Right ventricular systolic sub-periods. Normal values

Right ventricular systolic sub-periods were examined in the group of 18 healthy subjects, basing on simultaneous electrocardiographic, phonocardiographic and pulmonary artery pressure tracings. The values established were compared with corresponding left ventricular systolic periods and correlated with selected hemodynamic parameters. Following mean values of the right ventricular systolic sub-periods were found: Q -- 1. sound interval = 0.051 sec., systolic time = 0.404 sec., ejection period = 0.319 sec., pre-ejection period = 0.085 sec., and isovolumetric contraction time = 0.034 sec. Both the right ventricular systolic and ejection periods were significantly longer than the corresponding left ventricular systolic ones. The ratio: right ventricular pre-ejection period to ejection period was lower than that calculated for the left ventricle. Both the right ventricular systolic and ejection periods negatively correlated with heart rate, whereas the ratio: right ventricular isovolumetric contraction time to ejection period depended on pulmonary artery pressure, pulmonary resistance and right ventricular work index.