20
Participants
Start Date
October 31, 2025
Primary Completion Date
December 31, 2026
Study Completion Date
December 31, 2026
Cervical sympathetic nerve block
Patients will receive a CSB.
Subcutaneous sham injection
Patients will receive a subcutaneous sham injection of saline.
Ropivacaine
The CSB group will receive ropivacaine 0.5% 10ml.
Normal Saline
The control group will receive 3 ml of normal saline in the sham injection.
Stanford University
OTHER