This study was carried out in AL-ASSAD and Tishreen University Hospitals during the years 2013-2015, and included 174 patients who have been treated. Male: Female ratio was 1:2, and the average age of the sample of patients was 63. Great saphenous vein (medial) and internal thoracic artery Were used as grafts. analyzes blood values were normal in all patients before surgery. after surgery it has never been transfer platelets in the case of the beating heart .In the open-heart the average transfer platelet in patients was (0.23), the average amount of bleeding into Drainage in the beating heart surgeries was (902 ml) and was in the open-heart (1279 ml), the number of patients bled and the chest was opened again because of bleeding was (14 patients) it is (8%) of total patients , prolonged ACT was the most important cause of the bleeding with rate (64.2%), the percentage of patients who had Tamponade was (42.8%), the using of CPB more than 100 minutes has the greatest impact of bleeding with rate (78.5) .