Sample records for TALIO (thallium)
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1

Rendimiento del Spect Talio201 reposo-redistribución para predecir viabilidad post infarto reciente del miocardio/ Performance of Thallium201 rest-redistribution Spect to predict viability in recent myocardial infarction

Coll C, Claudia; González E, Patricio; Massardo V, Teresa; Sierralta C, Paulina; Humeres A, Pamela; Jofré M, Josefina; Yovanovich S, Jorge; Aramburú M, Ivonne; Brugère O, Solange; Chamorro B, Hernán; Ramírez N, Alfredo; Kunstmann F, Sonia; López B, Héctor
2002-03-01

Resumen en inglés Background: The detection of viability after acute myocardial infarction is primordial to select the most appropriate therapy, to decrease cardiac events and abnormal remodeling. Thallium201 SPECT is one of the radionuclide techniques used to detect viability. Aim: To evaluate the use of Thallium201 rest-redistribution SPECT to detect myocardial viability in reperfused patients after a recent myocardial infarction. Patients and methods: Forty one patients with up to of 24 (mas) days of evolution of a myocardial infarction were studied. All had angiographically demonstrated coronary artery disease and were subjected to a successful thrombolysis, angioplasty or bypass grafting. SPECT Thallium201 images were acquired at rest and after 4 h of redistribution. These results were compared with variations in wall motion score, studied at baseline and after 3 or 4 months with echocardiography. Results: The sensitivity of rest-redistribution Thallium201 SPECT, to predict recovery of wall motion was 91% when patient analysis was performed and 79% when segmental analysis was done in the culprit region. The figures for specificity were 56 and 73% respectively. Conclusions: Rest-distribution Thallium201 SPECT has an excellent sensitivity to predict myocardial viability in recent myocardial infarction. The data obtained in this study is similar to that reported for chronic coronary artery disease (Rev Méd Chile 2002; 130: 243-50)

Scientific Electronic Library Online (Spanish)

2

EVALUACION RADIOISOTOPICA EN CARDIOLOGIA

Massardo V, Teresa; González E, Patricio; Canessa G, José
2002-01-01

Resumen en español Se revisan las aplicaciones comunes de las técnicas de medicina nuclear en cardiología. La más importante y prevalente patología cardiovascular en países desarrollados y también en Chile es la enfermedad coronaria. Diferentes aproximaciones pueden ser empleadas para su estudio, pronóstico, estadificación de riesgo y evaluación preoperatoria. Se revisan, además, el infarto miocárdico y el reconocimiento de isquemia con estudio de perfusión incluyendo nuevos pro (mas) tocolos que aplican pro- ducción de isquemia; el valor diagnóstico del SPECT de perfusión, el uso de Talio; Tc-99m Sestamibi e imágenes metabólicas con Flúor-18- Fluorodeoxiglucosa son también mencionadas Resumen en inglés The current applications of nuclear cardiology techniques are reviewed. Coronary artery disease is the most important and prevalent cardiovascular problem in most developed countries and also in Chile. Different approaches can be employed for its diagnosis and prognosis, as well as for risk stratification and preoperative evaluation. Myocardial infarction assessment and ischemia recognition with radionuclide perfusion images are also reviewed, including new protocols appl (mas) ying functional parameters addition. Viability detection after myocardial infarction or in patients with ischemic cardiomyopathy are discussed. Stress protocols with the use of exercise or pharmacological action for ischemia production, the diagnostic value of perfusion SPECT and the use of Thallium-201, Tc-99m-Sestamibi and metabolic images with Fluorine18-Fluordeoxyglucose are also mentioned

Scientific Electronic Library Online (Spanish)

3

Surco diagonal en el lóbulo de la oreja: ¿signo de enfermedad arterial coronaria?/ Diagonal earlobe crease: a sign of coronary artery disease?

