pérez Baleón; David Philip Lindstrom

    2014-01-01

    El regreso a la escuela es una transición que forma parte de las trayectorias escolares de una parte de la población mexicana. Puede ser un punto de inflexión en la vida de las personas y una estrategia de avance socioeconómico. Los factores positivamente asociados con este retorno son: ser joven, tener una escolaridad previa de secundaria o más, no estar casado, haber vivido en zonas urbanas, tener experiencia migratoria previa, tener padres profesionistas o que se dediquen a actividades no ...

  11. Lixiviación alcalina de las colas de la tecnología carbonato amoniacal para la extracción de aluminio

    Directory of Open Access Journals (Sweden)

    Carmen Hernández-Fernández

    2013-11-01

    Full Text Available Se estudió la termodinámica del proceso de lixiviación alcalina de las colas derivadas del proceso carbonato amoniacal para conocer la espontaneidad de las reacciones y comprobar la posibilidad de extracción del aluminio utilizando como agente lixiviante el hidróxido de sodio (NaOH. Las colas, una vez caracterizadas químicamente, se lixiviaron a escala de laboratorio aplicando un diseño experimental factorial completo. La variación de energía libre indica que es posible extraer aluminio de las colas, lixiviándolas con hidróxido de sodio; para un 45 % de sólido las mayores extracciones se obtienen a 200 ˚C y 30 min. El silicio y el magnesio también mostraron selectividad con el reactivo utilizado

  12. Constituyentes antifungicos en nódulos radicales de alnus acuminata h.b.k.

    OpenAIRE

    Gonzalez, Jaime; Suarez, Margot; Garcés de Granada, Emira; Orozco de Amezquita, Martha

    2011-01-01

    Alnus acuminata. H.B.K. es una especie nativa de importancia económica que se caracteriza por tener nódulos radicalesfijadores de nitrógeno. La composición química de los nódulos no se ha establecido; sin embargo, se ha observado que actúa sobre la microflora del suelo. Con el fin de establecer la composición química de las fracciones obtenidas, se.realizaron extracciones a partir de nódulos de Aliso. Los compuestosaislados 'fueron: xilosa y ribosa; además se caracterizaron un ácido carboxíli...

  13. Optimización de un protocolo de extracción de ADN genómico para Pinus tecunumanii

    Directory of Open Access Journals (Sweden)

    David A. Cerda-Granados

    2013-05-01

    Full Text Available Se optimizó un protocolo para la extracción de ADN genómico de Pinus tecunumanii basado en el método de extracción de Doyle y Doyle (1990. Se probaron los megagametofitos de las semillas de árboles deP. tecunumanii muestreados en cinco poblaciones naturales de Nicaragua. El método consta de maceración del tejido en tubos Eppendorf, una extracción con bromuro trimetil amonio de cetilo (CTABempleando altas concentraciones de sales, proteinasa K, extracciones sucesivas con cloroformo-alcohol isoamílico y un tratamiento con ARNasa A. El rendimiento fue aproximadamente 13μg de ADN por 58.7 mg de tejido inicial fresco. El ADNgenómico obtenido por este método fue apropiado para ser usado en reaccionesRAPD (ADN polimórfico amplificado al azar

  14. Método integral para mejorar el diseño de columnas de destilación, a partir de conceptos de ahorro de energía

    Directory of Open Access Journals (Sweden)

    Marco Antonio Ponce Guerrero

    2001-01-01

    Full Text Available Se presenta una metodología para analizar esquemas de destilación y proponer modificaciones que signifiquen ahorros de energía, mediante el uso de curvas de entalpía-temperatura que relacionan la operación simulada con el caso de una operación ideal reversible, tal como lo proponen Dhole y Linhoff. Se hace una aplicación a una columna de destilación atmosférica de crudo, que presenta un arreglo complejo con pumparounds y extracciones laterales. El resultado de adicionar un pumparound muestra una reducción en los consumos de energía, del orden de 400 millones de BTU/día, comprobando la utilidad de los métodos de análisis de procesos que utilizan la simulación.

  15. Current status of the Colombia power plants emissions; Estado de las emisiones en las centrales termoelectricas de Colombia

    Energy Technology Data Exchange (ETDEWEB)

    Quijano Hurtado, Ricardo [Ministerio de Minas y Energia, (Colombia)

    1996-12-31

    The characteristics of the Colombian thermal electric resource and the environmental characteristics of the region such as: the climate where the power plants are located; the Geology and the type of soils; the technology employed for the atmospheric emissions control; the water consumption in the region; the systems for ash extraction an social-economical aspects are described [Espanol] Se describen las caracteristicas del parque termico de Colombia y las caracteristicas ambientales de la region como son: el clima donde estan localizadas las plantas; la geologia y los tipos de suelos; la tecnologia utilizada en el control de las emisiones atmosfericas; el consumo de agua en la region; los sistemas de extraccion de cenizas y aspectos socioeconomicos

  16. Chemical, mass spectrometric, spectrochemical, nuclear, and radiochemical analysis of nuclear-grade plutonium nitrate solutions

    International Nuclear Information System (INIS)

    These analytical procedures are designed to show whether a given material meets the purchaser's specifications as to plutonium content, effective fissile content, and impurity content. The following procedures are described in detail: plutonium by controlled-potential coulometry; plutonium by amperometric titration with iron(II); free acid by titration in an oxalate solution; free acid by iodate precipitation-potentiometric titration method; uranium by Arsenazo I spectrophotometric method; thorium by thorin spectrophotometric method; iron by 1,10-phenanthroline spectrophotometric method; chloride by thiocyanate spectrophotometric method; fluoride by distillation-spectrophotometric method; sulfate by barium sulfate turbidimetric method; isotopic composition by mass spectrometry; americium-241 by extraction and gamma counting; americium-241 by gamma counting; gamma-emitting fission products, uranium, and thorium by gamma-ray spectroscopy; rare earths by copper spark spectrochemical method; tungsten, niobium (columbium), and tantalum by spectrochemical method; simple preparation by spectrographic analysis for general impurities

  17. Standard methods for chemical, mass spectrometric, spectrochemical, nuclear, and radiochemical analysis of nuclear-grade plutonium metal

    International Nuclear Information System (INIS)

    Methods are described for the analysis of matrix materials and various impurities in Pu metal. Controlled-potential coulometry, amperometric titration with Fe2+, or titration with ceric sulfate methods are described for the determination of Pu. A mass spectrometric method is given for determination of the isotopic content of the metal. Determination of C by direct combustion-thermal conductivity is described. Methods for the spectrophotometric determination of U with arsenazo I, Th with thorin, Fe with 1,10-phenanthroline or α,α'-dipyridyl, and Cl-, F-, N, and S following separation by distillation are described. If the Pu metal does not contain significant amounts of other radioactive fission products or high specific-activity γ emitters, 241Am may be determined by γ counting. Determination of γ-emitting fission products, U and Th, is determined by γ spectroscopy. Spectrochemical methods for the determination of rare earths, W, Nb, Ta, and about 40 other trace elements are included

  18. Solid phase extraction of uranium(VI) on phosphorus-containing polymer grafted 4-aminoantipyrine

    International Nuclear Information System (INIS)

    Phosphorus-containing polymer grafted 4-aminoantipyrine has been synthesized and used for solid phase extraction of U(VI) prior to its UV-Visible spectrophotometric determination by using arsenazo(III). The adsorbent was characterized by using FT-IR and SEM analysis. The influence of parameters including pH, adsorbent dose, amount of complexing reagent, sample volume and matrix effect have been optimized. The detection limit was determined as 1.4 μg L-1 with preconcentration factor of 30 and RSD of 1.4 %. The accuracy was checked by the analysis of GBW07424 soil and TMDA-64.2 environmental water certified reference materials. The method was applied to natural water and soil samples. (author)

  19. Extracted species of rare earth elements using bis(1,1,3,3-tetramethylbutyl)phosphinic acid as an extractant and their effective mutual separation by high-performance extraction chromatography

    International Nuclear Information System (INIS)

    The possible extracted species of rare earth elements (REE) in bis(1,1,3,3-tetramethylbutyl) phosphinic acid (Hmbp)/cyclohexane-HNO3 system was proposed by a log-log plot analysis and a saturated extraction method as being [M(mbp)3(Hmbp)3] (M = REE). It was also verified by IR, 1HNMR spectra and element analysis of lutetium-Hmbp extracted species. The effective mutual separation of REEs was achieved on the Hmbp modified C-18 column by a pH gradient elution. Moreover, the degree of the mutual separation of europium(III) from gadolinium(III) was remarkably improved by adding glycolic acid in the mobile phase. A fine concentrate of Sm2O3, EU2O3, and Gd2O3 from a rare earths smeltery was analyzed by the present method with the spectrophotometric detection after postcolumn derivatization with Arsenazo III. (author)

  20. Rare earth element determination by HPLC method with postcolumn derivatization

    International Nuclear Information System (INIS)

    Standard rare earth element solutions were prepared from the oxides of the elements. HPLC was used for the element separation and determination. Three complex-forming agents were used for derivation. The best results were achieved when arsenazo III was used. With Chromazurol S at pH = 9.5, the results were significantly dependent on the agent age while chlorophosphonazo III showed significantly lower sensitivity. The optimum values were determined of pH, agent concentration, capillary length and flow rate. The suitability of the method developed was tested on standard materials. Accuracy of determination for the individual elements ranged within 1.6% (Nd) and 7.4% (Eu). The duration of analysis was 25 minutes for a sample containing all lanthanoids. (M.D.). 1 fig., 1 tab., 28 refs

  1. Improved fluorimetric measurement of uranium uptake and distribution in spring wheat (Triticum aestivum L.)

    Energy Technology Data Exchange (ETDEWEB)

    Borcia, Catalin [' ' Alexandru Ioan Cuza' ' Univ., Iasi (Romania). Dept. of Physics; Popa, Karin; Cecal, Alexandru [' ' Alexandru Ioan Cuza' ' Univ., Iasi (Romania). Dept. of Chemistry; Murariu, Manuela [' ' Petru Poni' ' Institute of Macromolecular Chemistry, Iasi (Romania)

    2016-08-01

    Uranium uptake and (radio)toxicity was tested on spring wheat (Triticum aestivum L.) in a laboratory study using differently concentrated uranium nitrate solutions. Within these experiments, two analytical assays of uranium were comparatively tested: a fast and improved fluorimetric assay and the classical colorimetric (U(IV)-arsenazo(III) complexation) one. During the germination, the wheat seeds and plantlets supported well the uranium solutions of treatment within the entire concentration range (1 x 10{sup -4} -5 x 10{sup -3} M). Uranium proved to be non (radio)toxic to wheat as compared with other natural and anthropogenic radiocations, probably because its uptake by spring wheat during the germination is low. Indeed, only a small fraction of uranium administered was located within the roots, whereas the uranium content of the stems was negligible. A high correlation between the results obtained by two analytical methods was found. However, the fluorimetric assay proved to be more reliable and fast, and accurate.

  2. A rapid method for the separation and estimation of uranium in geological materials using ion chromatography

    International Nuclear Information System (INIS)

    Ion Chromatography is an elegant analytical technique which was primarily developed for the analysis of anionic species and over the years has been used successfully to analyse various elements in different matrices. In this work the potential of Ion Chromatography has been used for the rapid separation and estimation of uranium in hydrogeochemical and other geological materials. In this method, cation exchanger-Nucleosil 5 SA, containing resin-spherical silica gel impregnated with sulphonic acid groups is used as stationary phase and elution is performed by using a mixed solution of (10 mM 2-hydroxy isobutyric acid, 5 mM sulphuric acid and 1.9 mM acetonitrile, adjusted pH ∼3.0 using dilute triethanolamine) as mobile phase to separate uranium from the matrix and coupled with a post column spectrophotometric detection with Arsenazo-III at 655 nm. (author)

  3. Galvanic cell without liquid junction for potentiometric determination of copper.

    Science.gov (United States)

    Migdalski, Jan; Błaz, Teresa; Zrałka, Barbara; Lewenstam, Andrzej

    2007-07-01

    This paper describes potentiometric measurements in an integrated galvanic cell with both indicator and reference electrodes. Both electrodes are conducting polymer-based. The copper-sensitive indicator electrode is made by using poly(3,4-ethylenedioxythiophene) (PEDOT) doped with 2-(o-arsenophenylazo)-1,8-dihydroxynaphthalene-3,6-disulphonic sodium salt (Arsenazo-I) as the electroactive substance in the film, while the reference electrode is based on PEDOT doped by 2-morpholineoethanesulfonic acid (MES). It is shown that the galvanic cell can be used for determination of copper both in non-aqueous media (where all PVC-based membranes failed) and in the presence of chloride ions, which disturb the signal of conventional copper ion-selective electrodes with solid-state membranes. It is further shown that the titration of copper ions can be successfully monitored using the described electrochemical cell.

  4. Standard test methods for chemical, mass spectrometric, spectrochemical, nuclear, and radiochemical analysis of nuclear-grade plutonium nitrate solutions

    CERN Document Server

    American Society for Testing and Materials. Philadelphia

    2010-01-01

    1.1 These test methods cover procedures for the chemical, mass spectrometric, spectrochemical, nuclear, and radiochemical analysis of nuclear-grade plutonium nitrate solutions to determine compliance with specifications. 1.2 The analytical procedures appear in the following order: Sections Plutonium by Controlled-Potential Coulometry Plutonium by Amperometric Titration with Iron(II) Plutonium by Diode Array Spectrophotometry Free Acid by Titration in an Oxalate Solution 8 to 15 Free Acid by Iodate Precipitation-Potentiometric Titration Test Method 16 to 22 Uranium by Arsenazo I Spectrophotometric Test Method 23 to 33 Thorium by Thorin Spectrophotometric Test Method 34 to 42 Iron by 1,10-Phenanthroline Spectrophotometric Test Method 43 to 50 Impurities by ICP-AES Chloride by Thiocyanate Spectrophotometric Test Method 51 to 58 Fluoride by Distillation-Spectrophotometric Test Method 59 to 66 Sulfate by Barium Sulfate Turbidimetric Test Method 67 to 74 Isotopic Composition by Mass Spectrom...

  5. [Peripheral nerve stimulation effectiveness in the upper limb function recovery of patients with a stroke sequel: systematic review and meta-analysis].

    Science.gov (United States)

    Obiglio, M; Mendelevich, A; Jeffrey, S; Drault, E; Garcete, A; Kramer, M; Maiaru, M; Modica, M; Ostolaza, M; Peralta, F

    2016-06-16

    Introduccion. Un 30-66% de las personas que sobreviven a un ictus queda con un miembro superior afectado. La estimulacion nerviosa periferica (ENP) influiria positivamente en la actividad muscular de pacientes con deficits motores secundarios a un ictus. Objetivo. Realizar una revision sistematica y un metaanalisis acerca de la efectividad de la aplicacion de la ENP en la recuperacion de la funcion del miembro superior plejico/paretico en sujetos con secuela de ictus. Sujetos y metodos. Se incluyeron ensayos clinicos controlados aleatorizados y no aleatorizados, y estudios cruzados, publicados hasta noviembre de 2014 en Medline, Cochrane Central Register of Controlled Trials, LILACS, SciELO y Open Grey. Se excluyeron articulos con alto riesgo de sesgo. Dos investigadores independientes evaluaron la elegibilidad de los estudios, y realizaron la extraccion y analisis de los datos. Resultados. Se encontraron 1.967 articulos, de los cuales se incluyeron cinco para la extraccion de datos y analisis, con una moda de riesgo de sesgo de 6/10 en la escala PEDro. Se incluyeron en total 224 sujetos, de los cuales 95 recibieron ENP en diversas modalidades y 129 recibieron otras intervenciones como grupo control. Conclusion. Los datos analizados sugieren que la funcion del miembro superior plejico/paretico mejora tras la aplicacion de ENP en conjunto o no con entrenamiento funcional. Sin embargo, el resultado del metaanalisis indica que aun no se dispone de evidencia suficiente para avalar la efectividad del uso de ENP para la recuperacion de la funcion del miembro superior plejico/paretico en sujetos con secuela de ictus.

  6. Evaluación del proceso integral para la obtención de aceite esencial y pectina a partir de la cáscara de naranja Integral evaluation process for obtaining pectin and essential oil

    Directory of Open Access Journals (Sweden)

    Ivonne Cerón-Salazar

    2011-06-01

    Full Text Available En este trabajo se presentó la extraccion de aceite esencial y pectina a partir dela cascara de naranja (Citrus sinensis como un proceso integral. Se realizó elproceso de extracción utilizando un simulador comercial adaptandose al procesoreal. Se realizaron pruebas experimentales con un kilogramo de cáscara de naranja procesado a las mismas condiciones de la simulacion con el fin de comparar los rendimientos obtenidos, logrando una concordancia aceptable. Posteriormente se escaló el proceso a una tonelada. Como resultado no solo se demuestran las ventajas del proceso integral, sino tambien la posibilidadde su implementacion a nivel industrial. Se concluye ademas que las tecnicas de simulacion son una herramienta poderosa que permite minimizar tiempo,costos y experimentacion en el diseñode procesos como los de extraccion de aceite esencial y pectina.In this paper, an alternative for essential oil and pectin extraction from orange peel (Citrus sinensis as an integral process was presented. The extraction units were simulated using commercial simulator software for real process conditions. Experimental tests were carried out with a kilogram of orange peel with the same conditions used in of the simulation with the aim of comparing the experimental and calculated yields. Subsequently, the process was scaled to 1000 kg. Advantages of the integrated process and its possibilities of implementation at industrial level were showed. Moreover, it was concluded that simulation techniques are powerful tools that allows minimizing time, costs and experimentation in the design of processes such as essential oil extraction and pectin extraction.

  7. La plataforma Moodle: Una herramienta útil para la formación en soporte vital. Análisis de las encuestas de satisfacción a los alumnos e instructores de los cursos de soporte vital avanzado del programa ESVAP de la semFYC

    Directory of Open Access Journals (Sweden)

    Juan Antonio Cordero Torres

    2015-06-01

    Discusión: De los resultados se concluye que: 1 para los alumnos resulta muy útil una fase no presencial previa y consideran que ayuda bastante/mucho a aprovechar la fase presencial, y 2 los instructores consideran que la fase no presencial ha ayudado bastante en el aprovechamiento y eficiencia de los talleres en la fase presencial.

