Ultrasound-guided Interscalene Block Versus Infraspinatus-Teres Minor Plane Block in Shoulder Arthroscopy

This study aims to compare the efficacy and safety of ultrasound-guided Interscalene block (ISB) versus Infraspinatus-Teres minor (ITM) interfacial plane block in shoulder arthroscopic surgery. A prospective, randomized clinical trial will be conducted with 46 patients. Approval was obtained from the Medical Ethics Committee (2022/0126), and written informed consent will be collected from all participants. Patients aged 20-70, ASA I-II, scheduled for arthroscopic shoulder surgery will be divided before the induction of general anesthesia (GA) into two groups: Group A: will receive the ultrasound guided ISB technique with a 15ml solution of 7.5ml lidocaine 2% and 7.5ml bupivacaine 0.5% be injected between the anterior and middle scalene muscles. Group B: will receive the ultrasound guided ITM block with the same anesthetic solution be injected between the infraspinatus and teres minor muscles. Researchers will examine the following outcomes; 1. Primary outcome measure: Efficacy of analgesia by Pain score; will be measured by Numerical Rating Scale (NRS) score (0=no pain,1-3=mild,4-6=moderate,7-9=sever,10=most sever) at postoperative 12 hour. 2. Secondary outcome measures: 1. Duration of analgesia, starting from recovery from general anesthesia (GA) to 1st time giving the patient rescue analgesia ( measured by NRS pain score at 0, 6 ,12, 18 and 24 postoperative hours) 2. Risk of complications from techniques 3. Patient satisfaction after surgery. 4. Rescue analgesic consumption 5. Hemodynamics monitoring; measurements of heart rate and mean arterial blood pressure before induction of anesthesia and every 15 minutes during surgery till end of surgery

NCT Number	NCT07016386
Lead Sponsor	Misr University for Science and Technology
Conditions	Pain, Pain Management, Pain Management in Postoperative Care
Enrollment	46 participants
Start Date	2025-06-15
Primary Completion	2026-01-20 (estimated)
Study Completion	2026-01-31 (estimated)
Updated on ClinicalTrials.gov	2025-07-23