الفهرس 
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Abstract
Background: Brachial plexus is a bundle of nerves that arises from the neck crossing through the axilla to supply the whole upper limb with motor and sensory supply. The aim in upper limb surgeries is to block this plexus using local anesthetics. Objective: To study the effect of magnesium sulfate as an adjuvant to bupivacaine in supraclavicular brachial plexus block.Patients and Methods: In our study 82 adult patients (age group 18-60, ASA I-II) were randomly and evenly divided into two equal groups (41 patients each), control group received only bupivacine 0.5 % and magnesium group received 2.5ml of 10% of magnesium in addition to bupivacine 0.5%. Patients were in semisitting position 45 the block was introduced US guided. Results: Our study showed that addition of 250 mg of magnesium to bupivacine slightly delayed the onset time of both sensory and motor block (p value >0.05) which was non significant. Conclusion: The addition of 250 mg magnesium sulfate to bupivacaine 0.5 % solution in supraclavicular brachial plexus block prolongs the duration of sensory and motor blockade, the duration of postoperative analgesia and reduces the requirement of rescue analgesic without any detected side effects.