  8. Repercusión de los esguinces de tobillo sobre el equilibrio postural

    OpenAIRE

    Laura Martín-Casado

    2015-01-01

    Objetivo. Analizar las diferencias intrasujeto en el equilibrio postural durante la realización de test de equilibrio estáticos y dinámico – funcionales, entre una extremidad que presentó signo de bostezo articular en el tobillo, fruto de una lesión previa de esguince lateral, frente a una extremidad sin bostezo.

  9. Los principios de la bioética

    OpenAIRE

    Serrano Ruiz-Calderón, José Miguel

    1992-01-01

    Abordar el tema de cuáles son los principios que inspiran, o deben inspirar la bioética, obliga a dilucidar algunas cuestiones previas, entre otras si es posible definir una bioética normativa y exigente en una sociedad pluralista. .

  10. Montelukast reduces asthma exacerbations in 2- to 5-year-old children with intermittent asthma

    DEFF Research Database (Denmark)

    Bisgaard, Hans; Zielen, Stefen; Garcia-Garcia, María Luz;

    2005-01-01

    The PREVIA study was designed to investigate the role of montelukast, a leukotriene receptor antagonist, in the prevention of viral-induced asthma exacerbations in children aged 2 to 5 years with a history of intermittent asthma symptoms. The study was a 12-month multicenter, double-blind, parall...

  11. Resonancia magnética de la columna lumbar intervenida por hernia discal

    OpenAIRE

    Naranjo Santana, Pedro Antonio

    1999-01-01

    [ES] La Resonancia Magnética de la Columna Lumbar previa, y tras la administración de Gadolinio, se propone como prueba diagnóstica de primera elección de los pacientes intervenidos por hernia discal que presentan recaída de la sintomatología.

  12. Los refranes en el quijote (Estudio critico de la traducción al esloveno

    Directory of Open Access Journals (Sweden)

    Juan Carlos Oven

    1991-12-01

    Full Text Available Antes de afrontar el tema de los refranes en el Quijote será útil acercarnos a este campo específico de la literatura con algunasconsideraciones previas que nos ayuden a iluminar determinados aspectos de este estudio.

  13. Repercusión de los esguinces de tobillo sobre el equilibrio postural

    Directory of Open Access Journals (Sweden)

    Laura Martín-Casado

    2015-09-01

    Full Text Available Objetivo. Analizar las diferencias intrasujeto en el equilibrio postural durante la realización de test de equilibrio estáticos y dinámico – funcionales, entre una extremidad que presentó signo de bostezo articular en el tobillo, fruto de una lesión previa de esguince lateral, frente a una extremidad sin bostezo.

  14. Esclerómetro rotativo automático

    Directory of Open Access Journals (Sweden)

    Tobío, José M.

    1958-04-01

    Full Text Available Not availableSe describe un aparato sencillo para la determinación de la dureza superficial de los aglomerantes hidráulicos y se da cuenta de algunas experiencias previas con probetas de mortero y pasta pura efe cemento.

  15. Análisis del comportamiento de la demanda hotelera y su posible interferencia por el sistema de clasificación oficial de la oferta

    OpenAIRE

    Esteban Talaya, Águeda; Reinares Lara, Eva Marina

    1996-01-01

    Se ofrece una hipótesis asociada al problema derivado de la existencia de categorías hoteleras basada en la clasificación oficial previa de carácter administrativo y su posible interferencia en las relaciones empresa-mercado.

  16. 彩色多普勒超声对帆状胎盘并血管前置的诊断价值及其临床意义的研究

    Institute of Scientific and Technical Information of China (English)

    李文丽; 刘艳丽

    2013-01-01

    velamentous placenta and vasa previa is a rare obstetric complications of pregnancy, fetal presentation of vasa previa is oppressive or rupture, harm to the fetus, fetal distress and neonatal asphyxia, in a short period of time can make a perinatal death, extremely easy to cause medical disputes. Early diagnosis and prompt treatment can make the perinatal obtain better prognosis. On the diagnosis of velamentous placenta previa and vessels of the most important and effective method of color Doppler echocardiography. On the basis of the 2003 to 2011 11 cases of velamentous placenta and vasa previa clinical case discussion, Doppler ultrasound examination of velamentous placenta previa and vascular diagnostic value and clinical significance of.%  帆状胎盘并血管前置是一种产科少见的妊娠合并症,前置血管被胎先露压迫或破裂出血时,对胎儿危害极大,发生胎儿宫内窘迫及新生儿窒息,可在短时间内使围产儿死亡,极易引起医疗纠纷。早期诊断和及时处理可使围产儿获得较好的预后。对诊断帆状胎盘并血管前置最重要及有效的方法是彩色多普勒超声。本研究结合2003年至2011年11例帆状胎盘并血管前置临床病例,探讨多普勒超声检查对帆状胎盘并血管前置的诊断价值及临床意义。

  17. Effect of maternal age on maternal and neonatal outcomes after assisted reproductive technology

    DEFF Research Database (Denmark)

    Wennberg, Anna Lena; Opdahl, Signe; Bergh, Christina;

    2016-01-01

    weeks), low birth weight (LBW; mortality (≥28 weeks). Adjusted odds ratios (AORs) were calculated. Associations between maternal age and outcomes were analyzed. RESULT(S): The risk of placenta previa (AOR 4.11-6.05), cesarean delivery (AOR 1......OBJECTIVE: To compare the effect of maternal age on assisted reproductive technology (ART) and spontaneous conception (SC) pregnancies regarding maternal and neonatal complications. DESIGN: Nordic retrospective population-based cohort study. Data from national ART registries were cross.......18-1.50), PTB (AOR 1.23-2.19), and LBW (AOR 1.44-2.35) was significantly higher in ART than in SC pregnancies for most maternal ages. In both ART and SC pregnancies, the risk of HDP, placenta previa, cesarean delivery, PTB, LBW, and SGA changed significantly with age. The AORs for adverse neonatal outcomes...

  18. Study of foetomaternal outcome of antepartum haemorrhage in pregnancy

    Directory of Open Access Journals (Sweden)

    Siddhartha Majumder

    2015-12-01

    Conclusions: Educating pregnant mothers about the importance of antenatal care and easy accessibility to quality antenatal services would go a long way in bringing down the maternal and perinatal morbidity and mortality related with antepartum haemorrhage. The morbidity associated with placenta previa can be reduced by detecting the condition in the antenatal period by ultrasound, before it becomes symptomatic. Intensive family planning program and awareness of small family norm helps in decreasing cases of APH in relation with age and parity. Efforts should be made to reduce the rates of operative deliveries, because there is a greater likelihood of placenta previa in a scarred uterus. There is a lot of scope on further research in the field of APH for further reduction in foetal and maternal morbidity and mortality. [Int J Reprod Contracept Obstet Gynecol 2015; 4(6.000: 1936-1939

  19. Valoración Médica de Psitácidas y Primates Neotropicales

    Directory of Open Access Journals (Sweden)

    Nestor Varela

    2008-06-01

    Full Text Available La evaluación clínica comienza desde el proceso de recepción, ya que permite hacer una apreciación sobre la urgencia del problema, si es que la hay. Aunque no es común en la práctica con especies silvestres, la comunicación telefónica previa al arribo del animal al consultorio, es útil para recolectar información y para dar recomendaciones sobre el transporte del espécimen. En muchos casos la recolección previa de datos importantes no sólo es útil para realizar un examen adecuado, sino también para hacer un manejo apropiado del espécimen en Centros de rescate y rehabilitación.

  20. BIOFERTILIZATION USING RHIZOBACTERIA AND AMF IN THE PRODUCTION OF TOMATO (Lycopersicon esculentum Mill. AND ONION (Allium cepa L. SEEDLINGS. II. ROOT COLONIZATION AND NUTRITIONAL STATUS

    Directory of Open Access Journals (Sweden)

    L. E. Pulido

    2003-01-01

    Full Text Available Como complemento a estudios precedentes de la biofertilización en posturas de plantas hortícolas sobre suelos Ferralíticos Rojos compactados, eútricos y en áreas experimentales de la Universidad de Ciego de Ávila, se evaluaron los efectos de la inoculación simple y la coinoculación, mediante el recubrimiento de semillas y sin aplicar fertilizantes minerales, con rizobacterias promotoras del crecimiento vegetal -RPCV- (Azospirillum brasilense, Azotobacter chroococcum y Burkholderia cepacia y hongos micorrízicos arbusculares - HMA- (Glomus clarum y G. fasciculatum en algunos indicadores de la colonización radical por los microorganismos y el estado nutricional de plántulas de tomate y cebolla. A partir de los resultados, se evidenció que, para ambos cultivos, las poblaciones de A. chroococcum, B. cepacia y A. brasilense se incrementaron significativamente en aquellos tratamientos inoculados con estas rizobacterias, encontrando, en general, los mayores valores en los tratamientos que fueron coinoculados. Respecto a la micorrización, los mayores porcentajes de colonización micorrízica y masa del endófito en tomate se obtuvieron mediante la coinoculación de A. brasilense con ambas especies de HMA y, para la cebolla, la máxima colonización la realizó G. fasciculatum aplicada de forma independiente, mientras que la masa del endófito fue mayor en la coinoculación de G. clarum + A. chroococcum. En relación con el estado nutricional de las plantas, en tomate, los tratamientos con presencia conjunta de A. brasilense y ambas especies de HMA fueron los que hicieron mayores extracciones de N y estuvieron entre los que realizaron mayores extracciones de P y K. En cebolla, todos los tratamientos inoculados con ambos tipos de microorganismos fueron capaces de extraer mayores cantidades de N, P y K. Todos estos resultados permiten explicar las causas de la obtención de posturas de adecuada calidad mediante la biofertilización sin el uso

  1. Rendimientos de sustancias húmicas de ocho lombricompuestos

    Directory of Open Access Journals (Sweden)

    Torrente Trujillo Armando

    1995-12-01

    Full Text Available

    They were probed NaOH1KOH, Na4P2O7, NaOH + Na4P2O7, and urea in different concentration for extract humic and fulvic acids from lombricompost. It was found that NaOH 0.1 M is the desirable extractant because is efficient, low in salt and economic. It was made extractions of AH and FA from a eight lombricomposts (cow dung, filter-press cake, coffe pulp and grass residues, with and without lime with NaOH 0.1 M to evaluate the yield (organic C and the quantities obtained by a process ajusted in the present research. The results indicated that the lombricompost from cow dung, filter-press cake and grass residues had similar yields of organic C. C as AH, but superior to the coffee pulp lombricompost. The AH had high concentration of organic C. C compared with FA. The humification ratio in the lombricomposts was higher than soils, turbes, lignites, coals, etc. The lime increase the yield of organic C in both lombricomposts and AH.

    Se probaron extracciones de ácidos húmicos (AH y fulvo ácidos (FA de lombricompuestos con soluciones de NaOH, KOH, Na4P202 NaOHNa4P2O7 y úrea a diversas concentraciones, concluyendo que el NaOH 0.1 M es la más recomendable por su eficiencia, baja concentración de sales, economía y facilidad de tratamiento. Se realizaron extracciones de AH y FA de ocho lombricompuestos (bovinaza, cachaza, pulpa de café y residuos de prado, con encalamientos y sin él, aplicando NaOH 0.1 M y evaluando los rendimientos (C org y las cantidades obtenidas por un proceso metodológico ajustado en la presente investigación. Los lombricompuestos de bovinaza, cachaza y pasto poseen similares rendimientos de C org en la forma de AH, siendo mayores los de la pulpa de café. Los AH poseen mayor concentración en C org en comparación a los FA, cuyos niveles son muy bajos. La relación de humificación de los Iornbricompuestos, es mayor que las encontradas en suelos, turbas, lignitos

  2. CALIDAD MICROBIOLÓGICA DE PROPÓLEO CRUDO Y SÓLIDOS SOLUBLES DE EXTRACTOS DE PROPÓLEOS DE Apis mellifera EN COLOMBIA

    Directory of Open Access Journals (Sweden)

    C. Talero

    2012-01-01

    Full Text Available Se tomaron cincuenta y nueve muestras de propóleo crudo recolectadas en tres orígenes geográficos de Colombia, a las cuales se les realizó control de la calidad microbiológica, y se determinó el porcentaje de extracto seco obtenido de las extracciones etanólicas de propóleo ( ee P al 70 y 96%. s e cuantificaron los grupos indicadores mesófilos aerobios, coliformes totales, coliformes fecales, Staphylococcus sp., mohos y levaduras, y se encontraron conteos en promedio de 93x10 3 ; 79x10 2 ; <1; 94; 10x10 4 UFC/g, res - pectivamente. La detección de patógenos se realizó para Escherichia coli y Staphylococcus aureus , los cuales estuvieron presentes en el 4 y 2% de las muestras, respectivamente. Los hallazgos microbiológicos se compararon con normas de calidad de Japón, Perú y e l s alvador; se encontró que el grupo indicador mohos y levaduras fue el más crítico, donde 92 a 94% de las muestras evaluadas estuvieron por fuera de los límites exigidos por estas normas. Los resultados indican que las extracciones con etanol al 70 y 96% de propóleos colombianos, en promedio obtuvieron 93,0 y 175,3 mg/ml de extracto seco, respectivamente. La concentración de extracto seco se comparó con la normatividad existente en Brasil, a rgentina y Japón. Para la norma más exigente, que corresponde a la brasileña, se hallaron porcentajes de cumplimiento del 53,4 y 56,1% para ee P 70 y 96%, respectivamente, y para la norma de Japón se encontraron aceptables 75,9 y 69,7% de los ee P 70 y 96%, respectivamente. Los resultados están asociados al origen fitogeo - gráfico y a la producción no especializada de propóleos. e n este estudio se incluyeron muestras de propóleo crudo de países como Bélgica, Chile, Cuba y Nueva Zelanda.

  3. OPTIMIZACIÓN DE UNA METODOLOGÍA PARA LA EXTRACCIÓN DE LA HUMINA DE UN OXISOL DE COLOMBIA. FRACCIONAMIENTO Y CARACTERIZACIÓN FISICOQUÍMICA

    Directory of Open Access Journals (Sweden)

    María Ballesteros

    2009-01-01

    Full Text Available La Amazonia colombiana es una reserva natural que debe conservarse inalterada y la materia orgánica es un componente importante del suelo ya que es  fuente de nutrientes para la planta.La humina del suelo ha sido poco tenida en cuenta  en la sostenibilidad de este ecosistema, aunque es considerada que desempeña un papel fundamental en la dinámica del suelo, por lo tanto requiere ser estudiada. Como objetivos se plantearon, evaluar las condiciones experimentales para la extracción y  el fraccionamiento de la humina de los horizontes A y BA de un Oxisol del Amazonas, en cuanto a la relación suelo- extractante, número de extracciones y la caracterización de las fracciones obtenidas mediante análisis elemental de C, H y N;  relación E4/E6 y análisis térmico diferencial (ATD. Se encontraron como condiciones óptimas de extracción: una relación suelo / extractante 1:40 en la fracción del suelo menor de 50 mm, un tiempo de agitación de una hora, con 4 extracciones sucesivas para el suelo del horizonte A y una sola para el BA debido al menor contenido de materia orgánica. Se encontraron porcentajes de nitrógeno y un grado de aromaticidad más bajos que los de los ácidos húmicos. Sin embargo, al comparar las diferentes fracciones de humina, la humina de insolubilización extraíble y la unida a hierro mostraron mayor grado de aromaticidad y de condensación que la de insolubilización no extraíble.  En cuanto al análisis térmico diferencial (ATD no se presentaron diferencias apreciables, todas las fracciones fueron más estables que los ácidos húmicos, con una zona relativamente plana entre 490 º C y 600 º C.  

  4. Automatización y miniaturización de sistemas de screening y determinación de residuos de plaguicidas en muestra agroalimentaria

    OpenAIRE

    Columé Díaz, Almudena

    2001-01-01

    El objeto de esta Tesis se centra en la automatización de las operaciones previas del proceso analítico para conseguir la simplificación y automatización del mismo así como su aplicación directa a muestras con matrices complejas (frutas y hortalizas). Además, se evalúa la posible contaminación por las especies determinadas (plaguicidas)

  5. Introduction of Routine Obstetric Ultrasound in an Urban Health Center: Results and Benefits

    Directory of Open Access Journals (Sweden)

    Ruby Angeline Pricilla

    2014-12-01

    Conclusion: Maternal morbidity and mortality can be reduced by early detection of missed abortion, placenta previa, twin pregnancy, and molar pregnancy by routine obstetric ultrasound at booking visit. Routine obstetric ultrasound at the first and second trimesters had obvious benefits in confirming the expected date of delivery in a community where remembering the last menstrual period was not a priority. Introduction of this procedure helped in appropriate management of post-term pregnancies.

  6. A comparative study of ultrasonography versus magnetic resonance imaging in the diagnosis of abnormally adherent low lying placenta

    Directory of Open Access Journals (Sweden)

    Mohd. Ashraf

    2016-05-01

    Conclusions: Prenatal diagnosis is a key factor in optimizing the counseling, treatment and outcome of patients with placental adhesive disorder. Any women with placenta previa and previous uterine surgery should undergo careful imaging to assess the presence of placental adhesive disorder. Magnetic resonance imaging appears better diagnostic aid as compared to ultrasonography in diagnosing placental adhesive disorder. [Int J Reprod Contracept Obstet Gynecol 2016; 5(5.000: 1428-1432

  7. Predicción del riesgo individual de alto coste sanitario para la identificación de pacientes crónicos complejos

    Directory of Open Access Journals (Sweden)

    Jordi Coderch

    2014-07-01

    Conclusiones: El consumo sanitario elevado se relaciona con la morbilidad crónica compleja. Un modelo basado en la edad, la morbilidad y la utilización previa es válido para predecir el riesgo de alto consumo, y así identificar la población diana de estrategias de atención proactiva para pacientes crónicos complejos.

  8. Pensar lo impensable; una aproximación a la psicosis.

    Directory of Open Access Journals (Sweden)

    Alfred Capellá Batista-Alentom

    2004-01-01

    Full Text Available Se aborda el trastorno psicótico en varios pasos. Primero, se delimitan las dificultades previas. Segundo, se esboza un modelo sobre la mente. Tercero, se aborda la patología mental y, a continuación, se diseña un modelo de comprensión del funcionar psicótico. Se extraen, finalmente, conclusiones.

  9. Is pentoxifylline effective in alcoholic hepatitis? –First update.

    Science.gov (United States)

    Rada, Gabriel; Arteaga, Matías; Candia, Roberto

    2016-06-14

    ACERCA DE LA ACTUALIZACIÓN: Este resumen Epistemonikos (Living FRISBEE: Living FRIendly Summary of the Body of Evidence using Epistemonikos) es una actualización del resumen publicado en Junio de 2014. Incorpora una nueva revisión sistemática que identificó un estudio no incluido en las revisiones previas. La incorporación de esta nueva evidencia lleva a cambios sustantivos en la evidencia existente.

