Objectives: To observe the changes on heart structure and function with echocardiogram and pulsed wave Doppler tissue imaging ( PW-DTI) in acute myocardial infarction (AMI) patients.

• 目的：应用心脏超声及脉冲组织多普勒成像(PW-DTI)技术定量观察急性心肌梗死患者梗死初期及随访期中心脏结构及功能的改变。