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Abstract #0236

Longitudinal Changes of Functional Connectivity Dynamism Are Relevant for Disability Worsening in Multiple Sclerosis: A 2.5-Year Study

Paola Valsasina1, Giulia d'Amore1,2, Paolo Preziosa1,2,3, Monica Margoni1,2, Massimo Filippi1,2,3,4,5, and Maria Assunta Rocca1,2,3
1Neuroimaging Research Unit, Division of Neuroscience, IRCCS San Raffaele Scientific Institute, Milan, Italy, 2Neurology Unit, IRCCS San Raffaele Scientific Institute, Milan, Italy, 3Vita-Salute San Raffaele University, Milan, Italy, 4Neurorehabilitation Unit, IRCCS San Raffaele Scientific Institute, Milan, Italy, 5Neurophysiology Service, IRCCS San Raffaele Scientific Institute, Milan, Italy

Synopsis

Keywords: Brain Connectivity, Multiple SclerosisHere, we investigated changes in time-varying functional connectivity over 2.5 years of follow-up in 129 multiple sclerosis patients and their association with disability progression. At follow-up, 25/129 (19.3%) patients worsened clinically. At baseline, multiple sclerosis patients showed reduced time-varying functional connectivity vs controls in orbitofrontal, cerebellar, precuneal and thalamic regions. At 2.5-year follow-up, patients exhibited widespread reduction of time-varying functional connectivity over time. Such a pattern was confirmed when looking at clinically stable patients. Conversely, clinically worsened patients presented peculiar reductions of time-varying functional connectivity in default-mode network areas and in basal ganglia, this latter significant at time-by-group interaction analysis.

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