Combined spinal epidural anesthesia (CSE) with bupivacaine alone is not sufficient to cover pain sequel during lower limb surgeries. Previous studies used addition of either Nalbuphine or dexmedetomidine to bupivacaine in epidural anesthesia giving a good result in pain control. In this study the investigators will evaluate and compare the addition of either Nalbuphine or dexmedetomidine to bupivacaine in epidural anesthesia to evaluate the analgesic efficacy of either drug.
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Duration of epidural analgesia
Timeframe: within 24 hour postoperative
Maximum level of sensory blockade
Timeframe: after 30 min of administering the local anesthetic in the epidural space