摘要目的 探讨速度向量成像(velocity vector imaging,VVI)评估单心室腔肺分流术后患者心肌节段心功能的可行性及准确性.方法 30例单心室腔肺分流术后患者及年龄匹配的30例正常儿童为研究对象,应用VVI技术测量单心室腔各心肌节段的收缩期峰值速度、位移、应变、应变率,并与根据房室瓣反流测得的单心室峰值压力变化率(dp/dt)进行对比分析.结果 单心室腔肺分流术后患者所有心肌节段的收缩期峰值应变及应变率均低于正常儿童(P＜0.05).单心室腔肺分流术后患者单心室腔的dp/dt为(512.60±154.52)mm Hg/s,与残腔侧基底段峰值应变率相关性最好(r=0.72,P＜0.01).结论 单心室腔肺分流术后患者存在一定程度的节段收缩功能低下,VVI技术可以较准确地反映单心室腔肺分流术后患者的节段心功能变化.

abstractsObjective To evaluate the feasibility and accuracy of velocity vector imaging (VVI) in assessing ventricular function in children with single ventricle after cavopulmonary connection.Methods Thirty children with single ventricle after cavopulmonary connection were enrolled in this study,30 agematched normal children were served as control group.The systolic peak velocity,displacement,strain and strain rate in this two groups measured in 6 segments by VVI were compared.dp/dt of single ventricle was estimated by atrioventricular regurgitation using simplified Bernoulli equation.Results Strain and strain rate were significantly lower in all 6 segments in children with single ventricle after cavopulmonary connection compared with values in normal children( P ＜0.05,respectively),strain rate of the basal segment at the rudimentary chamber correlated best with dp/dt (r =0.72,P ＜0.01).Conclusions Segmental ventricular dysfunction was observed in children with single ventricle after cavopulmonary connection,and could be assessed accurately using velocity vector imaging.