A retrospective review of clopidogrel as primary therapy for migraineurs with right to left shunt lesions.

BACKGROUND: The association of patient foramen ovale (PFO) and migraine headache (migraine) with aura (MA) is well established. Current research suggests a mechanistic link between platelet activation, paradoxical embolization and migraine in some patients.
METHODS: Clopidogrel, a platelet inhibitor, was added to existing migraine therapy, as a 4-week open-label trial in 15 women, aged 16-56 years, with severe migraine and documented right to left shunt (RLS).
RESULTS: 13/15 had > 50% reduction or complete elimination of migraine symptoms. After completing the trial period, five responders remain on clopidogrel with ongoing benefit at 11.9 ± 4.5 months (6.5-20), one stopped clopidogrel because of side effects. Nine other responders underwent PFO closure and clopidogrel discontinuation. Eight of nine have had ongoing benefit.
CONCLUSIONS: Clopidogrel may have a primary prophylactic role in migraine/RLS patients, but may also help select candidates who would benefit from PFO closure. A randomized clinical trial is being established. © International Headache Society 2014 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav.