Safety and Efficacy of Left Atrial Appendage Closure with the Amplatzer Cardiac Plug in Very High Stroke and Bleeding Risk Patients with Non-Valvular Atrial Fibrillation.

Introduction: Limited data exist on the outcomes after left atrial appendage closure (LAAC) with the Amplatzer™ Cardiac Plug (ACP; St. Jude Medical, Minneapolis, MN, USA) in patients with atrial fibrillation (AF) with very high stroke and bleeding risks, the subset expected to benefit most from this procedure. The objective of this study was to report clinical outcomes after LAAC with the ACP device in a very high stroke and bleeding risk cohort of patients with non-valvular AF and contraindications to oral anticoagulation (OAC).

Methods: LAAC using the ACP device was performed in 96 patients with AF who had median CHA2DS2-VASc and HAS-BLED scores of 5 and 3, respectively. Post-procedure, patients received dual antiplatelet therapy for 6 months. A transesophageal echocardiography (TEE) was scheduled at 6 months.

Results: Procedural success was 100%. Procedural-related complications occurred in 7.3% (pericardial effusion, 4.2%; thromboembolic events, 2.1%; device embolization, 1.0%). Additional thromboembolic events occurred in three patients during follow-up (92.7% follow-up). After 93.4 patient-years of follow-up, the annual rates of thromboembolic and major bleeding events were 3.2% and 1.1%, respectively. In those with TEE follow-up (70%), complete LAAC with no leaks was observed. Thrombus formation on the device was noted on TEE in two patients.

Conclusion: LAAC using the ACP device was associated with an acceptable low rate of embolic and bleeding events after a median follow-up of 9 months in a cohort of patients with AF who were amongst the highest stroke and bleeding risks reported so far in LAAC trials.