[M-echocardiographic determination of left-ventricular diastolic noncompliance, diastolic wall stress and the rate of relaxation of the circumferential muscle fibers].

New noninvasive contemporary indices for assessment of left ventricular diastolic function are presented. They can be obtained by the simultaneous recording of the M-echocardiographic left ventricular dimensions and the apexcardiogram. These indices are: left ventricular diastolic compliance, left ventricular wall stress and the velocity of the circumferential fibre shortening. These indices are statistically significantly changed to a greater extent in hypertrophic cardiomyopathies and to a lesser extent in ischemic heart disease and arterial hypertension and after nifedipin treatment they improve considerably. The left ventricular diastolic wall stress was studied in both types of left ventricular load: by volumetric load a twofold increased stress of the wall was registered while by tension load the stress of the wall was almost normal.