速度向量成像评估单心室腔肺分流术后心室收缩同步性

目的 探讨速度向量成像技术（velocity vector imaging,ⅤⅥ）评估单心室腔肺分流术后心肌收缩活动同步性的可行性及准确性.方法 应用Simense Sequoia C512超声仪,通过ⅤⅥ技术对47例单心室术后及年龄匹配的47名正常儿童进行研究.结果 单心室腔肺分流术后任意两心肌节段间速度达峰时间最大差值明显高于正常儿童[（169.87±85.10）ms vs （88.30±29.88）ms,P＜0.01],术后组任意两心肌节段间应变达峰时间最大差值明显高于正常儿童[（211.70±106.06）msvs （82.23±63.44）ms,P＜0.01],术后组收缩期速度达峰时间标准差高于正常儿童[（71.47±35.07） vs （39.72±14.96）,P＜0.01],术后组应变达峰时间标准差高于正常儿童[（87.16±44.48）vs （32.47±23.66）,P ＜0.01].结论 单心室腔肺分流术后患者仍然存在心室收缩活动不同步,ⅤⅥ技术可以比较准确地反映心室收缩同步性.

Assessment of ventricular synchrony in children with single ventricle after cavopulmonary connection using velocity vector imaging

Objective To evaluate the feasibility and accuracy of velocity vector imaging （VVI） in assessing ventricular synchrony in children with single ventricle after cavopulmonary connection. Methods Forty-seven children with single ventricle after cavopulmonary connection were enrolled in this study and 47 age-matched normal children were served as control group. The time to systolic peak velocity and to peak systolic strain measured by VVI were compared. Results Compared with normal children, the maximal temporal differences of the time to peak systolic velocity and to peak systolic strain between any two segments in children with single ventricles after eavopuimonary connection were higher （169.87 ± 85.10） ms vs （88.30±29.88） ms, （211.70±106.06） ms vs （82.23±63.44） ms, P d0.01, respectively~, the standard deviation of the time to peak systolic velocity and to peak systolic strain were higher [（71. 47 ± 35. 07） vs （39. 72 ± 14.96）, （87.16±44.48）vs （32.47±23. 66）, P 〈O. 01, respectively. Conclusion Ventrieular dyssynehrony was ob- served in children with single ventricle after cavopulmonary connection, and could be assessed accurately using velocity vector imaging.