Despite recent advances in postoperative delirium research, the proportion of patients with postoperative delirium is still high ranging between 20-80%. Although postoperative delirium is a frequent complication and is associated with the need for more inpatient hospital care and longer length of hospital stay, little is known about risk factors for recovery room delirium (RRD) occurred in postanaesthesia care unit. The aim of the study was to determine pre- and intraoperative risk factors for the development of RRD among patients undergoing non cardiovascular surgery.

Recovery room delirium (RRD) defined as delirium occurred in PACU was diagnosed according to CAM-ICU criteria. Pre-, intra-, and postoperative data of patients undergoing elective non cardiovascular surgery were prospectively collected, univariate and multivariate logistic regression were performed to find the risk factors related to postoperative delirium.

Inclusion Criteria:

• elective non-cardiovascular surgery
• general anesthesia

Exclusion Criteria:

• under 18yr of age
• under regional anaesthesia
• refused to sign consent form
• history of substance dependence
• underwent neurosurgery
• history of primary neurologic diseases
• stayed less than 10min in PACU
• received general anaesthesia but recovered in locations outside the recovery room

Patients over the age of 18yr, who were admitted to the PACU after elective surgery under general anaesthesia during regular working hours (9:00Am to 5:00Pm)