patients will receive combined general anesthesia and Quadratuslumborum block( transincisional ie before wound closure)with 19 mL of bupivacaine 0.20%plus 1 mic/kg of dexmedetomidine ,total volume 20 ml.

patients will receive combined general anesthesia and quadratus lumborum block (transincisional) with 20 ml of bupivacaine 0.20%.

patients will receive combined general anesthesia and Quadratuslumborum block( transincisional ie before wound closure)with 19 mL of bupivacaine 0.20%plus 1 mic/kg of dexmedetomidine, total volume 20 ml

After extubation, an intravenous patient - controlled system, will be connected to the patient (Accufuser plus 100 ml) will be prepared with 60 ml isotonic saline containing 60 mg morphine , it will be programmed to give 0.5 ml bolus dose with lockout interval of 8 minutes. Time to first bolus will be recorded considering extubation time is the zero time

PCA will prepared with 60 mL of normal saline containing 60 mg of morphine, and the system will be programmed to give a 0.5 mL bolus dose with a lockout interval of 8 min.