Age-specific outcomes after transcatheter left atrial appendage occlusion with the watchman device

Background  Transcatheter left atrial appendage occlusion (LAAO) has become a suitable alternative to anticoagulation in patients with atrial fibrillation (AF). However, outcomes among patients age > 75 years undergoing LAAO are lacking.

Methods  We included 723 consecutive patients with AF undergoing LAAO from August 2015 to March 2020. Patient data including clinical, laboratory, procedural characteristics, medications and outcomes were collected. The primary composite outcome was major adverse cardiac events (MACE) including mortality, stroke, bleeding and readmissions at 60-days.

Results  Mean age was 75 ± 8 years and 434 (60%) were males. Median CHA₂DS₂-VASc score was 4 (IQR: 4, 5) points and median HASBLED score was 4 (IQR: 3, 4) points. Composite MACE outcome was significantly higher among patients age > 75 years in both unadjusted (17.1% vs. 11.5%, P = 0.03) and adjusted (Odds Ratio = 1.59, 95% CI: 1.02 – 2.46, P = 0.04) analysis. Composite MACE was primarily driven by higher all-cause mortality (1.3% vs. 0, P = 0.04) among patients age > 75 years. The secondary outcome of procedural success was also lower among patients age > 75 years (92.2% vs. 96.2%, P = 0.02). The occurrence of stroke (P = 0.38), major bleeding (P = 0.29) and readmissions (P = 0.15) did not differ between patients age > 75 years and less than 75 years.

Conclusion  Patients age >75 years undergoing LAAO have worse outcomes primarily driven by higher all-cause mortality and are less likely to achieve procedural success. Future prospective studies evaluating these findings are warranted.