Department of Cardiology, 1. Maanshan Clinical College of Anhui Medical University, Maanshan Anhui 243000; 2. the First Affiliated Hospital of Bengbu Medical College, Bengbu Anhui 233000, China
Abstract：Objective To discuss the influence of low atrial septal pacing (LASP) on newly-onset atrial fibrillation in patients with sick sinus syndrome (SSS) complicating inter-atrial block. Methods Fifty-eight inpatients with SSS complicating inter-atrial block were selected, and divided into LASP group (n =23) and right atrial appendage
pacing (RAAP) group (n =35) according to the implantation sites of atrial leads. The changes of P wave duration and P wave dispersion before and after the operation, and changes of atrial electrode parameters during the operation, one month and 3, 6 and 12 months after the operation, and the occurrence of pacing related complications and newly-onset atrial fibrillation were observed in the two groups. Results (ⅰ) There is no significant difference in atrial electrode parameters and the incidence of pacing related complications between LASP group and RAAP group (P >0. 05). (ⅱ) In the LASP group, the duration of P wave is significantly shorter than that in the RAAP group[(117.7 ±7. 0) ms vs. (135. 1 ±8. 9) ms, P <0. 05] after pacing while P wave dispersion is also significantly lower than that in the RAAP group [(23. 9 ±4. 5) ms vs. (31. 5 ±5. 5) ms, P <0. 05] after pacing. (ⅲ) The incidence of postoperative atrial fibrillation in the LASP group is significantly lower than that in the RAAP group(0 vs. 20. 0%, P <0. 05). Conclusion LASP could reduce the incidence of postoperative atrial fibrillation in patients with SSS complicating inter-atrial block.
