Interscalene Versus Infraspinatus-Teres Minor Blocks for Arthroscopic Shoulder Surgery
Comparison of Interscalene and Infraspinatus-Teres Minor Blocks on Postoperative Opioid Consumption and Pain Scores in Patients Undergoing Arthroscopic Shoulder Surgery
Ataturk University
60 participants
Jan 1, 2026
INTERVENTIONAL
Conditions
Summary
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).
Eligibility
Inclusion Criteria3
- The American Society of Anesthesiologists I-III
- Scheduled for elective unilateral arthroscopic shoulder surgery
- Provide written informed consent
Exclusion Criteria7
- Refusal to participate
- Allergy to study drugs
- Severe cardiac, renal, or hepatic disease
- Neurological deficit or neuropathy
- Anticoagulant therapy
- Pre-existing respiratory dysfunction
- Chronic shoulder pain or planned open surgery
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Interventions
Patients receive ultrasound-guided ISB before arthroscopic shoulder surgery. After sedation with IV midazolam, 15 ml of 0.25% bupivacaine is injected using a 22 Gauge 50 mm needle with posterior in-plane approach, targeting C5-C6 roots.
Patients receive ultrasound-guided ITM interfascial block in sitting position before surgery. Using a 22 Gauge 10 mm needle, 25 ml of 0.25% bupivacaine is injected between infraspinatus and teres minor muscles via out-of-plane or in-plane hydrodissection.
Locations(1)
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NCT07253740