  10. Real increasing incidence of hysterectomy for placenta accreta following previous caesarean section.

    LENUS (Irish Health Repository)

    Higgins, Mary F

    2013-11-01

    Placenta accreta, morbid adherence to the uterus to the myometrium, is commonest in association with placenta previa in women previously delivered by caesarean section (CS). It has become proportionally a greater cause of major maternal morbidity and mortality as the frequency of other serious obstetric complications has declined. The aim of this study was to examine the incidence of placenta accreta in the context of a rising caesarean delivery rate.

  11. El discurso en la mirada: los Españoles y la visión del Tawantinsuyo

    Directory of Open Access Journals (Sweden)

    Martha Barriga Tello

    2011-05-01

    Full Text Available El estudio ofrece las diversas lecturas de los monumentos del Imperio Inca realizadas por los primeros españoles. Sus apreciaciones varían de acuerdo a su experiencia previa, sus conocimientos y aquello con que les era posible compararlos. La primera impresión quedará como eje para las opiniones que posteriormente ofrecerán en sus escritos.

  12. Alumnos con necesidades educativas especiales

    OpenAIRE

    Álvarez Pérez, Luis

    1995-01-01

    El objetivo de este trabajo es delimitar el concepto de alumno con necesidades educativas especiales y determinar como se tiene que abordar su educación en el marco del proyecto educativo de centro. Además se pretende establecer un modelo operativo para consignar las adaptaciones curriculares que sea preciso adoptar en función de las orientaciones establecidas en la evaluación previa

  13. El presidencialismo en el mundo: diferencias entre Estados Unidos de Norteamérica, Iberoamérica y Europa*

    Directory of Open Access Journals (Sweden)

    Pedro Fernández Barbadillo

    2012-12-01

    Full Text Available I. Consideraciones previas sobre los sistemas políticos: una reflexión genéricaII. La figura del presidente en América del Norte y América del SurIII. La no reelección como característica constitucionalIV. Los regímenes semipresidenciales: Francia y RusiaV. Peculiaridades de la inelegibilidad: expresidentes y familiaresVI. Conclusiones

  14. Inhibitory voluntary control of memory: effect of stimulus onset asynchrony on reaction time to suppressed memories

    OpenAIRE

    Martínez, José L.; Luciano, Juan V; Salvador Algarabel

    2006-01-01

    Anderson & Green (2001) utilizando una adaptación de la tarea go-no go, han demostrado recientemente que los sujetos pueden inhibir voluntariamente la recuperación de determinados recuerdos. Presentamos tres experimentos, en los cuales tratamos de determinar el grado de automaticidad y el rol de la relación previa entre prime y target, en el desarrollo de este proceso inhibitorio. En los primeros dos experimentos, se manipula la asincronía estimular de l...

  15. Transporte forestal con cables

    OpenAIRE

    Anaya L. Héctor J.

    2012-01-01

    La explotación forestal es un problema fundamentalmente de transporte. El apeo y la preparación de las trozas, aunque a veces presentan algunas dificultades, son operaciones fáciles de resolver comparadas con la operación de transporte la cual absorbe del 60% al 70% o más del costo total del aprovechamiento del bosque. El 30% o 40% restante es absorbido por las faenas previas de apeo y troceo.

  16. Evaluación positiva de medicamentos: 2º Trimestre 2013

    Directory of Open Access Journals (Sweden)

    A. García Luque

    2013-09-01

    Full Text Available Se reseñan los medicamentos ya evaluados por la Agencia Española de Medicamentos y Productos Sanitarios hechos públicos en el segundo trimestre de 2013, y considerados de mayor interés para el profesional sanitario. Se trata de opiniones técnicas positivas que son previas a la autorización y puesta en el mercado del medicamento.

  17. Contribución al estudio de los reacciones de hidratación del cemento portland por espectroscopia infrarroja II. Estudio de clínkeres y de cementos portland anhidros

    Directory of Open Access Journals (Sweden)

    Vázquez-Moreno, Tomás

    1976-06-01

    Full Text Available Not availableEn un artículo anterior (1 se dio cuenta de los trabajos realizados sobre la aplicación de la espectroscopia IR al estudio de las principales fases sintetizadas del clínker de cemento portland como fase previa al estudio de diversos clínkeres, obtenidos por nosotros en el laboratorio a partir de crudos industriales, y de distintos cementos portland comerciales anhidros.

  18. El comportamiento residencial de los mayores: análisis biográfico de la movilidad en la vejez

    OpenAIRE

    Puga González, María Dolores

    2001-01-01

    En las actuales sociedades europeas envejecidas, los comportamientos residenciales de las personas de edad están adquiriendo una importancia creciente. En este artículo se exploran las relaciones causales entre la biografía migratoria previa y las pautas residenciales adoptadas tras los 55 años, usando Event History Analysis. Los resultados demuestran que el lugar de nacimiento marca la trayectoria migratoria posterior de los individuos, llegando a afectar incluso al comportamient...

  19. Evaluación positiva de medicamentos: junio y julio 2014

    Directory of Open Access Journals (Sweden)

    P. Sánchez López

    2014-12-01

    Full Text Available Se reseñan los medicamentos ya evaluados por la Agencia Española de Medicamentos y Productos Sanitarios hechos públicos en junio, julio y agosto de 2014, y considerados de mayor interés para el profesional sanitario. Se trata de opiniones técnicas positivas que son previas a la autorización y comercialización del medicamento.

  20. The Process of Permanence on the Streets. Street Children in Mexico City

    Directory of Open Access Journals (Sweden)

    Patricia Murrieta

    2010-01-01

    escoger, hace un balance entre su experiencia previa y la vida en calle. Pero no todos los niños tienen opciones o la posibilidad de ejercer su elección. Mi objetivo principal es tratar de comprender las razones por las cuales un niño se queda a vivir en la calle aún cuando tiene que enfrentar situaciones tan problemáticas como aquellas situaciones enfrentadas en su casa o en los albergues.

  1. Bioética, Religión y Salud. [Reseña

    OpenAIRE

    Talledo, J.B. (Jaime B.)

    2009-01-01

    Reseña de: Isidoro MARTÍN SÁNCHEZ (coord.). Bioética, Religión y Salud; Miguel Ángel SÁNCHEZ GONZÁLEZ, Informe sobre Instrucciones Previas, Consejeria de Sanidad y Consumo de la Comunidad de Madrid, Dirección General de Aseguramiento y Atención al Paciente, Subdirección General de Bioética y Orientación Sanitaria, Madrid, 2008. 352 pp.

  2. Evaluación positiva de medicamentos: marzo/abril/mayo 2015

    Directory of Open Access Journals (Sweden)

    R. Aparicio Hernández

    2015-09-01

    Full Text Available Se reseñan los medicamentos evaluados y con dictamen positivo por comisión de expertos de la Agencia Española de Medicamentos y Productos Sanitarios o de la Agencia Europea del Medicamento hechos públicos en marzo, abril y mayo de 2015. Se trata de opiniones técnicas positivas previas a la autorización y puesta en el mercado del medicamento.

  3. Ensayos sobre gestión financiera del capital circulante = Essays on working capital management.

    OpenAIRE

    Baños Caballero, Sonia

    2013-01-01

    Palabras clave: Gestión del capital circulante Necesidades operativas de fondos Valor de la empresa Restricciones financieras Resumen en castellano: Esta Tesis tiene como objetivo analizar la gestión de los activos y pasivos corrientes de la empresa de forma conjunta. La importancia de estas partidas se refleja en los numerosos estudios realizados sobre clientes, proveedores, inventarios y tesorería. No obstante, la literatura previa sugiere que estos componentes del capita...

  4. El consentimiento libre, previo e informado como garantía de transparencia en la administración pública

    OpenAIRE

    Juan Pablo Charris Benedetti

    2014-01-01

    La consulta previa es un derecho fundamental del que son titulares los grupos étnicos para decidir sobre todo tipo de medida estatal que pueda afectarlos directamente. Encuentra su fundamento constitucional en el reconocimiento de la identidad multicultural del Estado colombiano, bajo una óptica democrática incluyente; en el derecho que tienen los pueblos a decidir sus propias prioridades de acuerdo con sus propias creencias, instituciones y/o territorios que ocupan o utilizan; y en el derech...

  5. Uso profiláctico de antibióticos previos a la cesárea

    Directory of Open Access Journals (Sweden)

    María Montserrat Méndez-Brich

    2011-12-01

    Full Text Available La cesárea es el procedimiento quirúrgico que se realiza con mayor frecuencia en la práctica obstétrica, siendo su principal complicación la endometritis puerperal. El presente estudio pretende determinar la efectividad de la profilaxis antibiótica previa a una cesárea para prevenir las infecciones puerperales. Se revisó la literatura publicada entre el año 1994 y el año 2009 relacionada con el tema de profilaxis antibiótica previa a la cesárea utilizando las bases de datos (MD Consult y EBSCO, clasificando las publicaciones entre aquellas que apoyan la profilaxis y las que no lo recomienda. También se determinó el antibiótico de mayor eficacia. En el 99% de las investigaciones consultadas, la utilización de antibióticos profilácticos fue efectiva. Además, el 71.4% de los estudios concluye que la profilaxis antibiótica es más efectiva si se aplica previa a la incisión quirúrgica de la cesárea, mientras que en el 28.6% se concluyó que no existe correlación con el momento de la aplicación. Basándose en estos datos, se concluye que la profilaxis antibiótica previa a la cesárea es efectiva. El momento ideal de la aplicación de la profilaxis es previo a la incisión quirúrgica de la cesárea y no tiene efectos adversos en el resultado neonatal.

  6. Describir la realidad: El postimpresionismo como excusa

    Directory of Open Access Journals (Sweden)

    Enrique Peláez Malagón

    2007-01-01

    Full Text Available Un problema que aparece en algunas personas que estudian E/LE es el poco conocimiento de la cultura estética ya que ésta (en principio no es su especialidad. Este problema se agrava cuando en una clase de Cultura y Civilización Españolas se han de explicar los movimientos artísticos hispanos y se carece, por parte del alumnado, de una base previa.

  7. Leucemia mieloblástica aguda tras un trasplante de progenitores hematopoyéticos en pacientes con leucemia aguda mieloblástica: características citogenéticas y moleculares

    OpenAIRE

    Grau Cat, Javier

    2016-01-01

    Las LAM que acontecen tras un TPH efectuado a pacientes con LAM siempre han sido consideradas recaídas de la LAM inicial. Sin embargo, estos pacientes han recibido tratamientos con regímenes que incluyen antraciclinas y citarabina y, posteriormente, se han consolidado con un TPH, previo acondicionamiento con agentes alquilantes, antimetabolitos e ICT. Dado que la quimioterapia previa recibida, principalmente la dosis total acumulada de agentes alquilantes, se considera el factor de riesgo más...

  8. Impacto de las medidas agroambientales en la viabilidad economica del cultivo ecologico e integrado de clementinas de la Comunidad Calenciana

    OpenAIRE

    Peris Moll, Elena M.; Julia Igual, Juan Fco.

    2006-01-01

    El presente articulo indaga en las causas del escaso grado de expansion del cultivo ecologico e integrado de clementinas en la COmunidad Valenciana. Con este fin se realiza un analisis de costes centrado en la fase de produccion en campo, previa revision del estado actual de expansion de los citados cultivos en la region, asi como de la evolucion de las correspondientes primas agroambientales. Por ultimo, se analiza en que medida las subvenciones agroambientales pueden constituir un incentivo...

  9. Perineal scanning.

    Science.gov (United States)

    Jeanty, P; d'Alton, M; Romero, R; Hobbins, J C

    1986-10-01

    Although various techniques have been described to aid in the ultrasound diagnosis of placenta previa and incompetent cervix, these maneuvers depend on the precise identification of the internal cervical os, a feat which is notoriously difficult to accomplish consistently. In an attempt to get a closer view of the cervix we tried another approach. This simple technique of perineal scanning has the potential to help considerably with these problems. PMID:3530265

  10. Crear conocimiento colectivamente: aprendizaje organizacional y grupal

    OpenAIRE

    CARLOS MARÍA ALCOVER; FRANCISCO GIL

    2002-01-01

    El objetivo de este trabajo es analizar el aprendizaje colectivo, en qué consiste, en qué niveles se produce, qué condiciones requiere y qué resultados aporta. Se analiza en primer lugar el aprendizaje organizacional, abordando cuestiones conceptuales previas (como la distinción entre aprendizaje organizacional y organizaciones que aprenden); a continuación se revisan las contribuciones de distintas disciplinas, los niveles de aprendizaje, sus tipos o ciclos y los modelos explicativos, su ...

  11. ¿Nuevos modelos, viejos esquemas? El chino y la didáctica de lenguas extranjeras en el marco de convergencia europea

    OpenAIRE

    Casas-Tost, Helena; Rovira-Esteva, Sara

    2009-01-01

    El objetivo de esta presentación es analizar cómo se han llevado a cabo las diferentes aplicaciones del Marco común europeo de referencia para las lenguas al chino en el contexto español. Se hace un repaso de las experiencias previas de aplicación de marcos o modelos supuestamente universales al chino, se presentan los problemas detectados y una serie de propuestas de mejora.

  12. Evaluación positiva de medicamentos: 1.er trimestre 2013

    Directory of Open Access Journals (Sweden)

    P. Sánchez López

    2013-06-01

    Full Text Available Se reseñan los medicamentos ya evaluados por la Agencia Española de Medicamentos y Productos Sanitarios hechos públicos en el primer trimestre de 2013, y considerados de mayor interés para el profesional sanitario en el ámbito hospitalario. Se trata de opiniones técnicas positivas que son previas a la autorización y puesta en el mercado del medicamento.

  13. Evaluation of Patients with Postpartum Hemorrhage Patients in a University-Affiliated Tertiary Care Hospital

    Directory of Open Access Journals (Sweden)

    Burcu Kasap

    2016-03-01

    Full Text Available Aim: To retrospectively evaluate patients with postpartum hemorrhage (PPH and to report the incidence, indication, and complications of PPH-related hysterectomies. Methods: We evaluated medical records of patients who received the diagnosis of in a university-affiliated tertiary care hospital between February 2013 and September 2014. Results: A total of 1724 deliveries were included in the study. 36 deliveries (2.08% were complicated with PPH. PPH was found to result from the following conditions; uterine atony (n=19, placenta previa (n=8, vaginal lacerations (n=7, and coagulation disorders (n=2. A total of 7 patients (19.4% with PPH, of whom two had uterine atony and five had placenta previa, underwent hysterectomy (4.06 per 1000 births. Application of B-Lynch uterine compression suturing and hypogastric artery ligation did not stop PPH in two patients with atony after primary caesarean section. Balloon tamponade was successful in 71.4% of patients with placenta previa. The most common complication among hysterectomy patients was admission to intensive care unit. Conclusion: Despite the improvements in conservative management strategies, our hysterectomy rate was higher than the reported literature. We conclude that management options should be individualized according to diagnosis, hemodynamic stability of patients and also facilities of the medical centre.

  14. Aproximación de la recarga de agua subterránea en el norte del Departamento del Cauca, Colombia

    Directory of Open Access Journals (Sweden)

    Cristo Facundo Pérez

    2016-01-01

    Full Text Available Las aguas subterráneas representan una importante alternativa para el desarrollo de actividades socioeconómicas en regiones donde la oferta de agua superficial no satisface las necesidades o su calidad es deficiente. Sin embargo, su aprovechamiento debe estar en función del conocimiento de su oferta. El norte de Departamento del Cauca es una zona con un importante desarrollo agrícola e industrial, donde se viene presentando extracciones de aguas subterráneas sin conocimiento del volumen ofertado. El objetivo del presente estudio fue estimar la recarga del acuífero como herramienta para su gestión en las actividades desarrolladas en la región. En este sentido, la recarga anual del acuí - fero fue estimada mediante balance hídrico, partiendo de la definición de un volumen de control delimitado con la hidrogeología del acuífero, e identificando los componentes de recarga (precipitación, agua de riego, y caudal superficial de entrada y descarga (Evapotranspiración real, caudal de extracción por bombeo, y caudal superficial de salida. El volumen de recarga anual calculado fue de 56 x10 6 m 3 , indicando la dispo - nibilidad del recurso hídrico subterráneo para potencializar las actividades socioeconómicas en la zona, bajo una planeación optima del recurso.

  15. SOLERA 2.0: un software para la gestión y control de bodegas de añejamiento

    Directory of Open Access Journals (Sweden)

    Arnaldo Díaz-Molina

    2012-01-01

    Full Text Available Solera es un sistema para la gestión de información en las bodegas de añejamiento de una fábrica de ron. Su configuración dinámica le permite adaptarse a cualquier tipo de fábrica, independientemente de su organización y/o productos almacenados. Posibilita el registro de bodegas, tipos de depósitos, productos, clasificación de extracciones, toneles, y los movimientos de agregación y extracción de bebidas sobre cada tonel; genera, en cada caso, gran parte de la información necesaria. Registra los procesos de llenado y vaciado de varios toneles de forma automática, así como su traslado en caso de ser necesario. Calcula automáticamente el añejamiento de cada tonel. Lleva un control estricto de las bajas producidas en cada bodega. Garantiza la obtención de reportes configurables que sirven para realizar análisis estadísticos y/o controlar eficientemente las actividades realizadas en cada bodega. Está instalado en el Centro de Referencia de Alcoholes y Bebidas (CERALBE perteneciente al ICIDCA, su instalación en otras roneras es posible.

  16. CARACTERIZACIÓN QUÍMICA DEL GRANO MOLIDO Y LA TORTA DE SOYA DESGRASADA (Glycine max, Merr; VAR. INCA SOY 24 QUE SE EMPLEAN EN EL MEDIO DE CULTIVO PARA Bradyrhizobium elkanii

    Directory of Open Access Journals (Sweden)

    Aida T. Rodríguez

    2004-01-01

    Full Text Available Algunos derivados de la soya se han utilizado como medio de cultivo para Bradyrhizobium, demostrándose su efecto positivo sobre la dinámica de crecimiento de estos microorganismos, así como su poder inductor sobre la expresión de los genes de nodulación. El presente trabajo se llevó a cabo en el Departamento de Fisiología y Bioquímica Vegetal, perteneciente al Instituto Nacional de Ciencias Agrícolas (INCA, donde se realizó la caracterización química del grano molido y la torta desgrasada de soya, a los cuales se les realizaron tres extracciones sucesivas con solventes de polaridad creciente. Se realizó el correspondiente tamizaje fitoquímico y posteriormente se cuantificaron las proteínas y los carbohidratos reductores. Se observó en ambos materiales la presencia de triterpenos, esteroides, quinonas, agrupamientos lactónicos, aminoácidos, aminas, lípidos, aceites, carbohidratos reductores, mucílagos, flavonoides y proteínas. La cuantificación de proteínas y carbohidratos reductores evidenció que el grano molido exhibe mayor concentración de ambos compuestos que la torta desgrasada.

