A Comparative Study Between Different Volumes During Erector Spinae Block for Pain Control

A mark will be applied on the required level (T8), the midline (spinous processes) and the injection points 3 cm from midline.While the patient is in a sitting position with support from a member of staff, Preparation of the field with iodine will be made. Using ultrasound guidance with a 6-10 MHz linear probe anatomical landmarks will be identified including the transverse process at T8 level and the three layers of muscles from posterior to anterior: trapezius-rhomboid-erector spinae. After subcutaneous lidocaine 2% injection a 22-G spinal needle will be inserted under ultrasound guidance in plane, aiming towards the transverse process. After a Gentle contact with the transverse process, 0.25% bupivacaine is injected in increments with careful repetitive aspiration to avoid intravascular injection.