Objective To evaluate the characteristics of the systolic function and coronary hemodynamics of stunned myocardium during dobutamine(DOB) stress test using transthoracic Doppler echocardiography(CDCFI)and tissue tracking(TT).

• 目的 本研究应用组织追踪技术 (Tissue tracking,TT)与彩色多普勒冠脉血流显像技术 (Color Doppler coronary flowimaging,CDCFI)评价多巴酚丁胺 (DOB)负荷时顿抑心肌的收缩功能及其冠脉血流动力学的特征。