Calculation of SAS
The SAS score of each patient was calculated based on intraoperative parameters including EBL, LMAP, and LHR. Comparing to Delirium group, significantly higher LMAP was recorded of patients in no-Delirium group (P<0.001). Furthermore, patients in Delirium group had much more EBL (P<0.001) while LHR (P=102) showed no significant statistical difference between two groups. The mean SAS score was in 4.2±0.8, 7.8±1.2 in two groups respectively, which showed significantly difference (P<0.001).