[Modifications of the left ventricular function as the result of severe and chronic reduction of the preload].

In order to evaluate the effect which the cronic, severe, and constant decrease of the preload of the left ventricle has on the contractile function of this chamber, 15 cases, with the strict technical conditions and permitted the planned measurements, were taken from 86 studies of ventricular function in patients with tight mitral stenosis. The following parameters were calculated; the ejection fraction, the maximum DP/dt, the zero point diastolic pressure, the final diastolic pressure, the diastolic AP, the mid-diastolic pressure, the diastolic compliance index, and the passive elastic module of the left ventricle, the pulmonary pressure, the cardiac output, systolic output, and the changes produced by the infusion of Isopropilaminoetanol. It was concluded that the effects of cronic and severe pre-load decrease are: 1. Moderate decrease of the cardiac output with low systolic output and high cardiac frequency. 2. Conserved inotropic reserve. 3. Normal ejection fraction. 4. Normal diastolic tension behavior. 5. Increased compliance and special behavior of the passive elastic module.