Chronic intractable migraine, also referred to as status migraine or status migrainosus, is a severe migraine that has continued for greater than 72 hours and has been refractory to usual therapies for migraine. When a patient experiences an intractable migraine, additional treatment is often necessary to break the cycle.
Symptoms of a chronic migraine occur at least 15 days in each month and for at least three consecutive months. A chronic migraine must also involve two of the following migraine characteristics for a minimum of eight days in a month: