To compare the mean duration of postoperative analgesia following addition of dexmedetomidine to ropivacaine versus plain ropivacaine in ultrasound guided rectus sheath block in patients undergoing midline laparotomies
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Mean duration of analgesia
Timeframe: Baseline , 30 minutes , 2 hours, 4 hours , 6 hours , 8 hours , 12 hours , 24 hours