<qa>  What is one of the most important factors in ischaemia-reperfusion injury to theOxidative stress is one of the most important factors in ischaemia-reperfusion injury to the transplanted organ. In kidney transplant recipients following factors were measured: glutathione level, activities of glutathione peroxidase GSH-PX, catalase CAT and superoxide dismutase SOD and superoxide anion production by granulocytes in whole blood without and after the stimulation with zymosan. 