Coronary artery bypass graft operation (CABG) is a common surgical procedure in Austria and all over the world. Cardiopulmonary Bypass is known to effect a generalized endogenous immune reaction similar to that described in sepsis. This effect may play an important role in development of infectious post-surgical complications, which lead to increased suffering and costs as well as prolonged hospital stay. The production of IL-10 and the involvement of TH2-type lymphocytes seem to be important factors in the development of immune suppression. Although ST2 plays an important role in TH2...