组织多普勒技术定量评价陈旧性室间隔心肌梗死的右室功能

目的:采用不同组织多普勒技术定量研究陈旧性室间隔心肌梗死患者的右室局部和整体功能。方法:20例陈旧性室间隔心肌梗死患者,30例健康成人。采用应变率及组织速度成像获取右室侧壁各节段的组织速度、位移、应变及应变率曲线。测量收缩功能参数:收缩期峰值速度(Vs)、最大位移(D)、收缩期峰值应变(S)及应变率(SR);测量舒张功能参数:舒张早期充盈速度(Ve)、心房收缩期充盈速度(Va)、舒张早期充盈应变率(Esr)、心房收缩期充盈应变率(Asr)。脉冲组织多普勒获取三尖瓣环运动频谱曲线,计算右室Tei指数。结果:陈旧性室间隔心肌梗死组右室侧壁基底段的S和D以及心尖段的SR和D均较正常组明显减低;基底段及中间段的Ve和Esr均较正常组明显减低;右室Tei指数明显高于正常组。结论:陈旧性室间隔心肌梗死患者右室侧壁多个节段的局部收缩和舒张功能明显受损,此外右室整体功能也明显受损。

Right ventricular regional and global function in patients with old septal myocardial infarction by different techniques of tissue Doppler imaging

Objective:To evaluate right ventricular(RV) regional and global function in patients with old septal myocardial infarction by different techniques of tissue Doppler imaging.Methods:The curves of RV lateral wall myocardial Doppler velocity,displacement,strain and strain rate were acquired by strain rate and tissue velocity imaging in 20 patients with old septal myocardial infarction and 30 healthy volunteers.Measured systolic function parameters were as fo llows:the peak systolic velocity(Vs),displacement(D),strain(S) and strain rate(SR).Measured diastolic function parameters were listed below:the early diastolic velocity(Ve),atrial systolic velocity(Va),early diastolic strain rate(Esr),atrial systolic strain rate(Asr).Pulsed tissue Doppler sample volume was placed in tricuspid annulus and RV Tei index was calculated.Results:In old septal myocardial infarction groups,the S and D in basal segment and the SR and D in apical segment of RV lateral wall were decreased,the Ve and Esr in basal and mid segments of RV lateral wall were decreased than that of normal group.RV Tei index was higher than those of normal group.Conclusion:Regional function of multiple RV lateral wall segments in patients with old septal myocardial infarction has dysfunction.In addition,global RV function also has dysfunction.