Evaluación de la actividad cerebro-cerebelar cruzada para determinar la lateralidad del lenguaje en pacientes con tumores cerebrales / Evaluation of the crossed cerebro-cerebellar activation to determine language lateralization in patients with brain tumors

Background: The crossed cerebro-cerebellar (CCC) activation facilitates the diagnosis of cortical language lateralization, but needs to be explored with language tasks suitable for patients with different age ranges, educational attainment and eventual presence of language deficits. Aim: To determine the effect of demographic variables in the performance of three language tasks in healthy volunteers and to determine the CCC activation of these tasks as a functional magnetic resonance imaging (fMRI) paradigm in brain tumor patients. Material and Methods: The behavioral performance (correct responses and reaction time) of three language tasks (verbal fluency, semantic and phonological decision tasks) was first examined in 76 healthy volunteers balanced by age and educational level. Later, these tasks were implemented as fMRI paradigms to explore CCC language activation of 20 patients with potential diagnosis of brain tumors. Results: The performance of the verbal fluency task was affected by age. The CCC language activation was reproducible with the semantic and phonological tasks. The combination of the tasks determined typical and atypical language lateralization in 60% and 40% of our patients, respectively. Conclusions: The verbal fluency task must be implemented with care as a clinical fMRI paradigm. Our results suggest that semantic and phonological tasks can be a good alternative for brain tumor patients with language deficits.

Análisis preliminar del efecto de la edad y la escolaridad en adultos sanos en el rendimiento del Sydney Language Battery (Sydbat) en español de Chile / Preliminary analysis of the effect of age and education in healthy adults on the performance of the Sydney Language Battery (Sydbat) in Chilean Spanish

Existen 3 variantes de afasia progresiva primaria (APP), que se distinguen según el dominio lingüístico predominantemente alterado: no fluente, logopénica y semántica. Una herramienta que ayuda a su clasificación es el Sydney Language Battery (Sydbat), el cual no se encuentra validado en Chile. El objetivo del presente trabajo es analizar la posible relación entre edad, años de escolaridad y rendimiento obtenido en las subpruebas del Sydbat en adultos sanos. Participaron 38 adultos sanos a losque se les aplicó el test.El promedio de edad fue 56,8 años (DE = 8,3) y tenían una media de 13,8 años de escolaridad (DE = 3,9). Todos provenían de la Región Metropolitana. Se realizaron correlaciones de Pearson y Spearman, para explorar la correlación entre el rendimiento en las subpruebas, la edad y la escolaridad. Considerando la variabilidad en el rendimiento en las subpruebas, se realizaron modelos uni y multivariados. Se encontraron correlaciones significativas entre edad y la subprueba comprensión (p<0,05) y los años de escolaridad con las subpruebas asociación semántica (p<0,001) y nominación (p<0,01). En personas con más de 12 años de escolaridad, el puntaje en la subprueba asociación semántica varió aproximadamente 2 puntos, con respecto a personas con menos de 12 años de escolaridad (p<0,01). Se concluye que las variaciones en el rendimiento del test, dependen la edad y la escolaridad. A mayor edad, menor es el rendimiento en la subprueba de comprensión. A mayor escolaridad, mayor es el rendimiento en las subpruebas de asociación semántica y nominación. El efecto mencionado debe ser considerado en el proceso de validación de Sydbat.

There are 3 variants of primary progressive aphasia (APP), which are distinguished according to the predominantly altered linguistic domain: non-fluent, logopenic, and semantic. A tool that helps in its classification is the Sydney Language Battery (Sydbat), which is not validated in Chile. The objective of this work is to analyze the possible relationship between age, years of schooling and performance obtained in the Sydbat subtests in healthy adults. 38 healthy adults participated in the test. The average age was 56.8 years (SD = 8.3) and they had a mean of 13.8 years of schooling (SD = 3.9). They all came from the Metropolitan Region. Pearson and Spearman correlations were performed to explore the correlation between subtest performance, age, and schooling. Considering the variability in performance in the subtests, univariate and multivariate models were performed. Significant correlations were found between age and the comprehension subtest (p <0.05) and the years of schooling with the semantic association (p <0.001) and nomination (p <0.01) subtests. In participants with more than 12 years of schooling, the score in the semantic association subtest varied approximately 2 points, with respect to people with less than 12 years of schooling (p <0.01). It is concluded that the variations in test performance depend on age andeducation. The older participants are, the lower their performance on the comprehension subtest. The higher the schooling, the higher the performance on the semantic association and nomination subtests. The mentioned effect must be considered in the Sydbat validation process.

Sensibilidad y especificidad del Test ScreeLing en usuarios afásicos en etapa aguda: un análisis preliminar / Sensitivity and Specificity of the Spanish version of the ScreeLing Test in aphasic patients at the acute phase: a pilot study

