ALB and atrial fibrillation: In patients aged >65 years, after PSM, patients with reduced albumin levels were at higher risk of composite outcome (HR, 1.42 [95% CI, 1.40–1.44]), all-cause death (HR, 2.62 [95% CI, 2.55–2.69]), heart failure (HR, 1.29 [95% CI, 1.26–1.32]), atrial fibrillation (HR, 1.11 [95% CI, 1.09–1.13]), severe ventricular arrhythmias (HR, 1.36 [95% CI, 1.28–1.45]), myocardial infarction (HR, 1.56 [95% CI, 1.50–1.62]), and Takotsubo cardiomyopathy (HR, 1.37 [95% CI, 1.10–1.71]), compared to older patients with normal albumin levels (Table S3).