Analgesic Efficacy of Serratus Posterior Superior Intercostal Plane (SPSIP) Block in Shoulder Arthroscopies

The Serratus Posterior Superior Intercostal Plane Block will be performed under ultrasound guidance. During the block, a linear ultrasound probe will be placed parallel to the spine of the scapula on the surgical side and then slid medially. The block needle will be advanced under ultrasound guidance over the 3rd rib. After the needle touches the rib, it will be withdrawn by 1mm, and the block site will be confirmed by injecting sterile 0.9% NaCl. Subsequently, patients will be administered 50mg of bupivacaine and 100mg of lidocaine in a controlled manner.

intravenous patient-controlled analgesia (PCA) with 4mg/ml Tramadol HCl in 100ml NaCl. There will be no basal infusion, with bolus doses of 20mg and a lockout period of 20 minutes, and a total dose limitation of 200mg over 4 hours