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Title: Altered corticostriatal functional connectivity in obsessive-compulsive disorder
Author: Harrison, Ben J.
Soriano Mas, Carles
Pujol Nuez, Jesús
Ortiz, Hector
López Solá, Marina
Hernández Ribas, Rosa
Deus, Joan
Alonso Ortega, María del Pino
Yücel, Murat
Pantelis, Christos
Menchón Magriñá, José Manuel
Cardoner, N. (Narcís)
Keywords: Ganglis basals
Escorça cerebral
Neurosi obsessiva
Basal ganglia
Cerebral cortex
Obsessive-compulsive disorder
Issue Date: 1-Nov-2009
Publisher: American Medical Association
Abstract: Context: neurobiological models of obsessive-compulsive disorder (OCD) emphasize disturbances in the function and connectivity of brain corticostriatal networks, or 'loops.' Although neuroimaging studies of patients have supported this network model of OCD, very few have applied measurements that are sensitive to brain connectivity features. Objective: using resting-state functional magnetic resonance imaging, we tested the hypothesis that OCD is associated with disturbances in the functional connectivity of primarily ventral corticostriatal regions, measured from coherent spontaneous fluctuations in the blood oxygenation level-dependent (BOLD) signal. Design: case-control cross-sectional study. Setting: hospital referral OCD unit and magnetic resonance imaging facility. Participants: a total of 21 patients with OCD (10 men, 11 women) and 21 healthy control subjects matched for age, sex, and estimated intelligence. Main outcome measures: voxelwise statistical parametric maps testing the strength of functional connectivity of 4 striatal seed regions of interest (dorsal caudate nucleus, ventral caudate/nucleus accumbens, dorsal putamen, and ventral putamen) with remaining brain areas. Results: for both groups, there was a clear distinction in the pattern of cortical connectivity of dorsal and ventral striatal regions, consistent with the notion of segregated motor, associative, and limbic corticostriatal networks. Between groups, patients with OCD had significantly increased functional connectivity along a ventral corticostriatal axis, implicating the orbitofrontal cortex and surrounding areas. The specific strength of connectivity between the ventral caudate/nucleus accumbens and the anterior orbitofrontal cortex predicted patients' overall symptom severity (r(2) = 0.57; P < .001). Additionally, patients with OCD showed evidence of reduced functional connectivity of the dorsal striatum and lateral prefrontal cortex, and of the ventral striatum with the region of the midbrain ventral tegmental area. Conclusions: this study directly supports the hypothesis that OCD is associated with functional alterations of brain corticostriatal networks. Specifically, our findings emphasize abnormal and heightened functional connectivity of ventrolimbic corticostriatal regions in patients with OCD.
Note: Reproducció del document publicat a:
It is part of: Archives of General Psychiatry, 2009, vol. 66, num. 11, p. 1189-1200
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ISSN: 0003-990X
Appears in Collections:Articles publicats en revistes (Ciències Clíniques)

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