Ultrasound Guided Erector Spinae Block vs Thoracolumbar Interfascial Plane Block

Induction of anesthesia will be by IV propofol (2-2.5 mg/kg)

Fentanyl will be injected during the induction of anesthesia (1-1.5 mg/kg)

Rocuronium will be injected during induction of anesthesia (0.6 mg/ kg)

Sevoflurane inhalationa anesthesia will be used for maintainance of anesthesia

In the ESPB group, the probe will be placed in the parasagittal plane at the level of the L3 vertebrae. The spinous process will be visualized, and the probe will move 3 cm laterally from the midline. The erector spinae muscle will be visualized above the transverse process. The needle will be punctured in the craniocaudal direction using the in-plane technique. The needle will be directed superior to the transverse process . Then, 2 mL normal saline solution was injected into the deep fascia of the erector spinae muscle to confirm the proper injection site. After ensuring the location of the needle, 20 mL of 0.25% bupivacaine was administered. The same ESPB procedure will be performed on the other side. In total, 40 mL of 0.25% bupivacaine was administered.

In the mTLIP group, the probe will be placed vertically at the L3 vertebrae level. The spinous process and the interspinous muscles (i.e., multifidus, longissimus, and iliocostalis) will be visualized as the anatomic guide points. The probe will move laterally to identify the longissimus and iliocostalis muscles. The needle will be inserted between the longissimus and iliocostalis in the medial-to-lateral direction using the in-plane technique. After confirming the location of the needle, 20 mL of 0.25% bupivacaine was administered. The same mTLIP procedure will be performed on the opposite side. In total, 40 mL of 0.25% bupivacaine will be administered.