After weaning from cardiopulmonary bypass and before starting modified ultrafiltration, a TEG sample will be taken. The components studied are Reaction time (R), Coagulation time (K), Angle, Maximum Amplitude (MA) and whole blood clot lysis index at 30 minutes (LY30). Another TEG sample will be taken after finishing modified ultrafiltration and before protamine is given. The different components will be compared pre and after modified ultrafiltration. The Primary end points are the changes of the different TEG components after modified ultrafiltration. The secondary end points are the utilization of different blood products (packed red cells, fresh frozen plasma and platelets transfusion) during and after surgery.