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dc.contributor.authorBrownlee, Wallace Jen
dc.contributor.authorSolanky, Bhavanaen
dc.contributor.authorPrados, Ferranen
dc.contributor.authorYiannakas, Mariosen
dc.contributor.authorDa Mota, Patriciaen
dc.contributor.authorRiemer, Franken
dc.contributor.authorCardoso, Manuel Jorgeen
dc.contributor.authorOurselin, Sebastianen
dc.contributor.authorGolay, Xavieren
dc.contributor.authorGandini Wheeler-Kingshott, Claudiaen
dc.contributor.authorCiccarelli, Olgaen
dc.date.accessioned2019-09-10T23:31:31Z
dc.date.available2019-09-10T23:31:31Z
dc.date.issued2019-07en
dc.identifier.issn0022-3050
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/296753
dc.description.abstractOBJECTIVE: Sodium (23Na)-MRI is an emerging imaging technique to investigate in vivo changes in tissue viability, reflecting neuroaxonal integrity and metabolism. Using an optimised 23Na-MRI protocol with smaller voxel sizes and improved tissue contrast, we wanted to investigate whether brain total sodium concentration (TSC) is a biomarker for long-term disease outcomes in a cohort of patients with relapse-onset multiple sclerosis (MS), followed from disease onset. METHODS: We performed a cross-sectional study in 96 patients followed up ~ 15 years after a clinically isolated syndrome (CIS) and 34 healthy controls. Disease course was classified as CIS, relapsing-remitting MS or secondary progressive MS (SPMS). We acquired 1H-MRI and 23Na-MRI and calculated the TSC in cortical grey matter (CGM), deep grey matter, normal-appearing white matter (WM) and WM lesions. Multivariable linear regression was used to identify independent associations of tissue-specific TSC with physical disability and cognition, with adjustment for tissue volumes. RESULTS: TSC in all tissues was higher in patients with MS compared with healthy controls and patients who remained CIS, with differences driven by patients with SPMS. Higher CGM TSC was independently associated with Expanded Disability Status Scale (R2=0.26), timed 25-foot walk test (R2=0.23), 9-hole peg test (R2=0.23), Paced Auditory Serial Addition Test (R2=0.29), Symbol Digit Modalities Test (R2=0.31) and executive function (R2=0.36) test scores, independent of grey matter atrophy. CONCLUSIONS: Sodium accumulation in CGM reflects underlying neuroaxonal metabolic abnormalities relevant to disease course heterogeneity and disability in relapse-onset MS. TSC and should be considered as an outcome measure in future neuroprotection trials.
dc.description.sponsorshipThis study was funded by the United Kingdom MS Society and the Neurological Foundation of New Zealand and supported by the National Institute for Health Research (NIHR) University College London Hospitals (UCLH) Biomedical Research Centre.
dc.languageengen
dc.publisherBMJ
dc.rightsAll rights reserved
dc.rights.uri
dc.titleCortical grey matter sodium accumulation is associated with disability and secondary progressive disease course in relapse-onset multiple sclerosis.en
dc.typeArticle
prism.endingPage760
prism.issueIdentifier7en
prism.publicationDate2019en
prism.publicationNameJournal of Neurology, Neurosurgery and Psychiatryen
prism.startingPage755
prism.volume90en
dc.identifier.doi10.17863/CAM.43796
dcterms.dateAccepted2019-02-08en
rioxxterms.versionofrecord10.1136/jnnp-2018-319634en
rioxxterms.versionAM
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2019-07en
dc.contributor.orcidRiemer, Frank [0000-0002-3805-5221]
dc.identifier.eissn1468-330X
rioxxterms.typeJournal Article/Reviewen
cam.issuedOnline2019-04-04en
cam.orpheus.successThu Jan 30 10:39:21 GMT 2020 - Embargo updated*
rioxxterms.freetoread.startdate2019-04-01


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