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目的:运用速度向量成像(VVI)技术评价心肌梗死患者左心室壁节段心肌运动的同步性。方法:对15例正常人和8例心肌梗死患者进行VVI,测量左心室局部心肌纵向运动达峰时间(TL-V)及径向运动达峰时间(TR-V),计算纵向、径向运动达峰时间差(T-SD)及最早与最迟达峰时间标准差(T-MX)。结果:①正常心脏各节段间TL-V及TR-V差异无统计学意义。②心肌梗死节段TL-V、TR-V较非梗死节段及对照组显著延长(P<0.05);与对照组比较,心肌梗死组纵向运动T-SD和T-MX、径向运动T-SD和T-MX均显著增大(均P<0.05)。结论:VVI技术有望成为评价心肌梗死患者左心室壁非同步性运动及判断梗死节段的有效方法。
OBJECTIVE: To evaluate the synchrony of left ventricular wall segment myocardial motion in patients with myocardial infarction using velocity vector imaging (VVI). Methods: VVI was performed in 15 normal subjects and 8 patients with myocardial infarction. TL-V and TR-V of left ventricular myocardium were measured to calculate longitudinal and radial motion Peak time difference (T-SD) and the earliest and latest peak time standard deviation (T-MX). Results: ① There was no significant difference in TL-V and TR-V among the segments of normal heart. Myocardial infarction segment TL-V, TR-V than the non-infarction segment and the control group was significantly longer (P <0.05); compared with the control group, longitudinal myocardial T-SD and T-MX, radial motion T Both SD and T-MX increased significantly (all P <0.05). Conclusion: The VVI technique is expected to be an effective method to evaluate the left ventricular wall motion and determine the infarct size in patients with myocardial infarction.