  17. Geochemical evidences of the boiling phenomena in Los Humeros geothermal field; Evidencias geoquimicas del fenomeno de ebullicion en el campo de Los Humeros

    Energy Technology Data Exchange (ETDEWEB)

    Munguia Bracamontes, Fernando; Lopez Mendiola, Juan Manuel [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1989-12-31

    The geochemical behavior of the fluids in the geothermal field Los Humeros suggests the existence of a reservoir of relatively low permeability, with hydrostatic pressure gradients and thermodynamic conditions of pressure-temperature close to the boiling point in stationary conditions, that is, non-disturbed. Nevertheless, the fluid geochemistry also indicates the presence of steam under stationary conditions, mainly in the fault, fracture, fissure, etc. zones. The steam diminishes progressively as the extraction time increases, being replaced by boiling fluid. [Espanol] El comportamiento geoquimico de los fluidos en el campo geotermico de Los Humeros sugiere la existencia de un yacimiento de relativa baja permeabilidad, con gradientes de presion hidrostatica y condiciones termodinamicas de presion-temperatura cercanas al punto de ebullicion a condiciones estables; es decir, no perturbadas. Sin embargo, la geoquimica de los fluidos tambien indica la existencia de vapor bajo condiciones estables, principalmente en las zonas de fallas, fracturas, fisuras, etc. El vapor disminuye progresivamente conforme aumenta el tiempo de extraccion, siendo reemplazado por fluido en ebullicion.

  18. Municipal hydraulic planning for energy saving; Planeacion hidraulica municipal para el ahorro de energia

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Garcia, Enrique [PTF S.C. Consultores, Leon, Gto. (Mexico)

    1999-07-01

    The efficient handling of the economic and natural resources of the municipalities, is nowadays so much complex, that it requires a formal planning. In the public service of potable water supply, two fundamental approaches are conjugated to consider: the rational use of the water resource and the efficient use of the electrical energy, for its extraction from the underground deep reservoirs. In the paper that is presented, the individual features of the previous matters are described and the positive results in a municipality of the Guanajuato's Low Lands (Bajio ), where already the dual objectives are obtained and that with a more professional municipal hydraulic planning, these will be permanent, with the inherent benefit towards the population. [Spanish] El manejo eficiente de los recursos economicos y naturales de los municipios, es hoy en dia cada vez mas complejo, que requiere una planeacion formal. En el servicio publico de abastecimiento de agua potable, se conjugan dos enfoques primordiales a considerar: el uso racional del recurso agua y la utilizacion eficiente de la energia electrica, para su extraccion de los acuiferos subterraneos profundos. En el trabajo que se presenta, se describen las particularidades de lo anterior y los resultados positivos en un municipio del Bajio guanajuatense, donde ya se logran los objetivos duales y que con una planeacion hidraulica municipal mas profesional, estos seran permanentes, con el beneficio inherente hacia la poblacion.

  19. Estudio cinético del proceso de precipataión de los sulfuros de níquel y cobalto con hidrógeno sulfuro de sodio, en el licor de desecho (WL

    Directory of Open Access Journals (Sweden)

    Mercedes Sosa-Martínez

    2006-03-01

    Full Text Available En el trabajo se realiza un estudio cinético del proceso de precipitación de sulfuros a partir del licor residual WL que se genera en la Empresa Moa Níckel S. A -Pedro Soto Alba. La investigación se realiza a escala de laboratorio empleando una variante de tratamiento del licor en dos etapas de precipitación a diferentes valores de pH, donde se analiza la influencia de los factores que intervienen en el proceso como la temperatura, concentración de hidrógeno sulfuro de sodio y el régimen de agitación, basado en el método factorial completo donde se conjugan los niveles experimentales de las variables estudiadas respecto al grado de precipitación de los principales elementos níquel cobalto, cinc, y cobre. En la primera etapa se logra obtener una mezcla de sulfuros mixtos ricos en  cobre y cinc con extracciones superiores  a  80 % y 64 % respectivamente, mientras que en la segunda etapa se obtiene un precipitado de color negro correspondiente a los sulfuros de níquel y cobalto cuyas recuperaciones alcanzan valores de 84% y  82%.

  20. Identificación de Yarrowia lipolytica (Ascomycota: Hemiascomycetes como contaminante en la obtención de amplificados del gen 28S rRNA de moluscos

    Directory of Open Access Journals (Sweden)

    Jenny Chirinos

    2011-05-01

    Full Text Available En el presente trabajo se identifica una secuencia de DNA no esperada proveniente de los amplificados del gen 28S rRNA de moluscos terrestres. Las extracciones de DNA se realizaron del tejido del pie de caracoles terrestres por el método del CTAB modificado. Las PCRs fueron llevadas a cabo con primers universales para el gen COI e iniciadores diseñados para moluscos, para el marcador 16S rRNA, 28S rRNA y la región ITS-2. Los tamaños aproximados de las bandas de los amplificados de moluscos fueron de 706 pb para el COI, 330 pb para el 16S rRNA, 900 pb para el ITS-2 y 583 pb para el 28S rRNA; un amplificado del último marcador fue de una longitud inesperada, ~340 pb. Las secuencias de DNA fueron comparadas con la base de datos del GenBank mediante el programa BLASTn y la muestra con la banda de tamaño inesperado resultó en un 100% de identidad y cobertura del 99% con el gen 26S rRNA de la levadura Yarrowia lipolytica. El análisis filogenético con Neighbour-Joining y los valores de divergencia confirmaron la identificación, proporcionando resultados que apoyan la ubicación taxonómica de la especie dentro del clado de los Hemiascomycetes.

  1. Exodoncia en pacientes geriátricos con bifosfonatos

    Directory of Open Access Journals (Sweden)

    N. Martínez-Rodríguez

    2015-06-01

    Full Text Available En el paciente geriátrico, resulta común la presencia de enfermedades sistémicas, lo que conlleva a un consumo de diferentes fármacos para el tratamiento de las mismas. Uno de los más frecuentes son los bifosfonatos. Por lo general, los bifosfonatos son fármacos bien tolerados si se administran correctamente, aunque en los últimos años también se han descrito diferentes efectos adversos asociados a su consumo, siendo la osteonecrosis maxilar uno de lo más importantes. Desde entonces son numerosos los casos publicados en los cuales se afirma que los procedimientos quirúrgicos menores como las exodoncias podrían ser uno de los factores desencadenantes. En el caso de los bifosfonatos intravenosos, dado que el riesgo es mucho mayor, se sugiere evitar en lo posible los tratamientos quirúrgicos orales como las extracciones mientras que en los tratamientos con bifosfonatos orales no se puede contraindicar dichos tratamientos de esa manera tan categórica Ante esta situación resulta evidente la necesidad de establecer unos protocolos definitivos encaminados a la prevención y tratamiento de esta posible complicación que pudiese acontecer.

  2. Extracción de sustancias asistida por ultrasonido (EUA

    Directory of Open Access Journals (Sweden)

    Rocío Azuola

    2007-11-01

    Full Text Available Compuestos presentes en los vegetales con propiedades funcionales o tecnológicas, han cobrado gran importancia en los mercados de alimentos, farmacéuticos y cosméticos. Se buscan métodos eficientes, económicos y favorables al ambiente para la extracción de estas sustancias. Se ha realizado un estudio bibliográfico de las publicaciones recientes sobre diferentes métodos de extracción y su comparación a las extracciones asistidas por ultrasonido (EAU con el fin de evaluar su eficacia y viabilidad industrial. Se ha encontrado que la EAU es más eficiente que los métodos de extracción tradicionales, y más económica y sencilla que los métodos de extracción no tradicionales como la extracción asistida por microondas, por lo cual se comprueba su viabilidad industrial.

  3. Analysis of the problems of induced draft fans in a carbo-electric power station; Analisis de la problematica de ventiladores de tiro inducido de una central carboelectrica

    Energy Technology Data Exchange (ETDEWEB)

    Diaz Sanchez, Valentin de Jesus; Vital Flores, Francisco [LAPEM, Comision Federal de Electricidad (Mexico)

    2007-11-15

    The induced draft fans of the 350 MW units of a Thermo-electric power plant presented problems consisting of the failure of the capacity of gases extraction, together with the presence of cracks in the blades; this condition was observed since the stage of putting into service. Consequently, losses have been originated in the availability in two units, as well as, losses due to the manufacture of new impellers, which also originated that, in some cases, that the measures of the impellers, locally manufactured, differed from the originals, resulting in differences in the unit's efficiency. [Spanish] Los ventiladores tiro inducido de las unidades de 350 MW de una Central Termoelectrica presentaban una problematica consistente en la falla de capacidad de extraccion de gases, aunado a la presencia de fracturas en las aspas de los impulsores, esta condicion se observo desde la etapa de puesta en servicio. En consecuencia se han ocasionado perdidas de disponibilidad en dos unidades, asi como tambien, perdidas debido a la fabricacion de nuevos impulsores, lo que tambien origino que, en algunos casos, las medidas de los impulsores, fabricados localmente, diferian de los originales, dando como resultado diferencias en la eficiencia de las unidades.

  4. Structural solution to the problem of differential settlement of the Venta de Carpio surface piping; Solucion estructural al problema de hundimientos diferenciales en las tuberias superficiales de Venta de Carpio

    Energy Technology Data Exchange (ETDEWEB)

    Vilar R, J. Ivan; Espejel V, Eduardo; Melchor G, Nicolas; Alanis V, Armandina; Munoz B, Celso J; Avendano P, Lorenzo; Alvarado G, Alonso [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2004-07-01

    The Venta de Carpio Terminal (TVC) is located in the municipality of Acolman, State of Mexico, with geographical coordinates 19 37' of Northern latitude, 98 58' Western longitude and an altitude of 2,283 m over the mean sea level. This terminal is one of the points of greater importance in the system of fuels transport and gas distribution so much as of PEMEX Gas y Petroquimica Basica (PGPB) as of PEMEX Refinacion (PR). The zone where the TVC is located presents a regional collapse due to the extraction of the subsoil water, which can cause damages to this terminal piping systems. As a solution to this problem it is proposed a process of re-lay the foundations of the supports for the mentioned piping systems. [Spanish] La Terminal Venta de Carpio (TVC) se localiza en el municipio de Acolman, Estado de Mexico, con coordenadas geograficas 19 37' de latitud Norte, 98 58' longitud Oeste y una altura de 2,283 m sobre el nivel medio del mar. Esta terminal es uno de los puntos de mayor importancia en el sistema de transporte y distribucion de energeticos tanto de Pemex Gas y Petroquimica Basica (PGPB) como de Pemex Refinacion (PR). La zona donde se ubica la TVC presenta un hundimiento regional debido a la extraccion del agua del subsuelo, lo que puede ocasionar danos a las tuberias de esta terminal. Como solucion a este problema se propone un proceso de recimentacion de los soportes para las tuberias mencionadas.

  5. Alternativas para la recuperación y mantenimiento de playas, su relación con la educación ambiental. Varadero, una experiencia.

    Directory of Open Access Journals (Sweden)

    Beatriz Consuegra Lezcano

    2010-10-01

    Full Text Available Varadero, por su parte, no está exento del paulatino deterioro que ha ido sufriendo la playa debido a causas naturales y antrópicas, por lo que se ha decidido poner en práctica un plan de medidas para proteger su entorno. Con este fin y basándose en los estudios realizados por el Instituto de Oceanología fundamentalmente, la Delegación Territorial del CITMA en Matanzas en coordinación con el Ministerio del Turismo, han llevado a cabo la ejecución práctica de dicho plan, el cual comprende varios aspectos como son: la protección a instalaciones turísticas priorizadas, la eliminación de las extracciones de arena en la duna y la parte sumergida de la playa, la demolición de las construcciones sobre la duna, la orientación para la construcción de las nuevas instalaciones más acordes al entorno y la regeneración y el mantenimiento periódico a los sectores más afectados, así como la información de todas estas acciones a través de un programa de Educación Ambiental dirigido al personal del turismo y a la población en general.

  6. Detección por cromatografía de capa fina (CCF de metabolitos antinfúngicos producidos de Pseudomonas aeruginosa cepa PSS

    Directory of Open Access Journals (Sweden)

    Magdalena Lorenzo

    2006-01-01

    Full Text Available Se muestran los resultados preliminares obtenidos de la detección de extractos orgánicos de metabolitos antifúngicos de Pseudomonas aeruginosa cepa PSS por cromatografía de capa fina (CCF. Las extracciones fueron llevadas a cabo con acetato de etilo y la fase orgánica se analizó por TLC empleando el sistema de solvente cloroformo: acetona (3:1 como fase móvil. Para discernir el metabolito con actividad antifúngica se realizó un ensayo de Bioautografía utilizando el hongo Aspergillus flavus. Como resultado, se observó una mancha con Rf entre 0.70-0.80 detectada a luz ultravioleta (255 nm y revelada con vainillina que presenta actividad antifúngica, por lo que es posible de una manera preliminar detectar los metabolitos antifúngicos mediante la combinación de estos dos métodos.

  7. EXTRACCIÓN DE PLAGUICIDAS EN SUELO EMPLEANDO DIÓXIDO DE CARBONO SUPERCRÍTICO-COSOLVENTES

    Directory of Open Access Journals (Sweden)

    Jose Forero

    2010-04-01

    Full Text Available En este estudio se evaluó la eficiencia de tres solventes orgánicos (acetato de etilo, metanol y acetona empleados como cosolventes en la extracción con fluidos supercríticos (EFS de una mezcla de plaguicidas con diferentes características fisicoquímicas. Los análisis se realizaron por medio de cromatografía de gases con detección simultánea por microcaptura electrónica (_ECD y nitrógeno-fósforo (NPD acoplados en paralelo. Se hicieron extracciones a muestras de suelo fortificadas con los plaguicidas empleando dióxido de carbono supercrítico (CO2SC como fase extractante a 35 ºC y 14 MPa adicionando 10 mL de cada cosolvente. Se encontró que el metanol ofrece la mayor eficiencia en el proceso de extracción obteniendo valores de recuperación entre 51,24 y 123,50%.

  8. Energy optimization in industrial drying systems; Optimizacion energetica en sistemas de secado industrial

    Energy Technology Data Exchange (ETDEWEB)

    Alarcon, Daniel; Ambriz, Juan Jose; Romero Paredes, Hernando [Universidad Autonoma Metropolitana-Iztapalapa, Mexico, D. F. (Mexico)

    1994-12-31

    The drying of products -meaning the extraction of water or excess humidity down to adequate levels for its conservation and final presentation- demands a large amount of energy, mainly from fuels of fossil origin. Nevertheless, from the standpoint of the energy efficiency, the burning of fuels at very high temperature for using them at a very low temperature, represents an astonishing energy waste, which can be clearly established by means of an energy and exergy balance of these drying installations. In this study the methodology for the energy analysis for industrial drying systems is presented and it is applied to different practical cases. The efficiency of the entire system is evaluated and the losses for each concept, in order to obtain the potential energy saving. [Espanol] El secado de productos, entendido como la extraccion de agua o humedad en exceso, hasta niveles adecuados para su conservacion o presentacion final, demanda una gran cantidad de energeticos, principalmente de origen fosil. No obstante, desde el punto de vista de la eficiencia energetica, el quemar combustible a muy alta temperatura para emplearlos a una muy baja, representa un dispendio energetico impresionante, lo cual puede ser claramente establecido mediante el balance energetico y exergetico de dichas instalaciones de secado. En el presente estudio se presenta la metodologia de analisis energetico de sistemas industriales de secado y se aplica a distintos casos practicos. Se evalua la eficiencia total del sistema y las perdidas por cada concepto con la finalidad de obtener los potenciales de ahorro de energia.

  9. [Erythropoietin as a protective factor in rat CNS cells receiving radiotherapy -an in vitro study].

    Science.gov (United States)

    Gomez-De la Riva, Álvaro; Isla-Guerrero, Alberto; García-Grande, Antonio

    2014-03-01

    Objetivo. Investigar el efecto de la eritropoyetina en cultivos celulares de corteza cerebral de ratas cuando se administra radioterapia. Materiales y metodos. El estudio se desarrolla con la obtencion de corteza cerebral de embriones de 17 dias de preñez de ratas Wistar. Las celulas cultivadas despues de 72 horas de la extraccion de la corteza se dividieron en dos grupos, a uno de ellos se le administro eritropoyetina alfa a una concentracion de 30 pM y el otro era el grupo control. A los dos grupos de celulas se les radio con 6 Gy mediante un aparato Phoenix. Tras la radioterapia permanecieron 24 horas en la incubadora antes de fijarlas. Las celulas fueron fijadas con formaldehido al 4%. A continuacion, con la tecnica de TUNEL, se valoro el numero de celulas apoptoticas en los cultivos radiados. Resultados. Se observo un porcentaje de apoptosis del 25,22% del grupo de cultivo sin eritropoyetina, mientras que en el grupo de celulas radiadas con eritropoyetina fue del 15,5%. Las variables cuantitativas se analizaron mediante el test t de Student y el resultado de la comparacion entre los dos grupos fue estadisticamente significativo (p sistema nervioso central de ratas por radiacion. Esto abre nuevos campos para la investigacion del efecto protector del sistema nervioso.

