Erector Spinae Plane Block in Spine Surgeries for Postoperative Pain

After induction of anesthesia and prone positioning and before surgery, Erector Spinae Plane Block was performed bilaterally using a low-frequency curved ultrasound transducer placed in a longitudinal orientation 3 cm lateral to the spinous process one vertebral level above a predetermined marked surgical incision. An 8-cm 22-gauge block needle was inserted in a cephalad to caudad direction until the tip lay in the interfascial plane below the erector spinae muscle, the block was performed by injection of 20 ml of 0.25% bupivacaine. Fentanyl 1 µg/kg as a rescue analgesia was given based on hemodynamic parameters.