The aim of this study is to compare the addition of intrathecal dexmedetomidine or fentanyl as adjuvants to hyperbaric bupivacaine in the onset and duration of sensory and motor block, and postoperative analgesia.
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motor blockade onset
Timeframe: from injection up to Modified Bromage score 1 ( 5 minutes)
sesnory onset
Timeframe: from injection up to s1 regression ( 5 minutes)
post operative analgesia
Timeframe: from injection up to 24 hours post operative