双多普勒组织成像技术同步评价室间隔左右肌带运动特征

摘要

Objective To reveal the potential different longitudinal motion characteristics and differences of left and right muscular band (L-MB,R-MB)of interventricular septum (IVS) during systole and diastole in normal subjects.Methods Dual Doppler tissue imaging was applied for the longitudinal velocity curves of L-MB and R-MB of anterior and posterior interventricular septum(P-IVS,A-IVS) at basal,mid,and apical levels in eighty-two healthy subjects.Peak isovolumetric contraction (VIVC),systolic (Vs),early(Ve) and late (Va) diastolic velocities were measured,and myocardial velocity gradient(MVG)and Ve/Va ratio of each segment of L-MB and R-MB were calculated.Results ①Peak velocity of MB:the VrvC,Vs,Ve and Va of R-MB of both A-IVS and P-IVS were higher than those of L-MB; the VrvC,Vs,Ve and Va were gradually decreased from the base to apex of both A-IVS and P-IVS;the VIVC and Vs of A-IVS were higher than those of P-IVS; the Ve and Va of A-IVS were lower than those of P-IVS.②Correlation and MVG analyses of peak velocity of MB:the systolic and diastolic velocities between L-MB and R-MB of both A-IVS and P-IVS have shown a very strong positive correlation;the isovolumetric systolic MVG1 of L-MBof A-IVS,systolic MVG1 of R-MB of P-IVS and the diastolic MVG1 of both A-IVS and P-IVS were higher than those of MVG2.Conclusions The heterogeneity of longitudinal peak systolic and diastolic velocity and regional myocardial compliance,the consistency of moving direction and positive correlation of longitudinal peak systolic and diastolic velocity between L-MB and R-MB of both A-IVS and P-IVS have been demonstrated in normal subjects.%目的 评价正常成年人室间隔(IVS)左、右侧肌带纵向收缩舒张运动特征及其差异.方法 应用双多普勒组织成像技术获得正常成人前后室间隔左右侧肌带基底段、中间段和心尖段的心肌纵向运动曲线,测量等容收缩期峰值速度(Vwc)、射血期峰值速度(Vs)、舒张早期峰值速度(Ve)及舒张晚期峰值速度(Va),计算双侧肌带速度梯度(MVG)和各节段Ve/Va值.结果 ①肌带峰值速度:前后室间隔右侧肌带VIVC、Vs、Ve、Va大于左侧；前后室间隔双侧肌带VIVC、Vs、Ve、Va由基底向心尖逐渐变小；前室间隔的双侧肌带VIVC、Vs大于后室间隔,前室间隔的双侧肌带Ve、Va小于后室间隔；②肌带峰值速度相关性及相应梯度分析:前后室间隔双侧肌带的整体及节段收缩及舒张峰值速度均呈正相关；前后室间隔收缩及舒张期中间段-心尖段MVG大于基底段-中间段MVG.结论 正常成年人心脏室间隔左右侧肌带心肌纵向舒缩运动具有峰值速度及局部心肌顺应性分布不均质、运动方向一致性和速度大小正相关性的特征.