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    Structural and Functional Brain Correlates of Cognitive Impairment in Euthymic Patients with Bipolar Disorder

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    Author
    Alonso-Lana, S; Goikolea, JM; Bonnin, CM; Sarro, S; Segura, B; Amann, BL; Monte, GC; Moro, N; Fernandez-Corcuera, P; Maristany, T; ...
    Date
    2016-07-22
    Source Title
    PLoS One
    Publisher
    PUBLIC LIBRARY SCIENCE
    University of Melbourne Author/s
    ALONSO-LANA, SILVIA
    Affiliation
    Psychiatry
    Metadata
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    Document Type
    Journal Article
    Citations
    Alonso-Lana, S., Goikolea, J. M., Bonnin, C. M., Sarro, S., Segura, B., Amann, B. L., Monte, G. C., Moro, N., Fernandez-Corcuera, P., Maristany, T., Salvador, R., Vieta, E., Pomarol-Clotet, E. & McKenna, P. J. (2016). Structural and Functional Brain Correlates of Cognitive Impairment in Euthymic Patients with Bipolar Disorder. PLOS ONE, 11 (7), https://doi.org/10.1371/journal.pone.0158867.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/255031
    DOI
    10.1371/journal.pone.0158867
    Abstract
    INTRODUCTION: Cognitive impairment in the euthymic phase is a well-established finding in bipolar disorder. However, its brain structural and/or functional correlates are uncertain. METHODS: Thirty-three euthymic bipolar patients with preserved memory and executive function and 28 euthymic bipolar patients with significant memory and/or executive impairment, as defined using two test batteries, the Rivermead Behavioural Memory Test (RBMT) and the Behavioural Assessment of the Dysexecutive Syndrome (BADS), plus 28 healthy controls underwent structural MRI using voxel-based morphometry (VBM). Twenty-seven of the cognitively preserved patients, 23 of the cognitively impaired patients and 28 controls also underwent fMRI during performance of the n-back working memory task. RESULTS: No clusters of grey or white matter volume difference were found between the two patient groups. During n-back performance, the cognitively impaired patients showed hypoactivation compared to the cognitively preserved patients in a circumscribed region in the right dorsolateral prefrontal cortex. Both patient groups showed failure of de-activation in the medial frontal cortex compared to the healthy controls. CONCLUSIONS: Cognitive impairment in euthymic bipolar patients appears from this study to be unrelated to structural brain abnormality, but there was some evidence for an association with altered prefrontal function.

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