目的利用M型超声测定二尖瓣环运动（MAM ）评价左室舒张功能。
Objective To define the role of mitral annulus motion (MAM) for detecting diastolic function in patients with old myocardial infarction.
以TDI方法测定二尖瓣环运动频谱评价心力衰竭儿童左室功能是敏感和可靠的。
Mitral annulus velocity detected by TDI is sensitive and reliable to evaluate left ventricular function in heart failure children.
结论QTVI测量二尖瓣环运动速度能无创、有效地评价心脏双腔起搏左室收缩和舒张功能。
Conclusion Measuring the motion velocities of mitral annulars by QTVI can be used to assess global left ventricular systolic and diastolic function in Dual-chamber Pacing .
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