This randomized controlled trial aims to compare the effectiveness of interscalene (ISB) and infraspinatus-teres minor (ITM) blocks for postoperative analgesia in patients undergoing elective arthroscopic shoulder surgery. The primary outcome is total 24-hour opioid consumption. Secondary outcomes include pain scores, hemidiaphragmatic paresis incidence and severity, duration of analgesia, and changes in lung function. Participants are randomized into ISB or ITM groups; blocks are performed under ultrasound guidance. Postoperative pain is managed with patient controlled analgesia(PCA).
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Total 24-Hour Postoperative Opioid Consumption
Timeframe: 0-24 hours postoperatively