Higher cortisol levels may proceed a manic episode and are related to disease severity in patients with bipolar disorder.

Psychoneuroendocrinology
Monique T van den BergAnne T Spijker

Abstract

Regulation of the hypothalamic-pituitary-adrenal (HPA) axis is implicated in the pathogenesis of bipolar disorder (BD). However, the relationship between HPA-activity and disease severity is not fully elucidated. In this pilot study we aimed to explore the temporal relationship between HPA-activity and the risk of a manic episode in BD patients type I, by assessing long-term hair cortisol concentrations (HCC). Second, we explored the relation between HCC and the number of previous episodes. Hair samples were collected from 45 BD I patients in euthymic or manic state and compared to 17 controls. From each participant, two hair samples of 3 cm length were used to measure long-term cortisol, reflecting retrospect time frames of 1-3 months and 4-6 months respectively prior to sampling. HCC in the BD group was slightly higher than in the control group in both hair segments (p = 0.049 and 0.03; after adjustment for age, sex, BMI and hair washing frequency p = 0.222 and 0.139). A significant peak in hair cortisol was observed prior to a manic episode (p = 0.036). Furthermore, we found a positive correlation between the number of mood episodes HCC (p = 0.03). Our results indicate that long-term cortisol levels are slightly higher in BD...Continue Reading

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