Long-term risk of heart failure in patients with postoperative atrial fibrillation following non-cardiac surgery: Insights from a nationwide cohort.

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Atrial fibrillation (AF) is associated with heart failure (HF). However, it is unclear if postoperative AF (POAF) following non-cardiac surgery differs from non-surgical AF in terms of the risk of HF. We compared the long-term rate of incident HF in patients developing new-onset POAF following non-cardiac surgery with patients who did not develop POAF following non-cardiac surgery and patients with non-surgical non-valvular AF (NVAF). Using Danish nationwide registries, all patients aged ≥30 years who developed POAF following non-cardiac surgery (1996-2020) were identified and matched in a 1:3 ratio by age, sex, surgery type (only for the surgery group), selected comorbidities, and inclusion year with patients without POAF following non-cardiac surgery and individuals with NVAF, respectively. A total of 2270 patients with POAF were matched with 6810 patients without POAF following non-cardiac surgery, and 1846 patients with POAF were matched with 5538 patients with NVAF. The median follow-up was 7.2 years. Compared with patients without POAF, those with POAF had a higher associated long-term rate of incident HF (2.6 vs. 1.2 events per 100 person-years; adjusted hazard ratio [HR] 2.39, 95% confidence interval [CI] 2.06-2.78). Compared with individuals with NVAF, patients with POAF did not have a significantly different rate of incident HF (2.7 vs. 3.0 events per 100 person-years; adjusted HR 0.89, 95% CI 0.78-1.03). Patients with new-onset POAF following non-cardiac surgery had a higher associated long-term rate of incident HF compared to those without POAF, with no significant difference in the rate of incident HF when compared to patients with NVAF.