Comparison of the Analgesic Effects of Continuous Versus Single-Shot Serratus Posterior Superior Intercostal Plane Block in Arthroscopic Shoulder Surgery

30 mL of 0.25% bupivacaine will be injected as single-shot block 20 mins prior to surgery

In addition to administration of 30 mL of 0.25% bupivacaine prior to surgery, a catheter will be placed in the area to administer bolus of 1 mg/kg of 0.25% bupivacaine every 8 hours postoperatively.