Time of course CD64, a leukocyte activation marker, during extracorporeal circulation

CD64 is a high-affinity leukocyte receptor for the Fc portion of IgG [1]. As CD64 expression on neutrophil cells (PMNs) is upregulated specifically after bacterial stimulation, it could be used to discriminate inflammatory states from bacterial infections [1-3]. The objective was a comparison of the time course of CD64 expression on PMN cells between patients undergoing cardiac surgery with extracorporeal circulation (ECC) with septic patients.