Ultrasound-guided interscalene block is commonly used for postoperative analgesia in patients undergoing shoulder arthroscopy. The location of local anesthetic injection may influence both block efficacy and the incidence of block-related complications. This randomized, double-blind clinical trial compares two different injection sites around the C5-C7 nerve roots using the same local anesthetic dose and volume. The study will assess block success, postoperative analgesia, opioid consumption, diaphragmatic function, and procedure-related complications.
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Ultrasound-Guided Interscalene Block
Procedure/SurgeryUltrasound-guided interscalene brachial plexus block performed before induction of general anesthesia. Participants are assigned to one of two injection sites around the C5-C7 nerve roots according to the randomized study protocol.
Postoperative Analgesic Efficacy
Postoperative analgesic efficacy will be assessed using patient-controlled analgesia demand and delivered dose counts and the need for rescue analgesia.
Time to First Rescue Analgesic
Time from the end of surgery to first rescue analgesic administration.
Hemidiaphragmatic Paralysis
Presence of ipsilateral hemidiaphragmatic paralysis assessed by ultrasonography.
Block-Related Complications
Incidence of vascular puncture, intraneural injection, Horner syndrome, dyspnea, hoarseness, nausea, vomiting, recurrent laryngeal nerve block, stellate ganglion block, and prolonged motor block.
Block Duration
Duration of sensory and motor block recorded during postoperative follow-up.
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