Association between migraine and stroke in a large-scale epidemiological study of the United States

K. R. Merikangas, B. T. Fenton, S. H. Cheng, M. J. Stolar and N. Risch
Genetic Epidemiology Research Unit, Yale University School of Medicine, New Haven, Conn, USA. Kath@zeus.psych.yale.edu

OBJECTIVE: To examine the association between stroke and migraine in an epidemiological study. DATA SOURCES AND DESIGN: The National Health and Nutrition Examination Survey baseline and first follow-up data were used to investigate cross-sectional and longitudinal associations between headache/migraine and stroke. SETTING: Study participants from a national probability sample of the civilian noninstitutionalized population of the United States. MAIN OUTCOME MEASURE: Self-reported physician diagnosis of stroke. RESULTS: After controlling for established risk factors for stroke (hypertension, diabetes, heart disease, and gender), both migraine and severe nonspecific headache were associated with a significantly increased risk for stroke reported at follow-up. The risk for stroke associated with migraine decreased as the age at stroke increased. CONCLUSIONS: Our results strengthen previous evidence regarding a nonrandom association of both headache and migraine with stroke, particularly among young women. To our knowledge, this is the first systematic examination in a large-scale prospective epidemiological study of men and women with sufficient statistical power to test the association between migraine and stroke in women. Severe headache and migraine should be considered as risk factors for the development of stroke, particularly in the absence of other well-established stroke risk factors. Further investigation is required to identify the putative mechanisms underlying comorbidity of migraine and stroke.

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