[Determination of the systolic time interval in normal subjects from electrokymographic studies of vessels near the heart].

By means of electrokymography curves of the motion of the vascular margin of the large vessels near the heart, aorta and pulmonary artery, may be recorded noninvasively. Since these curves of motion widely correspond to the central curves of the arterial pulse it is possible to state systolic time intervals separately for the right and left heart. Analogically to the presphygmic index after Rentsch with global evidence on the left-ventricular function of the heart these are possible for the outflow way of the right ventricle, also by formation of the quotient of the electrokymographically established STI. Comparisons between right-ventricular and left-ventricular STI and relations to the at the same time electrokymographically stated dynamic parameters of the heart wall are the result. In the present paper on the basis of electrokymographical investigations on 24 test persons with healthy heart the concerning the contents reasonable STI with relatively slight statistical distribution and their quotient are determined as starting-point to further investigations.