Serum miR-29b recorded a positive correlation with the presence of low AF (r = 0.405, P = 0.008), while SLC3A1 mRNA expression was positively correlated with FBW (r = 0.287, P = 0.043) and its correlation with the presence of abnormal Doppler (r = −0.555, P < 0.0001) and low AF (r = −0.425, P = 0.002) were intensified. This evidence concerns the gene SLC3A1 and atrial fibrillation.