In a consecutive series of 234 patients admitted for selective coronary arteriography, 49 had had definite acute myocardial infarction (AMI) three months to ten years previously. More than 75% stenosis in at least one of the major coronary arteries was found in 80% of the patients. Two and three-vessel disease was demonstrated in 31% of the patients, which differs significantly from the 75-80% reported in autopsy studies in patients dying from AMI. At ventriculography all 22 patients with pathological Q waves had dyssynergy of the left ventricle.