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目的:应用速度向量成像(velocity vector imaging,VVI)技术评价急性及慢性心肌缺血患者的心肌扭转运动。方法:对24名正常对照者(对照组)、25例慢性心肌缺血患者(心肌缺血组)及25例急性心肌梗死患者(心肌梗死组)进行超声心动图检查,并存储VVI二维动态灰阶图像,脱机分析左心室短轴观中基底部及心尖部各节段的收缩期旋转角度及速度、舒张期旋转速度。结果:①3组受检者的心肌扭转运动方向相同;②心肌梗死组梗死节段收缩期旋转角度及速度、舒张期旋转速度均显著低于对照组;③心肌缺血组部分缺血节段的舒张期旋转速度显著降低,但收缩期旋转角度及速度与对照组相比,差异无统计学意义。结论:应用VVI技术定量分析心肌扭转运动可能有助于检出和鉴别心肌缺血及心肌梗死,为评价局部心肌运动提供更多信息。
Objective: To evaluate myocardial torsion in patients with acute and chronic myocardial ischemia by using velocity vector imaging (VVI) technique. Methods: Echocardiography was performed in 24 normal controls (control group), 25 patients with chronic myocardial ischemia (myocardial ischemia group) and 25 patients with acute myocardial infarction (myocardial infarction group). The VVI 2D dynamic Gray scale images, offline analysis of left ventricular short axis view of the basal and apical systolic rotation angle and velocity, diastolic rotation speed. Results: ①The same direction of myocardial torsion was observed in the three groups; ② The rotation angle and velocity of systole and the rotation speed of diastole of myocardial infarction group were significantly lower than those of the control group; ③In ischemic segment of myocardial ischemia group Diastolic rotational speed was significantly reduced, but systolic rotation angle and velocity compared with the control group, the difference was not statistically significant. Conclusion: The quantitative analysis of myocardial torsion using VVI technique may be helpful to detect and identify myocardial ischemia and myocardial infarction, and provide more information for the evaluation of local myocardial motion.