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Etiological agent is the parasite Trypanosoma cruzi
Chagas is one of the most common causes of AV block worldwide
Most frequent & important manifestation is chronic panmyocarditis resulting in dilated cardiomyopathy
RBBB with or w/out left anterior fascicular block is the most common conduction defect
Other characteristic ECG abnormalities include atrial and ventricular extrasystoles, intraventricular and/or AV conduction disturbances, and primary ST-T wave changes
References
Elizari M, Chiale P. Cardiac arrhythmias in Chagas' heart disease. Journal of cardiovascular electrophysiology.1993 vol:4 iss:5 pg:596 -608