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REGIONAL ANESTHESIA AND PAIN MANAGEMENT

Interscalene Brachial Plexus Analgesia After Open Shoulder Surgery: Continuous Versus Patient-Controlled Infusion

Department of Anesthesiology, Université Catholique de Louvain School of Medecine, St. Luc Hospital, Brussels, Belgium

Address correspondence and reprint requests to F. J. Singelyn, MD, PhD, Department of Anesthesiology, St. Luc Hospital, Ave. Hippocrate 10/1821-B 1200 Brussels, Belgium. Address e-mail to Singelyn{at}anes.ucl.ac.be

In this prospective, randomized, double-blinded study, we assessed the efficacy of patient-controlled analgesia (PCA) for continuous interscalene analgesia after open shoulder surgery. Sixty patients were divided into three groups of 20. During a 48-h period, they received, via an interscalene catheter, a continuous infusion of 0.125% bupivacaine with sufentanil 0.1 µg/mL and clonidine 1 µg/mL at 10 mL/h in Group 1; a continuous infusion of the same solution at 5 mL/h plus PCA boluses (2.5 mL/30 min) in Group 2; and only PCA boluses (5 mL/30 min) of the same solution in Group 3. Pain scores, sensory block, supplemental analgesia, bupivacaine consumption, side effects, and satisfaction scores were recorded. At 24 and 48 h, sensory block was more frequent and pain control was significantly better in Groups 1 and 2 than in Group 3 (P < 0.001). In Group 3, larger doses of paracetamol were required. Bupivacaine consumption was significantly less in Groups 2 and 3 than in Group 1 (P < 0.001). Satisfaction was significantly higher in Groups 1 and 2 than in Group 3 (P < 0.01). Side effects were comparable in the three groups. We conclude that continuous interscalene analgesia requires a background infusion after open shoulder surgery. Because it reduces the local anesthetic consumption and allows the patients to rapidly reinforce the block shortly before physiotherapy, a basal infusion rate of 5 mL/h combined with PCA boluses (2.5 mL/30 min) is the recommended technique.

Implications: In this study, we demonstrated that continuous interscalene analgesia requires a background infusion to provide efficient pain relief after open shoulder surgery. A basal infusion of 5 mL/h combined with patient-controlled analgesia boluses (2.5 mL/30 min) seems to be the most appropriate technique.

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