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Background:   Pain occurring in the post-anaesthesia care unit (PACU) is common, distressing to patients and remains a management challenge for staff. This study aims to identify the factors affecting pain severity and delay in discharge of patients from the PACU.Methods:   Data from 590 consecutive postoperative patients in the PACU was collected over one month in 2012 at the Singapore General Hospital. Patient demographics, surgical, intraoperative anaesthetic and recovery data were collected. The primary outcome measured was postoperative pain score and secondary outcome was a delay in discharge. Univariate and multivariate logistic regression were performed to determine preoperative and intraoperative variables that may be associated with pain and delayed discharge.Results:   The majority (67.6%) of patients reported no to mild pain while 32.3% reported moderate to severe pain; 65.4% of patients had delayed discharge and 28.3% of these were a result of uncontrolled pain. Factors associated with moderate to severe postoperative pain included younger age, same day admissions, duration of operation &gt;2 h, abdominal, upper limb and spine surgeries and use of general anaesthesia. Factors associated with delay in discharge included higher body mass index, abdominal, spine and superficial surgeries, use of general anaesthesia, moderate to severe pain score and use of nurse controlled analgesia.Conclusions:   This study identifies predictive factors for postoperative pain and delay in discharge from the PACU. Knowledge of these factors may help in better clinical judgment for postoperative pain management and can lead to quality improvement measures for patient management and work flow in the PACU.

Factors affecting postoperative pain and delay in discharge from the post-anaesthesia care unit: A descriptive correlational study