Interscalene Block Versus Infraspinatus-Teres Minor Interfascial Plane Block for Shoulder Arthroscopy

This prospective randomized controlled study aims to compare the effects of interscalene block, infraspinatus-teres minor interfascial plane block, and a control group on postoperative analgesia and diaphragmatic function in patients undergoing shoulder arthroscopy. A total of 120 patients will be enrolled and allocated into three groups. Postoperative pain scores, opioid consumption, rescue analgesic requirements, and diaphragmatic function will be evaluated and compared among the groups. The study seeks to determine whether the infraspinatus-teres minor interfascial plane block can provide effective postoperative analgesia with less impact on diaphragmatic function compared with interscalene block.

Inclusion Criteria: * Age between 18 and 65 years * ASA physical status I-II * Scheduled for elective shoulder arthroscopy * No known allergy to study medications * No psychiatric disorder * No opioid dependence * Ability to use patient-controlled analgesia (PCA) and complete VAS assessments * No contraindication to peripheral nerve blocks * Written informed consent obtained Exclusion Criteria: * Refusal to participate * Uncontrolled hypertension * Chronic pain or ongoing analgesic treatment * Significant cardiac disease (coronary artery disease, arrhythmia, heart failure) * Diabetes mellitus