  10. 230Th, 232Th and 238U determinations in phosphoric acid fertilizer and process products by ICP-MS

    International Nuclear Information System (INIS)

    Through processing of Santa Quiteria-CE mine phosphate rock, Brazil has established a project for production of phosphoric acid fertilizer and uranium as a by-product. Under leaching conditions of phosphate rock with sulfuric acid, which is the common route for preparing phosphoric acid fertilizer, a large part of uranium, thorium and their decay products naturally present in the rock are solubilized. In order to assess the contamination potential in phosphoric acid and others process products, this paper describes a previous precipitation and direct methods for routine analysis of thorium and uranium isotopes by ICP-MS. In all samples, 230Th, 232Th and 238U were directly determined after dilution, except 230Th in phosphoric acid loaded with uranium sample, which to overcome equipment contamination effect, was determined after its separation by oxalate precipitation using lanthanum as a carrier. The results obtained by the proposed method by ICP-MS, were in good agreement when compared to alpha spectrometry for 230Th, and ICP-OES and spectrophotometry with arsenazo III for elementary uranium and thorium determinations. (author)

  11. Calcium uptake and proton transport by acidocalcisomes of Toxoplasma gondii.

    Directory of Open Access Journals (Sweden)

    Peter Rohloff

    Full Text Available Acidocalcisomes are acidic calcium stores found in diverse organisms, being conserved from bacteria to humans. They possess an acidic matrix that contains several cations bound to phosphates, which are mainly present in the form of short and long polyphosphate chains. Their matrix is acidified through the action of proton pumps such as a vacuolar proton ATPase and a vacuolar proton pyrophosphatase. Calcium uptake occurs through a Ca(2+/H(+ countertransporting ATPase located in the membrane of the organelle. Acidocalcisomes have been identified in a variety of microorganisms, including Apicomplexan parasites such as Plasmodium and Eimeria species, and in Toxoplasma gondii. We report the purification and characterization of an acidocalcisome fraction from T. gondii tachyzoites after subcellular fractionation and further discontinuous iodixanol gradient purification. Proton and calcium transport activities in the fraction were characterized by fluorescence microscopy and spectrophotometric methods using acridine orange and arsenazo III, respectively. This work will facilitate the understanding of the function of acidocalcisomes in Apicomplexan parasites, as we can now isolate highly purified fractions that could be used for proteomic analysis to find proteins that may clarify the biogenesis of these organelles.

  12. {sup 230}Th, {sup 232}Th and {sup 238}U determinations in phosphoric acid fertilizer and process products by ICP-MS

    Energy Technology Data Exchange (ETDEWEB)

    Nascimento, Marcos R.L. do; Guerreiro, Luisa M.R.; Bonifacio, Rodrigo L.; Taddei, Maria H.T., E-mail: pmarcos@cnen.gov.br [Comissao Nacional de Energia Nuclear (LAPOC/CNEN-MG), Pocos de Caldas, MG (Brazil). Laboratorio de Pocos de Caldas

    2015-07-01

    Through processing of Santa Quiteria-CE mine phosphate rock, Brazil has established a project for production of phosphoric acid fertilizer and uranium as a by-product. Under leaching conditions of phosphate rock with sulfuric acid, which is the common route for preparing phosphoric acid fertilizer, a large part of uranium, thorium and their decay products naturally present in the rock are solubilized. In order to assess the contamination potential in phosphoric acid and others process products, this paper describes a previous precipitation and direct methods for routine analysis of thorium and uranium isotopes by ICP-MS. In all samples, {sup 230}Th, {sup 232}Th and {sup 238}U were directly determined after dilution, except {sup 230}Th in phosphoric acid loaded with uranium sample, which to overcome equipment contamination effect, was determined after its separation by oxalate precipitation using lanthanum as a carrier. The results obtained by the proposed method by ICP-MS, were in good agreement when compared to alpha spectrometry for {sup 230}Th, and ICP-OES and spectrophotometry with arsenazo III for elementary uranium and thorium determinations. (author)

  13. Effect of Ca and Mg Impurity Substances on the Efficiency of Decreasing Uranium Concentration in the Waste Water

    International Nuclear Information System (INIS)

    Study of uranium waste water treatment contained Ca and Mg impurity substances using ion exchange has been experimentally investigated. This experiment was conducted by the glass column of 1.1 cm diameter containing resin Dowex 50-X8(Na). Feed of 100 ppm uranium solution at the pH of 4 with Ca and Mg impurities varied from 25, 50, 75 and 100 ppm was flown into the column of resin using masterflex pump at the constant flowrate of 2.5 ml/min. The effluents concentration of uranium flowing out of column' s resin were analyzed using spectrophotometer with arsenazo as the complexing agent. From the data of uranium concentration entering into and exiting from the column's resin could be determined the efficiency of minimization' s value of uranium concentration. From the experimental data, the efficiency of minimization' s value of uranium concentration obtained with the impurity of Ca from 99.1 % to 92 % while which the impurity of Mg from 97.8 % to 94 %. (author)

  14. Chemical, mass spectrometric, spectrochemical, nuclear and radiochemical analysis of nuclear-grade plutonium metal

    International Nuclear Information System (INIS)

    These analytical procedures are designed to show whether a given material meets the purchaser's specifications as to plutonium content, effective fissile content, and impurity content. The following procedures are described in detail: dissolution procedure; plutonium by controlled-potential coulometry; plutonium by amperometric titration with iron(II); plutonium by ceric sulfate titration method; uranium by Arsenazo I spectrophotometric method; thorium by thorin spectrophotometric method; iron by 1,10-phenanthroline spectrophotometric method; iron by 2,2'-bipyridyl spectrophotometric method; chloride by the thiocyanate spectrophotometric method; fluoride by distillation-spectrophotometric method; nitrogen by distillation-Nessler reagent spectrophotometric method; carbon by the direct combustion-thermal conductivity method; sulfur by distillation-spectrophotometric method; isotopic composition by mass spectrometry; Americium-241 by extraction and gamma counting; Americium-241 by gamma counting; gamma-emitting fission products, uranium, and thorium by gamma-ray spectroscopy; rare earths by copper spark spectrochemical method; tungsten, niobium (columbium) and tantalum by spectrochemical method; sample preparation for spectrographic analysis for trace impurities

  15. Sodium dodecyl sulfate coated alumina modified with a new Schiff's base as a uranyl ion selective adsorbent

    International Nuclear Information System (INIS)

    A simple and selective method was used for the preconcentration and determination of uranium(VI) by solid-phase extraction (SPE). In this method, a column of alumina modified with sodium dodecyl sulfate (SDS) and a new Schiff's base ligand was prepared for the preconcentration of trace uranyl(VI) from water samples. The uranium(VI) was completely eluted with HCl 2 M and determined by a spectrophotometeric method with Arsenazo(III). The preconcentration steps were studied with regard to experimental parameters such as amount of extractant, type, volume and concentration of eluent, pH, flow rate of sample source and tolerance limit of diverse ions on the recovery of uranyl ion. A preconcentration factor more than 200 was achieved and the average recovery of uranyl(VI) was 99.5%. The relative standard deviation was 1.1% for 10 replicate determinations of uranyl(VI) ion in a solution with a concentration of 5 μg mL-1. This method was successfully used for the determination of spiked uranium in natural water samples.

  16. Decomposed characteristic of azo dyes by ozonization with ultrasonic enhancement

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    Azo dyes have been used in many industries (textile mill, printing and dyeing mill, paper and pulp mill) and have caused great environmental pollution due to complicated constitution and high chemical stability. The construction of azo dyes can be destroyed by ozonization, but not thoroughly when the ozone dosage is controlled to a certain extent and the operating cost is higher. Ozonization decomposed ability with ultrasonic enhancement on azo dyes has been demonstrated in the study. The conclusion derived from this investigation may be summarized as follows: (1) The decoloration rate of arsenazoⅠsolutions during sonozone treatment is more rapid than the rate obtained with ozone alone because the complicated constitution has been destroyed by the O free radical from ozone decomposition. (2) The destructing pathway of arsenazoⅠby ozone with ultrasound is identical with that of by ozone alone: the breakdown of -N== N- bonds, the conversion of benzene ring to carboxylic acid, and -HSO3 bonds to H2SO4. So, pH value of the arsenazo Ⅰ solution continuously drops down to 3.2.

  17. Solid phase extraction of uranium (VI) using penicillium chrysogenum immobilized on silica gel

    International Nuclear Information System (INIS)

    Uranium is a metal of strategic importance in the area of Nuclear Technology. It has due to its usage in power generation. Being a toxic element and due to environmental concerns its determination from water, soil and other samples has gained significance. The determination of traces of uranium in such samples requires a preconcentration step. Biosorption methods involving solid phase extraction utilizes various materials of biological origin, including bacteria, fungi, yeast, algae, etc. In the present work a solid phase extraction method for separation and enrichment of uranium (VI) was developed. A solid phase was prepared by immobilization 150 mg of Penicillium and 1.0 g silica. A 350 mg of Penicillium chrysogenum immobilized silica mixed with double distilled water packed in a glass column (150 mm length and 10 mm internal diameter) with wool as support and was systematically investigated to optimize the conditions for quantitative sorption and desorption of uranium (VI). It was determined spectrophotometrically using Arsenazo (III) at 650 nm

  18. [Thapsigargin-sensitive and insensitive intracellular calcium stores in acinar cells of the submandibular salivary gland in rats].

    Science.gov (United States)

    Kopach, O V; Kruhlykov, I A; Voĭtenko, N V; Fedirko, N V

    2005-01-01

    Acinar cells of rat submandibular salivary gland are characterized by heterogeneity of intracellular Ca2+ stores. In the present work we have studied this heterogeneity using Arsenazo III dye to measure a cellular total calcium content and Fura-2/AM, to determine free cytosolic calcium concentration ([Ca2+]i). We have found that the amount of Ca2+ released by inhibition of Ca2+ ATPase of the ER with thapsigargin comprises approximately 30% of total ER calcium. This result was obtained in experiments on both intact and permeabilized acinar cells. We have also shown that both Ca2+ ATPase inhibition with thapsigargin and emptying the stores with acetylcholine (ACh) led to activation of store-operated Ca2+ influx (an increase in total calcium content of approximately 14%). In permeabilized cells application of ACh after preincubation with thapsigargin led to a further decrease in total cellular calcium content (approximately 38%). At the same time in intact cells it resulted in generation of [Ca2+]i transients with gradually decreasing amplitudes. Thus, ACh is capable of producing an additional release of Ca2+ from thapsigargin-insensitive stores. This additional release is IP3-dependent since it was completely blocked by heparin. We conclude that in acinar cells of rat submandibular gland thapsigargin-sensitive and thapsigargin-insensitive Ca2+ stores could exist.

  19. Extracted species of rare earth elements using bis(1,1,3,3-tetramethylbutyl)phosphinic acid as an extractant and their effective mutual separation by high-performance extraction chromatography

    Energy Technology Data Exchange (ETDEWEB)

    Wang Qiu-quan; Huang Ben-li [Department of Chemistry and the Key Laboratory of Analytical Sciences of MOE, Xiaman Univ., Xiamen (China); Tsunoda, Kin-ichi; Akaiwa, Hideo

    1999-12-01

    The possible extracted species of rare earth elements (REE) in bis(1,1,3,3-tetramethylbutyl) phosphinic acid (Hmbp)/cyclohexane-HNO{sub 3} system was proposed by a log-log plot analysis and a saturated extraction method as being [M(mbp){sub 3}(Hmbp){sub 3}] (M = REE). It was also verified by IR, {sup 1}HNMR spectra and element analysis of lutetium-Hmbp extracted species. The effective mutual separation of REEs was achieved on the Hmbp modified C-18 column by a pH gradient elution. Moreover, the degree of the mutual separation of europium(III) from gadolinium(III) was remarkably improved by adding glycolic acid in the mobile phase. A fine concentrate of Sm{sub 2}O{sub 3}, EU{sub 2}O{sub 3}, and Gd{sub 2}O{sub 3} from a rare earths smeltery was analyzed by the present method with the spectrophotometric detection after postcolumn derivatization with Arsenazo III. (author)

  20. La, Ce, Pr and Nd determination in cerium dioxide-based polishing powders using the method of reverse ion interaction chromatography

    International Nuclear Information System (INIS)

    A procedure has been elaborated for the determination of the major components of polishing powders based on cerium dioxide (lanthanum, cerium, praseodymium and neodymium) by reversed-phase high-performance liquid chromatography. The samples are decomposed by heating with hydrobromic acid, and the bromide ions are then eliminated by addition of nitric acid and hydrogen peroxide. The separation is carried out on a column packed with a sorbent with bonded octadecyl groups, Separon SGX RPS, using a mobile phase containing 2 mmol/l of tetrabutylammonium hydroxide, 2 mmol/l of oxalic acid and 2 mmol/l of NaClO4, at pH 4.5. Detection is based on postcolumn derivatization with Arsenazo III. A detection limit at the level of several ng was achieved for the injected sample volume of 20 μl. The results of the analyses are in a good agreement with the results obtained by X-ray fluorescence analysis. (author) 2 tabs., 2 figs., 23 refs

  1. Continuous determination of the Zr-Fe-Y Content by EDTA titrimetry%EDTA滴定法连续测定锆-铁-钇含量

    Institute of Scientific and Technical Information of China (English)

    袁履璀; 向斌; 赵娜

    2013-01-01

    In order to accurately measure the content of Zr, Fe and Y in the acidic solution which produced by recycling waste zirconium-yttrium ceramics, the influences of the iron ion masking agent including acetylacetone, triethanolamine, citric acid and the indicator such as arsenazo M hydrate, methyl thymol blue and xylenol orange on the determination results were investigated in this paper. Finally, a satisfactory result has been achieved by EDTA titrimetry when xylenol orange and hydroxylamine hydrochloride acted as the only indicator and reducing agent, respectively. The RSD was smaller than 2% .%探讨了准确测定废旧锆钇陶瓷回收时产生的酸性溶液中锆、铁、钇的含量时,乙酰丙酮、三乙醇胺和柠檬酸等铁离子掩蔽剂,以及偶氮砷Ⅲ、甲基百里酚蓝和二甲酚橙等指示剂对测定结果的影响,确定仅以二甲酚橙为指示剂,盐酸羟胺为还原剂,用EDTA滴定法连续测定了溶液中的锆、铁、钇含量,测定结果的RSD <2%.

  2. Chemical, mass spectrometric, spectrochemical, nuclear, and radiochemical analysis of nuclear-grade uranyl nitrate solutions

    International Nuclear Information System (INIS)

    The standard covers analytical procedures to determine compliance of nuclear-grade uranyl nitrate solution to specifications. The following methods are described in detail: uranium by ferrous sulfate reduction-potassium dichromate titrimetry and by ignition gravimetry; specific gravity by pycnometry; free acid by oxalate complexation; thorium by the Arsenazo(III) (photometric) method; chromium by the diphenylcarbazide (photometric) method; molybdenum by the thiocyanate (photometric) method; halogens separation by steam distillation; fluorine by specific ion electrode; halogen distillate analysis: chloride, bromide and iodide by amperometric microtitrimetry; bromine by the fluorescein (photometric) method; sulfate sulfur by (photometric) turbidimetry; phosphorus by the molybdenum blue (photometric) method; silicon by the molybdenum blue (photometric) method; carbon by persulfate oxidation-acid titrimetry; nonvolatile impurities by spectrography; volatile impurities by rotating-disk spark spectrography; boron by emission spectrography; impurity elements by spark source mass spectrography; isotopic composition by multiple filament surface-ionization mass spectrometry; uranium-232 by alpha spectrometry; total alpha activity by direct alpha counting; fission product activity by beta and gamma counting; entrained organic matter by infrared spectrophotometry

  3. Smart thorium and uranium determination exploiting renewable solid-phase extraction applied to environmental samples in a wide concentration range.

    Science.gov (United States)

    Avivar, Jessica; Ferrer, Laura; Casas, Montserrat; Cerdà, Víctor

    2011-07-01

    A smart fully automated system is proposed for determination of thorium and uranium in a wide concentration range, reaching environmental levels. The hyphenation of lab-on-valve (LOV) and multisyringe flow injection analysis (MSFIA), coupled to a long path length liquid waveguide capillary cell, allows the spectrophotometric determination of thorium and uranium in different types of environmental sample matrices achieving high selectivity and sensitivity levels. Online separation and preconcentration of thorium and uranium is carried out by means of Uranium and TEtraValents Actinides resin. The potential of the LOV-MSFIA makes possible the full automation of the system by the in-line regeneration of the column and its combination with a smart methodology is a step forward in automation. After elution, thorium(IV) and uranium(VI) are spectrophotometrically detected after reaction with arsenazo-III. We propose a rapid, inexpensive, and fully automated method to determine thorium(IV) and uranium(VI) in a wide concentration range (0-1,200 and 0-2,000 μg L(-1) Th and U, respectively). Limits of detection reached are 5.9 ηg L(-1) of uranium and 60 ηg L(-1) of thorium. Different water sample matrices (seawater, well water, freshwater, tap water, and mineral water), and a channel sediment reference material which contained thorium and uranium were satisfactorily analyzed with the proposed method.

  4. Catalytic spectrophotometric determination of trace vanadium in fly ash and coal gangue by Triton X-100 enhancing effect

    Institute of Scientific and Technical Information of China (English)

    XIA Changbin; HUANG Niandong

    2004-01-01

    Trace V(V) catalyzes mightily the decolorization reaction of arsenazo Ⅲ (AsA Ⅲ) by oxidizing with H2O2 in a pH 4.0 HAc-NaAc buffer solution, and the addition of Triton X-100 can further increase the sensitivity of the reaction and its catalytic extent is linear with the content of V(V). A catalytic spectrophotometric procedure for determining trace V(V)was developed. The results show that the maximun absorption of the color solution is at 560 nm and the detection limit of the method for V(V) is 0.014 mg@L-1 Beer's law is obeyed for V(V) in the range of 0.00-0.20 mg.L-1. The recoveries are 99.0%-104.6%, and the relative standard deviations (RSD) are 2.7%-3.7%. Combined with ion-exchange resin, the method has been applied to the determination of trace vanadium in fly ash and coal gangue with satisfactory results.

