Antiemetic Effect of the Addition of Ondansetron to the Morphine Solution in Patient-Controlled Analgesia (PCA)

PCA morphine always introduces nausea and vomiting during the postoperative period. Ondansetron can reduce PONV (postoperative nausea vomiting). We, the researchers at Khon Kaen University, are trying to add ondansetron in PCA morphine. Patients receive a small dose of ondansetron when they request morphine.