Lamot, Sebastián B.; Lonegro, Gustavo G.; Hernández, Marcos; Lamot, Juan M.; Lapresa, Susana; Sobrino, Edgardo
2007-08-01

Resumen en español El surco diagonal es un signo encontrado en el lóbulo de la oreja, que estaría relacionado con la enfermedad arterial coronaria. Nuestro objetivo fue estudiar la utilidad del signo. Se examinaron 104 pacientes (entre 30 y 80 años) clasificados por sexo y edad. Cuarenta y nueve tenían enfermedad arterial coronaria diagnosticada por coronariografía (obstrucción > del 70% en una de las grandes arterias) y/o gamagrafía de perfusión miocárdica con Talio 201 (defecto f (mas) ijo). El grupo control estuvo compuesto por 55 pacientes (asintomáticos, con electrocardiograma normal). Los datos obtenidos fueron sensibilidad (61.2%), especificidad (78.2%), valor predictivo positivo de (71.4%) y valor predictivo negativo (69.3%.). Observamos una relación significativa entre la presencia de surco diagonal y enfermedad arterial coronaria. Consideramos que este signo podría resultar de utilidad en la práctica clínica, fundamentalmente para los pacientes entre 30 y 60 años. Resumen en inglés The diagonal earlobe crease is a sign theorically related to coronary artery disease. The purpose of this study was to prove the usefulness of this sign. A total of 104 patients were examined (ages 30 to 80) grouped by age and sex. Forty nine of them were diagnosed of having coronary artery disease by coronary angiography (a 70% obstruction of one of the major arteries), and/or myocardial perfusion imaging with Thallium 201 (fixed defects). The control group included 55 p (mas) atients (asymptomatic with normal electrocardiogram). Data here obtained included sensitivity (61.2%), specificity (78.2%), positive predictive value (71.4%) and negative predictive value (69.3%). We found a significant relation between the presence of the diagonal earlobe crease and coronary artery disease. We consider it a sign that could prove useful in clinical practice, mainly among patients aged between 30 and 60.

Scientific Electronic Library Online (Spanish)

4

Mineralogía y geoquímica de las micas en las pegmatitas Santa Elena y El Peñón, Provincia Pegmatítica Pampeana, Argentina

Galliski, Miguel A.; Saavedra, Julio; Márquez-Zavalía, María F.
1999-07-01

Resumen en español RESUMEN Se estudiaron las propiedades físicas y ópticas, los politipos, la composición química y la paragénesis de las micas de las pegmatitas de elementos raros Santa Elena y El Peñón. La primera es de tipo complejo, subtipo petalita y la segunda de tipo berilo subtipo berilo-columbita-fosfato: ambas pertenecen al distrito El Quemado, el más septentrional de la Provincia Pegmatítica Pampeana. Las micas son muscovitas, muscovitas litíferas, formas intermedias y (mas) lepidolitas. Las muscovitas s.I. tienen estructura 2 M, y una composición con bajos contenidos de Mn, Li, Rb, Cs, Tl e Y, un espécimen puede ser clasificado como 'muscovita rosa'. Las lepidolitas s.I. tienen estructuras del politipo 2 M, más algunas difracciones del politipo 1 M o 2 M, y comprenden algunas micas dioctaédricas y otras trioctaédricas. Son más ricas en SiO2, MnO, CaO, Li2O, Rb2O, Cs, Tl, Y y P que las muscovitas. La evolución geoquímica de las micas muestra una tendencia general con relaciones K/Rb decrecientes con la diferenciación y correlación negativa de esta relación con los contenidos de cesio, talio, itrio, litio y manganeso, en algunos casos (itrio) prácticamente lineal. Las micas litíferas de la pegmatita de subtipo petalita habrían cristalizado aproximadamente a una P de 2 a 3 kbar y a 350-400ºC, en el campo de estabilidad de espodumeno, bajo un incremento de la actividad (my ) HF, KF y LiF. Las micas de la pegmatita de subtipo berilo-columbita-fosfato habrían cristalizado en el mismo rango de P y T un poco más alta, de una fracción pobre en litio cosanguínea, pero no comagmática, con la que originó la pegmatita litífera Resumen en inglés ABSTRACT Mineralogy and geochemistry of the micas from Santa Elena and El Peñón pegmatites, Pampean Pegmatite Province, northwestern Argentina. This study describes the physical and optical properties, polytypism, chemical composition and paragenesis of a Li-Al-bearing mica suite from the northernmost pegmatite field of Pampean Pegmatite Province. The micas are from two possible cogenetic rare-element pegmatites: Santa Elena, a complex-type, petalite subtype pegmatite, (mas) and El Peñón, a beryl-type, beryl-columbite-phosphate subtype pegmatite. The micas are muscovite, lithian muscovite, mixed forms and lepidolite. The muscovite s.I. has 2 M, structure and chemistry with comparatively low contents of Mn, Li, Rb, Cs, Ti and Y; one specimen could be classified as a 'rose muscovite'. The lepidolite and mixed forms have 2 M, dominant polytypism with some scarce X-ray reflections of 1 M or 2 M, polytypes. They are higher in SiO2, MnO, CaO, Li2O, Rb2O, Cs, Ti, Y and P. Li2O ranges between 3,71 and 4,73%, and Rb2O from 0,29 to 2,53%. The geochemical evolution of the micas, illustrated by K/Rb versus lithium, manganeso, cesium, thallium and ytrium diagrams, shows a differentiation trend similar to micas from other LCT pegmatite fieids. The inferred crystallization path has evolved approximately around 2-3 kbar and 350-400ºC, in the stability field of spodumene, in a H2O-saturated environment, under increasing HF, KF and LiF activities

