The purpose of the study was to follow-up postmyocardial infarction patients with atrioventricular conduction disorders complicating the acute phase of the disease. The study population consisted of 42 patients, 30 men and 12 women, aged 42 = 91 years (x = 65.2 +/- 12.6). Inferior and anterior myocardial infarction developed in 28 and 16 patients, respectively. The follow-up ranged from 1 to 5 years (x = 3.6). Within the first year there were 14 deaths, and 28 patients had control check-up. All the patients were submitted for physical examination, routine electrocardiography, 24-hr continuous ECG recording. At 1 year none of the patients developed new conduction disorders, whereas 71.4% of the patients revealed arrhythmias in ECG recording. Within 5 years there were 20 deaths (47.66%). A group of those who died, when compared with survivors was characterized by higher mean age, significantly more frequent presence of arterial hypertension and prior myocardial infarction.