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Chinese Heart Journal. 2007, (02)

Effect of right ventricular outflow tract pacing and right ventricular apex pacing on cardiac function by tissue Doppler imagingChinese Full Text

WANG Wei,MENG Su-rong,CHEN Zhe-ming,RUAN Fa-hui,YANG Rong-hai(Department of Cardiology,Nanfang Hospital,Guangzhou 510515,Guangdong,China)

Abstract: AIM To compare the effect of right ventricular outflow tract（RVOT） pacing and that of right ventricular apex（RVA） pacing on the ventricular wall motion and cardiac function.METHODS RVA pacing was conducted in 15 patients（9 males and 6 females）,of whom 10 had sick sinus syndrome（SSS） and 5 had Ⅲ° atrioventricular block,and,underwent RVA pacing was conducted in 10 patients（6 males and 4 females）,of whom 5 had SSS and 5 had Ⅲ° atrioventricular block.Three months after installment of the dual-chamber pacemakers,tissue Doppler imaging was used to evaluated the time to peak in systolic phase of interventricular septum and left ventricular.CO,CI,SV,SVI and LVEF were also measured by conventional 2-Dimensional echocardiography.RESULTS Compared with RVA pacing,RVOT pacing better improved CO[（4.7±1.1） vs（5.6±1.0）L/min,P＜0.05]、CI[（3.1±0.7） vs（3.7±0.5）L/（min·m2）,P＜0.05]、SV[（70±14） vs（82±11）ml/次,P＜0.05]、SVI[（42±9） vs（49±9）ml/（次·m2）,P＜0.05] and LVEF[（46±7） vs（57±15）%,P＜0.05].RVOT pacing significantly shortened the time to peak in systolic phase and improved the consistency of wall motion as compared with the RVA pacing.CONCLUSION Compared with RVA pacing,RVOT pacing with a more physiological depolarization pattern and theoretically better hemodynamics,significantly improves ventricular performance,including cardiac function and cardiac synchronism.Tissue Doppler imaging is useful in evaluating the synchronism of ventricular wall motion and cardiac function.
Keywords：

tissue doppler imaging; cardiac pacing site; ventricular synchronism; cardiac function;

  • DOI：

    10.13191/j.chj.2007.02.108.wangy.034

  • Series：

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  • Classification Code：

    R540.4

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