[Myocardial contractile capacity of the right ventricle in lesser circulation hypertension and in right ventricular insufficiency].

The informative value of some indices of myocardial contractility, calculated from curves of pressure in the right ventricle and pulmonary artery, was determined in 119 patients suffering from mitral heart disease with various grades of pulmonary hypertension in 25 patients who did not have a heart disease. The dependence of these indices on the grade of pulmonary hypertension and severity of the clinical symptoms of right-ventricular insufficiency was also studied. The Siegel-Sonnenblick contractility index proved to be the most informative index of myocardial contractile function. It was reduced in patients with right-ventricular insufficiency. With an increase in pulmonary hypertension, the average rate of increase in intraventricular pressure in the phase of isovolumic contraction grows sharply, which indicates to considerable hyperfunction of the right ventricle.