APOA1 and atrial fibrillation: AF apoA-I correlated positively with AF protein (rs = 0.721, P < 0.001), AF albumin (rs = 0.655, P < 0.001), platelets (rs = 0.403, P = 0.002), and sodium (rs = 0.261, P = 0.046), but negatively correlated with serum bilirubin (rs = − 0.554, P < 0.001), INR (International Normalized Ratio) (rs = − 0.399, P = 0.002), and the MELD score (rs = − 0.332, P = 0.010).