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REGIONAL ANESTHESIA AND PAIN MEDICINE

What Concentration of Sufentanil Should be Combined with Ropivacaine 0.2% wt/vol for Postoperative Patient-Controlled Epidural Analgesia?

Department of Anesthesiology and Surgical Intensive Care, University of Münster, Münster, Germany

Address correspondence and reprint requests to Hugo Van Aken, MD, PhD, FRCA, FANZCA, Klinik und Poliklinik für Anästhesiologie und operative Intensivmedizin der Westfälischen Wilhelms-Universität Münster, Albert-Schweitzer-Strasse 33, D-48149 Münster, Germany. Address e-mail to hva{at}anit.uni-muenster.de

In this randomized double-blinded study, we sought to determine an optimal dose-combination of sufentanil with ropivacaine 0.2% wt/vol as postoperative epidural analgesics. One hundred twenty patients undergoing major abdominal surgery under general and thoracic epidural anesthesia (T9-11) were assigned to groups receiving patient-controlled epidural analgesia with ropivacaine 0.2% wt/vol (R), ropivacaine 0.2% wt/vol + sufentanil 0.5 µg/mL (R+S0.5), 0.75 µg/mL (R+S0.75), 1.0 µg/mL (R+S1). A visual analog score of less than 40 was considered effective, and all side effects were recorded. In randomized subgroups (10 patients per group), plasma pharmacokinetic data were obtained for both epidural drugs. Four patients in Group R and two in Group R+S0.5 were excluded because of inadequate analgesia. The drug infusion rates (range of means: 5.4–5.9 mL/h) were similar in all patients. Analgesia was superior for sufentanil 0.75 µg/mL with no further enhancement by the larger sufentanil concentration of 1 µg/mL. Sufentanil plasma levels were within the range of the minimal effective concentrations (highest in R+S1), and there was no covariation between plasma levels and pain relief. Free ropivacaine plasma concentrations remained stable for 96 h. No severe side effects were detected, although pruritus correlated with an increasing dose of sufentanil. We conclude that the combination of ropivacaine 0.2% wt/vol and 0.75 µg/mL sufentanil provided the best analgesia with the fewest side effects of the three combinations tested.

Implications: Sufentanil is added to epidural infusions of ropivacaine 0.2% wt/vol to improve the effectiveness of postoperative pain management. Regarding the risk of side effects, however, it is still unclear what concentration of sufentanil should be added to the local anesthetic. For postoperative thoracic epidural analgesia after major abdominal surgery, the combination of ropivacaine 0.2% wt/vol and 0.75 µg/mL sufentanil resulted in an appropriate cost:benefit ratio between good analgesia and side effects.

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