Addition of magnesium sulfate to bupivacaine prolongs onset and duration of sensory block .
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by one or more authors of the
original publication.
Effects of adjunct intrathecal magnesium sulfate to bupivacaine for spinal anesthesia: a randomized, double-blind trial in patients undergoing lower extremity surgery
J Anesth. 2011 Dec;25(6):892-7. doi: 10.1007/s00540-011-1227-z. Epub 2011 Sep 1879 patients undergoing lower extremity orthopedic surgery were randomized to examine the effect of additional magnesium sulfate (MgSO4) to bupivacaine on spinal anesthesia. Patients received either 100 mg magnesium sulfate 5% (0.2 ml) with 15 mg bupivacaine 0.5% or 15 mg bupivacaine 0.5% plus 0.2 ml normal saline (control). Assessment after the first 24 hours revealed that the addition of magnesium sulfate to bupivacaine lengthened the duration of sensory block, reduced postoperative analgesic consumption, and significantly prolonged the onset of spinal anesthesia.
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