速度向量成像技术评价心肌梗死节段室壁径向收缩能力的价值

Evaluation of radial systolic function of left ventricular with myocardial infarction by velocity vector imaging

目的探讨速度向量成像（VVI）技术评价心肌梗死节段径向收缩能力的价值。方法将雄性Wister大鼠分为两组，一组结扎冠状动脉制成心肌梗死模型组（10只），另一组同样进行手术但不结扎冠状动脉作为对照组（14只）。应用VVI技术对左室短轴乳头肌水平室壁径向应变及应变率进行分析。结果心肌梗死组梗死节段（左室前壁及前间隔）径向应变及应变率较对照组相应节段明显减低，两组问差异具有统计学意义（P〈0．05）。对照组各节段室壁应变及应变率比较差异无统计学意义（P〉0．05）。结论VVI技术能够定量评价心肌梗死节段室壁的径向收缩能力。

Objective To explore the value of velocity vector imaging （VVI） in evaluating radial systolic function of left ventricular with myocardial infarction（MI）. Methods Twenty-four male Wister rats were divided into MI group（ n = 10） and control group（ n = 14）. Left main coronary artery of MI group were ligated,and the similar operation were performed in control group without coronary artery ligation. VVI was used to analyse the radial strain and strain rate of regional left ventricule in rats. Results Compared with control group, the radial strain and strain rate of infarcted segments （anterior wall and anterior septal） were decreased significantly（ P 〈0. 05） in MI group. No sigificant difference（ P 〉0. 05） was found when compared radial strain and strain rate in different left ventricle segments in control group. Conclusions VVI can be used as a quantitive tool in evaluating the radial systolic function of left ventricular with MI.