Two cases of postoperative erythroderma.

Postoperative erythroderma is a rare disease of which the clinical course is almost always fatal. It is characterized by fever, skin rash, hepatic dysfunction and leukopenia, and many of the cases occur after cardiovascular surgery. We have experienced two cases of this disease which are suspected to be related to a large amount of blood transfusion. In the second case, we observed genetical mismatch of the HLA typing between the patient and his family members. This observation strongly suggests the possibility that postoperative erythroderma is a form of graft-versus-host (GVH) reaction induced by transfused lymphocytes. The reason why the patient's immunity is so suppressed as to cause GVH reaction is still unknown. Cardiopulmonary bypass and a large amount of fresh blood transfusion are suspected for immune suppression. The fact that postoperative erythroderma occurs almost exclusively in the Japanese cannot be fairly explained, either. Racial homogeneity in Japan might cause immune tolerance in blood transfusion.