title: [Late potentials and variability of cardiac frequency in chronic chagasic myocardiopathy and other myocardiopathies].
abstract: In patients suffering dilated cardiomyopathy, chagasic or not, and in healthy volunteers we applied signal-averaged electrocardiography to detect late potentials and to study heart autonomic control. Thus, with non-invasive methods, we were able to explore the progress of depolarization and heart rate variability. It was found that Chagasic patients have more late potentials and abnormalities in the heart variability; with less co-morbid process when compared with patients suffering miscellaneous cardiomyopathies. These preliminary findings corroborate and expand previous observations by several authors. The signal-averaged electrocardiogram is a valuable tool for clinical diagnosis and research, particularly for studies on dilated cardiomyopathy, specially those with parasitic etiology.
authors.affiliation: Div. de Estudios de Posgrado, Facultad de Medicina, UNAM, México, D.F.
authors.forename: M
authors.initials: M
authors.lastname: Vallejo
authors.forename: K
authors.initials: K
authors.lastname: Reyes
authors.forename: P A
authors.initials: PA
authors.lastname: Reyes
authors.forename: J A
authors.initials: JA
authors.lastname: González Hermosillo
mesh_terms: D000328:Adult; D002311:Cardiomyopathy, Dilated / Q000503:physiopathology*; D002598:Chagas Cardiomyopathy / Q000503:physiopathology*; D015897:Comorbidity; D004562:Electrocardiography; D005071:Evoked Potentials; D005260:Female; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged
vernacular_title: Potenciales tardíos y variabilidad de la frecuencia cardiaca en la miocardiopatía chagásica crónica y otras miocardiopatías.