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ORIGINAL ARTICLE
Year : 2011  |  Volume : 27  |  Issue : 3  |  Page : 323-327

Clonidine as an adjunct to intravenous regional anesthesia: A randomized, double-blind, placebo-controlled dose ranging study


1 Department of Anesthesiology, University of Vermont, Plattsburgh, NY, USA
2 Candler Memorial Hospital, Savannah Georgia, Plattsburgh, NY, USA
3 CVP Hospital, Plattsburgh, NY, USA

Correspondence Address:
Christopher M Viscomi
Department of Anesthesiology, University of Vermont/Fletcher Allen Health Care, 111 Colchester Avenue, Burlington, VT 05401-1473
USA
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0970-9185.83674

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Background : The addition of clonidine to lidocaine intravenous regional anesthesia (IVRA) has been previously reported to improve postoperative analgesia in patients undergoing upper extremity surgery. Our objective was to perform a dose ranging study in order to determine the optimal dose of clonidine used with lidocaine in IVRA. Design & Setting : We performed a double-blinded randomized placebo-controlled study with 60 patients scheduled for elective endoscopic carpal tunnel release under IVRA with 50 ml lidocaine 0.5%. University-affiliated outpatient surgery center. Data collected in operating rooms, recovery room, and by telephone after discharge from surgery center. Materials &; Methods : Sixty adult ASA I or II patients undergoing outpatient endoscopic carpal tunnel release under intravenous regional anesthesia.Patients were randomized into five study groups receiving different doses of clonidine in addition to 50 ml 0.5% lidocaine in their IVRA. Group A received 0 mcg/kg, group B 0.25 mcg/kg, group C 0.5 mcg/kg, group D 1.0 mcg/kg and group E 1.5 mcg/kg of clonidine.Intraoperative fentanyl, recovery room pain scores, time to first postsurgical analgesic, total number of acetaminophen/codeine tablets consumed postsurgery, incidence of sedation, hypotension and bradycardia. Results & Conclusions : There was no benefit from any dose of clonidine compared to placebo. There were no clonidine-related side effects seen within the dose range studied. In short duration minor hand surgery, the addition of clonidine to lidocaine-based intravenous regional anesthesia provides no measurable benefit.


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