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Published in: Brain Structure and Function 9/2022

10-05-2022 | Multiple Sclerosis | Original Article

Associations between corpus callosum damage, clinical disability, and surface-based homologous inter-hemispheric connectivity in multiple sclerosis

Authors: Andrew W. Russo, Kirsten E. Stockel, Sean M. Tobyne, Chanon Ngamsombat, Kristina Brewer, Aapo Nummenmaa, Susie Y. Huang, Eric C. Klawiter

Published in: Brain Structure and Function | Issue 9/2022

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Abstract

Axonal damage in the corpus callosum is prevalent in multiple sclerosis (MS). Although callosal damage is associated with disrupted functional connectivity between hemispheres, it is unclear how this relates to cognitive and physical disability. We investigated this phenomenon using advanced measures of microstructural integrity in the corpus callosum and surface-based homologous inter-hemispheric connectivity (sHIC) in the cortex. We found that sHIC was significantly decreased in primary motor, somatosensory, visual, and temporal cortical areas in a group of 36 participants with MS (29 relapsing–remitting, 4 secondary progressive MS, and 3 primary-progressive MS) compared with 42 healthy controls (cluster level, p < 0.05). In participants with MS, global sHIC correlated with fractional anisotropy and restricted volume fraction in the posterior segment of the corpus callosum (r = 0.426, p = 0.013; r = 0.399, p = 0.020, respectively). Lower sHIC, particularly in somatomotor and posterior cortical areas, was associated with cognitive impairment and higher disability scores on the Expanded Disability Status Scale (EDSS). We demonstrated that higher levels of sHIC attenuated the effects of posterior callosal damage on physical disability and cognitive dysfunction, as measured by the EDSS and Brief Visuospatial Memory Test-Revised (interaction effect, p < 0.05). We also observed a positive association between global sHIC and years of education (r = 0.402, p = 0.018), supporting the phenomenon of “brain reserve” in MS. Our data suggest that preserved sHIC helps prevent cognitive and physical decline in MS.
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Metadata
Title
Associations between corpus callosum damage, clinical disability, and surface-based homologous inter-hemispheric connectivity in multiple sclerosis
Authors
Andrew W. Russo
Kirsten E. Stockel
Sean M. Tobyne
Chanon Ngamsombat
Kristina Brewer
Aapo Nummenmaa
Susie Y. Huang
Eric C. Klawiter
Publication date
10-05-2022
Publisher
Springer Berlin Heidelberg
Published in
Brain Structure and Function / Issue 9/2022
Print ISSN: 1863-2653
Electronic ISSN: 1863-2661
DOI
https://doi.org/10.1007/s00429-022-02498-7

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