Aim of the work is to compare the postoperative analgesic effect and any side effects of dexmedetomidine and magnesium sulfate when added to bupivacaine in spinal anesthesia in patients undergoing perianal surgery we concluded that addition of dexmedetomidine prolonged the sensory and motor block significantly when used with hyperbaric bupivacaine intrathecally without increasing the incidence of significant any side effect ... إقراء المزيد