Results of myocardial scintigraphy in 103 individuals are reported. This test method was introduced by the authors in 1973; 131Cs chloride served the purpose of tracer. Beside a group of 17 control individuals, 63 patients with myocardial infarction, 9 with myocardiosclerosis, and 14 with other affections were tested. The normal scintigram in full-face, profile, and left half-profile positions of the patient is first described, then the typical picture of these same positions in infarctions with anterior and posterior localizations, and also in myocardiosclerosis of various origin. The valuableness of the new radioisotope test method has been duly stressed. It affords direct and precise information about the localization and the extensiveness of the morbid process which has led to cicatricial alterations in the heart muscle.