  5. Preconcentration of uranium in seawater with heterocyclic azo dyes supported on silica gel

    International Nuclear Information System (INIS)

    The chelating adsorbents, heterocyclic azo dyes supported on silica gel, were prepared and their adsorption behaviors of metal ions were investigated. The 1-(2-pyridylazo)-2-naphthol(PAN)-SG and 2-(2-thiazolylazo)-p-cresol(TAC)-SG show greater affinity for UO2(II) and ZrO(II), compared with the other metal ions like Cu, Cd, Fe and alkaline earths. Trace uranyl can be quantitatively retained on the column of the gels at neutral pH region and flowrate 3-4 ml/min. The uranyl retained is easily eluted from the column bed with a mixture of acetone and nitric acid (9:1 v/v) and determined by spectrophotometry using Arsenazo-III. Matrix components in seawater do not interfere and the spiked recovery of uranyl in artificial seawater was found to be average 98.6%, with the relative standard deviation of 1.08%. Both gels were applied to the determination of uranium in seawater with satisfactory results. 16 references, 3 figures, 3 tables

  6. Implementation of an analytical technique for Samarium; Implementacion de una tecnica analitica para Samario

    Energy Technology Data Exchange (ETDEWEB)

    Garcia G, N. [ININ, Carretera Mexico-Toluca Km. 36.5, 52045 Estado de Mexico (Mexico)

    2004-07-01

    Since the Samarium presents the same chemical properties that the plutonium, it has been used as homologous in studies that allow us to know the behavior that the plutonium presents in solution, with the advantage of working with an inactive and not very dangerous element. At the moment studies of sorption of plutonium or samarium are made on some mineral matrices that present certain surface properties. Due to the low concentrations that are used in the studies of sorption of samarium on those reagent substrates, their detection becomes very difficult for the conventional analysis media. The luminescence is a technique that can detect lower concentrations, smaller at 1 X 10{sup -} {sup 2} M, but when fluorofors are used this limit of detection increases in several orders of magnitude. In this work it has been used the arsenazo-III as fluorofor agent since it reacts in a specific way with the samarium, forming a complex that presents a proportional luminescence to the concentration of the present samarium. The advantage of making the quantification of samarium by luminescence is that it can use the same instrumental equipment to determine the speciation of the samarium sipped in the zircon. (Author)

  7. Separation and concentration of uranium by extraction chromatography : U(VI) - H3PO4 system

    International Nuclear Information System (INIS)

    The feasibility of using the extraction chromatographic technique as a way to recover uranium from phosphatic rocks evaluated. The behaviour of uranium from raw phsophoric acid solutions in chromatographic systems using the mixture di(2-ethylhexyl) orthophosphoric acid (D2EHPA) - tributyl phosphate (TBP) as the stationary phase was studied. Materials as alumina, activated carbon and the macroporous resins XAD-4 and XAD-7 were used as supports for organic stationary phase. The best results were obtained with poliacrilic polymer XAD-7, due to its excellent chromatographic properties and efficient organic phase retention. Uranium was quantitatively retained by D2EHPA-TBP-XAD-7 columns from synthetic phosphoric acid solutions with typical composition of phosphatic acid liquors. The elution of uranium from this system was also studied, and the best results were obtained with phosphoric acid solutions. This chromatographic column presented a high stability, not changing their properties even after more than twenty cycles, including the conditioning, sorption, wasking and elution steps. Uranium determinations were perfpormed by indirect titration with potassium dichromate and by molecular absorption spectrophotometry with hydrogen peroxide- carbonate. A new and more sensitive method for uranium determination in phosphoric medium, which might be applied to acid liquors of phosphatic ores, was developed. An extraction-photometric method was used, with Arsenazo III (1,8-dihydroxynaphtalene-3,6-disulphonic acid-2,7-bis(azo-2)-phenylarsonic acid) as the reagent for uranium. (Author)

  8. Study on the relationship between ultrasonographic diagnosis for different types of placenta praevia and outcome of pregnancy%超声诊断不同类型前置胎盘与妊娠结局的相关关系

    Institute of Scientific and Technical Information of China (English)

    陈融; 陆振林; 陈鸣

    2015-01-01

    Objective To explore the relationship between ultrasound diagnosis for different types of placenta previa and outcome of preg-nancy. Methods Fifty patients clinically diagnosed as placenta previa were detected by abdominal ultrasound and perineal ultrasound,and the coincidence rate of placenta previa diagnosed by ultrasound and surgical diagnosis was compared,and the relationship between different types of placenta previa and outcome of pregnancy had been analyzed. Results The coincidence rates of placenta praevia partialis,marginal placenta praevia and complete placenta praevia by abdominal ultrasound diagnosis and surgery confirmed diagnosis were 72. 22% ,78. 57% and 77. 78%respectively. The coincidence rates of placenta praevia partialis,marginal placenta praevia and complete placenta praevia in diagnosis of perineum ultrasound and surgery confirmed diagnosis were 88. 89% ,92. 86% and 100% respectively. The difference in accuracy of diagnosis of placenta previa between these 2 methods was statistically significant( P ﹤ 0. 05). Complete placenta previa with placenta conglutination in comparison with placenta praevia partialis and marginal placenta praevia,placenta increta,would increase the probability of postpartum hemorrhage and hyster-ectomy,and the differences was statistically significant( P ﹤ 0. 05). The occurrence of asphyxia in perinatal infant,premature birth rate and mor-tality in 3 perinatal stages of complete placenta previa group were higher than those with partialis or marginal placenta praevia groups,with lower Apgar scores,and the differences was statistically significant( P ﹤ 0. 05). Conclusion Perineal ultrasound diagnosis of placenta previa in com-parison with abdominal ultrasound has higher value,and it is suitable for the diagnosis of different types of placenta previa. Patients with complete placenta previa have poorer outcome of pregnancy,hence its prenatal care and health care should be strengthened.%目的:探讨超声诊断不

  9. [Predictors of extubation failure in neurosurgical patients].

    Science.gov (United States)

    León-Gutiérrez, Marco Antonio; Tanus-Hajj, Janet; Sánchez-Hurtado, Luis Alejandro

    2016-01-01

    Introducción: la información con respecto a los factores que afectan el éxito de la extubación en pacientes neuroquirúrgicos es limitada; por lo tanto, es necesario determinar los factores que inciden en esta condición. Métodos: estudio prospectivo, longitudinal, observacional y comparativo en pacientes neuroquirúrgicos con criterios para la extubación. En aquellos que presentaron fracaso se analizó el número de aspiraciones endotraqueales en las 24 horas previas a la extubación, la presencia del reflejo de tos, los días de estancia y de ventilación mecánica. Resultados: se incluyeron 70 pacientes en el estudio, de los cuales el 11.4 % presentó fracaso de la extubación y los factores asociados fueron la realización de 6 aspiraciones de secreciones endotraqueales 24 horas previas a la extubación (con una razón de riesgo [RR] = 1.88, intervalo de confianza [IC] al 95 % = 1.14-3.09, p 0.01), 7 días de ventilación mecánica (RR = 1.31, IC 95 % = 1.08-1.57, p 0.005) y 7.5 días de estancia (RR = 1.24, IC 95 % = 1.05-1.47, p 0.01). Conclusión: hacer seis o más aspiraciones de secreciones endotraqueales durante las 24 horas previas a la extubación es un factor de riesgo para el fracaso de la extubación de pacientes neuroquirúrgicos.

  10. Influencia del feedback específico y socioafectivo sobre la discriminación de género en las clases de educación física

    OpenAIRE

    Ramos Nateras, Fernando; Videra García, Antonio

    2011-01-01

    Investigaciones previas han demostrado la importancia del feedback en la enseñanza y su efecto sobre los estudiantes en las clases de educación física. El propósito de este estudio ha sido determinar la influencia del feedback socioafectivo y técnico en la discriminación de género percibida por el alumnado durante las clases de educación física. Ochenta y cuatro estudiantes de 5º de Educación Primaria fueron objeto de diferentes tratamientos de feedback durante 6 sesiones y ...

  11. La implicación de los departamentos en la evaluación y mejora de la actividad docente.

    OpenAIRE

    Carrillo Fernández, M.; Gil Fariña, M. C.

    2001-01-01

    La calidad en la enseñanza universitaria se ha convertido en un debate de actualidad en los últimos veinte años, en los que las sucesivas reformas planteadas en los planes de estudio no siempre han conseguido paliar las deficiencias de planes anteriores. Las dificultades de los estudiantes para elegir entre una amplia oferta de titulaciones, su trayectoria académica previa, la escasa motivación y la reforma impuesta en la enseñanza secundaria son, entre otros, algunos de los factores qu...

  12. Algunas consideraciones sobre la influencia de los estudios previos en las calificaciones de Matemáticas para los alumnos de la Diplomatura de Empresariales.

    OpenAIRE

    Asunción Zapata Reina; Inmaculada Masero Moreno; Dolores Gómez Domínguez; Patrocinio Fernández Geniz

    2000-01-01

    En este trabajo analizamos los resultados obtenidos por los alumnos de primer curso de la Diplomatura de Ciencias Empresariales de la Universidad de Sevilla, en la asignatura de Matemáticas, en el presente curso, teniendo en cuenta los estudios anteriores realizados. Intentamos determinar, a partir de los resultados obtenidos en el primer cuatrimestre, la influencia que tiene sobre éstos la formación matemática previa a la matriculación en este curso. La elección del primer cuatrimestre se h...

  13. La negociación colectiva antes del peronismo: el caso bonaerense (1935-1943)

    OpenAIRE

    Luciano Barandiarán

    2016-01-01

    Desde inicios de la década de 1970, se señaló la importancia de las experiencias sindicales previas a 1943 para comprender al peronismo. Retomando trabajos vinculados al estudio del movimiento obrero de entreguerras, este artículo aborda las características de la negociación colectiva en la provincia de Buenos Aires entre 1935 y 1943. El objetivo es analizar los espacios y los gremios afectados por esa experiencia, cuya relevancia no se circunscribió al gobierno de Manuel Fresco (1936-1940). ...

  14. Diseño de una estrategia didáctica para la enseñanza de la fisiología humana centrada en los efectos del consumo de alcohol, dirigida a estudiantes de básica secundaria

    OpenAIRE

    Báez Báez, Mónica Patricia

    2014-01-01

    Este documento muestra una propuesta para enseñar fisiología humana en el aula de clase, a partir de una realidad social, como lo es el consumo de alcohol. Por medio de módulos temáticos, se exponen los fundamentos teóricos de la fisiología humana y los efectos del alcohol en los principales órganos del cuerpo, para finalmente comprender los efectos perjudiciales del alcohol y prevenir su consumo. Cada módulo consta de un diagnóstico de ideas previas, una actividad introductori...

  15. Valor en riesgo (VeR): concepto, parámetros y utilidad

    OpenAIRE

    José Manuel Feria Domínguez; María Dolores Oliver Alfonso

    2006-01-01

    Hoy en día, el Valor en Riesgo (VeR) constituye una herramienta esencial en la medición y control del riesgo de mercado. Para asegurar una correcta interpretación de la cifra VeR por parte de usuarios potenciales (reguladores, accionistas, gestores de riesgo, etc.), es preciso la definición previa de una serie de parámetros como el nivel de confianza, el período de mantenimiento, la moneda de referencia y la metodología de estimación empleada. En este trabajo, nos centramos en el ...

  16. Ernesto Laclau: entre política y Estado: pervivencia del populismo

    Directory of Open Access Journals (Sweden)

    Roberto Follari

    2012-01-01

    Full Text Available Toda política contiene una dimensión agonística, por lo cual tiene un rasgo populista; pero es notorio que algunas políticas contienen fuertemente ese rasgo y otras no, por lo cual no toda política podría ser tildada de populista. A su vez, el populismo es deconstructor de las instituciones previas, pero requiere un mínimo de institucionalismo para formar parte del juego político; por ello, institucionalismo y populismo son pares opuestos de un continuo, que están en mutua tensión y referencia.

  17. Argentina, elecciones legislativas 2005: consolidación institucional del kirchnerismo y territorialización del voto

    OpenAIRE

    Ernesto Calvo

    2005-01-01

    Las elecciones legislativas del 2005 le han otorgado un fuerte respaldo a la gestión del presidente Néstor Kirchner, permitiéndole realinear políticamente al Partido Justicialista, exorcizar a la mayoría de sus competidores políticos dentro y fuera del partido, alcanzar un sólido control institucional del Congreso y posicionarse para una muy probable reelección en el 2007. Como ocurriera en las dos elecciones previas, sin embargo, una creciente fragmentación del voto opositor le ha otorgado a...

  18. Contenidos de isomeros trans de los acidos grasos en productos carnicos (I). Embutidos

    OpenAIRE

    Hernández, N.; Codony Salcedo, Rafael; Rafecas Martínez, Magdalena; Boatella Riera, Josep

    1991-01-01

    En este trabajo se determinan los contenidos de isómeros trans de la fracción de los ácidos grasos, en muestras de embutidos diversos (total 48 muestras), mediante extracción previa de la fracción grasa y posterior análisis por cromatografía de gases capilar, con columna CP Sil 88. Los resultados muestran una gran variabilidad, entre 0,14 y 1,63% de C18:1 t y entre 0,37 y 2,14% de formas trans totales.

  19. Preparación automática de alimentos para la determinación de aditivos por cromatografía

    OpenAIRE

    González González, Mónica

    2003-01-01

    El objetivo de esta tesis se centró en la automatización y simplificación de las operaciones previas del proceso analítico para la determinación de aditivos en alimentos. La simplificación y automatización alcanzados con los métodos desarrollados permitió conseguir ventajas sustanciales respecto a las metodologías convencionales, en términos de calidad informativa y de mínimos esfuerzos, costes y riesgos para el operador y el medio ambiente. Se desarrollaron tres métodos para la determinación...

  20. Interfaz Totad: nuevos métodos de análisis de aceites y mejoras para el ahorro de gases.

    OpenAIRE

    Aragón Serrano, Álvaro

    2014-01-01

    El análisis de muestras complejas requiere de métodos robustos de separación y procedimientos fiables de cuantificación de los analitos a determinar. Habitualmente el análisis de este tipo de muestras necesita de etapas previas de preparación, generalmente extracción-concentración y limpieza, que presentan muchos inconvenientes. Una solución a estos problemas es el empleo de técnicas acopladas como son el acoplamiento directo de cromatografía de líquidos y cromatografía de gases (LC-GC) y ...

  1. Los efectos de la comunicación comercial sobre el Valor de Marca de bienes duraderos.

    OpenAIRE

    Villarejo Ramos, Ángel Francisco; Sánchez Franco, Manuel Jesús

    2004-01-01

    En el presente trabajo pretendemos establecer, a partir de una revisión teórica previa, una base empírica para la consideración de la influencia de la comunicación comercial como esfuerzo de marketing en la determinación del valor de marca del producto. Tras la revisión teórica que sustenta la aplicación de modelos de ecuaciones estructurales, planteamos la confirmación empírica de las relaciones existentes entre el esfuerzo en comunicación comercial...

  2. Reacciones químicas y representaciones sociales de los estudiantes

    OpenAIRE

    Meneses Villagrá, Jesús Ángel; Lacolla, Liliana; Valeiras, Nora

    2014-01-01

    La presente investigación incorpora el concepto de representaciones sociales al estudio de las ideas de sentido común que poseen los estudiantes acerca de las reacciones químicas. Se determina la estructura de esta representación social en alumnos de 16 años de manera previa al tratamiento escolar del tema. Se analizan las modificaciones que ha sufrido la representación social inicial, después de la enseñanza que ha sido llevada a cabo mediante una secuencia didáctica organizada para tal fin....

  3. Las motivaciones empresariales de los inmigrantes argentinos en España

    OpenAIRE

    Baltar, Fabiola; Brunet Icart, Ignasi

    2011-01-01

    El objetivo de este trabajo es analizar si los empresarios inmigrantes de países en desarrollo responden al estereotipo de empresario por "necesidad" definido en las estadísticas internacionales de los países desarrollados. Para ello se realizaron 214 encuestas a empresarios argentinos radicados en España indagando en la motivación para crear una empresa, la experiencia laboral previa a emigrar y el tipo de emprendimiento que realizan. Los resultados muestran que existe una gran heterogeneida...

  4. Estudio cualitativo y voltamperométrico de comprimidos de albendazol

    OpenAIRE

    Chahín, Cecilia Lorena

    2013-01-01

    El albendazol es un antiparasitario que integra la lista de medicamentos esenciales de la OMS perteneciente al grupo de los bencimidazoles, se comercializa para el tratamiento en personas como Zentel. En el trabajo se estudia la determinación del albendazol por técnicas voltamperométricas, aplicando la voltamperometría dilferencial de impulsos para la determinación cuantitativa de comprimidos, previa preparación de líneas de calilbrado a partir del principio activo. Se utilizan procedimientos...

  5. Capítulo III. El territorio indígena bajo el régimen virreinal

    OpenAIRE

    Ariel De Vidas, Anath

    2013-01-01

    “... los indios naturales [de Panuco]... despueblan sus pueblos y casas y se [van] a los montes y [...] ninguno [tiene] participación con su mujer, por no hacer generación que a sus ojos hagan esclavos y se los lleven fuera de su naturaleza...” (Fray Juan de Zumárraga, 1529) Antes de abordar el tema de las tierras y de las comunidades indígenas en la Huasteca durante el período virreinal, es necesario aportar algunas acotaciones previas sobre los eventos que precedieron a la instauración del ...

  6. Desviación disociada. Estrabismo de origen cortical

    OpenAIRE

    Martín Gallegos-Duarte; Jorge Mendiola-Santibáñez; Juan José Ortiz-Retana; Bernardo Rubín de Celis-Monteverde; Rosana Vidal-Pineda; Arleth Sigala-Zamora

    2007-01-01

    Objetivos: Determinar las alteraciones corticales relacionadas con el origen de la desviación disociada. Material y métodos: Estudio prospectivo, descriptivo y observacional que incluyó a 10 niños con diagnóstico de desviación horizontal disociada, sin evidencia previa de daño neuronal. Se determinó la dominancia manual, cerebral y ocular, el estado sensorial y el perfil perceptual visual. Se analizó la respuesta cortical a diferentes estímulos: luminoso, hiperventilación, movimientos de segu...

  7. Anexo: ejemplos de interrelaciones de TADs

    OpenAIRE

    Blasco Planesas, Jordi

    2012-01-01

    El actual documento tiene como objetivo mostrar una serie de ejemplos de interrelaciones de TADs. No se pretende entrar en profundidad en la toma de decisiones previa a cualquier elección de TADs, sino que en base a un escenario concreto, se quiere exponer de una forma práctica algunas relaciones que se pueden establecer entre TADs, usando la biblioteca de TADs como elemento de soporte para construir las nuevas estructuras. Aquest document té com a objectiu mostrar una sèrie d'exemples d'i...

  8. La mediación familiar obligatoria: una crítica a la regulación y funcionamiento en Chile Alejandro Paredes Zieballe

    Directory of Open Access Journals (Sweden)

    Alejandro Paredes Zieballe

    2012-12-01

    Full Text Available Como una forma de descongestionar los tribunales de familia, la Ley 20.286 establece en Chile, entre otras medidas, la mediación obligatoria previa a la interposición de la demanda en determinadas materias de familia. Esta investigación contempla un estudio de la mediación como una forma alternativa de resolución de conflictos en derecho de familia desde diversas perspectivas y pretende efectuar un análisis crítico del mecanismo de mediación obligatoria en nuestra legislación.

