Effects of Erector Spinae Plane Block on Opioid Consumption, Anesthetic Consumption and Hemodynamics in Lumbar Disc Herniation Surgeries.

After 0.03 mg/kg IV midazolam sedation is applied to patients who will undergo preoperative ESPB, bilateral ultrasound-guided ESPB (in-plane approach) will be applied over the vertebral level that is equidistant from the highest and lowest vertebral levels planned for surgery in the prone position. ESPB will be performed by experienced anesthesiologists. After sterilization of the skin with povidone iodine, the probe with a sterile sheath is placed 3 cm lateral to the spinous process and the trapezius, rhomboid major, erector spinae muscles and the transverse process of the vertebrae are visualized. The needle is placed in the fascial plane on the deep surface of the erector spinae muscle on the bone shadow of the transverse process of the vertebra. A total of 40 mL of 0.25% bupivacaine is administered bilaterally after the LA spread is seen. After waiting for the effect of the block for 30 minutes, the patients will be taken to the operating room.

Intraoperative ESPB will be performed by the neurosurgeon after LDH repair, starting from the level of the operated vertebra and covering all surgical segments. This procedure will be repeated for the other side (right/left). A total of 40 mL of 0.25% bupivacaine will be used for both sides.