Use of Micra AV in Patients with High-grade Atrioventricular Block in Hong Kong: A Single Center Experience

Abstract

Background: Micra AV leadless pacemaker provides an alternative to conventional DDDR pacemakers in patients with high-grade atrioventricular (AV) block. This study aimed to report the real-world single-center experience of using VDD leadless pacing (Micra AV) compared to conventional transvenous DDDR pacing in patients with high-grade AV block in Hong Kong. Methods: A retrospective review of consecutive patients who underwent Micra AV between October 2020 and April 2022 compared to patients with matched age and comorbidities who received conventional DDDR pacing between January 2017 and April 2022. Patients with intermittent or permanent high-grade AV block were included. Results: The outcomes of 22 Micra AV patients were compared to 22 patients who received conventional DDDR pacemakers. The electrical performance was stable during follow-up in 95.5% of patients who received Micra AV. AV synchrony was maintained in 76.2% and 77.8% of patients who received Micra AV at baseline and 6 months, respectively. The mean procedure time was significantly shorter in the Micra AV group than in the conventional group (40.0 ± 14.1 minutes vs. 71.6 ± 33.7 minutes) (p < 0.001), and the length of stay post-implantation of pacemaker in Micra AV group was also shorter (median 1 day vs. 7 days). (p