Abnormalities of white matter microstructure in unmedicated obsessive-compulsive disorder and changes after medication.

PloS One
Qing FanZeping Xiao

Abstract

Abnormalities of myelin integrity have been reported in obsessive-compulsive disorder (OCD) using multi-parameter maps of diffusion tensor imaging (DTI). However, it was still unknown to what degree these abnormalities might be affected by pharmacological treatment. To investigate whether the abnormalities of white matter microstructure including myelin integrity exist in OCD and whether they are affected by medication. Parameter maps of DTI, including fractional anisotropy (FA), axial diffusivity (AD), radial diffusivity (RD) and mean diffusivity (MD), were acquired from 27 unmedicated OCD patients (including 13 drug-naïve individuals) and 23 healthy controls. Voxel-based analysis was then performed to detect regions with significant group difference. We compared the DTI-derived parameters of 15 patients before and after 12-week Selective Serotonin Reuptake Inhibitor (SSRI) therapies. Significant differences of DTI-derived parameters were observed between OCD and healthy groups in multiple structures, mainly within the fronto-striato-thalamo-cortical loop. An increased RD in combination with no change in AD among OCD patients was found in the left medial superior frontal gyrus, temporo-parietal lobe, occipital lobe, striatum, ...Continue Reading

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Methods Mentioned

BETA
pharmacotherapy

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BET toolbox FSL
FSL
Linux
SPM
SPM8
eddycorrect

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