Scientific Electronic Library Online (Spanish)

5

Estudio comparativo de la peligrosidad de jales en dos zonas mineras localizadas en el sur y centro de México/ Comparative hazard study of mine tailings in two mining areas in Southern and Central Mexico

Romero, Francisco Martín; Gutiérrez Ruíz, Margarita
2010-01-01

Resumen en español Se realizó un estudio geoquímico y mineralógico en jales de dos zonas mineras localizadas en el sur y centro de México. Consecuente con la composición mineralógica identificada en los jales estudiados, éstos se caracterizan por contener elementos potencialmente tóxicos como arsénico (140 - 3627 mg.kg-1), cadmio (0.5 - 434 mg.kg-1), plomo (148 - 10900 mg.kg-1), cobre (0.002 -1.55 %), zinc (0.021 - 3.86 %) y hierro (2.4 - 35.7 %). Sin embargo, las concentraciones t (mas) otales de los otros elementos potencialmente tóxicos (EPT) como bario, cromo, mercurio, plata, plomo, selenio, berilio, talio, níquel y vanadio son bajas e inferiores a las concentraciones totales que podrían representar un riesgo para el ambiente y la salud de acuerdo a la Norma Oficial Mexicana de suelos contaminados NOM-147. En los dos sitios de estudio se identificaron jales oxidados de color café y jales inalterados de color gris. En el 60% de las muestras de jales oxidados del sur de México se observaron valores de pH que varían de 2.4 a 3.7, lo que indica la formación de drenaje ácido producto de la intensa oxidación de los sulfuros metálicos. Sin embargo, en el 40% de las muestras de estos jales oxidados el pH es prácticamente neutro o ligeramente básico (6.5-8.2), lo que indica que la acidez generada por la oxidación de los sulfuros fue consumida por minerales con capacidad de neutralización. De la misma manera, los valores de pH de los jales oxidados del centro de México, varían de 6.5 a 8.2, observándose en este caso todavía la presencia de calcita y wollastonita (basicidad residual). Los resultados de las pruebas de balance ácido-base permiten pronosticar que los jales inalterados y grises del sur de México serán generadores de acidez cuando se oxiden, debido a que tienen un alto potencial de acidez "PA" (media = 206 kg CaCO3 /t) y bajo potencial de neutralización "PN" (media = 121 kg CaCO3 /ton), lo que indica que no tienen suficiente cantidad de minerales neutralizadores para consumir la acidez generada. La relación de PN / PA de estos jales (media = 0.6) indica que son generadores potenciales de drenaje ácido. Las Regulaciones Ambientales Mexicanas señalan que los jales que tienen una relación de PN/PA menor a 1.2 deben de ser clasificados como generadores potenciales de drenaje ácido. Sin embargo, los jales inalterados del centro de México se pueden clasificar como no generadores potenciales de acidez debido a que su "PN" (media = 414 kg CaCO3 /t) es más alto que su "PA" (media = 71 kg CaCO3 /t) con un valor promedio de la relación PN / PA igual 5.8, lo que indica que la acidez que se pueda generar, por la oxidación de los sulfuros metálicos, será eficientemente neutralizada. Las mayores concentraciones de EPT disueltos se encontraron en los lixiviados ácidos del sur de México (arsénico = 0.4 mg.L-1, cadmio = 1.3 mg.L-1, plomo = 0.2 mg.L-1, zinc = 55 mg.L-1, y hierro = 28 mg.L-1), mientras que en los lixiviados con pH cercano al neutro de los dos sitios de estudio se encontraron