[Comparative evaluation of the myocardial contractile indices of the left ventricle in ischemic heart disease].

The indices of hemodynamics and myocardial contractility rate (end diastolic and end systolic volumes, ejection fraction, average rate of shortening of circumferential fibres, and average normalized rate of systolic ejection) were studied in 44 patients with ischemic heart disease to appraise the informative value of each parameter and reveal myocardial dysfunction. Calculations were done on an electronic computer system. The data obtained were compared with the findings in practically healthy persons. It was found that increase of the residual volume is the first sign of disturbed myocardial contractility and correlates well with the extent and volume of impaired contractility of the left ventricular segments. A decrease of the ejection fraction is noted only with an increase of the residual volume, the degree of the decrease correlating most closely with the degree of the decrease of the rate indices. The number and localization of the affected segments of the left ventricular wall have an effect on the contractile function of the myocardium.