应用二维斑点追踪显像技术比较左束支传导阻滞与右束支传导阻滞患者的心室收缩同步性

Comparison of ventricular systolic synchrony in patients with left bundle branch block and right bundle branch block by two-dimensional speckle tracking imaging

目的:探讨完全性左束支传导阻滞(CLBBB)及完全性右束支传导阻滞(CRBBB)患者的左心室内收缩同步性。方法:收治孤立性CLBBB患者20例,孤立性CRBBB患者20例和健康成年人20例,分别计算出左心室各节段应变达峰时间标准差。结果:与正常组比较,CRBBB组纵向、径向应变达峰时间标准差增加(P<0.05);与正常组和CRBBB组比较,CLBBB组纵向、径向应变及圆周应变达峰时间标准差明显增加(P<0.001)。结论:CRBBB患者左心室内同步性轻度受损,而CLBBB患者左心室内明显不同步。CLBBB较CRBBB左心室内收缩不同步性更显著。

Objective：To investigate the left ventricular systolic synchrony in patients with complete left bundle branch block and complete right bundle branch block.Methods：20 patients with isolated CLBBB,20 patients with isolated CRBBB and 20 healthy adults were enrolled in this study.The standard deviation of strain peak time in each segment of the left ventricle was calculated.Results：Compared with the normal group,the longitudinal radial strain and the standard deviation of the peak time in the CRBBB group increased（P〈0.05）;compared with the normal group and the CRBBB group,the CLBBB group of longitudinal and radial strain and circumferential strain,and the standard deviation of the peak time increased significantly（P〈0.001）.Conclusion：Left ventricular synchrony is slightly impaired in CRBBB patients,while the left ventricular dyssynchrony is obvious in CLBBB patients.The dyssynchrony of CLBBB was more significant than that of CRBBB.