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Cardiac surgery is known to initiate a complex physiological response with the immune system activation (SIRS), neurohormonal response, metabolic changes, coagulopathies etc. SIRS is triggered by tissue injury, myocardial ischemia, reperfusion, use of anaesthesia, cardioplegia, extracorporeal circuit etc. Excessive immune system activation is associated with progression of SIRS, life-threatening multi-organ dysfunction (MOD), and increased morbidity/mortality in the postoperative period. The immune system response is regulated and terminated by both cellular and humoral regulatory and inhibitory mechanisms including changes in expression of in our study monitored molecules: CD200/CD200R, sCD200R and CD95/CD95L. Methods: The study included the measurement the expression of CD95, CD95L, CD200R, and sCD200R molecules in granulocyte and monocyte populations in blood samples of 30 patients who underwent heart surgery using CPB. Samples collected before surgery, after surgery, and in the postoperative period (1st , 3rd , 7th day) were analysed by flow cytometry and sCD200R by ELISA. Results: We discovered a significant increase in the percentage of granulocytes expressing inhibitory molecule CD200R (from 5% to 17.8%) instantly after surgery. It might be presumed that these cells are less susceptible to...

Cardiac surgery is known to initiate a complex physiological response with the immune system activation (SIRS), neurohormonal response, metabolic changes, coagulopathies etc. SIRS is triggered by tissue injury, myocardial ischemia, reperfusion, use of anaesthesia, cardioplegia, extracorporeal circuit etc. Excessive immune system activation is associated with progression of SIRS, life-threatening multi-organ dysfunction (MOD), and increased morbidity/mortality in the postoperative period. The immune system response is regulated and terminated by both cellular and humoral regulatory and inhibitory mechanisms including changes in expression of in our study monitored molecules: CD200/CD200R, sCD200R and CD95/CD95L. Methods: The study included the measurement the expression of CD95, CD95L, CD200R, and sCD200R molecules in granulocyte and monocyte populations in blood samples of 30 patients who underwent heart surgery using CPB. Samples collected before surgery, after surgery, and in the postoperative period (1st , 3rd , 7th day) were analysed by flow cytometry and sCD200R by ELISA. Results: We discovered a significant increase in the percentage of granulocytes expressing inhibitory molecule CD200R (from 5% to 17.8%) instantly after surgery. It might be presumed that these cells are less susceptible to...