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El estrés es un proceso de interacción entre eventos del entorno biopsicosocial. Los síntomas relacionados con este, en estudiantes de medicina, puede variar a lo largo de su carrera. Se comparó la prevalencia de estrés en estudiantes de 1º a 5º año, con el objetivo de establacer si existen diferencias significativas entre ellos. La presente fue una investigación de corte transversal observacional, no experimental. El universo fue de 481 individuos (cohortes 2009-2010). En mayo 2010 se tomó una muestra probabilística, aleatoria simple, estratificada, de 116 estudiantes de 1º año y 88 de 5º año de la Escuela Luis Razetti (total 204,42% del universo). El instrumento de evaluación fue una encuesta que constaba de datos generales, Escala de Depresión, Ansiedad y Estrés (EDAS-21) y Estratificación Social de Graffar-Méndez-Castellano. Se utilizó el programa SPSS v.10.0 para el análisis de datos, nivel de confianza 95%. Respecto a la puntuación total del EDAS-21, delos estudiantes evaluados, 64,8% presentaron estrés normal y 6,7% estrés muy severo. La prevalencia de estrés de leve a muy severo en estudiantes de 1º fue significativamente mayor que de la de los de 5º año (42,7% vs. 27,8%; P<0,05). Se encontraron diferencias significativas en la frecuencia de estrés entre los estudiantes de 1º y 5º año, siendo mayor en los de 1º; lo cual puede deberse, dentro de otros factores, a la adaptación ante situaciones que generan estrés en los mismos a lo largp de su carrera

stress is considered as an interactive process between biopsychosocial events, symptoms related to it, in medical students, may vary along their careers. Stress prevalence was compared between 1º and 5º year students, to establish if significant differences exist or not. This was a cross-sectional, observational, non-experimental research. The universe was 481 individuals (cohort 2009-2010). In may 2010 a probabilistic, simple random, stratified sample of 116 students of 1º year and 88 of 5º at the School Luis Razetti was taken (total 204,42% of the universe). The evaluation instrument was a survey form consisting on general information, Depression, Anxiety and Stress Scale (DASS-21) and the Graffar-Méndez-Castellano Social Stratification. The Software SPSS v.10.0, with a 95% confidence level, was used for data analyses. Regarding the total DASS-21 score, from the evaluated students, 64.8% presented normal stress levels and 6.7% very severe stress levels. The Low to very severe stress levels prevalence in 1st year students was significantly higher than that presented in 5th year students (42.7% vs. 27,8%; P<0.05). Significant differences on stress frequency were evidenced between 1º and 5º year students, being higher in 1º year students; wich can be due, among other factors, to the adaptacion, ocurred along the years, to situacions that generate stress on their careers

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Los niños con enfermedad renal crónica encuentran un riesgo aumentado de presentar compromiso de su neurodesarrollo. El objetivo de este trabajo fue la evaluación cognitiva y adaptativa de 15 niños con insuficiencia renal crónica en tratamiento de reemplazo con diálisis peritoneal ambulatoria. El desarrollo cognitivo fue normal o superior en 3 pacientes (20%) y retrasado en 12 (80%). La conducta adaptativa fue adecuada en 8 (53%) y baja o muy baja en 7 (47%). No hubo relación entre el desarrollo cognitivo y la escolaridad materna o el nivel socio económico, ni entre la conducta adaptativa y el nivel de escolaridad materna. La relación entre el NSE y la conducta adaptativa fue significativa (p 0.04). Esto sugeriría que si bien la enfermedad renal crónica compromete el desarrollo cognitivo, un nivel socioeconómico medio/alto puede proveer oportunidades para una mejor conducta adaptativa.

Children with chronic kidney disease are at increased riskof having impaired neurodevelopment. The objective of thepresent study was to perform a cognitive and adaptive eva-luation of 15 children with chronic renal insufficiency onoutpatient peritoneal dialysis. Cognitive development wasnormal or above normal in 3 patients (20%) and delayed in12 (80%). Adaptive behavior was adequate in 8 (53%) andlow or very low in 7 (47%). No correlation was found eitherbetween cognitive development and maternal education orsocio-economic level or between adaptive behavior andeducation of the mother. A significant correlation was foundbetween socio-economic level and adaptive behavior (p0.04). This would suggest that although chronic kidney dise-ase compromises cognitive development, middle or uppersocio-economic level may provide opportunities for impro-ved adaptive behavior.

