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Isolated cognitive relapses in multiple sclerosis.

Matteo Pardini1, Antonio Uccelli2, Jordan Grafman3

  • 1Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genoa, Genoa, Italy Magnetic Resonance Research Centre on Nervous System Diseases, University of Genoa, Genoa, Italy MS Centre, University College London Institute of Neurology, London, UK.

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|April 2, 2014
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Summary
This summary is machine-generated.

Isolated cognitive relapses (ICRs) in multiple sclerosis (MS) are not linked to mood changes but predict long-term cognitive decline. Identifying ICRs is crucial for understanding MS progression.

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Area of Science:

  • Neuroscience
  • Clinical Neurology

Background:

  • Cognitive impairment is a known complication of multiple sclerosis (MS) relapses.
  • The significance of isolated cognitive relapses (ICRs), occurring without new sensorimotor symptoms, is not well understood.
  • This study investigates the impact of ICRs on cognitive function in relapsing-remitting MS.

Purpose of the Study:

  • To explore the relationship between isolated cognitive relapses (ICRs) and long-term cognitive decline in relapsing-remitting MS patients.
  • To assess the association between ICRs and subjective cognitive performance evaluations.
  • To establish an operational definition for ICRs in the context of MS.

Main Methods:

  • Cognitive performance of 99 relapsing-remitting MS patients was analyzed over four evaluations (baseline, t₁, t₂, t₃).
  • A meaningful cognitive change was defined as a transient ≥4-point reduction in Symbol Digit Modalities Test score at t₁ compared to baseline and t₂.
  • t₁ was defined as an evaluation within 2 weeks of a gadolinium-enhancing MRI scan.

Main Results:

  • Isolated cognitive relapses (ICRs) were identified in 17 patients.
  • ICRs were not associated with subjective cognitive deficits or depression.
  • Patients experiencing an ICR showed significantly reduced cognitive performance in follow-up evaluations compared to those without ICRs.

Conclusions:

  • Isolated cognitive relapses (ICRs) in MS are not linked to mood or self-reported cognitive changes.
  • The study proposes an operational definition for ICRs.
  • ICRs may serve as an important indicator of future cognitive decline in multiple sclerosis.