While AF apoA-II did not correlate significantly with serum HDL cholesterol, it showed a moderate positive correlation with AF total cholesterol (rs = 0.452, P < 0.001), and weak positive correlations with AF HDL cholesterol (rs = 0.278, P = 0.033) and AF LDL cholesterol (rs = 0.332, P = 0.010). Here, APOA2 is linked to atrial fibrillation.