Why a standard definition is needed

In part one of this series, Dr. Tesha Monteith and Dr. Jennifer Robblee discuss an international consensus definition for refractory migraine and why clearer criteria are needed.

Show citations:

Robblee J, Minen MT, Friedman BW, Cortel-LeBlanc MA, Cortel-LeBlanc A, Orr SL. 2025 Guideline Update to Acute Treatment of Migraine for Adults in the Emergency Department: The American Headache Society Evidence Assessment of Parenteral Pharmacotherapies. Headache. 2026;66(1):53-76. doi:10.1111/head.70016

Robblee J, Khan FA, Marmura MJ, et al. Reaching International Consensus on the Definition of Refractory Migraine Using the Delphi Method. Cephalalgia. 2025;45(9):3331024251367767. doi:10.1177/03331024251367767

Show transcript:

Dr. Tesha Monteith:

Hi, this is Tesha Monteith with the Neurology Minute. I've just been speaking with Jennifer Robblee about her exciting work defining refractory migraine with an international consensus, as well as her work with the American Headache Society on a guideline update for parental pharmacotherapies for migraine in the emergency department. Hi, Jennifer. Thanks again for coming on our Neurology Minute. Dr. Jennifer Robblee: Thank you so much for having me. I'm delighted to be here. Dr. Tesha Monteith: You've done a lot of work in the area of refractory migraine. Why don't you tell us why you felt there need to be clarification on the definition?

Dr. Jennifer Robblee:

Well, this is a patient population that I'm really passionate about. There's not enough research out there. We don't really know who these patients are, why they're not responding to treatment, and we don't know how to help them because we have no guidelines, obviously, since they're refractory to what we use for treating. So I thought it was really good to get an international group to standardize our definition and hopefully help move the research forward.

Dr. Tesha Monteith:

Why don't you tell us a little bit about the consensus definition

Dr. Jennifer Robblee:

So we came up with an international consensus definition for refractory migraine that was laid out the same way that migraine is, say, laid out in the ICHD-3 diagnostic manual, if you want to call it that. So we have different criteria on. So criterion A basically allowed for it to be episodic or chronic migraine. Criterion B had three subcriteria, so you needed to have at least two out of three of severe to very severe disability and/or a constant background headache and/or at least eight monthly migraine days. Criterion C was about the lack of response to treatment. And basically it says that you needed to have failure of all medication categories, and there is an extra one for an other in case any new treatments emerge before the diagnostic criteria get updated. And what we considered a, quote, unquote, failure was that you did not have a 50% improvement in monthly migraine days, or you had intolerable side effects, or you had an absolute contraindication. There is a caveat that you need to have at least four true lack of efficacies. And then the CGRP monoclonal antibody or gepant category and the onabotulinumtoxin toxin category both had to be a true lack of response. And of course, there's a criterion B to say that this should not be from another diagnosis.

Dr. Tesha Monteith:

Thanks so much, Jennifer.