IL-8 plasma levels before operation and after cardiopulmonary bypass. IL-8 plasma levels in the treated and control groups, before operation (t1) and 10 minutes (t2) and 2 hours (t3) after cardiopulmonary bypass. Significant elevation was found in both groups (*Friedman tests). At t2 and t3 the IL-8 plasma levels were lower in group A. The between-group differences were significant (+Kruskal–Wallis test).