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Dexmedetomidine infusion on subarachnoid block with bupivacaine in inguinal herniorrhaphies - A prospective study

Abstract: Background: Dexmedetomidine (D) is alpha-2 agonist that acts as an anaesthetic and analgesic substitute. The goal of this study was to see how intravenous (I.V.) dexmedetomidine affected the length of sensory and motor block, postoperative analgesia, sedation degree, and side effects. Aims: To assess the effect of Dexmedetomidine infusion on the duration of analgesia with spinal Bupivacaine for adult patients undergoing herniorrhaphy and to assess side effects. Materials and methods: Prospective study was done under the for a period of 11 months. In 80 adults aged 20 to 60 years scheduled for herniorrhaphies were allocated into two study groups, named B and BD using computer generated randomization. The enrolled patients were divided into 2 groups each 40 patients to receive either 0.5 µg/kg dexmedetomidine intravenous bolus over 10 min (Group BD) or saline infusion (Group B) prior to subarachnoid block with 0.5% hyperbaric bupivacaine 12.5 mg Results: Numerical pain rating scale scores were significantly lower in group BD. Total analgesic requirement was significantly less in group BD. Time to request for first analgesic dose was longer in group BD as compared to group B. The duration of analgesia was longest in patients received intravenous dexmedetomidine along with spinal bupivacaine. Hemodynamic parameters and incidence of side effects were similar in both the groups. Conclusion: Premedication with single dose of intravenous dexmedetomidine 0.5 µg/kg prior to subarachnoid blockade with 0.5% hyperbaric bupivacaine hastens the onset and increases duration of sensory and motor block, with maintenance of stable hemodynamics and arousable sedation in Inguinal Herniorrhaphies.
Keywords: bupivacaine / intravenous / adults / dexmedetomidine / group BD / subarachnoid / herniorrhaphies / block / duration

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