• I R Thomson, G Harding, and R J Hudson.
• Department of Anesthesia, University of Manitoba, Winnipeg, Canada.
• J. Cardiothorac. Vasc. Anesth. 2000 Dec 1;14(6):652-6.

ObjectiveTo compare fentanyl and sufentanil, administered in equipotent concentrations by target-controlled infusion, as components of a balanced anesthetic in patients undergoing coronary artery bypass graft (CABG) surgery.DesignA prospective, randomized, double-blind trial.SettingA university hospital.ParticipantsTwenty-one patients undergoing nonemergent, primary CABG surgery.InterventionsPatients received fentanyl (group F, n = 10) or sufentanil (group S, n = 11) by target-controlled infusion throughout the pre-cardiopulmonary bypass (CPB) period. To ensure equipotency, the target effect-site concentrations employed (fentanyl, 8.1 ng/mL, and sufentanil, 0.68 ng/mL) were equal to the IC50 for electroencephalographic effect. Isoflurane was administered as needed to maintain pre-CPB hemodynamics near preoperative baseline values.Measurements And Main ResultsHemodynamics and end-tidal isoflurane concentration were measured every 15 to 30 seconds. Serum opioid concentrations were measured 5 times between induction and CPB. Opioid cost was based on the number of ampules opened to provide the administered dose. The 2 groups were similar demographically. The pre-CPB serum opioid concentrations were constant and averaged fentanyl, 5.8 +/- 1.9 ng/mL, and sufentanil, 0.59 +/- 0.13 ng/mL. Pre-CPB hemodynamics were stable and similar in both groups. Pre-CPB end-tidal isoflurane requirements did not differ between groups and averaged 0.46 +/- 0.21% in group F and 0.56 +/- 0.24% in group S. The duration of post-operative endotracheal intubation was 9.1 +/- 5.0 hours in group F and 8.0 +/- 3.2 hours in group S (p = NS). The cost per patient of fentanyl (Canadian $6.12 +/- 1.04) was less than that of sufentanil (Canadian $17.47 +/- 4.65).ConclusionsWhen administered in a constant 10:1 concentration ratio, fentanyl and sufentanil do not differ in their ability to facilitate pre-CPB hemodynamic control. Although both opioids were relatively inexpensive, the acquisition cost of fentanyl was less than sufentanil. A recommendation regarding the opioid of choice for routine use in patients undergoing CABG surgery awaits more rigorous studies of recovery and cost after equipotent doses of fentanyl and sufentanil. When combined with isoflurane, effect-site opioid concentrations near the IC50 for electroencephalographic effect provide excellent pre-CPB hemodynamic control in patients undergoing CABG surgery.

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