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Brain structure and symptom dimension relationships in obsessive-compulsive disorder: a voxel-based morphometry study

Gilbert, Andrew R., Mataix-Cols, David, Almeida, Jorge R. C., Lawrence, Natalia Sophie, Nutche, Jeffrey, Diwadkar, Vaibhav, Keshavan, Matcheri S. and Phillips, Mary Louise 2008. Brain structure and symptom dimension relationships in obsessive-compulsive disorder: a voxel-based morphometry study. Journal of Affective Disorders 109 (1-2) , pp. 117-126. 10.1016/j.jad.2007.12.223

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Background Obsessive–compulsive disorder (OCD) is a clinically heterogenous disorder characterized by temporally stable symptom dimensions. Past inconsistent results from structural neuroimaging studies of OCD may have resulted from the effects of these specific symptom dimensions as well as other socio-demographic and clinical variables upon gray matter (GM) volume. Methods GM volume was measured in 25 adult OCD patients and 20 adult healthy controls using voxel-based morphometry (VBM), controlling for age and total brain GM volume. Univariate and multivariate regression analyses were carried out between regions of GM difference and age, age of onset, medication load, OCD severity, depression severity, and separate symptom dimension scores. Results Significant GM volumetric differences in OCD patients relative to controls were found in dorsal cortical regions, including bilateral BA6, BA46, BA9 and right BA8 (controls > patients), and bilateral midbrain (patients > controls). Stepwise regression analyses revealed highly significant relationships between greater total OCD symptom severity and smaller GM volumes in dorsal cortical regions and larger GM volumes in bilateral midbrain. Greater age was independently associated with smaller GM volumes in right BA6, left BA9, left BA46 and larger GM volumes in right midbrain. Greater washing symptom severity was independently associated with smaller GM volume in right BA6, while there was a trend association between greater hoarding symptom severity and lower GM volume in left BA6. Limitations The sample was relatively small to examine the relationship between symptom scores and GM volumes. Multiple patients were taking medication and had comorbid disorders. Conclusions These analyses suggest dorsal prefrontal cortical and bilateral midbrain GM abnormalities in OCD that appear to be primarily driven by the effects of total OCD symptom severity. The results regarding the relationship between GM volumes and symptom dimension scores require examination in larger samples.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Subjects: R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Uncontrolled Keywords: obsessive–compulsive disorder (OCD), symptom dimensions, neuroimaging, voxel-based morphometry (VBM)
Publisher: Elsevier
ISSN: 0165-0327
Last Modified: 10 Oct 2017 14:10

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