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Sarcoidosis is a multisystemic disease in which lung involvement is common. Its incidence and prevalence have been extensively studied, but with contradictory results because of the lack of standard diagnostic criteria, variations in the methods for detecting cases, and the low sensitivity and specificity of diagnostic tests. Prognosis is generally favorable. Many of those affected remain asymptomatic and remission often occurs spontaneously, although between 10% and 30% of the patients have chronic disease and permanent deterioration in lung function. Sarcoidosis is caused by an external agent that triggers a characteristic immune response in genetically susceptible individuals. Environmental, occupational, and genetic factors have all been implicated, but research is still in the early stages. Case-control studies, as well as advances in molecular biology, will help to identify genetic susceptibility factors and to understand the different phenotypes of sarcoidosis.
Key words:
Sarcoidosis
Epidemiology
Etiology
La sarcoidosis es una enfermedad multisistémica que afecta frecuentemente al pulmón. Su incidencia y prevalencia han sido ampliamente estudiadas, pero la falta de estandarización del diagnóstico, los diferentes métodos de detección de casos y la escasa sensibilidad y especificidad de las pruebas diagnósticas explican los datos discordantes. El pronóstico es generalmente favorable. Gran parte de las personas afectadas no manifestarán nunca síntomas y muchas tienen remisión espontánea. El curso es crónico en el 10-30% de los casos, con un deterioro permanente de la función pulmonar. La enfermedad es el resultado de la acción de un agente externo que desencadena la respuesta inmunitaria característica en individuos genéticamente susceptibles. Se han implicado factores ambientales, ocupacionales y genéticos, pero las investigaciones están todavía en los inicios. Estudios de casos y controles, así como los avances en biología molecular, ayudarán a definir los factores de susceptibilidad genética y a entender los distintos fenotipos de la sarcoidosis.
Palabras clave:
Sarcoidosis
Epidemiología
Etiología
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