Evaluating left ventricular systolic synchrony of different right ventricular pacing sites by tissue Doppler imaging
- VernacularTitle:组织多普勒显像评价右心室不同部位起搏对左心室收缩同步性的影响
- Author:
Minmin SUN
;
Xianhong SHU
;
Jie CUI
;
Songwen CHEN
;
Wenzhi PAN
;
Cuizhen PAN
;
Yangang SU
;
Wei WANG
;
Jin BAI
;
Shaowen LIU
- Publication Type:Journal Article
- Keywords:
Echocardiography;
Cardiac pacing,artificial;
Ventricular function,left
- From:
Chinese Journal of Ultrasonography
2008;17(6):476-478
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the effects of different right ventricular pacing sites on left ventricular systolic synchrony using tissue Doppler imaging(TDI).Methods A tota[of sixty-nine patients with indications for permanent pacemaker implantation were enrolled sequentially by Pace-ROAD study(Pacemaker-right ventricular outflow tract and apex study,a randomized control study).They were randomized to RVOT pacing group(group A)or RVA pacing group(group B).Echocardiographic study with TDl was performed before and after 3 month follow up,and the data were analysed off-line.The peak velocity(Vs),the time to the peak of S wave(Ts)of all 12 basal and middle segments of left ventricle were measured,and then the standard deviation of Ts(Ts-SD),the average of Vs(Vs-M)were calculated.Results Thirty-six patients were randomized to group A,while the other 33 patients to group B.In each group,one patient was rejected due to non-pacing rhythm during follow-up.After 3 month pacing,the Ts-SD of group A was significantly shorter than that of group B[(23.63±2.32)ms vs(31.54±2.93)ms.P=0.0387-].In the patients with the basal Ts-SD longer than 32.6 ms(group A2 and group B2),the Ts-SD was significantly shortened than the baseline in group A2 during follow-up,while no significant difference was found in group B2.And the follow-up Ts-SD of group B2 was significantly longer than that of group A2 r(38.19±18.34)ms vs(28.55±16.93)ms,P=0.0290].Conclusions RVOT pacing is associated with favorable left ventricular systolic synchrony than RVA pacing,especially in patients with worsened baseline systolic synchrony.