En Chile, entre un 20% y un 38% de los usuarios que sufren un ataque cerebro-vascular (ACV) presentan afasia. Pese a su alta prevalencia no existen herramientas validadas que permitan realizar una caracterización lingüística temprana de la afasia. Por lo anterior, el objetivo del presente trabajo es analizar la sensibilidad y especificidad de la versión en español del ScreeLing en una muestra de usuarios afásicos después de producido un ACV. Se trata de un estudio transversal analítico en el cual se aplicó el test ScreeLing a 13 usuarios afásicos tras primer evento de ACV en etapa aguda (< 6 semanas tras ACV) y a 56 adultos neurológicamente sanos. Adicionalmente, se evaluó el nivel comprensivo y el lenguaje espontáneo de usuarios con afasia, con la versión abreviada del Token Test y Escala de Severidad de la Afasia (ASRS). Se construyeron modelos mediante regresiones logísticas, obteniendo sus respectivas áreas bajo la curva ROC. Los resultados muestran que el equilibrio entre sensibilidad y especificidad para el puntaje global del test ScreeLing se estableció en 67 puntos, obteniendo una sensibilidad del 94,6% y especificidad del 100%. El área bajo la curva ROC alcanzó 0,99 (IC 95%: 0,97-1,00). En las subpruebas sintáctica y fonológica se alcanzó un puntaje de corte de 21 puntos, mientras que en la subprueba semántica se lograron 22 puntos. Se concluye que el ScreeLing en español posee una alta sensibilidad y especificidad para la detección de déficits lingüísticos post ACV similar a los resultados encontrados en la versión original del test en holandés. Esfuerzos futuros deben concentrarse en ampliar la muestra de usuarios afásicos con distintos perfiles de severidad.

In Chile, aphasia is present in 20% to 30% of stroke patients. Currently, speech and language therapists do not have a standardized test to characterize aphasic patients' linguistics disorders at the acute phase. The aim of this study iso analyze the sensibility and specificity of the Spanish version of the ScreeLing test in aphasic patient post-stroke at the acute stage. To do so, in a transversal study design, acute aphasic patients (< 6 weeks post-stroke) and healthy adults were evaluated with the Spanish version of the ScreeLing test. Additionally, language comprehension and spontaneous speech were assessed with the shortened version of the Token Test and the Aphasia Severity Rating Scale, respectively. We calculated the Area Under ROC Curve (AUC) to choose the cut-off that provided the best balance between sensibility and specificity. We included 13 aphasic patients and 56 healthy adults. The best balance between sensibility and specificity was found to be with 67 points, with a sensibility of 94,6% andspecificity of 100%. The AUC ROC was 0,99 (IC 95%: 0,97-1,00). For the subtest measuring syntax and phonology, the cut-off score was 21 points, and for the semantic subtest, 22 points. In conclusion, the Spanish version of the ScreeLing test, similar to its original Dutch version, demonstrated high specificity and sensibility to detect linguistic deficits in acute aphasic patients post-stroke. Future efforts aim to increase the sample size of patients considering differentlanguage severity profiles.

Epidemiología de las muertes prematuras en Chile en la década 2001-2010 / Epidemiology of premature deaths in Chile between 2001 and 2010

Background: Years of potential life lost (YPLL) is a parameter that allows to analyze premature deaths. Aim: To study the causes, differences by gender, geographic variations and the trend of premature deaths in the last decade in Chile. Material and Methods: Using death databases published by the Ministry of Health, YPLL were calculated for the decade 2001-2010, using the method proposed by the Organization for Economic Cooperation and Development. Results: The standardized annual average YPLL rate in Chile in the study period was 4.703 per 100,000 inhabitants. Trauma, cancer and cardiovascular diseases accounted for 68% of YPLL. The male/female YPLL ratio was 2.07; for trauma and mental disorders, the male/female ratio for YPLL was over 5; for cardiovascular and respiratory diseases the male/female ratio was over two. Regions with a higher proportion of rural areas had higher YPLL rates. Conclusions: The main causes of YPLL are potentially preventable. Further studies should be carried out to identify risk factors for premature death.

Eficacia de un programa educativo estructurado en población diabética chilena / Effectiveness of a structured educative program in Chilean diabetic patients

Background: Structured educative programs have demonstrated their usefulness as a strategy to improve metabolic control in diabetic patients. Aim: To evaluate the effectiveness of a structured educative program for Chilean diabetic patients. Material and Methods: A randomized clinical trial in diabetic patients with glycosylated hemoglobin over 7.5%. One hundred fifteen patients were studied, 59 patients participated in the structured educative program (experimental group) and 56 patients received no structured education (control group). Patients were followed for 12 months. Results: Between baseline and 12 months of follow-up, glycosylated hemoglobin changed from 10.05 to 9.11% in experimental patients and from 9.86 to 9.25% in controls. No significant differences between experimental and control groups in other clinical and metabolic parameters were observed. In the experimental group, glycosylated hemoglobin reductions differed among the different educators who carried out the program. Conclusions: A structured educative program resulted in a 35% greater reduction in glycosylated hemoglobin levels, compared with a control group. Metabolic control improvement differed between the educators who carried out the program.

Estudio Clínico epidemiologico de la enfermedad de chagas / Epidemiologic clinic study of the chagas disease

En 1978 iniciamos desde la Consulta de Chagas del Departamento de Medicina del Hospital Central "Antonio María Pineda", el estudio de los pacientes con serología positiva para la Enfermedad de Chagas, con el fin de conocer características Clínico-epidemiológicas de nuestros pacientes y por otro lado al comprobar la presencia del parásito en la sangre mediante xenodiagnóstico, ofrecerles la oportunidad de tratamiento parasitológico a los pacientes en fase latente de la enfermedad. El propósito de este trabajo es ofrecer los detalles de los hallazgos clínicos-epidemiológicos encontrados en 578 pacientes examinados, de los cuales 512 eran de sexo masculino y 66 femenino; del total de pacientes 400 procedían del medio rural y 178 del área urbana. 48 presentaron xenodiagnóstico positivo y de ellos 36 fueron tratados con Nifurtimox y 12 con Benznidazol. Se encontró electrocardiograma normal en 493 pacientes y alterado en 85 de ellos