Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/112259
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Type: Journal article
Title: Cortical abnormalities in bipolar disorder: an MRI analysis of 6503 individuals from the ENIGMA Bipolar Disorder Working Group
Author: Hibar, D.
Westlye, L.
Doan, N.
Jahanshad, N.
Cheung, J.
Ching, C.
Versace, A.
Bilderbeck, A.
Uhlmann, A.
Mwangi, B.
Krämer, B.
Overs, B.
Hartberg, C.
Abé, C.
Dima, D.
Grotegerd, D.
Sprooten, E.
Bøen, E.
Jimenez, E.
Howells, F.
et al.
Citation: Molecular Psychiatry, 2018; 23(4):932-942
Publisher: Nature Publishing Group
Issue Date: 2018
ISSN: 1359-4184
1476-5578
Statement of
Responsibility: 
DP Hibar ... BT Baune ... et al. for the ENIGMA Bipolar Disorder Working Group
Abstract: Despite decades of research, the pathophysiology of bipolar disorder (BD) is still not well understood. Structural brain differences have been associated with BD, but results from neuroimaging studies have been inconsistent. To address this, we performed the largest study to date of cortical gray matter thickness and surface area measures from brain magnetic resonance imaging scans of 6503 individuals including 1837 unrelated adults with BD and 2582 unrelated healthy controls for group differences while also examining the effects of commonly prescribed medications, age of illness onset, history of psychosis, mood state, age and sex differences on cortical regions. In BD, cortical gray matter was thinner in frontal, temporal and parietal regions of both brain hemispheres. BD had the strongest effects on left pars opercularis (Cohen's d=-0.293; P=1.71 × 10(-21)), left fusiform gyrus (d=-0.288; P=8.25 × 10(-21)) and left rostral middle frontal cortex (d=-0.276; P=2.99 × 10(-19)). Longer duration of illness (after accounting for age at the time of scanning) was associated with reduced cortical thickness in frontal, medial parietal and occipital regions. We found that several commonly prescribed medications, including lithium, antiepileptic and antipsychotic treatment showed significant associations with cortical thickness and surface area, even after accounting for patients who received multiple medications. We found evidence of reduced cortical surface area associated with a history of psychosis but no associations with mood state at the time of scanning. Our analysis revealed previously undetected associations and provides an extensive analysis of potential confounding variables in neuroimaging studies of BD.
Keywords: Brain; Cerebral Cortex; Frontal Lobe; Prefrontal Cortex; Temporal Lobe; Humans; Magnetic Resonance Imaging; Case-Control Studies; Bipolar Disorder; Psychotic Disorders; Age Factors; Sex Factors; Adolescent; Adult; Middle Aged; Female; Male; Young Adult; Neuroimaging; Gray Matter
Description: Published online 2 May 2017
Rights: © The Author(s) 2018. This work is licensed under a Creative Commons Attribution- NonCommercial-NoDerivs 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if thematerial is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http:// creativecommons.org/licenses/by-nc-nd/4.0/
RMID: 0030069741
DOI: 10.1038/mp.2017.73
Grant ID: http://purl.org/au-research/grants/nhmrc/1037196
http://purl.org/au-research/grants/nhmrc/1066177
Appears in Collections:Psychiatry publications

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