Preoperative fentanyl infusion with pharmacokinetic simulation for anesthetic and perioperative management of an opioid-tolerant patient.

UNLABELLED: For opioid-tolerant patients, conventional patient-controlled analgesia dosing may be ineffective. We present a cardiac surgery patient with a history of significant opioid tolerance and prior episodes of severe postoperative pain. Using the patient's response to a large-dose fentanyl infusion in conjunction with a pharmacokinetic simulation, effective intraoperative and postoperative fentanyl plasma concentrations were achieved.

IMPLICATIONS: A preinduction fentanyl infusion used in conjunction with pharmacokinetic simulation can be a useful tool for assessing individual limits of opioid tolerance, as well as determining an appropriate dose for acute pain management in opioid-tolerant patients.