SAS and Delirium
Data of SAS score of patients were presented in Table 3. The incidence rate of delirium was strongly associated with intraoperative SAS score .Patients who developed delirium after OPCABG had significant lower SAS score than those without delirium (P<0.001), and the univariate and multivariate regression analysis showed that the intraoperative SAS score was significant predictors of delirium following OPCABG (P<0.001; P<0.001) (Table 5 and 3).
In the Kaplan-Meier analysis, we stratified SAS score according to previous reports, we categorized SAS score ≤3 as A, 4~6 as B, 7~10 C.
As shown in Fig.2, the incidence rate of postoperative delirium was strongly associated with stratification of SAS score and lower stratification of SAS score was predictive of higher delirium incidence rate. The cumulative event rates of delirium in Kaplan-Meier survival curves showed that patients with lower stratification of SAS score had a significant higher incidence rate of delirium (P<0.001). The predictive value of intraoperative SAS score for incidence of new onset SAS score following OPCABG were depicted in Fig. 3, the area under ROC was 0.934 (95%CI, 0.907-0.960, P<0.001), which also indicated that delirium score less than 4.5 was independent predictors of delirium.