  9. Cambios hormonales asociados al embarazo: Afectación gingivo-periodontal Hormonal changes associated to pregnancy: Gingivo-periodontal involving

    OpenAIRE

    E. Figuero-Ruiz; I. Prieto Prieto; BASCONES-MARTÍNEZ, A.

    2006-01-01

    La gingivitis gravídica es una inflamación proliferativa, vascular e inespecífica con un amplio infiltrado inflamatorio celular. Clínicamente se caracteriza por una encía intensamente enrojecida que sangra fácilmente, por un engrosamiento del margen gingival y por hiperplasia de las papilas interdentales que pueden dar lugar a la aparición de pseudobolsas. La prevalencia varía entre el 35 y el 100% de las embarazadas con gingivitis previa. Aunque parece que durante el embarazo la susceptibili...

  10. Razonamiento en la transición de las estrategias manipulativas a la generalización

    OpenAIRE

    Cañadas, María C.; Figueiras, Lourdes

    2009-01-01

    Describimos el proceso seguido por estudiantes de 11-12 años para descubrir patrones de conteo en un problema básico de combinatoria. Hacemos énfasis en la transición de estrategias manipulativas para el conteo directo a la generalización. En esta transición aparecen, de forma espontánea, diagramas de árbol y algunos estudiantes recurren a estrategias comunes en pensamiento numérico. Resaltamos el interés de resolver problemas de combinatoria sin haber aprendido fórmulas previas para que los ...

  11. Un módulo de enseñanza centrado en desarrollar el conocimiento necesario para enseñar el razonamiento proporcional

    OpenAIRE

    Fernández Verdú, Ceneida; Buforn Lloret, Ángela

    2015-01-01

    La idea del Conocimiento de Matemáticas para Enseñar (MKT) implica la relación entre el conocimiento de matemáticas y el conocimiento de contenido pedagógico. Investigaciones previas han identificado diferentes dominios en el conocimiento de matemáticas para enseñar: conocimiento del contenido matemático que es el conocimiento de matemáticas que permite a los profesores implicarse en tareas específicas de la enseñanza, conocimiento del contenido pedagógico que está centrado en cuestiones de a...

  12. Estudio de la Enseñanza Postgraduada Pública de Cirugía Bucal en España

    OpenAIRE

    Rodríguez Pérez, M.; Romero Olid, María Nuria; Vallecillo Capilla, Manuel Francisco

    2005-01-01

    El objetivo de este estudio de investigación es dar a conocer el tipo de enseñanza postgraduada pública en Cirugía Bucal que se está impartiendo actualmente en España, realizando un estudio descriptivo con relación a los contenidos teóricos y prácticos de los diferentes Máster, mediante encuestas contestadas por alumnos que han concluido el postgrado. Posteriormente se observa la posible relación existente con la edad, sexo y formación previa como odontólogo o estomatólogo. Los resultados mue...

  13. El uso de imágenes Ikonos para la cartografía de riesgo de inundación en pequeñas cuencas mediterráneas

    OpenAIRE

    López García, María José; Carmona, P.; Ruiz, J. M.; Camarasa Belmonte, Ana María

    2006-01-01

    La confección de una cartografía efectiva de riesgo de inundación precisa de la elaboración previa de mapas de peligro, que recojan las zonas sometidas a los procesos naturales asociados a la crecida. Para la configuración de estos mapas resulta muy útil el estudio de las áreas afectadas en sucesos concretos. En esta tarea el uso de la teledetección se ha demostrado altamente eficaz para el caso de grandes cuencas, afectadas por procesos de inundación extensivos y llanuras bien definidas. Sin...

  14. Programa de prevenção do HIV/SIDA para estudantes universitários: um estudo piloto

    OpenAIRE

    Maria Alvarez; Michael Oliveira

    2007-01-01

    Queríamos aumentar las competencias conductuales y desarrollar la adopción de comportamientos preventivos hacía el VIH/SIDA, y no sólo el uso continuado del preservativo, principalmente la realización de la prueba de detección del VIH/SIDA en las parejas. Se ha tratado de un estudio quasiexperimental (N = 7, estudiantes universitarias), con 6 sesiones semanales de 3 horas cada una, envolviendo un grupo de control sujeto a otras intervenciones y una evaluación previa y posterior...

  15. Eliminación de Enterococcus faecalis por medio del uso de hipoclorito de sodio, clorhexidina y MTAD en conductos radiculares

    OpenAIRE

    S. Pupo Marrugo; A. Díaz Caballero; P. Castellanos Berrio; V. Simancas Escorcia

    2014-01-01

    Objetivos: Comparar la efectividad de diferentes soluciones irrigadoras en la eliminación de cepas de Enterococcus faecalis en pacientes con patología periapical crónica, mediante pruebas microbiológicas. Métodos: Se evaluaron 21 dientes con diagnóstico de periodontitis apicales crónicas no supurativas de pacientes que asistieron a consulta en las clínicas odontológicas de la Universidad de Cartagena, previa firma y aprobación del consentimiento informado para participar en el estudio. Los su...

  16. Diseño de un instrumento para evaluación diagnóstica de la competencia digital docente : formación flipped classroom

    OpenAIRE

    Martín Rodríguez, Déborah; Sáenz de Jubera, Mª Magdalena; Campión, Raúl Santiago; Edurne CHOCARRO DE LUIS

    2016-01-01

    La propuesta que se presenta a continuación consiste en el diseño y construcción de un instrumento para la evaluación diagnóstica de las competencias digitales docentes previa a una formación Flipped Classroom. El instrumento que proponemos consiste en un cuestionario diseñado conforme a las dimensiones recomendado del “Marco Común de Competencia Digital Docente” del Plan de Cultura Digital en la Escuela y las especificidades que requiere el modelo flipped learning, con el fin de que el profe...

  17. Diagnostic accuracy of the ultrasonography in complicated pregnancy

    Energy Technology Data Exchange (ETDEWEB)

    Cha, Kyung Soo; Kim, Kun Sang; Park, Soo Soung [Chungang University College of Medicine, Seoul (Korea, Republic of)

    1983-12-15

    Ultrasonography is an invaluable diagnostic method in Obstetrics. It provides safe, speedy and repeatable way to obtain image of normal and abnormal pregnancy. The ultrasonograms of 167 patients with suspicion of complicated pregnancy were analyzed. The results were as follows. 1. 86 patients showed normal ultrasonogram(50.9%). 100% in intrauterine fetal death and gross fetal anomaly, 100% in abnormal fetal position and number, 95% in pregnancy with pelvic mass, 83% in ectopic pregnancy, 81% in abortion, 78% in molar pregnancy, 74% in plancenta previa. 3. Ultrasonic diagnosis of abrupto placenta was difficult. 4. Diagnostic accuracy was 80% in bicornuate uterus and double vagina

  18. Smoking among pregnant women - epidemiology and health consequences

    Directory of Open Access Journals (Sweden)

    Kjell Haug

    2009-10-01

    Full Text Available  ABSTRACTSmoking during pregnancy is an important, preventable risk factor for late fetal death and even SIDS.There is a strong dose-response relationship between cigarette smoking and spontaneous abortion,reduction in birth weight, abruptio placentae, placenta previa and bleeding during pregnancy. Ten yearsago, the prevalence of smoking among Norwegian pregnant women was between 35 and 40%. Duringthe last 8 years there has been a dramatic change and in 1995 the prevalence seems to be around 20%.

  19. [Perioperative management of abdominal aortic balloon occlusion in patients complicated with placenta percteta: a case report].

    Science.gov (United States)

    Zeng, Hong; Wang, Yan; Wang, Yang; Guo, Xiang-yang

    2015-12-18

    When placenta previa complicated with placenta percreta, the exposure of operative field is difficult and the routine methods are difficult to effectively control the bleeding, even causing life-threatening results. A 31-year-old woman, who had been diagnosed with a complete type of placenta previa and placenta percreta with bladder invasion at 34 weeks gestation. Her ultrasound results showed a complete type of placenta previa and there was a loss of the decidual interface between the placenta and the myometrium on the lower part of the uterus, suggestive of placenta increta. For further evaluation of the placenta, pelvis magnetic resonance imaging was performed, which revealed findings suspicious of a placenta percreta. She underwent elective cecarean section at 36 weeks of gestation. Firstly, two ureteral stents were placed into the bilateral ureter through the cystoscope. After the infrarenal abdominal aorta catheter was inserted via the femoral artery (9 F sheath ), subarachnoid anesthesia had been established. A healthy 2 510 g infant was delivered, with Apgar scores of 10 at 1 min and 10 at 5 min. Immediately after the baby was delivered, following which there was massive haemorrhage and general anaesthesia was induced. The balloon catheter was immediately inflated until the wave of dorsal artery disappeared. With the placenta retained within the uterus, a total hysterectomy was performed. The occluding time was 30 min. The intraoperative blood loss was 2 500 mL. The occluding balloon was deflated at the end of the operation. The patient had stable vital signs and normal laboratory findings during the recovery period and the hemoglobin was 116 g/L. She was discharged six days after delivery without intervention-related complications. This case illustrates that temporary occlusion of the infrarenal abdominal aorta using balloon might be a safe and effective treatment option for patients with placenta previa complicated with placenta percreta, who were at high

  20. Placenta Percreta With Invasion into the Urinary Bladder

    Directory of Open Access Journals (Sweden)

    Zachary L. Smith

    2014-01-01

    Full Text Available Placenta percreta is a rare condition, which can lead to significant morbidity and potentially mortality. We present a case of a 38-year-old woman who presented at 24 weeks gestation with vaginal bleeding and was found to have complete placenta previa with placenta percreta invading the urinary bladder. Her hospital course was complicated by bilateral pulmonary emboli. She underwent an exploratory laparotomy, repeat Caesarean section, and total abdominal hysterectomy. Because of placental invasion into the bladder, the procedure was complicated by bladder and ureteral injuries for which urology carried out repair. Postoperatively, the patient had a persistent bladder leak until postoperative day #39.

  1. INTERNAL ILIAC ARTERY LIGATION AFTER CAESERIAN HYSTERECTOMY IN POST - PARTUM HAEMORRHAGE LIFE SAVING PROCEDURE

    Directory of Open Access Journals (Sweden)

    Vijayalakshmi

    2015-07-01

    Full Text Available Internal iliac artery (Hypogastric supplies the pelvic viscera. Bilateral ligation of the internal iliac arteries is a safe, rapid and very effective method of controlling bleeding from genital tract. It is also helpful in massive broad ligament hematoma, in torn vessels retracted within th e broad ligament, and even in postoperative hemorrhage after abdominal or vaginal hysterectomy where there are no definitive bleeding points detectable. Bilateral ligation of internal iliac arteries is also helpful in life threatening hemorrhagic condition s like postpartum hemorrhage, placenta previa, cervical and vaginal tear, cervical pregnancy and uterine rupture etc.

  2. Espondilitis tuberculosa no es una metástasis vertebral: diagnóstico diferencial y tratamiento quirúrgico. A propósito de un caso

    OpenAIRE

    Pérez Vergara, S.; Moreno García, I.; Garcés Hernández, M.; Bas Hermida, T.; Bas Hermida, P.

    2011-01-01

    Presentamos el caso de una paciente con dorsalgia y clínica neurológica de varios meses de evolución que ante las pruebas de imagen fue erróneamente diagnosticada de metástasis vertebral sin confirmación previa con biopsia. El deterioro progresivo neurológico y las nuevas pruebas de imagen confirmaron el diagnóstico de tuberculosis vertebral. La paciente fue tratada mediante curetaje, desbridamiento, fusión intersomática y osteosíntesis anterior además del tratamiento médico. Hubo...

  3. Recursos de osteosíntesis en fémur porótico.

    OpenAIRE

    Torner i Pifarré, Pere; Gallart Castany, Francisco Javier; Sastre, S.; García, S.; Segur Vilalta, Josep M.; Riba i Ferret, Josep; Suso Vergara, Santiago

    2004-01-01

    Objetivos. Exponer dos técnicas quirúrgicas de refuerzo de una osteosíntesis convencional en situaciones especiales de debilidad ósea del fémur, como son las fracturas periprotésicas, las fracturas patológicas y los fracasos de osteosíntesis previas en pacientes de edad avanzada. La debilidad del hueso puede llegar a dificultar la realización de osteosíntesis estables en fracturas de fémur porque impide el correcto anclaje del material, ya sean agujas, cerclajes o especialmente tornillos. Mat...

  4. Tratamiento funcional versus osteosíntesis diferida de las fracturas complejas de la diáfisis femoral (estudio multicéntrico)

    OpenAIRE

    Cáceres Palou, Enrique; Fernández Sabaté, Alfons; Ubierna, M. T.; Cabo Cabo, Xavier; Robres Ruiz, L.

    1989-01-01

    El aumento de la frecuencia de fracturas de la diáfisis del fémur de tipo complejo ha puesto de relieve técnicas que permiten consolidar estas fracturas y mantener simultáneamente una alineación y longitud correctas. La mayoría de ellas se caracterizan por una sofisticada consecución y multitud de complicaciones. Nuestra experiencia previa con un método incruento (TF) y otro quirúrgico (OD) nos ha permitido realizar un estudio comparativo. Los resultados han sido favorables en ambas series La...

  5. TENDENCIA Y PERSPECTIVA DE LA ECONOMÍA GLOBAL Y SU IMPACTO EN LA ECONOMÍA MEXICANA

    OpenAIRE

    Gerardo Ángeles Castro

    2012-01-01

    En este estudio se demuestra que la crisis económica global de 2008-2009 no ha sido superada, y aunque México cuenta con bajos niveles de deuda pública y ha retomado las tasas de crecimiento previas a la debacle económica, su crecimiento económico sigue siendo bajo, influenciado principalmente por la desaceleración de sus exportaciones, lo cual a su vez, es el resultado de la desaceleración económica global. Ante esta situación es importante diversificar los productos domésticos y mejorar su ...

  6. Tendencias jurisprudenciales en Derecho Informático. Período 2000 a 2005

    Directory of Open Access Journals (Sweden)

    María José Viega

    2014-06-01

    Full Text Available Cuando nos planteamos la realización del presente trabajo en el Grupo de Jurisprudencia del Instituto de Derecho Informático, tomamos como período de investigaciónel comprendido entre los años 2000 a 2005. Sin embargo, parece oportuno, realizar en forma previa un encuadre evolutivo de la jurisprudencia en nuestro país.Contenido: Introducción. Jurisprudencia civil. Jurisprudencia laboral. Jurisprudencia contencioso administrativa. Jurisprudencia en materia penal

  7. La innovación abierta en Starbucks Corporation

    OpenAIRE

    Martínez Torres, María del Rocío; Rufo Castañeda, Irene

    2013-01-01

    El acortamiento del ciclo de vida de los productos y la presencia activa del consumidor en fases previas a su comercialización ha supuesto un cambio en la visión empresarial. Asimismo, la generalización de las TIC supone el principal factor evolutivo del análisis de la información. Haciendo uso de estas nuevas tecnologías surge la innovación abierta u open innovation, que es una forma de externalizar el proceso de innovación de una empresa. Dicho proceso se basa en involucrar a...

  8. Acondicionamiento de cavidades terapéuticas

    OpenAIRE

    Berástegui, Esther; Pumarola Suñé, José; Roig Cayón, Miguel

    1997-01-01

    La aparición de materiales nuevos obliga a replantearse la preparación del sustrato dental para recibir el material de obturaión. El objetivo de estudio fue analizar la situación actual en lo referente al acondicionamiento de cavidades en operatoria dental previa a la obturación. Para ello se ha revisado la literatura más moderna en tres aspectos: la tinción de la caries, desinfección y la protección del complejo pulpodentinario. Después del estudio del tema llegamos a la conclusión que la de...

  9. Apego percibido y conducta prosocial en adolescentes

    OpenAIRE

    Cinthia Balabanian; Viviana Lemos; Jael Vargas Rubilar

    2015-01-01

    Teniendo en cuenta el rol fundamental del apego parental en el desarrollo de diferentes recursos socio-emocionales, el objetivo de este trabajo fue estudiar si la percepción del apego parental se relaciona específicamente con la conducta prosocial adolescente. Método: se trabajó con una muestra no probabilística inten-cional de 285 adolescentes (216 mujeres y 69 varones) de entre 14 y 18 años (M = 15,68; DE = 1,14), de Córdoba, Argentina. Previa autorización de los padres y consentimiento inf...

  10. Extensiones de PMML para el preproceso de datos en proyectos de data mining

    OpenAIRE

    Beato Castro, Lisibonny

    2008-01-01

    Desde hace algunos años CRISP-DM se ha establecido como el modelo de procesos por excelencia para el planeamiento y la ejecución de proyectos de Data Mining, describiendo las tareas más comúnmente utilizadas por los expertos en Data Mining para atacar los problemas. Una de las fases de este es la de Data Understanding que busca que el analista se familiarice con el dato, obtenga impresiones iniciales de su estado e identifique problemas de calidad del mismo previas a su preparación y posterio...

  11. Leptina. Estudio sobre el estrés oxidativo y la vía de señalización celular en monocitos de pacientes VIH positivos

    OpenAIRE

    Sánchez Pozo, María Cristina

    2006-01-01

    El descubrimiento de la leptina ha arrojado luz en la compleja biología del tejido adiposo. En contra de la visión previa y simplista que se tenía del tejido adiposo como mero reservorio de triglicéridos, ahora sabemos que está compuesto por células especializadas en almacenar grasa, los adipocitos, y, que como las células vasculares y del sistema inmune, median diversos procesos fisiológicos (Friedman, 2000; Fruhbeck et al., 2001) El tejido adiposo secreta leptina, adiponectina, resistina, c...

  12. Formación presencial y virtual : influencia en una propuesta de educación sexual para alumnado prioritario

    OpenAIRE

    García Rojas, Antonio Daniel

    2016-01-01

    El objetivo central de esta tesis doctoral es evaluar el grado de conocimientos, actitudes y conductas de la población universitaria sobre la dimensión sexual, previa a la implementación de dos actividades formativas y posterior a la misma, en tres momentos diferenciados. El programa formativo fue diseñado en con una modalidad presencial y otra virtual e implementado en un mismo período de tiempo, incluyéndose dentro del Catálogo de Libre Configuración de la Universidad de Huelva del curso...

