History of addiction.

No history of addiction to any drug.

Patients will be placed in left lateral position. A low-frequency curved array ultrasound transducer will be used. The ultrasound transducer will be placed in a longitudinal orientation 2-3 cm lateral to the midline to identify the hyperechoic line of the transverse process. After identification of muscles superficial to the transverse process and local infiltration of anesthesia into the superficial tissues, a block needle will be inserted in a craniocaudal direction until contact will be achieved with the transverse process where the tip will lay in the interfascial plane below the erector spinae muscle. A small bolus of local anaesthetic should be given through the block needle; the erector spinae muscle should be visualized, separating from the transverse process. A total of 20 mL bupivacaine 0.25% will be injected into the interfacial plane deep to the erector spinae muscle bilaterally. Forty minutes after the ESPB, the cutaneous sensory block will be assessed.

This questionnaire covers a total of 15 questions under five clinical dimensions of health; physical comfort (five-item), emotional status (four-item), psychological support (two-item), physical independence (two-item) and pain (two-item). a numerical rating scale of 11 point for each question leads to a minimum score of 0 (very poor recovery) and a maximum score of 150 (excellent recovery).

Postoperative pain assessed by VAS which scales from zero (no pain) to ten (unbearable pain).

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Intraoperative fentanyl dosage (μg)