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Title:	Structural and Functional Brain Correlates of Cognitive Impairment in Euthymic Patients with Bipolar Disorder
Author:	Alonso Lana, Silvia; Goikolea, José Manuel; Bonnín, Caterina del Mar; Sarró, Salvador; Segura i Fàbregas, Bàrbara; Amann, Benedikt L.; Monté Rubio, Gemma C.; Moro, Noemi; Fernandez Corcuera, Paloma; Maristany, Teresa; Salvador, Raymond; Vieta i Pascual, Eduard, 1963-; Pomarol-Clotet, Edith; McKenna, Peter J.
Other authors:	Universitat de Barcelona
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 hypoactiva- tion 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.
Subject(s):	-Trastorn bipolar -Trastorns de la cognició -Psicologia cognitiva -Ressonància magnètica -Estudi de casos -Manic-depressive illness -Cognition disorders -Cognitive psychology -Magnetic resonance -Case studies
Rights:	cc-by (c) Alonso Lana, Silvia et al., 2016 http://creativecommons.org/licenses/by/3.0/es
Document type:	Article Article - Published version
Published by:	Public Library of Science (PLoS)
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