Some changes following administration of Histidine-Tryptophan-Ketoglutarate (HTK) Custodiol including Anemia and hyponatremia are not uncommon in our cardiac patients. However we have noticed degrees of hematuria in our patients who have received Custodiol Bretschneider solution). Although wasting of the cardioplegic solution was effective in some patients, my last patient had hematuria on the contrary to the wasting of the solution. I didn't find any report in the literature. Please share your ideas about the reason and possible solutions.