Associations between suicide attempts and elevated bedtime salivary cortisol levels in bipolar disorder

Journal of Affective Disorders
Masoud KamaliMelvin G McInnis

Abstract

Hypothalamic-pituitary-adrenal (HPA) axis abnormalities have been reported in bipolar disorder and also in suicidal behavior, but few studies have examined the relationship between suicidal behaviors and the HPA axis function in bipolar disorder, attending to and minimizing confounding factors. We compare HPA axis activity in bipolar individuals with and without suicidal behavior and unaffected healthy controls through measurement of salivary cortisol. Salivary cortisol was collected for three consecutive days in 29 controls, 80 bipolar individuals without a history of suicide and 56 bipolar individuals with a past history of suicide. Clinical factors that affect salivary cortisol were also examined. A past history of suicide was associated with a 7.4% higher bedtime salivary cortisol level in bipolar individuals. There was no statistical difference between non-suicidal bipolar individuals and controls in bedtime salivary cortisol and awakening salivary cortisol was not different between the three groups. The measure of salivary cortisol was a home based collection by the study subjects and the retrospective clinical data was primarily based on their historical account. Bipolar individuals with a past history of suicidal behavi...Continue Reading

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