Publication
Title
Limbic and callosal white matter changes in euthymic bipolar I disorder : an advanced diffusion magnetic resonance imaging tractography study
Author
Abstract
Background White matter microstructural changes detected using diffusion tensor imaging have been reported in bipolar disorder. However, findings are heterogeneous, which may be related to the use of analysis techniques that cannot adequately model crossing fibers in the brain. We therefore sought to identify altered diffusion anisotropy and diffusivity changes using an improved high angular resolution fiber-tracking technique. Methods Diffusion magnetic resonance imaging data was obtained from 35 prospectively confirmed euthymic bipolar disorder type 1 patients (age 2259) and 43 control subjects (age 2259) drawn from a sample of 120 age- and gender-matched demographically similar case-control pairs. Tractography using a constrained spherical deconvolution approach to account for crossing fibers was implemented. Changes in fractional anisotropy, mean diffusivity, axial diffusivity, and radial diffusivity between patient and control groups in subdivisions of the corpus callosum, cingulum, and fornix were measured as indicators of trait differences in white matter microstructural organization in bipolar disorder. Results Patients had significantly reduced fractional anisotropy and increased mean diffusivity and radial diffusivity in all divisions of the corpus callosum, left fornix, and subgenual cingulum compared with control subjects. Axial diffusivity was increased in the fornix bilaterally and right dorsal-anterior cingulum. Conclusions By using an improved fiber-tracking method in a clinically homogeneous population, we were able to localize trait diffusivity changes to specific subdivisions of limbic fiber pathways, including the fornix. Our findings extend previous reports of altered limbic system microstructural disorganization as a trait feature of bipolar disorder.
Language
English
Source (journal)
Biological psychiatry. - New York, N.Y.
Publication
New York, N.Y. : 2013
ISSN
0006-3223
Volume/pages
73:2(2013), p. 194-201
ISI
000312266800017
Full text (Publisher's DOI)
Full text (publisher's version - intranet only)
UAntwerpen
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Publication type
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Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
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Creation 17.12.2012
Last edited 14.09.2017
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