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目的 应用定量组织速度成像 (QTVI)分析正常人及心肌梗死患者左室心肌收缩运动特征 ,探求评价心肌收缩功能的合理量化指标。方法 应用QTVI离线分析 10例前壁心梗病人及 2 0例正常对照者左室各节段长轴方向的心肌多普勒速度曲线 ,计算平均峰值收缩速度 (Vs)、收缩加速度 (a)、长轴收缩速度增加率 (Rvi)等反映收缩功能的参数。结果 正常人左室长轴a由基底段到心尖逐渐减低 ,心肌梗死时这一规律丧失 ,梗死区a显著减小 ;包含梗死区的室壁Rvi与非梗死区及正常人相应室壁Rvi对比显著增大或减小。结论 ①QTVI可全定量同步对比分析多室壁节段的运动。②a可直观反映心肌收缩性。③Rvi可作为反映左室长轴收缩功能的量化指标
Objective To analyze the characteristics of left ventricular systolic and contractile movement in patients with normal and myocardial infarction by quantitative tissue velocity imaging (QTVI), and to explore reasonable quantitative indicators for evaluating myocardial systolic function. Methods The myocardial Doppler velocities in the long axis of 10 segments of anterior wall myocardial infarction patients and 20 normal controls were analyzed by QTVI. Mean peak systolic velocity (Vs), systolic acceleration (a) and mean systolic velocity Long axis systolic velocity increase rate (Rvi) and other parameters that reflect systolic function. Results The long axis a of the left ventricle of normal people gradually decreased from the basal segment to the apex of the heart, and this pattern was lost during myocardial infarction. The infarct area a was significantly reduced. Compared with the corresponding wall Rvi of the non-infarcted area and the non-infarcted area Significantly increase or decrease. Conclusions ① QTVI can be used for quantitative and simultaneous analysis of multi-wall segment motion. ② a can directly reflect the myocardial contractility. ③ Rvi can be used as a quantitative indicator of left ventricular long axis systolic function