Recurrent Gastrointestinal Bleeding in Patients With Atrial Fibrillation Treated With Left Atrial Appendage Occlusion.

BACKGROUND

Concomitant atrial fibrillation (AF) and gastrointestinal (GI) bleeding present a clinical challenge due to recurrent bleeding risk associated with anticoagulation for AF-associated stroke prevention. Left atrial appendage occlusion (LAAO) offers an alternative stroke prevention strategy, but its impact on recurrent GI bleeding remains unknown.

METHODS

This retrospective, multicenter cohort study used the TriNetX database to identify adults with AF on oral anticoagulation and a history of GI bleeding. Patients were stratified by treatment with or without LAAO. 1:1 propensity score matching (PSM) was employed. The primary outcome was recurrent GI bleeding. Cox regression analysis was used to generate hazard ratios (HRs) with 95% confidence intervals (CIs). Odds ratios (ORs) were used to evaluate effect sizes between groups. Kaplan-Meier curves were used for time-to-event analyses.

RESULTS

After PSM, 9259 patients were compared in each group. Odds of recurrent GI bleeding were consistently lower in patients undergoing LAAO than without LAAO across all follow-up intervals: at 3 months (OR 0.84; 95% CI 0.78-0.91), 6 months, 1 year, 3 years, and 5 years (OR 0.87; 95% CI 0.82-0.92). Kaplan-Meier analysis demonstrated significantly lower risk of recurrent GI bleeding with LAAO (HR 0.80; 95% CI 0.76-0.84; p < 0.01).

CONCLUSION

In patients with AF and prior GI bleeding, LAAO was associated with a significantly lower risk of recurrent GI bleeding at short-term and long-term time intervals.