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The purpose of the study was to contribute to t h improvement of straitification of post-myocardial infarction patients at increased risk of malignant ventrticular arrhythmia (MVA). Power spectral analysis of heart period variability (HFV) was used as a non-invasive tool to assess cardiac autonomic control. Three groups were used: (I) post-myocardial infarcion patients with MVA; (2) post-myocardial infarcion patients without MVA; and (3) a control group without heart disease. Spectral analysis of HPV (AR model) was performed on four minute long RR-interval tame series derived from consecutive hours of Holter ECG. Significant decrease of powers of mid-frequency (MF) (70–150 mHr) and high- frequency (HF) (150–450 mHz) spectral components of HPV was obtained in Group 1 as compared to Group 2 (p = 0.001 and p = 0.02, respectively). The were no significant differences between groups concerning the power of …