The results of urgent coronarography and ventriculography in 95 patients with pre-infarction state and acute myocardial infarction are analyzed. It is established that from the beginning of the acute anginal attack till the end of coronarography 13 h 40 min (average) have elapsed. In 13 patients angiographically normal coronaries have been found, 2 of them had myocardial infarction. It is recorded that in patients with pre-infarction state and acute myocardial infarction the affection of the coronaries is more severe than in those with stable angina pectoris. Coronary vessels fit for revascularization of the myocardium were found in 71.4% of patients. Disorders of contractility of the left ventricle were seen in 81.6% of cases.