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Published in: Neuroradiology 8/2017

01-08-2017 | Functional Neuroradiology

Normal appearing white matter permeability: a marker of inflammation and information processing speed deficit among relapsing remitting multiple sclerosis patients

Authors: Eldar Eftekhari, Seyed-Parsa Hojjat, Rita Vitorino, Timothy J. Carroll, Charles Grady Cantrell, Liesly Lee, Matthew W. Taylor, Sarah A. Morrow, Haddas Benhabib, Richard I. Aviv, Andrea Kassner

Published in: Neuroradiology | Issue 8/2017

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Abstract

Purpose

Blood-brain barrier breakdown (BBBB) occurs in relapsing remitting multiple sclerosis (RRMS). Relative recirculation (rR), a BBBB surrogate, may show inflammation undetectable by gadolinium. We compared normal appearing white matter (NAWM) rR in patients with and without disability measured with Symbol Digit Modalities Test and the Expanded Disability Status Scale (EDSS).

Methods

Thirty-nine RRMS patients were prospectively recruited and classified as impaired or non-impaired based on the SDMT and EDSS threshold ≥3. Significant demographic, MRI structural and regional rR characteristics were advanced into multivariate analysis to assess the association with impairment of cognition and EDSS. Bonferroni corrected p < 0.025 was applied to demographic and rR group comparisons; p < 0.05 was used in the final multivariate logistic regression.

Results

rR was higher in NAWM (p = 0.012), NAGM (p = 0.004), and basal ganglia (p = 0.007) in cognitively impaired versus non-impaired patients. The difference between NAWM and T2HL rR was significant in cognitively non-impaired patients and approximated that of T2HL in impairment (0.084 vs. 0.075, p = 0.008; 0.118 vs. 0.101, p = 0.091, respectively). After adjusting for confounders, rR elevation for NAWM (OR 1.777; 95% CI 1.068–2.956; p = 0.026), NAGM (OR 2.138; 1.100–4.157; p = 0.025), and basal ganglia (OR 2.192; 1.120–4.289; p = 0.022) remained significantly predictive of cognitive impairment. NAWM area under the curve (AUC) for cognitive impairment was 0.783. No significant group differences or associations were seen for rR and EDSS impairment. No NAGM and cortical lesion rR difference was present within any of the impaired or non-impaired groups.

Conclusion

rR elevation in NAWM, NAGM, and basal ganglia appears sensitive to cognitive impairment but not EDSS.
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Metadata
Title
Normal appearing white matter permeability: a marker of inflammation and information processing speed deficit among relapsing remitting multiple sclerosis patients
Authors
Eldar Eftekhari
Seyed-Parsa Hojjat
Rita Vitorino
Timothy J. Carroll
Charles Grady Cantrell
Liesly Lee
Matthew W. Taylor
Sarah A. Morrow
Haddas Benhabib
Richard I. Aviv
Andrea Kassner
Publication date
01-08-2017
Publisher
Springer Berlin Heidelberg
Published in
Neuroradiology / Issue 8/2017
Print ISSN: 0028-3940
Electronic ISSN: 1432-1920
DOI
https://doi.org/10.1007/s00234-017-1862-7

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