bajas concentraciones de EPT disueltos, lo que indica su baja movilidad. La baja movilidad de los EPT en los jales inalterados grises se puede explicar debido a que éstos están asociados a los sulfuros metálicos, que son minerales estables bajo las condiciones actuales. En los jales oxidados, la baja movilidad de los EPT está relacionada con procesos de sorción en superficies de oxihidróxidos de Fe. Resumen en inglés Tailings from two mining zones located in the south and centre of México were geochemically and mineralogicaly studied. According to the identifed mineralogical composition, these studied tailings are characterized by its content of arsenic (140-3627 mg.kg-1), cadmium (0.5-434 mg.kg-1), lead (148-10900 mg.kg-1), copper (0.002-1.55 %), zinc (0.021-3.86 %) and iron (2.4-35.7 %). Nevertheless, the total concentrations of the other potentially toxic elements (PTE) like bariu (mas) m, chromium, mercury, silver, lead, selenium, beryllium, thallium, nickel and vanadium are below the concentrations limits that represent an environmental and health potential risk established by Mexican Environmental Regulations of contaminated soils NOM-147. In both sites oxidized tailings (brown color) and reduced tailings (gray color) were identified. 60% of the oxidized samples from the south of Mexico presented acid pH values from 2.4 to 3.7, indicating the formation of acidic drainage as a consequence of extensive sulfide minerals oxidation. However, the other 40% of these oxidized samples showed practically neutral or slightly basic pH values (6.5-8.2) as a consequence of the action of neutralizing minerals. In the same way, the pH values found in the oxidized tailings from central Mexico varied between 6.5 and 8.2, being still possible to find calcite and wollastonite (residual alkalinity) in these cases. Acid-base accounting results allow predicting that unoxidized gray tailings from south Mexico will be acid generating, when they oxidize, due to their high acid potential "AP" (mean = 206 kg CaCO3 /t) and low neutralization potential "NP" (mean = 121 kg CaCO3 /ton), which indicate insuffciency of pH-buffering minerals to consume acid generation. The ratio PN/PA of these tailings (mean NP/AP = 0.6) indicates that they are generating potentials of acid drainage. The Mexican environmental regulations indicate that tailings with a ratio of NP/AP less than 1.2 must be classified as potential generators of acid drainage However, unoxidized gray tailings from centre Mexico may be classifed as non-acid forming because it's "NP" (mean = 414 kg CaCO3 /t) is higher than its "AP" (mean = 71 kg CaCO3 /t) with a ratio of NP/AP of 5.8, and therefore suffcient pH-buffering minerals are present to balanced acid generation. The highest concentrations of dissolved PTE were found in the acidic tailings from south Mexico (arsenic = 0.4 mg.L-1, cadmium = 1.3 mg.L-1, lead = 0.2 mg.L-1, zinc = 55 mg.L-1 and iron = 28 mg.L-1), while low concentrations were found in circum-neutral tailings from both studied sites, showing low mobility of these PTE. The low mobility of PTE in unoxidized grays tailings may be explained because they are forming sulfide minerals which are stable under environmental conditions. In oxidized tailings, the low mobility of the EPT is related to sorption processes onto Fe oxy-hydroxides.

