Causes: aortic root aneurysm 22 cases (44.2%), aortic root abscess 11 (21.2%), aortic dissection 10 cases (19.2%), aortic valve disease 8 cases (15.4%)); ejection fraction (EF) 60.1±12.6; Elective surgery 45 cases (86.5%), emergency surgery 7 cases (13.5%); Extracorporeal circulation time 213.6±66.7 minutes, aortic clamping time 160.9±53 minutes.