超声心动图曲线M型应变率成像研究冠心病心肌缺血

目的应用曲线M型应变率成像（CMM-SRI）技术研究冠心病缺血心肌的图像特点，重点探讨收缩-舒张转换时间（Tcec）的改变。方法冠心病组和正常对照组各60例，观察左心室CMM-SRI图像特点，定量检测各节段Tcec，冠状动脉造影确定缺血节段，比较冠心病组左心室壁各节段与对照组之间Tcec的差异。结果无缺血节段的室壁，CMM-SRI图像红、蓝颜色转换的交界线基本呈直线，有缺血节段的室壁，交界线呈不规则曲线；缺血节段Tcec延长，与对照组比较绝大多数缺血节段差异有统计学意义。结论CMM-SRI可定量分析缺血心肌Tcec的改变，提示CMM-SRI技术可用于检测缺血心肌。

Study on myocardial ischemia in coronary heart disease by echocardiographic curved M-mode strain rate imaging

Objective To study the characteristics of echocardiographic curved M-mode strain rate imaging(CMM-SRI)on ischemic myocardium in coronary heart disease,especially the change of time to compression/expansion crossover(Tcec).Methods Sixty patients with coronary heart disease and sixty healthy subjects(controls)were examined.The CMM-SRI characteristics of left ventricle and Tcec were observed and detected quantitatively.Coronary artery visualization was used to differentiate myocardium segments of patients into ischemic and non-ischemic ones.In the quantitative analysis system of curved M-mode of strain rate imaging Tcec was compared between myocardium segments of patients and those of healthy subjects.Results The borderlines of red/blue crossover of CMM-SRI were almost straight in non-ischemic ventricular walls while irregularly curve in ischemic ventricular walls.Most of ischemic myocardium segments had significantly longer Tcec than myocardial segments in healthy subjects.Conclusion The CMM-SRI can quantitatively analyze the change of Tcec and can be used in detecting ischemic myocardium segments.