[Index of isometric contraction--a comparison with invasive methods of cardiac function testing in patients with ischemic heart diseases and post-myocardial infarct status].

In 81 patients with an ischaemic heart disease and myocardial infarction the evidence of the presphygmic index PI (non-invasive index) was tested concerning a beginning myocardial functional disturbance and a latent heart insufficiency, respectively, with the help of an invasive cardiopulmonary functional diagnostics which was performed under dosed bicycle ergometer load in the steady state. The presphygmic index PI correlates in significantly positive way with the end-diastolic pressure of the heart and the quotient from minute volume of the heart and the end-diastolic pressure of the pulmonary arteries (VM/PAEDP). The presphygmic index is on the basis of this correlation of the left-ventricular function suitable to establish disturbances of the myocardial functions and to give the possibility of a separation of the patients in cardially sufficient and cardially insufficient ones. Here the evidence of the presphygmic index might be larger concerning the recognition of a latent heart insufficiency than concerning the recognition of beginning myocardial functional disturbances. The presphygmic index apparantly possesses a high degree of sensibility then, when the myocardial functional disturbances coincide with a beginning reduction of the pumping action of the heart.