2.5-Year changes of connectivity dynamism are relevant for physical and cognitive deterioration in multiple sclerosis

Author:

Rocca Maria A123ORCID,D’Amore Giulia14,Valsasina Paola1,Tedone Nicolò1,Meani Alessandro1ORCID,Filippi Massimo5367ORCID

Affiliation:

1. Neuroimaging Research Unit, Division of Neuroscience, IRCCS San Raffaele Scientific Institute, Milan, Italy

2. Neurology Unit, IRCCS San Raffaele Scientific Institute, Milan, Italy/

3. Vita-Salute San Raffaele University, Milan, Italy

4. Neurology Unit, IRCCS San Raffaele Scientific Institute, Milan, Italy

5. Neuroimaging Research Unit, Division of Neuroscience, IRCCS San Raffaele Scientific Institute, Milan, Italy/Neurology Unit, IRCCS San Raffaele Scientific Institute, Milan, Italy

6. Neurorehabilitation Unit, IRCCS San Raffaele Scientific Institute, Milan, Italy

7. Neurophysiology Service, IRCCS San Raffaele Scientific Institute, Milan, Italy

Abstract

Background: In MS, functional connectivity (FC) dynamism may influence disease evolution. Objectives: The objective is to assess time-varying functional connectivity (TVFC) changes over time at 2.5-year follow-up in MS patients according to physical and cognitive worsening. Methods: We collected 3T magnetic resonance imaging (MRI) for TVFC assessment (performed using sliding-window analysis of centrality) and clinical evaluations at baseline and 2.5-year follow-up from 28 healthy controls and 129 MS patients. Of these, 79 underwent baseline and follow-up neuropsychological assessment. At 2.5 years, physical/cognitive worsening was defined according to disability/neuropsychological score changes. Results: At follow-up, 25/129 (19.3%) MS patients worsened physically and 14/79 (17.7%) worsened cognitively. At baseline, MS patients showed reduced TVFC versus controls. At 2.5-year follow-up, no TVFC changes were detected in controls. Conversely, TVFC decreased over time in parieto-temporal regions in stable MS patients and in default-mode network in worsened MS. In physically worsened MS, basal ganglia TVFC reductions were also found. Reduced TVFC over time in the putamen in physically worsened and reduced TVFC in the precuneus in cognitively worsened were significant versus stable MS. Discussion: At 2.5-year follow-up, default-mode network TVFC reductions were found in worsening MS. Moreover, reduced deep gray matter TVFC characterized physically worsened patients, whereas precuneus involvement characterized cognitively worsened MS patients.

Publisher

SAGE Publications

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