With regard to the CYP11B2 gene −344T/C polymorphism, −344TT, −344TC and −344CC genotypes were distributed according to the following percentages: lone AF group 50.3, 39.9, 9.8% and control groups 46.8, 41.1, 12.1%, respectively. Here, CYP11B2 is linked to atrial fibrillation.