Objective:To observe spontaneous functional improvement of dyssynergic segments in patients with acute myocardial infarction (AMI),and to evaluate the predicting value of low dose dobutamine (Dob) echocardiogrphy for the improvement.

• 观察急性心肌梗塞运动异常节段功能的自发性改善 ,评价小剂量多巴酚丁胺 (Dob)二维超声心动图 (2 DE)试验的预测价值和安全性。