Safety and efficacy of leadless pacemaker extraction using a novel retrieval tool: a multicenter analysis

Background Leadless pacemakers (LP) have emerged as a safe and effective alternative for cardiac pacing, increasingly adopted by the medical community. While rare, complications such as pacemaker syndrome or device dislodgment can occur. In such instances, the extraction of the leadless pacemaker and its replacement with a new device should be considered. Purpose This multicenter study aimed to describe the use of the Aveir retrieval sheath during Micra extraction procedure and to assess the success rates and potential complications associated with the procedure. Methods In this observational study, we analyzed prospectively collected data from 14 patients that underwent leadless pacemaker using Abbott retrieval catheter at three high volume centers for pacemaker extraction and leadless implant in United States. Thought femoral vein the Aveir steerable retrieval catheter is advanced to the right atrium and then across the tricuspid valve. Under TEE and fluoroscopy guidance the snare is advanced over the Micra, and the button is secured. A protective sleeve is advanced over the LP. With application of traction to snare and countertraction with the sleeve against the endocardium, the LP is free from the myocardium and removed via the sheath. (Fig. 1) The procedural duration should be intended as the combined total of the time taken for the extraction of the existing pacemaker and the implantation time of the new device. Extractions performed during the first year were described as early and thereafter as late. Procedural success was described as complete extraction of LP without procedural complication. Results The reason for early explant was LP dislodgment and for late explant was pacemaker syndrome. Median time to extraction was 4±2 months in early explant and 35±9 months in late explant. Procedural time in early and late groups was 68.7 and 72.3 min respectively (P=0.32). Fluoroscopy time in early and late groups was 12.2 and 16.4 respectively (P= 0.18). LP was then replaced with a transvenous pacemaker. Success was 100% in both groups. No complication occurred in both groups. Conclusion Micra pacemaker using Aveir retrieval catheter is an effective tool irrespective of dwell time.