Effects Of Viable Myocardium On Left Ventricular Remolding And Systolic Function After Myocardial Infarction

Parti Evalution of viable myocardium with low-dose dobutamine echocardiography in patients with acute myocardial infarctionObjective To detect the viable myocardium in infracted areas at two time points, respectively. To investigate the time course needed for the functional recovery of viable myocardium after revascularization.Methods 48 patients accept rest echocardiography and low-dose dobutamine echocardiography before revescularization at day 20 ?12 after myocardium infarction,which had follow-up at month 2.6 ?0.9 and month 5.4 ?1.6 after revascularization. Semi-quantitative analysis was applied in echocardiography and low-dose dobutamine stress echocardiography.Stress echocardiography was defined as positive when > 1 contiguous regional wall motion abnormalities were improved during dobutamine infiision. The same criterion was used for regional wall motion abnormality improvement after revascularization.Results The positive low-dose dobutamine echocardiography wall motion areas indicated the high possibility of viablemyocardium existence and it gradually increased with the prolonged follow-up. The Accuracy is 81.9% early compaired with 85.8% later.Conclusion Low-dose dobutamine echocardiography is a valuable test to detect the viable myocardium in myocardium infarction areas.It takes a longer time for some viable myocardium to recover from their severe loss.