Does a spontaneous cure for chagas' disease exist?

Six Costa Rican Chagas' disease patients, with wellknown acute phase history and no specific treatment were examined in several occasions during 39, 24, 32, 16 and 14 years, respectively, from the onset. Nome of the patients presented heart abnormalities as revealed by the conventional EKG and...

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Bibliographic Details
Main Authors: Rodrigo Zeledón, João Carlos P. Dias, A. Brilla-Salazar, J. Marcondes de Rezende, Luis G. Vargas, Andrea Urbina
Format: Article in Journal/Newspaper
Language:English
Published: Sociedade Brasileira de Medicina Tropical (SBMT) 1988
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Online Access:https://doaj.org/article/5cdcd58a4c2148018bdb1043c19e2c72
Description
Summary:Six Costa Rican Chagas' disease patients, with wellknown acute phase history and no specific treatment were examined in several occasions during 39, 24, 32, 16 and 14 years, respectively, from the onset. Nome of the patients presented heart abnormalities as revealed by the conventional EKG and ergometry, exceptfor one of them with an incomplete block of the right bundle branch. Also, no alterations of the oesophagus motility was detected manometrically except for another patient who presented a slight hypersensivity reaction to a pharmacological test (Mecholyl). Three out of six patients became serologically negative in 1981, remaining as such until 1986. Besides the conventional serology, the search of protective ("lytic") antibodies was also performed in 1985 and 1986, being completely negative in one of the "cured" patients and dubious in the other two. The hypothesis that these three patients had as spontaneous cure, based on the clinical, serological and parasitologica l findings is discussed. Um grupo de pacientes com doença de Chagas vem sendo acompanhado desde a fase aguda, na Costa Rica, com tempos de evolução entre 14 e 44 anos (mediana de 32 anos). Em todos a doença aguda foi bem comprovada, não sendo realizado tratamento específico em nenhum deles, contra o Trypanosoma cruzi. Todos apresentaram pelo menos uma sorologia positiva ao longo da fase crônica, mas em três deles as técnicas sorológicas convencionais se tomaram parmanentemente negativas em diversos exames ealizados em diferentes laboratórios, entre 1981 e 1986. Nestes três pacientes também a pesquisa de anticorpos líticos foi negativa (um caso) ou negativo-duvidosa (dois casos), permanecendo consistentemente positiva nos três outros pacientes com sorologia convencional reagente. Atualmente todos os seis pacientes se apresentam assintomáticos e com xenodiagnóstico negativo. Apenas um deles apresenta distúrbio eletrocardiogràfico mínimo e inespecífico (bloqueio incompleto do ramo direito) e, um outro, pequeno retardo do trânsito esofagiano à ...