超声斑点追踪技术评价正常人及心肌梗死患者左室短轴室壁运动二维应变的价值

目的:运用斑点追踪技术(STI)测量正常人及心肌梗死患者左心室短轴各节段的二维应变值,观察正常人室壁二维应变的规律,探讨斑点追踪技术对节段性心肌缺血的临床应用价值。方法:对35例正常人及35例心肌梗死患者行超声心动图检查,记录左室短轴观3个水平的高帧频图像,应用二维应变分析软件测量各节段的径向(Rs)、圆周应变值(Cs)及旋转角度(Rot)。结果:正常组Rs在同一水平各节段间差异无统计学意义,乳头肌水平显著高于心尖水平(P<0.05);Cs和Rot在同一水平不同节段间差异有统计学意义(P<0.05)。心肌梗死组梗死节段的Rs和Cs显著低于正常组相应节段(均为P<0.01),Rot在某些节段有显著性降低(P<0.05)。结论:STI能够准确测量左室短轴各节段的二维应变值、敏感评价心肌缺血程度;Rot指标不如Rs和Cs敏感,可作为辅助评价指标。

Measurements of Two-Dimensional Strain in Healthy Subjects and Patients with Myocardial Infarction by Speckle Tracking Echocardiography

Objective: To observe the two-dimensional strain of the left ventricular segments at left ventricular short-axis view in healthy subjects,and to evaluate the clinical value of speckle tracking echocardiography(STI) in patients with myocardial infarction.Methods: Thirty-five patients with myocardial infarction and 35 healthy subjects underwent echocardiography.High frame rate images were recorded at the left ventricular short-axis view and the radial strain(Rs),circumferential strain(Cs),and rotation angle(R...