Early Expression of Fc [Formula: see text] RI (CD64) on Monocytes of Cardiac Surgical Patients and Higher Density of Monocyte Anti-Inflammatory Scavenger CD163 Receptor in “On-Pump” Patients

Objective. Activation of innate immunity cells is inseparably linked to cardiac surgical operation. The aim of this study was to assess the kinetics in the expression of receptor for Fc part of IgG, Fc [Formula: see text] RI (CD64), and scavenger receptor CD163 on peripheral blood cells of cardiac surgical patients and to examine the effect of cardiac bypass as a separable influence on the systemic acute inflammatory response. Methods. Forty patients, twenty in each group, were randomly assigned to CABG surgery performed either with “on-pump” or without “off-pump” cardiopulmonary bypass. Standardized quantitative flow cytometry method was used to determine the expression of surface markers. Results. The density of CD64 molecule on monocytes reached maximum on the 1st postoperative day ([Formula: see text]) whereas the peak for CD64 molecule expression on granulocytes was postponed to the 3rd postoperative day ([Formula: see text]). The expression of CD163 scavenger molecule on monocytes reached maximum on the 1st postoperative day ([Formula: see text]). The density of CD163 molecule on monocytes on the 1st postoperative day is significantly higher in “on-pump” patients in comparison with “off-pump” patients ([Formula: see text]). Conclusion. In cardiac surgical patients the expression of activation marker Fc [Formula: see text] R1 (CD64) on monocytes is increased earlier in comparison with granulocytes in both “on-pump” and “off-pump” patients. The expression of scavenger molecule CD163 on monocytes is significantly higher in “on-pump” patients.