Contribuiçäo ao conhecimento da cardiopatia chagásica aguda: estudo sistematizado dos sistemas excito-condutor e nervoso autônomo intracardíaco em caso autóctone do Acre / A contribution to the knowledge of acute chagasic cardiopathy: a systematized study of the conducting system and the autonomic intracardiac nervous system in an autochthonous case in Acre

The histopathology of the heart is described in an acute case of Chagas' disease (DC). Lesions involving the conducting system (SC) and the autonomic intracardiac nervous system (SNAIC) are emphasized. Light microscopy showed acute pan-carditis with plenty of Trypanosoma cruzi amastigotes within heart muscle cells. Multiple inflammatory foci were found in the SC with parasitic nests within the atrioventricular node and left his bundle. There were also severe atrial periganglionitis and perineuritis with or without peripheral involvement of those structures. Apparently there was no cardiac neuronal depopulation. The epidemiological study suggested transmission through Rhodnius pictipes. To the best of our knowledge, this is the first reported case of acute DC from the Amazonian basin with systematized microscopy study of the SC and SNAIC.