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La liofilización es una alternativa de interés como método de conservación de alimentos, la cual permite prolongar el tiempo de vida útil manteniendo significativamente las propiedades físicas y fisicoquímicas relacionadas con su calidad. El objetivo de este trabajo fue evaluar el efecto de la liofilización y la osmoliofilización sobre las cinéticas de congelación y de secado, la actividad de agua, el volumen, la porosidad y la capacidad de rehidratación en rodajas de pitahaya amarilla (Selenicereus megalanthus). Como pretratamiento osmótico a la liofilización (osmoliofilización), las rodajas se sumergieron en una solución de sacarosa con 55 ºBrix a 25ºC; se congelaron a -35°C, la sublimación se llevó a presión de vacío de 8 Pa y el secado se realizó desde -35 hasta 35°C. Los resultados de los tratamientos evidenciaron, al final del proceso, diferencias significativas en la porosidad, volumen y capacidad de rehidratación (que fueron mayores para el tratamiento liofilizado), mientras que la cinética de secado y la actividad de agua no presentaron diferencias significativas. El tratamiento de liofilización fue adecuado para la conservación de rodajas de pitahaya amarilla, ya que permitió reducir la actividad de agua por debajo de 0,4; conservó significativamente el volumen y presentó alta capacidad de rehidratación.

Freeze-drying is an interesting alternative as a food preservation method allowing to extend the shelf life and significantly preserving physical and physicochemical properties related to quality. The objective of this study was to evaluate the effect of freeze-drying and osmo-freeze-drying on the kinetics of freezing and drying, water activity, volume, porosity and rehydration capacity of sliced yellow pitahaya (Selenicereus megalanthus). As osmotic pretreatment to freeze-drying (osmo-freeze-drying), slices were immersed in a sucrose solution at 55°Brix. The slices were frozen at -35°C. The sublimation was carried at vacuum pressure of 8 Pa and drying was carried out from -35 to 35°C. The results of these treatments at the end of the process showed significant differences in porosity, volume and rehydration capacity (being higher for freeze-drying treatment), while the kinetics of drying and water activity were not significant. The freeze drying treatment was suitable for the preservation of sliced yellow pitahaya, because it helped to decrease water activity below 0.4, preserved and showed significant volumes of high rehydration capacity.

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Among the Gastric Lymphoma' chief features are the varied endoscopic appearances and the difficulty for its conventional bioptic diagnosis. In order to focusing on this problem we analyzed 15 years of experience on this matter at the "Luis Razetti" Oncological Institute. 10 cases were morphologicaly classified as follow: a) Exophytic type 5/50%. The most difficult morphology for its endoscopic diagnosis was the infiltrative type, in its large gastric folds category 2/20%, yielding a 33% of bening diagnosis. Histopathologicaly a 66% of bening diagnosis was obtained and a 33% of uncertain diagnosis. The exophytic type in its erosive protruding mass category was the second most difficult morphology fot both endoscopic and histopathologic diagnosis. When the last two categories were associated with ulceration, the malignant diagnosis increased. 40 of the cases were operated on without preoperative histological diagnosis. All the cases were operated on without preoperative histological diagnosis. All the cases corresponded with Large cells diffuse type of Non Hodgkin's Lymphoma, a diagnosis reached in only one opportunity by endoscopic biopsy. No correlation between tumoral morphology and intraparietal growth was found. 3 patients survived for more than 1 years. It can be concluded that video endoscopic methods could help to improve the endoscopic knowledge in gastric lymphoma diagnosis, while polipectomy snare biopsy, dye methods like Indigo Carmin and special techniques like mucosectomy could help to improve the histologic diagnosis, because conventional biopsy provides small and superficial samples.

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Early gastric cancer detection is still in its more elementary step in the western hemisphere, while in Japan gastric cancer is detected mainly in its early stage. The aim of this article is to analyze the Japanese method for early gastric cancer detection and staging, by sketch of certain morphologic criterions and a report of a typical case. In our case the lesion's staging was predicted as submucosal by means of endoscopy and double contrast roentgenography. Endoscopic ultrasonography complemented the analysis. The standard anatomopathological work up for early gastric cancer in Japan is also analysed. By this former method the accuracy of the initial staging by endoscopy, and radiologic means was ensured. By a correct early gastric cancer diagnosis and staging a better selection of the surgical strategy and survival can be achieved.

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