During the period from 1958 to July 31, 1980, there were 1764 Cardiovascular Surgical cases consisting of 1166 congenital and 598 acquired lesions in the Department of Cardiothoracic Surgery, Seoul National University Hospital. For 1764 cases 1162 open heart surgery and 602 conventional operations were performed. Among 1166, congenital lesions 266 adult cases were found. Adult cases occupy 15.1% of the total cases consisting of 24.5% of acyanotic and 19.9% of cyanotic group. Over all operative mortality of adult cases was 6.8% compared with 12.4% of total cases. Left over congenital cardiovascular anomalies in Korea can be safely operated at the present time. The oldest operated patient among adult congenital cardiovascular anomalies was 57 years old female atrial septal defect case. For 1162 cases open heart surgery bubble oxygenators were utilized except 2 membrane oxygenators. Various kinds of bubble oxygenators have been used but recently Shiley**** oxygenators are being used exclusively with satisfactory results.