速度向量成像技术对左室舒张功能的评价

The Evaluation of Left Ventricular Diastolic Function by Velocity Vector Imaging

目的:探讨速度向量成像(VVI)技术评价左室舒张功能的可行性。方法:依据二尖瓣口舒张早期(E)、晚期(A)血流频谱比值E/A<1及二尖瓣环前壁、下壁、侧壁、间隔4个位点的舒张早期(Ea)、晚期(Aa)组织多普勒频谱比值Ea/Aa<1选取左室舒张功能减低患者61例(患者组),同时依据1<E/A<2及Ea/Aa>1选取40例健康成人(对照组),应用VVI技术测量2组二尖瓣环前壁、下壁、侧壁、间隔4个位点的舒张早期(Ve)、晚期(Va)运动速度,舒张早期(SRe)、晚期(SRa)应变率,并计算速度比值(Ve/Va)及应变率比值(SRe/SRa)。结果:与对照组相比,患者组二尖瓣环各位点Ve、Ve/Va、SRe、SRe/SRa降低(P<0.01),Va、SRa增高(P<0.01)。结论:速度向量成像技术可用于二尖瓣环运动的定量分析,可作为评价左室舒张功能的一种新方法。

Objective： To explore the feasibility of velocity vector imaging （VVI） in evaluation of left ventricular diastolic function. Methods： Sixty-one patients with diastolic dysfunction were choosen as patient group according to the ratio of mitral valve early （E） and late （A） diastolic flow velocity E/A1 and the ratio of 4 mitral annular sites （anterior, inferior, lateral and septal） early （Ea） and late （Aa） diastolic motion velocity Ea /Aa1 by tissue Doppler imaging. In the same time, 40 healthy adults with 1E/A2 and Ea/Aa 1 were selected as the control group. The values of early （Ve） and late （Va） diastolic motion velocity, the early （SRe） and late （SRa） diastolic strain rate of 4 mitral annular sites （anterior, inferior, lateral and septal） were measured by VVI. The ratios of velocity （Ve/Va） and strain rate （SRe/SRa） were calculated. Results： Compared with the control group, the values of Ve, Ve/Va, SRe, SRe/SRa were significantly decreased （P 0.01）,and the values of Va and SRa were significantly increased （P 0.01） in every mitral annular site of the patient group. Conclusion： The motion of mitral annular could be measured quantitily by VVI, which could be used to evaluate the left ventricular diastolic function as a new method.