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Lookup NU author(s): Dr Stuart Watson,
Emeritus Professor Nicol Ferrier,
Professor Allan Young
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Objective: Basal levels of glucocorticoids, such as cortisol, are generally unaltered in bipolar disorder. However, neuroendocrine tests of glucocorticoid receptor (GR) function such as the dexamethasone suppression test (DST) are frequently abnormal. Neuropsychological impairment is well documented in healthy volunteers after administration of glucocorticoids and in patients with bipolar affective disorder. This suggests a potential link between neuropsychological and hypothalamic-pituitary-adrenal axis function. We examined the hypothesis that neuropsychological impairment in bipolar disorder is associated with abnormal GR function. Methods: Seventeen euthymic bipolar patients and 16 controls completed tests of verbal declarative and working memory (WM) tests and the DST. The correlation between neuroendocrine and neuropsychological function was examined. Results: Bipolar patients made significantly more errors of omission and commission on the WM paradigm and demonstrated impaired verbal recognition memory. Patients' post-dexamethasone cortisol correlated with WM commission errors (rs = 0.64, p = 0.0006). No such relationship was evident in controls. Conclusion: Deficits in declarative memory and WM are evident in patients with bipolar disorder. The deficit in retrieval accuracy from WM appears to be correlated with abnormal GR function. © Blackwell Munksgaard, 2006.
Author(s): Watson S, Thompson JM, Ritchie JC, Ferrier IN, Young AH
Publication type: Article
Publication status: Published
Journal: Bipolar Disorders
Print publication date: 01/02/2006
ISSN (print): 1398-5647
ISSN (electronic): 1399-5618
Publisher: Wiley-Blackwell Publishing, Inc.
PubMed id: 16411985
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