Genetic polymorphisms of interleukin-6 and interleukin-10 are not associated with new onset atrial fibrillation after coronary artery bypass graft surgery

Abstract

Abstract Purpose To estimate the association of the genetic polymorphisms of Interleukin-6 (IL-6) and Interleukin-10 (IL-10) with new onset atrial fibrillation (AF) in postoperative period of coronary artery bypass graft (CABG) surgery in patients with coronary artery disease (CAD). Methods Studied were 158 patients who underwent CABG. In all the patients routine laboratory and instrumental tests were performed. Patients also underwent genetic polymorphisms of IL-6 C174G, IL-10 C592A and IL-10 G1082A estimation. All the patients were divided into two groups: 1 group comprised 111 patients without AF (82.0% men, median age 62.0 (56.0; 66.0) years, 2 group - 47 patients with AF development after CABG (84.4% men, median age 65.0 (61.0; 70.0) years). Results During the observation period AF occurred in 29.7% patients, on average 5.2 (2.0; 7.0) days after surgery. Patients of group 2 had longer history of CAD (60.0 (13.5; 138.0) vs. 15.5 (8.0; 72.0) months, p=0.01), had more often NYHA III class (27.7% vs. 9.0%, p=0.002) and larger left atrial (LA) diameter (44.0 (40.5; 46.0) mm vs. 38.0 (36.0; 40.0) mm, p<0.0001) comparing with group 1. Genotype CC IL-6 C174G was found in 19.8% patients of the 1 group and in 25.5% patients of the 2 group (p=0.42), genotype CG - in 56.8% and 53.2% (p=0.68), genotype GG - in 23.4% and 21.3% (p=0.77) respectively. Genotype CC IL-10 C592A was found in 62.2% patients of the 1 group and 46.8% patients of the 2 group (p=0.29), genotype CA - in 37.8% patients of the 1 group and in 53.2% patients of the 2 group (p=0.07) respectively. Genotype GG IL-10 G1082A was found in 25.2% patients of the 1 group and 23.4% patients of the 2 group (p=0.8), genotype GA - in 48.6% patients of the 1 group and in 59.6% patients of the 2 group (p=0.2), genotype AA - in 26.2% patients of the 1 group and in 17.0% patients of the 2 group (p=0.3) respectively. All estimated genotypes fulfilled expectations of Hardy-Weinberg equilibrium. According to the result of multivariate regression analysis the odds ratio for AF development in postoperative period of CABG for history of CAD more than 20 months - 1.1 (95% CI, 1.03–1.2, p=0.04), for LA dimension more than 41 mm - 1.5 (95% CI, 1.28–1.79, p<0.0001). Conclusion Our investigation showed that increased left atrial dimension and the history of coronary artery disease were associated with postoperative atrial fibrillation development in patients who underwent coronary artery bypass graft surgery. However, genetic polymorphisms of IL-6 C174G, IL-10 C592A and IL-10 G1082A were not significantly associated with postoperative atrial fibrillation development. Funding Acknowledgement Type of funding sources: None.