Prevalence of bipolar spectrum disorders in migraine patients

Abstract

Objectives: Comorbidity of migraine and mood disorders has long been recognized. Most of the studies have focused on the relationship between migraine and major depression with only few studies suggesting a special association between migraine and bipolar spectrum disorders. We aimed to evaluate the prevalence of bipolar disorder in migraine patients in a specialized headache outpatient clinic.
Methods: The sample consisted of 78 consecutive patients with migraine headache presenting to the specialized headache outpatient clinic in a Medical Faculty. Migraine diagnosis was established with the International Headache Society’s criteria for migraine. Patients were evaluated with Structured Clinical Interview for DSM-IV for mood disorders. Bipolar spectrum definition was broadened with the presence of Akiskal’s criteria for affective temperaments (cyclothymic, hyperthymic, irritable, and depressive).
Results: Patients in the bipolar spectrum comprised 10.3% (n=8) of the sample. 11 patients (14.1%) had a diagnosis of unipolar depression and 7 patients (9%) had a diagnosis of dysthymic disorder. 41% of the patients (n=32) had an affective temperament. Bipolar disorder was observed with increased frequency in this migraine sufferer population, supporting previous findings of increased prevalence of bipolar disorders in patients with migraine.
Conclusion: Increased frequency of affective temperaments might be considered in the context of a common pathophysiological background for migraine and bipolar disorders where these temperaments are sub-threshold presentations of mood disorders. Therefore, the definition of patients with comorbid migraine and bipolar disorder may serve as a more homogenic subgroup of mood disorders for further studies.