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[Clinical value of statistical analysis of cardiac rhythm in patients with acute myocardial infarction].

Sinus rhythm was analysed by 1250 rhythmograms, using a computer and a specially-designed cardiac rhythm analyzer RKAS-01, in 220 patients with acute myocardial infarction on days 1, 2, 3, 5, 10, 15, 30 and 40 after the attack. A combination of rhythm structure indicators, reflecting the severity of cardiac affection in a more complete fashion has been evolved. It comprises 6 parameters: sigma 15 min, P1, P2, P3, RR/sigma, sigma pp. As the severity of the condition increases, there is an adaptive decrease in rhythm variability, which is reflected in decreased sigma 15 min and sigma pp and increased P1, P2, P3, and RR/sigma. Adaptive regulation was disrupted in 1/4 of the grave cases which was reflected in alternating low-variability and high-variability segments on the rhythmogram. The predictive value of the combination and its significance for the monitoring of patients with acute myocardial infarction are demonstrated.