A Clinical Study Of Effectiveness On The Patients With Right Ventricular Outflow Tract Pacing Compared With Right Ventricular Apex Pacing

Objective:To investigate the different effects of the right ventricular outflow tract (RVOT)pacing on cardiac synchronization and cardiac function in comparison with the right ventricular apical(RVA) pacing.Methods:41 patients implanted pacemaker for sick sinus syndrome orⅢ°-AVB block were divided into two groups according to the pacing site, RVOT pacing group(21 patients)and RVA pacing group(20 patients). Left ventricular end diastolic diameter(LVEDD),left ventricular end systolic diameter (LVESD),left ventricular ejection fraction (LVEF),septum to posterior wall motion delay(SPWMD),the interventricular mechanical delay (IVMD) were measured before pacemaker implantation and 3 and 12 months after the implantation by echocardiography.Results:No significant difference in the pacing parameters between the two groups was observed at 3 and 12months after implantation. At 3 months after implantation, IVMD and SPWMD of ROVT pacing group became significantly smaller than those of RVA pacing group(P<0.05), other indexes were similar in the two groups. (P<0.05); At 12 months after implantation, IVMD,SPWMD,VEDD,LVESD were smaller and LVEF was higher in ROVT pacing group than those in RVA pacing group(P<0.05)Conclusion:Compared with RVA pacing, RVOT pacing is more beneficial to the cardiac synchronism and exerts less negative effect on ventricular function.