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  • Title: Clonidine and analgesic duration after popliteal fossa nerve blockade: randomized, double-blind, placebo-controlled study.
    Author: YaDeau JT, LaSala VR, Paroli L, Kahn RL, Jules-Elysée KM, Levine DS, Wukovits BL, Lipnitsky JY.
    Journal: Anesth Analg; 2008 Jun; 106(6):1916-20. PubMed ID: 18499632.
    Abstract:
    BACKGROUND: We tested the hypothesis that 100 microg clonidine added to 0.375% bupivacaine would prolong the duration of analgesia from popliteal fossa nerve blockade. METHODS: Ninety-nine patients scheduled for hospital admission after foot or ankle surgery entered this randomized, double-blind, placebo-controlled trial. Patients received a popliteal fossa block (nerve stimulator technique, via the posterior approach) using 30 mL 0.375% bupivacaine, with epinephrine. Patients were randomized to receive no clonidine, 100 microg clonidine IM, or 100 microg clonidine with bupivacaine for the popliteal block. Patients also received a combined spinal-epidural anesthetic, a saphenous nerve block, and postoperative IV patient-controlled analgesia. The primary outcome was patient-reported duration of analgesia. RESULTS: Duration of analgesia was statistically longer in the block clonidine group (18 +/- 6 h for clonidine with bupivacaine vs 14 +/- 7 h for IM clonidine and 15 +/- 7 h for control, P = 0.016 for control vs clonidine with bupivacaine). Pain scores, analgesic use, and side effects attributable to pain management were similar among groups. CONCLUSIONS: Clonidine significantly prolongs the analgesic duration after popliteal fossa nerve blockade with bupivacaine.
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