Impact of Interscalene Block Combined With General Anesthesia on Burst Suppression in Shoulder Surgery Patients

The intervention consisted of an ultrasound-guided interscalene brachial plexus block (ISB) administered to patients in Group B prior to general anesthesia. The block was performed using a posterior in-plane approach with real-time ultrasound visualization. A total of 20 mL of 0.125% bupivacaine was injected around the C5-C6 nerve roots under sterile conditions by experienced anesthesiologists.

General anesthesia without regional block