Role of single nucleotide Т786C polymorphism of endothelial NO-synthase gene after myocardial infarction with ST-segment elevation

The aim — of research was to investigate possible associations between single nucleotide T786C polymorphism of endothelial NO‑synthase (eNOS) gene and clinical events in acute period of myocardial infarction with ST segment elevation (STEMI) and after 6 months of follow‑up.Materials and methods. 177 patients with acute STEMI (139 (78.5 %) males and 38 (21.5 %) females) at average age 61.73 ± 9.44 years that were included to the study between January 2016 and July 2018 were examined. Primary percutaneous coronary intervention using bare‑metal stent (BMS) was performed in 133 patients. In 44 patients system thrombolyses were previously performed. All patients were able to achieve recovery of blood flow at TIMI III level. To determine the T786C polymorphism of the eNOS gene, polymerase chain reaction was used with an electrophoretic scheme for detecting the result in real time. The combined endpoint (repeated hospitalization, de novo heart failure, angina pectoris, cardiovascular death, which occurred 6 months after discharge from the hospital) was analyzed.Results and discussion. The combined endpoint was observed in 24 carriers of 786TT genotype of eNOS gene, in 23 individuals with the 786TC genotype and in 25 patients with 786CC genotype. Kaplan‑Meier curves showed that patients with STEMI carriers of 786CC genotype had a higher incidence of a combined endpoint than individuals with the 786TC and 786TT genotypes after 6 months of follow‑up. Multivariate logistic regression analysis revealed that the 786CC polymorphism of eNOS gene is an independent predictor of adverse clinical events 6 months after STEMI.Conclusions. Along with traditional risk factors (SYNTAX score, TIMI score, abdominal obesity) 786СС polymorphism of eNOS gene was found as an independent predictor for adverse cardiovascular events in 6‑month observation period after successful primary percutaneous coronary intervention in STEMI patients.