Guiding questions for appraising epidemiologic literature.

OBJECTIVE: Scientific findings need to be summarized for the better understanding of the community and for the development of the respective preventive actions that they espouse, suggest, or imply. The news media play a critical role in communicating health information to the public. Among chronic diseases, cancer receives a great deal of attention from the media, possibly because of its position as a leading cause of death. While the news media are vital to the dissemination of health information, one of the main information sources comes from epidemiological studies. Thus, it is important that health professionals interpret the results of these studies in order to efficiently communicate the results in a thorough and comprehensible manner. This special article aims to guide health professionals through the process of reading and interpreting the most relevant components of epidemiological literature. METHODS: Guiding questions were prepared based on the main components of the aforementioned literature. RESULTS: An abstract that was chosen from the available literature was used for the responses to the proposed guiding questions. CONCLUSION: We expect that reading the proposed questions will improve the communication and dissemination of epidemiological findings, thereby contributing to the understanding of the health problems of our community. Also, we expect the readers to visit the recommended web sites presented at the end of this document for more complete definitions of the epidemiological terms found herein.

Etiología viral en el síndrome de Guillain-Barré: buscando una respuesta a lo idiopático / Viral etiology associated with Guillain-Barré Syndrome: seeking an answer to the idiopathic

El Síndrome de Guillain-Barré (SGB) es un raro trastorno del sistema nervioso, donde el sistema inmunológico del paciente ataca las neuronas periféricas en extremidades, causando debilidad muscular, pérdida de sensibilidad y a veces parálisis total. El origen de este trastorno, ha sido asociado a  respuestas inmunes desencadenadas luego de la  infección por Campylobacter spp.   Sin embargo, cuando no existe una causa evidente de la enfermedad, esta no suele ser investigada debido al mayor interés que requiere el tratamiento. Por ello, la mayoría de los casos  se notifican como origen idiopático.  Entre Enero y Marzo de 2016 a nivel mundial se registraron brotes del SGB en 8  países, vinculados con la emergencia del virus Zika. En Perú, desde finales de 2018 ha reportado con mayor frecuencia brotes de SGB y aunque no se ha confirmado asociación con Zika, el incremento de casos, la extensión geográfica donde se produjeron y las características clínicas de los pacientes afectados, tienen patrones comunes que llevan a sospechar un origen infeccioso principalmente de tipo viral . Por lo tanto, es importante conocer la evidencia científica actual acerca del rol que desempeñan algunos virus en este síndrome, permitiendo ampliar nuestro panorama epidemiológico con nuevas herramientas para hacer frente a esta enfermedad.

Guillain-Barré Syndrome (GBS) is a rare disorder of the nervous system, where the patient's immune system attacks the peripheral nerve cells in the arms and legs, causing muscle weakness, loss of sensation and sometimes total paralysis. The origin of this disorder has been associated with immune responses triggered by post-infection with Campylobacter spp. However, when there is no obvious cause of the disease, it is usually not investigated due to the greater interest in the treatment. Therefore, most cases are reported as idiopathic origin. Between January and March 2016 worldwide, GBS outbreaks were reported in 8 countries, linked to the emergence of the Zika virus. In Peru, since the end of 2018, outbreaks of GBS have been reported more frequently and although no association with Zika has been confirmed, the increase in cases, the geographical extension where they occurred and the clinical characteristics of affected patients, have common patterns that lead to suspect an infectious origin mainly of viral type. Therefore, it is important to know the current scientific evidence about the role that some viruses play in this syndrome, allowing us to expand our epidemiological picture with new tools to address this disease

Uso de la imagen radiológica y serología por Western Blot para el diagnóstico de la neurocisticercosis en un hospital del norte del Perú / Use of radiological imaging and serology by Western Blot for the diagnosis of neurocysticercosis in a hospital in northern Peru

Introducción: La neurocisticercosis (NCC) es una zoonosis parasitaria del sistema nervioso central causada por el céstodo Taenia solium, y que afecta a países en desarrollo y con escaso saneamiento básico. Objetivo: Describir el uso y la concordancia de la imagen radiológica por tomografía (TAC) o resonancia magnética (RM) y serología por western Blot (WB) en el diagnóstico de la NCC en un hospital del norte del Perú. Material y Métodos: Estudio observacional retrospectivo. La historia clínica fue la unidad de análisis. Los casos se buscaron en la oficina de Epidemiología mediante el CIE-10- B69 y registro del Laboratorio de Parasitología, Metaxénicas y Zoonosis del mismo hospital, en el periodo del año 2015 al 2017. Resultados: Se estudiaron 67 historias clínicas, que cumplían con los criterios diagnósticos absolutos de NCC. Los pacientes fueron varones en el 55,2 % y tuvieron una media de edad de 40,2 (±17,8) años. El 35,9% tuvieron un resultado positivo por WB (19/39), las lesiones quísticas con escólex fueron observada en el 25,4% de las TAC y en el 29,6 de las RM. La concordancia observada entre la prueba serológica con TAC y RM fue escasa, siendo (Kappa=0,073, IC95%: 0,053 ­ 1,084) y (Kappa=0,112, IC95%: 0,092 ­ 1,092) y un porcentaje de acuerdo de 42,0% y 45,7% respectivamente. Conclusiones: Se observó uso diferenciado y escasa concordancia entre la prueba serológica por WB e imagen radiológica en pacientes con diagnóstico de neurocisticercosis en la población estudiada.

Background: Neurocysticercosis (NCC) is a parasitic zoonosis of the central nervous system caused by the tapeworm Taenia solium, which affects developing countries with poor basic sanitation. Objective: To describe the use and concordance of radiological tomography (CT) or magnetic resonance imaging (MRI) and western blot (WB) serology in the diagnosis of NCC in a hospital in northern Peru. Material and Methods: Retrospective observational study. The medical history was the unit of analysis. The cases were searched in the Epidemiology office using the ICD-10-B69 and registry of the Laboratory of Parasitology, Metaxenics and Zoonoses of the same hospital, in the period from 2015 to 2017. Results: 67 medicales records were studied, which complied with the absolute diagnostic criteria for NCC. The patients were men in 55.2% and had a mean age of 40.2 (± 17.8) years. 35.9% had a positive result by WB (19/39), cystic lesions with scolex were observed in 25.4% of the CTand in 29.6 of the MRI. The concordance observed between the serological test with CTand MRI was poor, with (Kappa = 0.073, 95% CI: 0.053 - 1.084) and (Kappa = 0.112, 95% CI: 0.092 - 1.092) and a percentage of agreement of 42.0% and 45.7% respectively. Conclusions: Differentiated use and poor concordance between the WB serological test and radiological imaging are performed in patients with a diagnosis of neurocysticercosis in the studied population.