Detection of the Site and Extent of the Left Ventricular Asynergy in Myocardial Infarction by Echocardiography and B-Scan Imaging

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Abstract
Left ventricular wall motions in 53 patients with myocardial infarction and 14 normal subjects were studied by echocardiography and B-scan imaging (ultrasono-cardiokymography, ultrasono-cardiotomography). In acute myocardial infarction, abnormal motions of left ventricular wall are marked in acute phase and diminished in extent gradually in recovery phase. In some cases, echo-demonstrated segmental dyskinesis did not disappear in recovery phase, possibly due to the presence of irreversible myocardial damage. Echographic thickness of the infarcted wall was less increased than normals or was not increased during systole and decreased when bulged out in some cases, indicating the existence of necrotized muscle. Multiple echoes sometimes seen between endocardial and epicardial echoes of infarcted myocardium presumably displayed the fibrosis of the infarcted myocardium. Abnormal echocardiographic motions of septum and posterior wall were observed in some patients who had no ECG abnormalities which suggest septal or posterior wall involvement. Echocardiography may detect another affected area of the left ventricle which was not detected by ECG.

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