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Acta Neurol Scand. 2013 Nov;128(5):328-35. doi: 10.1111/ane.12121. Epub 2013 Mar 6.

Resting-state connectivity of pre-motor cortex reflects disability in multiple sclerosis.

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1
Danish Research Centre for Magnetic Resonance, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark.

Abstract

OBJECTIVE:

To characterize the relationship between motor resting-state connectivity of the dorsal pre-motor cortex (PMd) and clinical disability in patients with multiple sclerosis (MS).

MATERIALS AND METHODS:

A total of 27 patients with relapsing-remitting MS (RR-MS) and 15 patients with secondary progressive MS (SP-MS) underwent functional resting-state magnetic resonance imaging. Clinical disability was assessed using the Expanded Disability Status Scale (EDSS). Independent component analysis was used to characterize motor resting-state connectivity. Multiple regression analysis was performed in SPM8 between the individual expression of motor resting-state connectivity in PMd and EDSS scores including age as covariate. Separate post hoc analyses were performed for patients with RR-MS and SP-MS.

RESULTS:

The EDSS scores ranged from 0 to 7 with a median score of 4.3. Motor resting-state connectivity of left PMd showed a positive linear relation with clinical disability in patients with MS. This effect was stronger when considering the group of patients with RR-MS alone, whereas patients with SP-MS showed no increase in coupling strength between left PMd and the motor resting-state network with increasing clinical disability. No significant relation between motor resting-state connectivity of the right PMd and clinical disability was detected in MS.

CONCLUSIONS:

The increase in functional coupling between left PMd and the motor resting-state network with increasing clinical disability can be interpreted as adaptive reorganization of the motor system to maintain motor function, which appears to be limited to the relapsing-remitting stage of the disease.

KEYWORDS:

dorsal pre-motor cortex; functional imaging; magnetic resonance imaging; motor network; multiple sclerosis; resting-state connectivity

PMID:
23461607
DOI:
10.1111/ane.12121
[Indexed for MEDLINE]
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