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Search Results: 1 - 10 of 23544 matches for " Fernando; Belziti "
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Validación de un instrumento para la evaluación de la interpretación de los resultados de estudios de investigación en los residentes de un hospital universitario Validation of an instrument to assess research critical appraisal skills in residents in a university hospital
Rodolfo Pizarro,Alfredo Eymann,Fernando Rubinstein,César Belziti
Educación Médica , 2011,
Abstract: Objetivo. Validar por el método de grupos extremos un instrumento para evaluar la interpretación de las pruebas estadísticas más utilizadas en residentes de un hospital universitario. Sujetos y métodos. Respondieron 272 residentes. La media de respuestas correctas fue del 45%. Resultados. No hubo diferencias entre género, especialidad ni a os de formación. La fiabilidad fue aceptable (alfa = 0,83) y la diferencia entre grupos extremos fue significativa (0,45 frente a 0,91). Conclusiones. Los residentes mostraron déficits en interpretación crítica de estudios de investigación, hallazgo que es consistente con otros centros internacionales. Aim. To validate an instrument to assess research critical appraisal skills in residents in a university hospital by the extreme groups method. Subjects and methods. 272 residents completed the questionnaire. The mean of correct answers was 45%. Results. No significant differences between gender, specialty or post-graduate year were found. Reliability (alpha = 0.83) was acceptable and difference between extreme groups was significant (0.45 vs. 0.91). Conclusions. Residents showed poor skills to interpret typical results of clinical studies, finding consistent with other countries.
Validación de un instrumento para la evaluación de la interpretación de los resultados de estudios de investigación en los residentes de un hospital universitario
Pizarro,Rodolfo; Eymann,Alfredo; Rubinstein,Fernando; Belziti,César; Figari,Marcelo; Blanco,Osvaldo; Durante,Eduardo;
Educación Médica , 2011, DOI: 10.4321/S1575-18132011000300007
Abstract: aim. to validate an instrument to assess research critical appraisal skills in residents in a university hospital by the extreme groups method. subjects and methods. 272 residents completed the questionnaire. the mean of correct answers was 45%. results. no significant differences between gender, specialty or post-graduate year were found. reliability (alpha = 0.83) was acceptable and difference between extreme groups was significant (0.45 vs. 0.91). conclusions. residents showed poor skills to interpret typical results of clinical studies, finding consistent with other countries.
Síndromes de insuficiencia cardíaca aguda
Belziti,César A.;
Revista argentina de cardiolog?-a , 2006,
Abstract: acute heart failure syndromes represent a growing problem which causes an impact on the population's health and economic status. despite this fact, there is no standardization in basic aspects such as its definition, classification and treatment goals. regarding pharmacological treatment, randomized and controlled trials have only been published recently, but their results have not been conclusive; thus their findings cannot be fully applied to evidence-based medicine. the lack of information about acute heart failure contrasts with the large amount of data available on chronic heart failure and ischemic syndromes. we propose to design strategies that focus on early diagnosis and treatment, which will help to improve results in patients with acute heart failure syndromes.
Precondicionamiento isquémico
César A. Belziti
Revista Argentina de Cardiología , 2007,
Abstract:
Síndromes de insuficiencia cardíaca aguda
César A. Belziti
Revista Argentina de Cardiología , 2006,
Abstract: Los síndromes de insuficiencia cardíaca aguda constituyen un problema creciente con impacto sobre la salud y la economía de la población. A pesar de esto, no existe uniformidad en algunos aspectos básicos, como su definición, clasificación y objetivos del tratamiento. En el área farmacológica, recién desde los últimos a os se dispone de estudios aleatorizados controlados, con resultados no concluyentes, por lo que aún son poco aplicables los postulados de la medicina basada en la evidencia. Todo esto contrasta con lo que ocurre con la insuficiencia cardíaca crónica y en los síndromes isquémicos. Se propone dise ar estrategias que prioricen el diagnóstico y el tratamiento precoz para optimizar los resultados.
Es necesario guiarse por parámetros ecocardiográficos para indicar terapia de resincronización?
