2.2.4. Interscalene brachial plexus block.
ISB was performed under ultrasound guidance. After the puncture needle reached the target location under ultrasound guidance, 0.5 µg/kg dexmedetomidine compounded with 0.5% ropivacaine 15 to 20 mL was injected. The efficacy of the block was tested, and general anesthesia was induced after successful completion of the block.