速度向量成像评价肥厚型心肌病左室心肌舒张顺序

目的：应用组织向量成像技术定量评价肥厚型心肌病左心室心肌舒张顺序。方法：选择16例健康志愿者及临床确诊肥厚型心肌病患者15例，应用超声诊断仪，在VVI模式下，评价心内膜及心外膜的舒张顺序。结果：肥厚型心肌病组心内膜及心外膜左室各节段纵向应变明显低于对照组（P〈0.01）。肥厚型心肌病组心内膜峰值应变的达峰时间等于或早于心外膜。达峰时间的差值与正常组有统计学差异。结论：速度向量技术能够定量评价左心室心肌心内膜及心外膜心肌机械做功和舒张运动的顺序，为早期发现舒张功能异常提供了有力的工具。

To evaluate the sequence of left ventrieular diastolic function of hypertrophic cardiomyopathy by velocity vector imaging

Objective:To evaluate left ventricular diastolic function by velocity vector imaging(VVI)in patients with hypertrophic cardiomyopathy.Methods:16 cases as control group,15 cases with HCM as study group.The longitudinal time to peak strain and peak strain of each segment were measured.Results:Left ventricular longitudinal max negative strain in HCM group decreased compared to the healthy group(P<0.01).In both groups strain was higher in endocardium than epicardium(P<0.01).The sequence of time to peak strain in two groups was different(P<0.05).Conclusion:VVI can quantificationally evaluate left ventricular activity sequence,it maybe an useful method which can quantitatively assess left ventricular diastolic function.