Effect of Preoperative Ultrasound-Guided Stellate Ganglion Block on Postoperative Delirium in Older Adults Undergoing Elective Peripheral Endovascular Intervention

This randomized controlled trial will evaluate whether preoperative ultrasound-guided stellate ganglion block reduces the incidence of postoperative delirium in adults aged 60 years or older undergoing elective peripheral endovascular interventions. Participants will be randomly allocated in a 1:1 ratio to receive either a right-sided ultrasound-guided stellate ganglion block at the C6 level with 5 mL of 0.375% ropivacaine or a control group. Postoperative delirium will be assessed twice daily during the first 3 postoperative days using the 3-Minute Diagnostic Interview for Confusion Assessment Method-defined Delirium (3D-CAM).