1) Patient age lower than 40 and higher than 70

2) Existence of preoperative medically treated COPD or renal disease

3) Existence of preoperative hematological dysfunction

4) Preoperative warfarine and/or fibrinolytic agent treatment

5) Acute MI with emergent surgery

6) Re-operations for CABG

7) Concomitant valve and/or vascular surgery

8) Existence of preoperative atrial fibrillation

9) Intraoperative or early postoperative deaths

10) IABP implantations

11) Beating heart CABG operations

12) LVEF below 35%