Continue ESPB & Continue ESPB Combined With SAPB for Thoracotomy

For the block, the ultrasound (USG)probe will be placed longitudinally 2-3 cm lateral to the transverse process of the T4-5 vertebra. The erector spinae muscle will be visualized above the hyperechoic transverse process. Using in plane technique, the block needle will be advanced in the cranio-caudal direction and 5 ml of saline will be injected under the erector spinae muscle to confirm the block site. After the block site is confirmed, 30 ml of 0.25% bupivacaine (Marcain 0.5%® AstraZeneca, England) will be administered. The block catheter (Perifix® Braun, Germany) will then be inserted to block area

For ESPB, USG probe will be placed longitudinally 2-3 cm lateral to the transverse process of the T4-5 vertebra. The erector spinae muscle will be visualized above the hyperechoic transverse process. Using in plane technique, the block needle will be advanced in the cranio-caudal direction and 5 ml of saline will be injected under the erector spinae muscle to confirm the block site and 30 ml of 0.25% bupivacaine (Marcain®) will be administered. The block catheter (Perifix®) will be inserted. For SAPB, the USG probe will be placed parasagittal to the mid-axillary line at the 5th-6th rib level and the anechoic shadow of the costa together with the latissumus dorsi and serratus anterior muscles will be visualized. Then using in plane technique, the block needle will be advanced in the cranio-caudal direction and 5 ml of saline will be injected under the serratus anterior muscle and the block site will be confirmed and 30 ml of 0.25% bupivacaine will be administered.