Following weaning from CPB, heparin is reversed by protamine. Administration of excess doses of protamine may have a deleterious effect on coagulation and contribute to postoperative bleeding with need of blood transfusions. In connection with CPB management, heparin and protamin doses are commonly calculated using body weight and ACT. However, a new Heparin-Protamin-Calculation computer program (HeProCalc) has been developed to provide patient titrated dosing of both heparin and protamin. However, any benefits regarding postoperative bleeding and transfusions has not been thoroughly investigated.