Ultrasound-guided Stellate Ganglion Block for Treatment of Chronic Migraine in Adult

All SGB procedures will be performed by the same experienced physicians. Patients will be positioned in a supine position with the neck slightly hyperextended and receive a SGB procedure using the B-ultrasound visualization technique (Aurora A5 Ultrasound, Risco Tech Co., Ltd.). 1% lidocaine 5mL (Shanxi Jinxin Shuanghe Pharm Co., Ltd.) will be injected below the prevertebral fascia on the surface of longus colli muscle

Topiramate(Topiramate, Xi'an Yangsen Pharmaceutical Co., Ltd) will be started at a low dose and then increased gradually until optimally effective, side effects become intolerable, or the maximum recommended dose is reached. During the 4-week up-titration phase, the intention will increase dose weekly in 25 mg increments with the aim of reaching 50-100 mg/day. Ibuprofen((Fenbid, Tianjin Shike Pharmaceutical Co., Ltd)will be chosen as acute treatment, but no more than 10 times per month to avoid medication overuse headache.