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OBJECTIVE To determine the prognostic value of atrial fibrillation (AF) in patients with heart failure (HF) and preserved, mid-range or reduced ejection fraction (EF). METHODS Patients hospitalised for acute HF were enrolled in the Korean Acute Heart Failure registry, a prospective, observational, multicentre cohort study, between March 2011 and February 2014. HF types were defined as reduced EF (HFrEF, LVEF less then 40%), mid-range EF (HFmrEF, LVEF 40%-49%) or preserved EF (HFpEF, LVEF ≥50%). RESULTS Of 5414 patients enrolled, HF