1Department of Internal Medicine, Otemae Hospital, 2The Cardiovascular Division, Sakurabashi Watanabe Hospital, 3The Second Department of Internal Medicine, Kagawa University School of Medicine, 4The First Department of Internal Medicine, Osaka University School of Medicine
Two-dimensional echocardiograms along the short axis at the level of chordae tendineae (CT) and papillary muscle (PM) of left ventricle (LV) were serially obtained (on the first, 3rd, 7th, 14th and 28th day) in 24 patients with acute myocardial infarction (AMI). Length of akinesis (LOA), circumferential length (Lcf),percent non contractile segment (%NCS) and percent shortening were measured. LOA and %NCS were larger at the level of PM than at the level of CT in 13 patients with anterior MI. On the other hand, both of them were smaller at the level of PM than at the level of CT in 11 patients with inferior MI. Both LOA and %NCS measured on the third day were maximum and well correlated with peak CPK activity. Lcf at enddiastole (Lcfd) did not increase during the first three days, but markedly increased in the first week and further increased gradually until the fourth week. The percent shortening reduced on the third day, but gradually increased after the first week. We concluded that two dimensional echocardiography was a useful method in evaluating LV wall motion, LV function and infarct size at acute phase of MI.