组织同步成像和组织追踪技术评价束支传导阻滞患者心室壁运动的同步性

目的探讨束支传导阻滞患者心室壁机械运动同步状况。方法运用组织同步成像和组织追踪技术,观察7例左束支传导阻滞(LBBB)、15例右束支传导阻滞(RBBB)患者及21例正常人的心肌6个节段的收缩起始时间、收缩达峰时间,计算时间差值和标准差。结果RBBB组的时间差值、标准差及左室侧壁和间隔的时间参数与对照组之间无统计学差异,右室壁的收缩起始及达峰时间晚于自身左室壁及室间隔,且与对照组的右室壁有统计学差异。LBBB者心肌各节段的收缩起始时间、时间差值、标准差与对照组和RBBB之间有统计学差异。结论LBBB者心肌运动不同步明显,组织同步成像和组织追踪技术能敏感检测到心室激动顺序,出现收缩延迟及收缩不同步。

Assessing synchrony in bundle branch block by tissue synchronization imaging and tissue tracking

Objective To assess the synchrony in bundle branch block. Methods To observe synchronization in 7 left bundle branch block (LBBB) patients, 15 right bundle branch block (RBBB) patients and 21 normal subjects by tissue synchronization imaging and tissue tracking, 6 ventricular regional myocardia were assessed. The parameters included the time of systolic onset, the time of peak, the difference and standard deviation. Results There was no significant difference between RBBB and control group in time parameters of lateral and septum, but these differences in right ventricular between RBBB and control group were significant. These differences were also seen between LBBB and control group as well as RBBB. Conclusion There are significant dyssynchrony in LBBB. Tissue synchronization imaging and tissue tracking are very sensitive to time events, and can observe the ventricular activation sequence, delay contraction and asynchronization in LBBB.