In contrast to ApoA-II, apoA-I was not increased in patients with SBP (median 108.8 vs. 165.7 μg/ml, P = 0.23) resulting in a higher AF apoA-II/apoA-I ratio in patients with SBP as compared to patients without (Fig. 2C,D). This evidence concerns the gene APOA2 and atrial fibrillation.