Right Ventricular Outflow Tract Septal Pacing Is Superior to Right Ventricular Apical Pacing

Background-—The effects of right ventricular apical pacing (RVAP) and right ventricular outflow tract (RVOT) septal pacing on atrial and ventricular electrophysiology have not been thoroughly compared. Methods and Results-—To identify a more favorable pacing strategy with fewer adverse effects, 80 patients who had complete atrioventricular block with normal cardiac function and who were treated with either RVAP (n=42) or RVOT septal pacing (n=38) were recruited after an average of 2 years of follow-up. The data from electrocardiography and echocardiography performed before pacemaker implantation and at the end of follow-up were collected. The patients in the RVOT septal pacing and RVAP groups showed similar demographic and clinical characteristics before pacing treatments. After a mean follow-up of 2 years, the final maximum P-wave duration; P-wave dispersion; Q-, R-, and S-wave complex duration; left atrial volume index; left ventricular end-systolic diameter; ratio of transmitral early diastolic filling velocity to mitral annular early diastolic velocity; and interventricular mechanical delay in the RVOT septal pacing group were significantly less than those in the RVAP group (P<0.05). The final left ventricular ejection fraction of the RVOT septal pacing group was significantly higher than that of the RVAP group (P<0.05). Conclusions-—Compared with RVAP, RVOT septal pacing has fewer adverse effects regarding atrial electrical activity and structure in patients with normal cardiac function. ( J Am Heart Assoc. 2015;4:e001777 doi: 10.1161/JAHA.115.001777) Key Words: cardiovascular diseases • electrophysiology • pacemaker A rtificial cardiac pacing refers to a type of treatment thatuses electrical impulses to maintain a suitable heart rat