Could a lidocaine shot in the head stop chronic migraines?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Age 18 years or above * Referred for diagnostic angiography * Diagnosis of intractable migraine * Written informed consent able to be obtained from subject Exclusion Criteria: * Baseline HIT-6 score less than 60 (severe) * Pregnant, breastfeeding, or unwilling to practice contraception during participation in the study * Presence of a condition or abnormality that in the opinion of the Investigator would compromise the safety of the patient or the quality of the data * Concomitant intracranial pathology (eg, intracranial malignancy) * Known hypersensitivity and/or contraindication to lidocaine or local anesthetics of the amide type * Taking chronic medications that, when co-administered with lidocaine and other local anesthetics, are at increased risk of developing methemoglobinemia (nitrates/nitrites, local anesthetics, antineoplastic agents, antibiotics, antimalarials, anticonvulsants, acetaminophen, metoclopramide, quinine, sulfasalazine) * Known contraindications for angiography (eg, ESRD not requiring hemodialysis). Patients with contrast allergy with be premeditated with diphenhydramine and steroids. * Contraindication to anesthetic agents used for conscious sedation/monitored anesthesia care (MAC) * Concurrent participation in another research protocol for investigation of an experimental therapy * Per DSA imaging, presence of a cerebrovascular pathology known to cause headache (eg, arteriovenous malformation, dural arteriovenous fistula) * Per DSA imaging, presence of anastomosis or anatomical variation (eg, branches of middle meningeal artery) that could lead to increased procedural risk * Per DSA imaging, lack of endovascular access to either middle meningeal artery, or origin of the middle meningeal artery other than from the external carotid artery * Known or suspected inability to adhere to study protocol or protocol requirements, as per discretion of the Investigator or treating provider