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The ultra sound probe will be placed on the paravertebral region in a Sagittal plane about 3 cm lateral to the T5 spinous process on the operating side to locate erector spinae muscle, rhomboid major and trapezius from inward (To reach T5, we used C7 as an anatomical landmark, which is the most prominent vertebrae in the back and count downwards to reach T5. To locate C7, we will use palpation or ultrasound guidance if there is difficulty in palpation). Following visualization of these muscles and the transverse process of T5, the skin will be infiltrated with 5 ml of 2% lidocaine, and then 30 ml bupivacaine 0.25% will be injected in the plane between the erector spinae muscle and transverse process using a 22-G 10-cm nerve block needle.

Patients in group L will receive an initial bolus of lidocaine 1.5mg /kg over 10 minutes immediately before the induction of general anaesthesia then 1.5mg/kg/hr lidocaine infusion in a 50cc syringe pump intra operatively that will be stopped at the end of surgery.