1National Cardiovascular Center, Hospital, 2National Cardiovascular Center, Hospital, 3National Cardiovascular Center, Research Institute, 4The Second Department of Internal Medicine, Hiroshima University, School of Medicine
Clinical significance of the so-called drifting dregs-like echoes in the left ventricle was investigated prospectively in 57 cases of myocardial infarction with asynergy in the left ventricular anterior wall and 11 cases of dilated cardiomyopathy, and we concluded as follows: (1) In the ultrasonic equipment, the optimal gain was higher by 10-20 dB for visualizing the drifting dregs-like echoes than for usual imaging the intracardiac structures. (2) The common conditions necessary for the appearance of the drifting dregs-like echoes were left ventricular dilatation (diastolic volume index ≥ 120 ml/m2) and left ventricular dysfunction (ejection fraction ≤ 35%). (3) The presence of left ventricular aneurysm was not necessary for the genesis of the drifting dregs-like echoes. (4) There was no direct relationship between the appearance of the drifting dregs-like echoes and the left ventricular thrombi formation. The blood flow stagnation was assumed to be a common underlying factor. We should perform a further study on the production of these intracardiac echoes.