24-HOUR DISTRIBUTION OF VENTRICULAR EXTRA SYSTOLES IN RELATION TO PRESENCE OF LEFT-VENTRICULAR ADDITIONAL CHORDAE OR AND MITRAL-VALVE PROLAPSE/

Distribution of frequent ventricular extrasystoles over 24 hours was e xamined by Holter ECG monitoring in 13 patients with false left ventri cular tendons (anomal chordae tendineae), 8 patients with mitral valve prolapse and 23 patients with combination of left ventricular false t endons and mitral valve prolapse. The patients had no other sign; of o rganic heart disease. Differences In diurnal distribution of ventricul ar extrasystoles between groups were Pound. During daily activity pati ents with mitral valve prolapse had increased frequency of ventricular extrasystoles while patients with left ventricular false tendons had Insignificant decrease In frequency of ventricular extrasystoles. Pati ents with combination of mitral valve prolapse and left ventricular fa lse tendons had diurnal distribution of ventricular extrasystoles simi liar to patients with ''isolated'' mitral valve prolapse. Data obtaine d confirmed the hypothesis of different genesis of ventricular prematu re beats In patients with mitral valve prolapse and with left ventricu lar false tendons. Mitral valve prolapse determined diurnal distributi on of ventricular extrasystoles when both arrhythmogenic factors were present.