Fig. 1. Typical example of CD18 expression on neutrophils in one patient who underwent surgery with (left ) and one who underwent surgery without cardiopulmonary bypass (CPB) (right ). Histograms represent CD18 expression (mean fluorescence intensity, horizontal axes, filled histograms) or fluorescence intensity of neutrophils stained with an isotype control antibody (open histograms) versus cell count (vertical axes). The dotted lines indicate mean fluorescence intensity of baseline.