组织多普勒测量二尖瓣环下行速度评价左室收缩功能

目的：用组织多普勒显像技术测量二尖瓣环下行速度评价左室收缩功能。方法：该研究对５０例正常人和进行门控心血池造影后３小时的３０例心肌梗塞患者的收缩期二尖瓣环下行速度进行测量，分别在心尖四腔切面和二腔切面上测量二尖瓣环间隔处（ＭＡＶ－Ｓ）、侧壁处（ＭＡＶ－Ｌ）、前壁处（ＭＡＶ－Ａ）、后壁处（ＭＡＶ－Ｐ）的各点处的速度值，并计算各点均值（ＭＡＶ－Ｍ）。结果：１．心梗患者各点的速度及均值均较正常对照组明显下降，且发现不同部位心梗，其二尖瓣环各点速度下降程度不同；２．将全部受检者的ＭＡＶ－Ｍ与２ＤＥ所测得的ＥＦ进行相关分析，也存在明显相关，相关系数０．８９（Ｐ＜０．００１）。此外，将３０例心梗患者的ＭＡＶ－Ｍ与核素测得的ＥＦ进行相关分析，也存在明显相关，相关系数０．８７（Ｐ＜０．００１）。结论：测量二尖瓣环下行速度可作为一个评价左室收缩功能的新指标。

Mitral Annular Descent Velocity for Evaluating Left Ventricular Systolic Function by Doppler Tissue Echocardiography

Objective:To evaluate left ventricular systolic function using mitral annular descent velocity by Doppler Tissue Echocardiography.Methods:30 patients with myocardial infarction(MI)and 50 healthy subjects were involved.Doppler tissue M mode studies were obtained from each of 4 mitral annular sites:Septal(MAV S)and lateral(MAV L)from apical 4 chamber views.anterior(MAV A)and posterior(MAV P)from apical 2 chamber views.The mean value from the above four sites(MAV M)was calculated.Results:All the MI patients decreased mitral annular velocity at all the sites.2.The MAV mean correlated linearly with LV ejection fraction.determined by biplane area length method( r =0 89; P <0 001)in all the studied subjects.Also,in 30 cases of MI the correlation between MAV mean and LV ejection fraction obtained by radionuclide ventriculography was good( r =0 87, P <0 001).Conclusion:the mitral annular descent velocity can be used as a new index to evaluate the LV systolic function in MI.