Eduardo Guevara,César A. Belziti
Revista Argentina de Cardiología , 2008,
Abstract:
La circulación cerebral en condiciones normales y patológicas VI: el caso del vasoespasmo
Fontana,Horacio; Belziti,Héctor; Buratt,Sebastián;
Revista argentina de neurocirug?-a , 2009,
Abstract: the basal brain arteries are a system of high flow velocity and high shear stress and energy dissipation, with collateral vessels that get profit from those facts, with a low pressure, that could have some influence in the ischemic pathology at this level, and a distal zone where the flow arrives with lower energy, comparatively with extracranial vessels of the same calibre. it is possible that the increase of flow velocity at the basal arteries after sah be a consequence of a diminished peripheral resistance due to autoregulation abolition. because of the principle of energy preservation, the increase in velocity diminishes the lateral pressure producing a passive diameter decrease of the artery, increasing the width of the wall, that increases the vascular tone, and tends to decrease the diameter, closing a noid hemorrhage using a transient hyperemic response test of vicious circle. other factors are the extraluminal pressure and the presence of clots outside the vessel wall. with abolished autorregulation, ischemia is impending, facilitated by the increased resistance opposed by the diminished diameter of the vessels. the intracranial hypertension can be explained by the spotaneous or iatrogenic hyperemia. the microcirculatory trouble proposed can be assessed by the cerebral circulatory time, the transient hyperemia test, the test of acetazolamide and the reactivity to the increase in pco2. the abolition of autorregulation so displayed, precedes vasospasm for days. this mechanical physiopathological process is presented hypothetically, with its eventual therapeutic consequences.
Fístulas durales de la proximidaddel seno sagital superior.: revisión selectiva
Requejo,Flavio; Fontana,Horacio; Belziti,Héctor; Recchia,Mario;
Revista argentina de neurocirug?-a , 2006,
Abstract: weperformed a selective bilbiographic review about dural fistulas that involvedthe superior sagital sinus to know its phisiopathology, clinical symptoms,diagnosis and treatment. the dural fistula of the region of the superiorsagittal sinus is a vascular anomaly characterized by an abnormalarteriolarvenous communication in the dura mater near the sinus wall. becauseof the arterialized cerebral veins, intracranial hemorrhage is the most commonform of presentation of this infrequent disease. feeding arteriolar rami fromthe superficial temporal and meningeal arteries commonly come from both sides.in these cases the anomaly lies in the sinus wall without involvement of thesinus lumen. less frequently leptomeningeal rami of the internal carotid and orvertebral artery feed the fistula. in these patients, the sinus is totally orpartially occluded and the veins are filled with arterial blood by reflux. acomplete and selective angiography is mandatory when this illness is suspected.the goal of the treatment is to eliminate the arterial flow in the cerebralveins. it can be accomplished by means of surgical or endovascular methods,through the arterial or venous side.
La circulación cerebral en condiciones normales y patológicas V: El aneurisma, aspectos dinámicos
Fontana,Horacio; Belziti,Héctor; Buratti,Sebastián;
Revista argentina de neurocirug?-a , 2008,
Abstract: there are four types of aneurysm model: 1) "in vitro". they allow to study qualy and cuantitatively cases of complex circulation. 2) "in vivo". the creation of different models in experimental animals allowed a better knowledge of the circulatory features of aneurysms and to hypothesize about their origin. 3) post mortem "in vitro" replicas of real human aneurysms on elastic material, allow to analyze the circulation under different conditions in "aneurysms" morphologically similar to human's. 4) computerized simulation of circulation in virtual 3d replicas of human aneurysms, obtained from different image studies. it is the last developement in the field, and has been achieved through recent advances in the performance of computers and new software. in respect to the relationship between the sack and parent vessels, aneurysms had been classified as: 1) lateral, 2) at the origin of a colateral vessel, 3) terminal in the same axis of the parent vessel, 4) terminal forming angle with the parent vessel. in simplified terms, the flow remains the same for all types of aneurysm. the inflow enters as a jet at the distal portion of the neck and strikes the distal wall of the sack in variable extension (impact zone), after its relation with the parent vessel and, in the terminal type, after the geometric assimetry of the system, specially for those in the axis of the parent vessel. major diameter of the neck increase the flow and makes it more similar to the basic description. narrowness of the neck make the flow sluggish and atypical in the sack. the rupture of the aneurysm could be ascribed to the tensión in the wall, be it dynamic in the high flow ones (broad neck, favorable geometry) or static, in those of low flow (narrow neck, unfavorable geometry). as it was to be assumed, each model has advantages and desadvantages and even if the advancemets are remarkable, details of the flow in the sackc as well as the parent vessels remain inaccessible.
Algunas consideraciones acerca de la historia de la estimulación cortical
Buratti,Sebastián; Belziti,Héctor; Beldi,María Florencia;
Revista argentina de neurocirug?-a , 2010,
Abstract: en el presente trabajo realizamos un recorrido por los principales hechos históricos que marcaron un hito en la historia de la estimulación cortical. la historia comienza a fines del siglo xviii con el descubrimiento de las fuentes de energía eléctrica por volta y galvani. gracias a estos descubrimientos, los pioneros en la estimulación cortical theodor fritsch y eduard hitzig realizaron su estudio en perros y lograron determinar que la corteza era excitable y que los músculos de un lado del cuerpo eran inervados por la corteza contralateral. posteriormente otros lograron desarrollar la estimulación cortical en humanos. en la actualidad la estimulación cortical forma parte de la evaluación prequirurgica en pacientes candidatos a cirugía de la epilepsia y también como método de localización para la resección lesional.
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