速度向量成像技术评价急性心肌梗死患者左心室不同步运动的临床研究

目的 应用速度向量成像(VVI)技术评价急性心肌梗死(AMI)患者心脏不同步运动.方法 选择AMI患者60例和健康志愿者40例,采用VVI技术测量并比较两组间左室局部心肌纵向收缩速度达峰时间(TL-V)、左室局部心肌径向收缩速度达峰时间(T R-V)、左室最早与最迟速度达峰时间的差值(Ts max-min)、左室16节段速度达峰时间标准差(Ts-SD)的差异.结果 ①AMI组梗死节段与非梗死节段心肌TL-V、TR-V分别大于对照组正常节段(P＜0.05);②AMI组纵向及径向Ts max-min、Ts-SD均大于对照组(P＜0.001);③AMI组梗死节段心肌Ts从心功能Ⅰ级至Ⅳ级依次延长(P＜0.001).结论 VVI技术为评价AMI患者心肌不同步运动及判断梗死节段提供了一种新的方法.

Abstract：

Objective To assess the left ventricular contraction asynchrony in patients with acute myocardial infarction(AMI) by velocity vector imaging(VVI).Methods Sixty AMI patients and 40 healthy volunteers were included.Using VVI,the time to peak longitudinal systolic velocity (TL-V) was measured in the left ventricular long axis views,the time to peak radial systolic velocity (TR-V) was measured in parasternal short axis views.The deviation of the earliest and the latest TL-V and TR-V (Ts max-min) was measured,and the standard deviation of TL-V and TR-V (TS-SD) was also measured.Results ①TL-V ,TR-V of the infarcted and non-infarcted segments in patients with acute myocardial infarction were longer than those of the normal segments (P ＜0.05).②The longitudinal Tsmax-min,Ts-SD and the radial Tsmax-min,Ts-SD in infarcted patients were increased compared with the healthy volunteers (P ＜0.001).③Ts of the infarcted segments was increased in turn from the class Ⅰ to class Ⅳ of the cardiac function (P ＜0.001).Conclusions VVI could be used to assess the left ventricular contraction asynchrony in patients with AMI.VVI is a new useful method to determine the infarcted segments.

Assessment of left ventricular contraction asynchrony in patients with acute myocardial infarction using velocity vector imaging

Objective To assess the left ventricular contraction asynchrony in patients with acute myocardial infarction(AMI) by velocity vector imaging(VVI).Methods Sixty AMI patients and 40 healthy volunteers were included.Using VVI,the time to peak longitudinal systolic velocity (TL-V) was measured in the left ventricular long axis views,the time to peak radial systolic velocity (TR-V) was measured in parasternal short axis views.The deviation of the earliest and the latest TL-V and TR-V (Ts max-min) was measured,and the standard deviation of TL-V and TR-V (TS-SD) was also measured.Results ①TL-V ,TR-V of the infarcted and non-infarcted segments in patients with acute myocardial infarction were longer than those of the normal segments (P ＜0.05).②The longitudinal Tsmax-min,Ts-SD and the radial Tsmax-min,Ts-SD in infarcted patients were increased compared with the healthy volunteers (P ＜0.001).③Ts of the infarcted segments was increased in turn from the class Ⅰ to class Ⅳ of the cardiac function (P ＜0.001).Conclusions VVI could be used to assess the left ventricular contraction asynchrony in patients with AMI.VVI is a new useful method to determine the infarcted segments.