Incidence and Predictors of Postoperative Nausea and Vomiting Following General Anaesthesia in Adult Patients Undergoing Elective Surgery: A Prospective Observational Study
Background: Postoperative nausea and vomiting (PONV) remains a frequent and distressing complication after general anaesthesia and can delay recovery, increase rescue medication use, and reduce patient satisfaction. Objectives: To determine the incidence of PONV during the first 24 postoperative hours and identify patient- and perioperative predictors among adults undergoing elective surgery under general anaesthesia. Methods: This prospective observational study included 80 adults undergoing elective surgery at Konaseema Institute of Medical Sciences and Research Foundation, Amalapuram, Andhra Pradesh, India, from January to June 2017. Demographic characteristics, smoking status, previous PONV or motion sickness, duration of surgery, anaesthetic maintenance, postoperative opioid exposure, and prophylactic antiemetic administration were recorded. Patients were assessed for nausea and vomiting for 24 hours. Univariable analysis and multivariable logistic regression were performed to identify predictors of PONV. Results: PONV occurred in 27 patients, giving an incidence of 33.8%. Nausea occurred in 31.3%, vomiting in 17.5%, and both in 15.0%. Most first episodes occurred within 2 hours after surgery. PONV was more frequent among females, patients with previous PONV or motion sickness, those receiving postoperative opioids, and those with surgery lasting more than 90 minutes. In multivariable analysis, previous PONV or motion sickness, female sex, and postoperative opioid use independently increased PONV risk, whereas prophylactic antiemetic administration was protective. Conclusion: Approximately one-third of adults experienced PONV after elective surgery under general anaesthesia. Female sex, previous PONV or motion sickness, and postoperative opioid exposure were important predictors. Risk-based prophylaxis and opioid-sparing postoperative analgesia should be emphasized to reduce PONV.