二维斑点追踪成像联合组织多普勒成像技术评价左束支起搏术后早期室间同步性

目的 采用二维斑点追踪成像联合组织多普勒成像技术对左束支起搏术后早期室间同步性进行评价,比较两种方法评价室间同步性的效果.方法 选取2019年5月—2020年5月于成都市第三人民医院心内科行左束支起搏的患者30例作为病例组,行右室流出道起搏的患者24例作为对照组.术后1个月行经胸超声心动图检查,采集至少三个心动周期的心...

Evaluation of Interventricular Synchrony of Left Bundle Branch Pacing by Two-Dimensional Speckle Tracking Imaging and Tissue Doppler Imaging Technique

Objective To evaluate interventricular synchronization in patients with left bundle branch pacing(LBBP)by two-dimensional speckle trackingimaging(2D-STI)and tissue Doppler imaging(TDI),and compare the outcomes of interventricular synchronization parameters by two methods.Methods 30 patients with LBBP in Department of Cardiology of The Third People’s Hospital of Chengdu from May 2019 to May 2020 were selected as the case group,and 24 patients with right ventricular outflow tract pacing(RVOTP)in the same period were selected as the control group.One month after operation,transthoracic echocardiography was performed,and two-dimensional and TDI images of apical four chamber view for at least three consecutive cardiac cycles were collected.The strain-time curves of left and right ventricular walls were generated by 2D-STI,and the time to peak(Ts)of longitudinal strain of basal segments were recorded.The velocity-time curves of 2 basal segments of left and right ventricular walls were generated by TDI,and Ts of contraction velocity of 2 basal segments were recorded.The absolute value of the differences between Ts of basal segments of right and left ventricular walls was used as the interventricular synchronization parameter.Interventricular synchronization of two pacing modes and outcomes of two methods were compared.Results There was no significant difference in conventional echocardiographic parameters between the two groups(P>0.05).There was significant difference in ventricular synchronization parameters between the two groups by 2D-STI(P<0.05),and there was no significant difference in ventricular synchronization parameters by TDI(P>0.05).There was a positive correlation between the ventricular synchronization parameters of the two methods(correlation coefficient 0.392,P<0.05).There was significant difference in the positive rate of ventricular synchrony between the two methods in the LBBP group(P<0.05),but there was no significant difference in the positive rate of ventricular synchrony between the two methods in the RVOTP group(P>0.05).Conclusion The interventricular synchronization of LBBP is better than RVOTP in the early postoperative period.2D-STI can quickly evaluate the interventricular synchronization of LBBP and is better than TDI.