ALB and heart failure: <h4>Objective</h4>This study investigated the association between lactate dehydrogenase-to-albumin ratio (LAR) and adverse outcomes in patients with heart failure with reduced ejection fraction (HFrEF) and heart failure with mildly reduced ejection fraction (HFmrEF).<h4>Methods</h4>This retrospective cohort study included 1,084 hospitalised patients with HFrEF or HFmrEF.