Innate immune response in the patients with heart disease and acute kidney injury after coronary artery bypass grafting, depending on the duration of extracorporeal circulation

Incidence of chronic diseases is increased in the 21^st century due to prolonged life expectancy. Cardiovascular disease is the most common disorder worldwide, complicated with high morbidity and mortality. Upon increased prevalence of this disease, cardiac surgery has become an essential strategy for patients that do not respond to medications and other therapeutic procedures. Some potential complications in cardiac surgery affect kidneys, lung, brain over the postoperative period. Acute kidney injury (AKI) is considered a serious complication of cardiac surgery characterized by rapid loss of kidney function leading to acute increase in the serum creatinine concentration. AKI occurs in up to 30% of patients after cardiac surgery and is observed in 2% of the cases with isolated coronary artery bypass grafting (CABG). There are literature data concerning the patients with coronary artery disease after CABG in the presence of evolving atherosclerosis. Development of inflammation and dysadaptation of innate immunity was established in this work. An imbalance in the cytokine system contributes to the progression of endothelial dysfunction and may promote development of renal injury after CABG. Hypercytokinemia in AKI patients suggests involvement of innate immunity factors in the development of acute inflammatory response. The purpose of this article was to assess the innate immune response in the patients subjected to CABG with different duration of extracorporeal circulation. In the present study, 100 patients underwent CABG, all of whom were in the on-pump group. General clinical, functional, biochemical, instrumental, immunological and statistical methods were used in the work. After analyzing the data on the content of pro- and anti-inflammatory cytokines in blood serum of the patients with stage 1 and 2 AKI (KDIGO), depending on the duration of cardiopulmonary bypass surgery, we found that their dynamics corresponded to the standard pattern of changes after CABG groups and hyperproduction of pro- and anti-inflammatory cytokines in the groups with higher duration of cardiopulmonary bypass. The pathogenetic role of pro- and anti-inflammatory mediators remains unclear. We support the view that the clinical prognosis after cardiopulmonary bypass depends on the balance of pro- and anti-inflammatory cytokines.