Journal of opioid management
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To examine the characteristics of postoperative fentanyl effect-site concentrations during intravenous analgesia in patients requiring or not requiring a fentanyl bolus and in patients with or without postoperative nausea and vomiting (PONV). ⋯ Patients needing a postoperative fentanyl bolus require a higher fentanyl effect-site concentration possibly because of individual variations, and PONV depends on the postoperative fentanyl effect-site concentration.