Effectiveness, safety, and predictors of response to ultrasound-guided stellate ganglion blockades for the treatment of patients with chronic migraine: A retrospective and observational study.

Ultrasound-guided SGB was an effective and safe treatment for CM patients. The majority of responsive patients with CM benefited from repeated SGBs. CM patients who needed repeated SGBs may obtain good and sustained analgesic effect after receiving a greater number of SGBs. Patients without comorbidities such as anxiety or depression were more likely to benefit from SGB treatments.