Erector Spinae Plane Block or Serratus Anterior Plane (SAP) Block Following Video Assisted Thoracic Surgery

In group A, ESP block will be performed. US probe will be placed longitudinally 2-3 cm lateral to the T5 transverse process. From superior to inferior, three muscles will be visualized on the hyperechoic transverse process; trapezius (upper), rhomboideus major (middle), erector spinae (lower). The block needle will be inserted cranio caudal direction and then for correction of the needle 5 ml saline will be injected deep into the erector spina muscle fascia. Following confirmation of the correct position of the needle 20 ml %0.25 bupivacaine will be administered for block

In group B, after lateral positioning, US probe will be placed in a sagittal plane over the midclavicular region of the thoracic cage. Then the 7th rib will be identified in the midaxillary line, followed by the identification of the following muscles overlying the 6th rib: the latissimus dorsi (superficial and posterior), teres major (superior), and serratus muscle (deep and inferior). The needle will be inserted in-plane with respect to the ultrasound probe targeting the plane superficial to the serratus anterior muscle. 5 ml saline will be enjected for correction. Following confirmation of the correct position of the needle 20 ml %0.25 bupivacaine will be administered for block.