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Cognitive dysfunction characteristics of multiple sclerosis with aging.

Lucía Vidorreta-Ballesteros1, Jordi A Matias-Guiu1, Alfonso Delgado-Álvarez1

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Cognitive impairment in multiple sclerosis (MS) primarily affects attention and processing speed across all ages. While processing speed deficits lessen with age, other cognitive issues become more prominent in older MS patients.

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Area of Science:

  • Neurology
  • Neuropsychology
  • Gerontology

Background:

  • Multiple Sclerosis (MS) is a chronic neurological disease.
  • Cognitive impairment is a common and significant comorbidity in MS.
  • Understanding age-related cognitive changes in MS is crucial for patient care.

Purpose of the Study:

  • To investigate the characteristics of cognitive impairment in older individuals with MS.
  • To compare cognitive profiles across different age groups and neurological conditions.
  • To identify age-specific patterns of cognitive dysfunction in MS.

Main Methods:

  • A cross-sectional study utilizing a comprehensive neuropsychological protocol.
  • Inclusion of multiple comparison groups: young MS vs. healthy controls (HC), old MS vs. HC, young MS vs. old MS, MS vs. Alzheimer's disease (AD), and MS vs. Parkinson's disease (PD).
  • Application of the ICCoDiMS criteria for defining cognitive impairment in MS.

Main Results:

  • Cognitive impairment was more frequent in young MS patients (70.8%) compared to older MS patients (52.2%).
  • Attention and processing speed were the most frequently impaired domains, particularly in younger MS patients.
  • Older MS patients showed greater impairment in episodic memory and executive functions compared to younger counterparts, while processing speed deficits were less pronounced.

Conclusions:

  • The cognitive profile in MS is characterized by attention and processing speed deficits throughout the lifespan.
  • Cognitive impairment patterns evolve with age, with processing speed deficits decreasing and other domain impairments becoming more relevant in older individuals.
  • These age-related differences suggest distinct pathophysiological mechanisms warranting further investigation.