[Hemodynamic aspects in the evaluation of heart function using systolic time intervals]

Not invasively determined systolic time intervals give references to the left-ventricular function. Restrictions result from the fact that the systolic time intervals are differently influenced by haemodynamic factors. The inotropic state, the pre and after load, the stroke volume, the frequency as well as the sympathoadrenal system have an effect on the systolic time intervals. In addition to this come specific changes of the haemodynamics by valvular lesions and by pharmaca effective on heart and circulation. In as far about established systolic time intervals clinically usable data concerning the disturbed left-ventricular pumping function may be received, was reported on. On principle with certain restrictions a usable separation of groups between normal and disturbed cardiac function is possible. The judgment of the individual case is restricted due to considerable disperions of individual values. Also by an improved measuring technique as well as by tolerance tests the evidence could not convincingly be improved. On the other hand, with the help of the index of isometric contraction after Rentsch (preejection period in the erect position divided by preejection period in lying position) a separation into normal and beginning left ventricular dysfunction is possible in a well reproducible way.