Associations of aldosterone synthase gene polymorphism and atrial fibrillation affected by coronary heart disease in elderly and senile patients

Given the significant increase in the frequency of atrial fibrillation (AF) in elderly and senile patients with confirmed coronary heart disease (CHD), the study of the relationship between the polymorphisms responsible for the functioning of the renin-angiotensinaldosterone system and the presence of this disease becomes relevant. Purpose of the study. To study the genetic polymorphism of the CYP11B2 gene in elderly patients with ischemic heart disease, as well as to identify the role of aldosterone synthetase in the development of AF in this category of patients. Materials and methods. The study included 140 patients of both sexes (54,3% – men), over the age of 60 years, with confirmed coronary artery disease and any form of AF (the last episode no later than 12 months from the date of inclusion in the study). 84 patients agreed to participate in the study of aldosterone synthase polymorphisms. The control group consisted of 34 patients who had no diagnosed non-infectious diseases at the time of the survey. Both groups were comparable in age and sex characteristics. Results. Comparative evaluation of the distribution of genotypes and alleles – C344/T of the aldosterone synthase gene among patients with AF+CHD and relatively healthy individuals revealed that in the first group, most patients had the CYP11B2 T/T genotype in 38,1% of cases, the incidence was higher, than in patients of the comparison group – 14,7% (OR = 3.44, CI 1.07-11.07, p = 0.038). The frequency of detection of genotypes of CYP11B2 С/T and CYP11B2 С/С did not significantly differ in the compared groups. In the group with AF+CHD, the T allele was significantly more common (53,6% vs. 35,3%; p<0,05), while the frequency of occurrence of allele C was significantly higher in the group of relatively healthy individuals (64,3% vs. 47,1%; p<0,05). Conclusion. AF in elderly and senile patients with CHD is associated with the presence of CYP11B2 T/T genotype (OR = 3,44, DI 1,07–11,07, p = 0,038) and is not associated with myocardial echocardiographic parameters, including the size of left atrium.