Transversalis Fascia Plane Block Versus Intrathecal Morphine for Postoperative Analgesia in Total Abdominal Hysterectomy

Patients will receive spinal anesthesia (using 3.5 mL of hyperbaric bupivacaine 0.5%) with bilateral transversalis fascia plane (TFP) block (using 20 mL of bupivacaine 0.25%) at the end of surgery.

Patients will receive spinal anesthesia (using 3 mL of hyperbaric bupivacaine 0.5%) + (75 µg morphine diluted in 0.5ml saline) with sham block at the end of surgery.