Inclusion Criteria:  The patient's age was 18-75 years old; TAAD was diagnosed by aortic CTA before operation; Sun's operation was performed within two weeks of onset; Deep hypothermic circulatory arrest (DHCA) and selective unilateral cerebral perfusion via right axillary artery were used for brain protection; Adrenaline was used after operation  Exclusion Criteria:  Nervous system disease and mental system disease before operation; Recent acute coronary syndrome; Recent cardiac arrest; Recent poor perfusion of visceral or peripheral organs; Recent hypoxemia; Previous history of cardiac surgery; Intraoperative death and death within 48 hours after operation; Neurological or psychiatric symptoms occurred within 48 hours after operation; Adrenaline was not used after operation