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6

Tomografía SPECT con F18-fluorodeoxiglucosa en infarto reciente del miocardio.: Caso clínico/ Fluorodexyglucose SPECT in acute myocardial infarction: case report

González E, Patricio; Coll C, Claudia; Massardo V, Teresa; Sierralta C, Paulina; Humeres A, Pamela; Aramburú M, Ivonne; Brugère O, Solange; Yovanovich S, Jorge; Ramírez N, Alfredo; Jofré M, Josefina; Chamorro B, Hernán; Kuntsmann F, Sonia; López B, Héctor
2000-09-01

Resumen en inglés We report a 50-year-old woman with a recent myocardial infarction in whom a myocardial perfusion single photon emission computed tomography (SPECT) with Thallium201201Tl SPECT to study viability and a FDG-SPECT with a dual head high-energy collimator camera were done. Images, acquired 45 min after injection, were analyzed visually. In anterior and medial apical sectors, discordance between flux and metabolism, considered a classical mismatch, was observed. Echocardiographic hypokinesia disappeared three month after revascularization (Rev Méd Chile 2000; 128: 1019-23)

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7

Thermodynamics of the thallium alkanoates VIII. Heat capacity and derived thermophysical properties of thallium(I) propanoate and pentanoate at temperatures from 6 K to 490 K

Fernández Martín, Fernando; Rodríguez Cheda, José A.; Jones, L. L.; Lin, C. C.; Westrum, Edgar F.

Heat-capacity measurements by adiabatic calorimetry at temperature T = 5 K to 350 K were supplemented by differential-scanning calorimetry (d.s.c.) into the liquid region on thallium(I) propanoate and pentanoate. Apparent phase transitions were noted for the propanoate for the crystal III-to-crystal...

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9

Thermodynamics of the thallium alkanoates VII. Heat capacity and thermophysics of thallium(I) butanoate at temperatures from 6 K to 480 K

Rodríguez Cheda, José A.; Fernández Martín, Fernando; Burns, R. J.; Westrum, Edgar F.

The heat capacity of thallium(I) butanoate has been determined by adiabatic calorimetry from temperatures T of 5 K to 350 K and by differential-scanning calorimetry (d.s.c.) from 320 K to 480 K. A transition at T = (154.2 +/- 0.5) K, two very closely spaced crystalline-phase transitions at T = 285.3...

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10
11

Thermodynamics of thallium alkanoates VI. Thallium(I) n-heptanoate revisited

Labban, Abdul K.; López de la Fuente, F. L.; Rodríguez Cheda, José A.; Westrum, Edgar F.; Fernández Martín, Fernando

The heat capacity of thallium(I) n-heptanoate has been remeasured on a new sample on which the preparative procedures were modified to eliminate the 1-1 (salt+acid) complex (soap) in a previously studied sample. The sub-ambient heat capacity of a new highly pure thallium(I) n-heptanoate is character...

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12

Thermodynamics of thallium alkanoates VI. Thallium(I) n-heptanoate revisited

Labban, Abdul K.; López de la Fuente, F. L.; Rodríguez Cheda, José A.; Westrum, Edgar F.; Fernández Martín, Fernando
1989-04-01

Digital.CSIC (Spain)

13

Thermodynamics of thallium alkanoates V. Heat capacity and thermodynamic functions of thallium(I) n-decanoate from 6 to 480 K

López de la Fuente, F. L.; Rodríguez Cheda, José A.; Fernández Martín, Fernando; Westrum, Edgar F.

The heat capacity of thallium(I) n-decanoate was measured by adiabatic calorimetry from 6 to 350 K and by d.s.c. from 200 through 480 K. Excellent overlap occurs over the common temperature range of both techniques. Four solid-to-solid transitions were found; at 232.9 K, at 288.3 K, and two more at ...

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14

Thermodynamics of thallium alkanoates V. Heat capacity and thermodynamic functions of thallium(I) n-decanoate from 6 to 480 K

López de la Fuente, F. L.; Rodríguez Cheda, José A.; Fernández Martín, Fernando; Westrum, Edgar F.
1988-10-01

Digital.CSIC (Spain)

15

Thermodynamics of thallium alkanoates III. Heat capacity and thermodynamic functions of thallium(I) n-tetradecanoate from 7 to 450 K

Ngeyi, Stanley P.; Westrum, Edgar F.; López de la Fuente, F. L.; Rodríguez Cheda, José A.; Fernández Martín, Fernando

The heat capacity of thallium(I) n-tetradecanoate was measured by adiabatic calorimetry to 350 K and by d.s.c. from 235 through 460 K. Good agreement between the methods was obtained within the common temperature range. Several phases were observed in the sample. Two solid-to-solid transitions were ...

