Intra-arterial Sphenopalatine Ganglion Block for Patients With Refractory Headache

No Results Available Drug: Ketorolac|Drug: Dexamethasone Number of Procedure-Related Adverse Events|Change in Number of Days of Headache in Subjects with Chronic Migraine|Proportion of Chronic Migraine Patients that achieve at least 50% reduction in days of headache frequency|Proportion of patients with Cluster Headache that achieve 50% reduction in median number of attacks per day|Change in number of days of facial pain for subjects with trigeminal neuralgia|Proportion of patients with trigeminal neuralgia that achieve at least 50% reduction in days of facial pain frequency All Phase 1 0 Other Allocation: N/A|Intervention Model: Single Group Assignment|Masking: None (Open Label)|Primary Purpose: Treatment 19-11021096 June 2023