The hemodynamic prognosis of myocardial infarction is determined, at medium and long term, by the function of the left ventricle. This is related to the infarct size, the dilatation and geometry of the ventricle secondary to left ventricular remodeling which often follows infarction. In addition to clinical criteria, the hemodynamic parameters which are essential for patient evaluation are the ejection fraction (by radionuclide or conventional ventriculography), rapidly progressive ventricular dilatation (by repeated echocardiography) and circulatory reserve from the exercise stress test data.