Erector Spinalis Plane Block in Bariatric Surgery

"An experienced anesthesiologist performed ESPB in all patients in sitting position bilaterally.~A linear ultrasound probe (6-13 MHz) was used for ultrasound guidance. Injection was done using in-plane technique. A 22G block needle (100mm, B-Braun, Germany) was inserted 3- cm lateral to the T9 spinous process and advanced in cranio-caudal direction. To separate erector spina muscle from the transverse process, initially 1-2 ml saline was injected; then 20 ml 0.5% bupivacaine and 5 ml 0.2% lidocaine were injected following separation. Diffusion of the drugs in erector spina plane at cranio-caudal line was ensured. No analgesic or sedative was used during the procedure."