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16

Thermodynamics of thallium alkanoates III. Heat capacity and thermodynamic functions of thallium(I) n-tetradecanoate from 7 to 450 K

Ngeyi, Stanley P.; Westrum, Edgar F.; López de la Fuente, F. L.; Rodríguez Cheda, José A.; Fernández Martín, Fernando
1987-03-01

Digital.CSIC (Spain)

17

Thermodynamics of thallium alkanoates II. Heat capacity and thermodynamic functions of thallium(I) n-heptanoate

Ngeyi, Stanley P.; López de la Fuente, F. L.; Rodríguez Cheda, José A.; Fernández Martín, Fernando; Westrum, Edgar F.

The sub-ambient heat capacity of thallium(I) n-heptanoate is characterized by two sets of transitions between 262 and 301 K. The lowest transition (at 262.8 K) has a maximum Cp, m/R ~ 700. Next, a bifurcated pair (at 267.8 and 271.7 K) has (Cp, m/R)'s ~ 200, and the highest bifurcated pair (at 297.2...

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18

Thermodynamics of thallium alkanoates II. Heat capacity and thermodynamic functions of thallium(I) n-heptanoate

Ngeyi, Stanley P.; López de la Fuente, F. L.; Rodríguez Cheda, José A.; Fernández Martín, Fernando; Westrum, Edgar F.
1985-05-01

Digital.CSIC (Spain)

20

Photophysical Studies and Excited-State Structure of a Blue Phosphorescent Gold-Thallium Complex.

Fernández, Eduardo J.; Laguna, Antonio; López-de-Luzuriaga, José M.; Monge, Miguel; Montiel, Manuel; Olmos, M. Elena
2007-03-21

Digital.CSIC (Spain)

23

Isquemia miocárdica reversible en el hipotiroidismo: comunicación de un caso/ Reversible myocardial ischemia associated to hypothyroidism: Report of one case

Quevedo L, Iván; Mosso G, Lorena; Domínguez R-T, José Miguel; Fajuri N, Alejandro; Quintana F, Juan Carlos
2001-11-01

Resumen en inglés A silent, reversible myocardial ischemia with normal coronary angiography and reversible with thyroid hormone substitution, has been recently described in hypothyroid patients. We report a 49 years old male with an abnormal exercise electrocardiogram detected in a preventive medical examination. He had laboratory evidence of hypothyroidism and a history of two years of asthenia and progressive coarsening of the voice. The Thallium myocardial perfusion study, showed an alt (mas) eration of coronary flow during exercise in the septum and lower wall of the left ventricle. Thyroid hormone substitution was started and three months later, a coronary angiography was normal. After six months a repeated Thallium perfusion study and exercise electrocardiogram were informed as normal (Rev Méd Chile 2001; 129: 1320-4)

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24

Enfermedad coronaria aneurismática severa en un adolescente con angina de esfuerzo secundaria a enfermedad de Kawasaki no diagnosticada previamente/ Severe aneurisma I coronary artery disease probably caused by Kawasaki disease. Report of one case

Díaz, Rienzi A; Aránguiz, Ernesto; Pedemonte, Oneglio; Silva, Danilo; Villablanca, Salvador; Torres, Humberto; Ríos, Gustavo
2007-09-01

Resumen en inglés We report a 16 year old male with a history of angina on exertion. A treadmill exercise test was positive for ischemia in concordance with a Thallium-201 scintigraphy showing a septal and infero-posterior reversible myocardial perfusión defect. Coronary angiography disclosed severe aneurysmal coronary artery disease. Bilateral internal mammary coronary artery bypass grafting was successfully performed. Kawasaki disease is the most likely etiology, although not confirmed

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25

Easy ketimine formation assisted by heteropolynuclear gold-thallium complexes

Fernández, Eduardo J.; Laguna, Antonio; López-de-Luzuriaga, José M.; Montiel, Manuel; Olmos, M. Elena; Pérez, Javier
2006-02-18

Digital.CSIC (Spain)