中文摘要：

目的：观察左室型单心室径向运动情况,评价速度向量成像技术（velocity vector imaging,VVI）估测左室型单心室患儿心室径向收缩功能的价值。方法：左室型单心室患儿21例（单心室组）及正常儿童21例（对照组）为研究对象,应用VVI技术对主心腔短轴乳头肌水平室壁径向应变及应变率进行分析。结果：单心室组各节段的径向应变及应变率较对照组相应节段明显减低,两组间差异具有统计学意义（P〈0.05）。对照组乳头肌水平径向收缩。期峰值应变及应变率差异无统计学意义（P〉0.05）。结论：左室型单心室患儿存在径向收缩功能不全,VVI技术能定量评价左室型单心室节段室壁的径向收缩能力。

英文摘要：

Objective：To investigate the radial systolic function of children with single-left ventricle（LV）,and to appraise the clinical value of velocity vector imaging（VVI） on assessing it.Methods：The study group consisted of 21 patients with single-LV.The control group consisited of 21 age-matched normal children.VVI was used to analyse the radial strain and strain rate of regional single-LV at the level of papillary muscle.Results：Single-LV radial strain values were significantly lower in all segments compared with values in control（P0.05）.In normal patients,radial strain and strain rate of papillary muscle level showed no significantly difference（P0.05）.Conclusion：Radial systolic ventricular function is impaired in children with single-LV.VVI can be used as a quantitative tool in evaluating the radial systolic function of single-LV.