Adding Magnesium Sulphate and Dexamethasone in Bupivacaine Femoral Nerve Block for Postoperative Analgesia in Elective Total Knee Arthroplasty
Keywords:
magnesium sulphate, dexamethasone, bupivacaine, femoral nerve block, total knee arthroplastyAbstract
Background: Total knee arthroplasty is usually a very painful procedure. A single-dose of femoral nerve block has been shown to be useful and effective in controlling postoperative pain, especially if perineural
adjuvants are added.
Methods: A total of 100 ASA physical status I – III patients undergoing elective TKA under spinal anesthesia were randomly allocated into two equal groups, Group D : given 20 ml Bupivacaine 0.25% with 8 mg
dexamethasone. Group DM : given 20 ml Bupivacaine 0.25% with 8 mg dexamethasone and 1 g magnesium sulphate, through femoral catheter. Patient characteristics, operative time, pain score, morphine consumption and duration of sensory/motor blockade were recorded.
Results: The study showed a significantly lower pain scores in first 6 hours, with a significantly lower in cumulative morphine consumptions in first 12 hours in DM group. There was no different in demographic data, operative time and duration of sensory/motor blockade between groups.
Conclusion: Perineural magnesium sulphate and dexamethasone improve postoperative pain outcomes in bupivacaine femoral nerve block.
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