Abstract 2910: Pacing From the Right Atrial Appendage Enhances the Intra- and Inter-atrial Dyssynchrony: Utility of Tissue Doppler Imaging
Background: Conventional right atrial (RA) appendage pacing (Ap-P) may cause an atrial conduction delay, deteriorated the cardiac function, and causing overt heart failure.
Methods: This study included 50 patients with Ap-P (Ap-P-Gr), 20 with RA septal pacing (Sep-P-Gr), and 241 control subjects whose atria were activated by the intrinsic conduction system (Control-Gr). Using a direct atrial wall velocity measurement by tissue Doppler imaging, the RA-, left atrial (LA)-, and interatrial-dyssynchrony were determined.
Results (See Table⇓): The RA-, LA- and interatrial-dyssynchrony in Ap-P-Gr were the greatest among the 3 groups. RA-dyssynchrony was greater in Sep-P-Gr than Control-Gr, but the LA- and interatrial-dyssynchrony were comparable between those 2 groups.
Conclusions: Conventional Ap-P resulted in an atrial conduction delay and delayed onset of the LA systolic contraction, and Sep-P could resolve those problems.