  13. Estudio comparativo del dolor entre arcos de acero y níquel titanio en los tratamientos de ortodoncia

    OpenAIRE

    Larrea Elena, Mónica

    2013-01-01

    Introducción El dolor ha sido tradicionalmente uno de los efectos secundarios más frecuentes en los tratamientos de ortodoncia. El movimiento ortodóncico produce una reacción inflamatoria en el periodonto y la pulpa, lo que estimula la producción de mediadores bioquímicos causantes de la sensación de dolor. (Krishnan y cols, 2007) Existen diferentes factores como el sexo, personalidad y su experiencia previa con otros tratamientos dentales, que pueden influir en la vivencia concreta qu...

  14. La cirugía periapical de los molares

    OpenAIRE

    Gay Escoda, Cosme; Paredes García, Jordi; Berini Aytés, Leonardo

    1993-01-01

    Se han estudiado 65 pacientes sometidos a intervención quirúrgica periapical en 72 molares ( 120 raíces y 155 conductos radiculares). Se analizó una serie de características preoperatorias (edad, antecedentes patológicos, patologías asociadas, distribución de dientes afectados, tamaño de la lesión periapical, tipo de endodoncia ortógrafa y calidad radiológica de la endodoncia previa), peroperatorias (tipo de incisión, existencia de comunicación oroantral, afectación cortical, tamaño de la res...

  15. IMPACTOS DEL FITOMEJORAMIENTO PARTICIPATIVO CUBANO

    OpenAIRE

    Ortiz, R.; H. Ríos; M. Ponce; Gil, V.; O. Chaveco; R. J. Valdés

    2007-01-01

    Como resultado de investigaciones previas y de la fase de diagnóstico del proyecto "Fitomejoramiento participativo (FP) como estrategia complementaria en Cuba", se encontró en las áreas de intervención que más del 85 % de los agricultores no utilizaban la semilla del sistema formal y, por tanto, las variedades obtenidas por los diversos programas de mejora no llegaban a la mayoría de los agricultores. Esta aseveración se ha seguido confirmando en otras localidades y sistemas productivos. En t...

  16. Valores de referencia españoles para la versión reducida de la Escala de Autoeficacia para la Lactancia Materna BSES-SF

    OpenAIRE

    Marco Alegría, T.D.; Martínez Martínez, D.; M.J. Muñoz Gómez; Sayas Ortiz, I.; A. Oliver-Roig; M. Richart-Martínez

    2014-01-01

    Fundamento: Describir los valores de referencia para la versión española de la Escala de Autoeficacia para la Lactancia Materna en su versión reducida (BSES-SF), considerando las diferencias según la experiencia previa en lactancia y la paridad. Metodología: Estudio transversal realizado en cinco hospitales de Alicante y uno de la Región de Murcia, con una muestra accidental de 949 mujeres que ofrecieron lactancia materna en el posparto, sin problemas médicos, propios o del recién nacido, que...

  17. El modelo social de la Comunidad: criterios y línea de competencia

    OpenAIRE

    Orduña Moreno, Francisco Javier

    2007-01-01

    La referencia inicial al Modelo Social de la Comunitat Valenciana en el marco normativo de la reforma de la Ley Orgánica 1/2006 de 10 de abril, plantea dos cuestiones previas de índole conceptual estrechamente relacionadas entre sí; a saber, la precisión de su significado en relación a aquellos principios y directrices que informan la organización jurídica de la materia de servicios sociales, y la delimitación de su autonomía o especificidad en el sistema constitucional español de protecci...

  18. Estudios de eficiencia en el uso de la luz y estimaciones de biomasa en cultivos energéticos de Salix sp. en Central New York, USA

    OpenAIRE

    Latorre Monteagudo, Bernardo

    2012-01-01

    La productividad es un factor importante que influye en la viabilidad económica de un cultivo energético de sauce y maximizarla se convierte en un tema primordial. Esta investigación está directamente relacionada con dicha característica. La productividad varía según los clones cultivados, que pueden ser mejorados y seleccionados genéticamente. Los programas genéticos requieren de una información previa (productividad media en función del porte y número de los tallos, características de las h...

  19. Fases en la tematización del esquema de la derivada: comprensión en alumnos universitarios

    OpenAIRE

    Fuentealba, C; E. Badillo; Sánchez-Matamoros García, Gloria

    2015-01-01

    El estudio que presentamos es parte de una investigación más extensa que aborda la comprensión del concepto de derivada en estudiantes universitarios con instrucción previa en cálculo diferencial. En particular, nos centramos en el análisis de la tematización del esquema de la derivada. Para ello se utilizan los niveles de comprensión de un esquema intra-inter-trans (propuestos por Piaget y García) ajustados al concepto de derivada en términos de elementos matemáticos, relaciones lógicas y mo...

  20. Bodega de crianza y residencia taller. PFC 2008

    OpenAIRE

    Ruiz Taroncher, Aida

    2011-01-01

    Llegar hasta el Rebollar implica multitud de caminos serpenteantes, de ahí la importancia del recorrido dentro de la intervención. Aprender a escuchar el murmullo, el rumor del lugar, es una experiencia necesaria y previa a cualquier línea. Necesitaba conseguir un argumento proyectual que hiciera posible que fuera el propio lugar el que suministrara las pautas de la intervención. La arquitectura se ha convertido en la forma de materializar un instinto fruto de la reflexión. Este d...

  1. Prefabricación en rehabilitación: el panel de madera contralaminada en el edificio de Ca la Dona

    OpenAIRE

    Bestraten Castells, Sandra Cinta; Hormias Laperal, Emilio

    2011-01-01

    1er. Premio TAFIBRA para la mejor comunicación en CIMADI11 (NitUPC 2012) En la rehabilitación del edificio histórico de la C/Ripoll nº25 de Barcelona para su adaptación a uso público se ha realizado una apuesta estructural innovadora realizando una substitución funcional de los forjados con paneles de madera contralaminada y conservando los forjados existentes validados por la diagnosis previa. Los forjados con paneles de madera contralaminada resuelven de forma respetuosa el comportami...

  2. Sostenibilidad aplicada en el Tercer Mundo. Burkina Faso

    OpenAIRE

    Gómez Gómez, Laura

    2013-01-01

    El presente proyecto se divide en dos partes bien diferenciadas. En la primera parte se trata la sostenibilidad desde tres puntos de vista: arquitectónica (en la que se hace mayor hincapié en el proyecto), social y económica. Para su elaboración, ha sido imprescindible una investigación previa de diversos conceptos arquitectónicos, tales como: - Arquitectura ecológica: Trata de planificar, de forma anterior a la construcción, los procedimientos que se llevarán a cabo durante su...

  3. Uso de colifagos somáticos como indicadores de contaminación fecal en playas de “la Costa Verde”, Lima–Perú

    OpenAIRE

    Hinsby Cadillo Quiroz; Jorge León Quispe

    2014-01-01

    El presente estudio fue realizado con el objetivo de evaluar el uso de los colifagos somáticos como indicadores de contaminación fecal en aguas recreacionales marinas. Los colifagos somáticos fueron cuantificados en 140 muestras provenientes de 5 playas del circuito de la “Costa Verde”, Lima, y correlacionados con los indicadores de contaminación fecal convencionales (Coliformes fecales, E. coli y Enterococos). Los colifagos fueron determinados por el método de “capa simple” previa aplicaci...

  4. Videojuegos en aula: una herramienta de evaluación educativa

    OpenAIRE

    Esnaola, Graciela; Yuste, Rocío; Ansó, María Beatriz de; Borrero, Raquel

    2011-01-01

    Los videojuegos han entrado a las vidas de los jóvenes y a las aulas. De allí nuestro interés por desarrollar un instrumento de evaluación educativa con el objetivo de promover la reflexión en el alumnado de escuelas medias sobre los aprendizajes implícitos en los diferentes videojuegos a los que acceden diariamente. El diseño de evaluación que presentamos es fruto de una investigación previa realizada por psicopedagogos, radicada en la Universidad Nacional de Tres de Febrero con el objetivo ...

  5. Programa de habilidades Sociales con Personas Mayores

    OpenAIRE

    López García, Judith

    2013-01-01

    Este proyecto refleja la necesidad del entrenamiento en habilidades sociales teniendo como destinatarios a un colectivo de personas mayores, con el que se realizará una propuesta práctica del proceso psicopedagógico tras una fase previa de evaluación y diagnóstico de las necesidades del colectivo; durante la fase del programa de intervención propiamente dicho, se llevarán a cabo sesiones que ayudarán a mejorar la autoestima, el control de la ira, la comunicación para establecer unas óptimas r...

  6. Análisis de la Estrategia de Internacionalización: Estudio del Grupo Cortefiel.

    OpenAIRE

    Ibáñez García, Almudena

    2015-01-01

    Se ha escogido el “Grupo Cortefiel” por tratarse de una empresa pionera en nuestro país en la internacionalización y por su consideración como una de las principales compañías europeas de distribución de moda en el segmento de cadenas especializadas. Para llegar a este fin, algunas de las metas previas que nos hemos planteado han sido las siguientes:  Entender el concepto de estrategia y sus tipos sobre todo la corporativa, que es donde situaremos la estrategia de intern...

  7. Mujer en la publicidad televisiva franquista de los años 60: caso Soberano

    Directory of Open Access Journals (Sweden)

    Patricia Pujante Crespo

    2015-07-01

    Full Text Available El presente artículo da cuenta de una investigación previa que analiza el papel atribuido a la mujer española en la década de 1960 en la publicidad televisiva. Lo que se pretende es demostrar la influencia de la dictadura franquista en los medios de comunicación y en la publicidad, utilizándolos como estrategia propagandística del régimen y convirtiéndolos en un reflejo de la sociedad.

  8. Empleo de la Geometría Dinámica como apoyo en actividades de lápiz y papel, para la comprensión de los tópicos de razón y proporción

    OpenAIRE

    Ruiz, Elena Fabiola; Lupiáñez, José Luis

    2010-01-01

    Introducción. El presente artículo plantea la importancia de la conjunción de actividades de lápiz y papel y el uso de la tecnología con la finalidad de que los estudiantes complementen su aprendizaje de razón y proporción. Se toma como antecedente una experiencia previa sobre el uso de estrategias al resolver problemas de razón y proporción. Como respuesta al reconocimiento de los componentes cognitivos de los estudiantes se decidió tener un apoyo mediante la observación y manipulación de re...

  9. Estudio de un pelambre reductor-oxidante

    OpenAIRE

    Gavilanes Tutiven, Rosa Maria

    2011-01-01

    El objectivo principal del proyecto consiste, por una parte en reducir la cantidad de productos utilizados en el pelambre clásico y por otro lado reducir la contaminación de las aguas residuales, realizando una combinación del pelambre reductor con sulfuro y el pelambre oxidante con peróxido de hidrógeno. Para conseguir este objectivo se han realizado una serie de pruebas previas y experimentales, para intentar saber la cantidad exacta de peróxido de hidrógeno utilizado en el pelambre reducto...

  10. Comentarios sobre las posibilidades de un nuevo programa macroeconómico entre Honduras y el Fondo Monetario Internacional

    OpenAIRE

    Sebastian Katz

    2008-01-01

    El presente informe analiza de manera sucinta las ponencias efectuadas tanto por las autoridades del gobierno de Honduras como por el representante del Fondo Monetario Internacional (FMI) en la reunión mantenida por ambas partes el 24 de abril de 2007 en Tegucigalpa. En la exposición se han tomado en cuenta, asimismo, las conversaciones previas mantenidas por el consultor con las autoridades del gobierno en la misión de apoyo realizada en los últimos días de febrero de 2007, así como algunos ...

  11. Encuesta sobre el servidor de bases de datos del CSIC

    OpenAIRE

    Baranda, Piedad

    2002-01-01

    El servidor de bases de datos del CSIC está formado por cerca de 40 bases de datos de todas las disciplinas científicas que las bibliotecas de los diferentes centros de investigación venían suscribiendo desde hacía años para la consulta de sus investigadores. La organización del servidor no es pues, el resultado de una selección rigurosa previa atendiendo a las demandas y necesidades de los potenciales usuarios interesados.

  12. Limitaciones de la tomografia axial computada en la localizacion de quistes hidatidicos abdominales en pacientes con confirmacion inmunodiagnostica

    OpenAIRE

    Guarnera, E A; V. M. Varela-Díaz

    1984-01-01

    Se describe el aporte de la prueba de doble disfusión arco 5 (DD5) al diagnóstico de la hidatidosis en dos pacientes con operaciones previas. En una de ellas, asintomática, la reacción positiva a los cinco años de su última intervención quirúrgica por hidatidosis, permitió diagnosticar la presencia de quistes cuya localización abdominal fue establecida por la tomografía axial computada (TAC). En el otro caso, sintomático, aunque operado de hidatidosis nueve años antes, la positividad a la DD5...

  13. Limitaciones de la tomografia axial computada en la localizacion de quistes hidatidicos abdominales en pacientes con confirmacion inmunodiagnostica Limitations of computerized axial tomography in the localization of abdominal hydatid cysts in patients with immunodiagnostic confirmation

    OpenAIRE

    Guarnera, E A; V. M. Varela-Díaz

    1984-01-01

    Se describe el aporte de la prueba de doble disfusión arco 5 (DD5) al diagnóstico de la hidatidosis en dos pacientes con operaciones previas. En una de ellas, asintomática, la reacción positiva a los cinco años de su última intervención quirúrgica por hidatidosis, permitió diagnosticar la presencia de quistes cuya localización abdominal fue establecida por la tomografía axial computada (TAC). En el otro caso, sintomático, aunque operado de hidatidosis nueve años antes, la positividad a la DD5...

  14. Investigación y transferencia del conocimiento  histórico-educativo en el siglo XXI. Revistas y publicaciones científicas de Historia de la Educación

    OpenAIRE

    Carmen SANCHIDRIÁN BLANCO

    2015-01-01

    Se analizan los cambios, y continuidades condicionados, promovidos, provocados, estimulados o frenados por la política educativa y posibilitados por las tecnologías de la información y la comunicación: Ordenadores (cualquier dispositivo) conectados a Internet. Se ofrece un panorama de las revistas españolas y europeas de historia de la educación y del debate sobre revisiones previas o posteriores a las publicaciones. Reflexiones sobre las repercusiones de las nuevas políticas de publicaciones...

  15. Alta frecuencia de trastornos de la conducta alimentaria inespecíficos en personas obesas High frequency of non-specific eating disorders in obese person

    OpenAIRE

    A. Larrañaga Vidal; R. V. García-Mayor

    2009-01-01

    Objetivos: Determinar la frecuencia de Trastornos de la Conducta Alimentaria (TCA) Clásicos e Inespecíficos y de conductas anómalas ante la comida, en pacientes obesos adultos. Material y métodos: Cincuenta y cuatro pacientes obesos adultos atendidos consecutivamente en la Sección de Nutrición del Hospital Universitario de Vigo, 45 mujeres y 9 varones, edad media 37,5 ± 11,1 años. Sin selección previa. Grupo control: 15 sujetos adultos con normopeso (11 mujeres, 4 varones), edad media ...

  16. Factores críticos para la medición de la calidad de servicio del aseo urbano en el municipio Maracaibo

    OpenAIRE

    Alejandrina Sáez

    2011-01-01

    El objetivo de la presente investigación consiste en determinar los factores críticos para medir la calidad percibida por los usuarios del servicio de aseo urbano domiciliario en el Municipio Maracaibo. Previa revisión documental sobre calidad de servicio y aseo urbano, se diseñó una escala estructurada tomando como base el modelo SERVPEF y adicionando una dimensión para medir la incidencia de la participación ciudadana en la calidad del servicio. Para obtener la data de la prueba piloto y...

  17. Evaluación de las características del fruto de huizache (Acacia farnesiana (L.) Willd.) para su posible uso en curtiduría o alimentación animal

    OpenAIRE

    Lucía Barrientos-Ramírez; J Jesús Vargas-Radillo; Antonio Rodríguez-Rivas; Héctor Guillermo Ochoa-Ruíz; Fernando Navarro-Arzate; José Zorrilla

    2012-01-01

    El huizache (Acacia farnesiana (L.) Willd.) es una especie silvestre distribuida en el estado de Jalisco y en México, que podría ser utilizada como forraje. Se realizó un estudio para determinar análisis químico proximal (AQP), perfil de aminoácidos y degradabilidad de la materia in situ, en borregos pelibuey fistulados, utilizando el fruto (cáscara y semilla) del huizache, sin tratamiento alguno y con extracción previa de taninos. Los taninos fueron evaluados por los métodos ALCA y número de...

  18. Development of "lozenges" in anastomosing shear zone networks in foliated rocks

    OpenAIRE

    Ponce, Carlos; Carreras, Jordi; Druguet, Elena

    2010-01-01

    En el contexto de zonas de cizalla anastomosadas, los «lozenges» son cuerpos elipsoidales relativamente menos deformados que las rocas envolventes. En este trabajo de investigación se propone una tipología en 2-D de «lozenges» cuyos criterios son la homogeneidad o inhomogeneidad y la isotropía o anisotropía de las rocas. En el caso de los lozenges desarrollados en rocas anisótropas se establece una subtipología de acuerdo a la orientación de la foliación previa con respecto a la orientación d...

  19. Construcción de una visión local y colectiva para emprender iniciativas de Turismo Rural Comunitario

    OpenAIRE

    Kieffer, Maxime; Burgos, Ana

    2014-01-01

    International audience El trabajo reconoció la importancia de la visión de los actores locales, así como la posibilidad de que esa sea construida de manera colectiva, en el emprendimiento del Turismo Rural Comunitario (TRC). Utilizando un enfoque participativo, los resultados mostraron que, aun en comunidades sin experiencia previa, existe una visión local colectiva que incluye los principales elementos contenidos en las bases teóricas del TRC, aunque sea incompleta y parcial. El trabajo r...

  20. Estado de salud bucodental y presencia de lesiones orales de enfermedad injerto contra hospedador (EICH) en pacientes sometidos a trasplante alogénico de progenitores hematopoyéticos en la Región de Murcia

    OpenAIRE

    Martínez Millán, Silvia

    2016-01-01

    OBJETIVOS: 1. Evaluar el estado de salud bucodental de los pacientes sometidos alo-TPH. 2. Estudiar la frecuencia de aparición de EICH oral. 3. Estudiar la relación entre aparición de EICH oral y presencia de placa bacteriana, estado periodontal e índices de caries, ausencias y obturaciones. 4. Hacer una revisión bibliográfica sobre el protocolo de tratamiento de EICH oral. 5. Confirmar la necesidad de pautas de higiene bucodental y visitas regulares odontológicas, previas y p...