Erector Spinae Block vs Morphine in Vertebral Fixation

Ultrasound-guided interfascial technique, aiming to block the anterior and posterior branches of the spinal nerves for multi-dermatomal analgesia. Injection of local anesthetic in the plane deep to the erector spinae muscles and superficial to the transverse processes, to achieve a craniocaudal distribution along several vertebral levels.

Patient-controlled intermittent boluses of morphine 1 mg (maximum once every 15 minutes).