TNNI3 and atrial fibrillation: Finally, 469 patients with AF and concomitant HFpEF were selected for analysis; 174 patients (37.1%) were stratified into the elevated hs-cTnI group (≥ 99th percentile URL), and 295 patients (62.9%) were placed in the non-elevated hs-cTnI group (< 99th percentile URL) (Fig. 1).