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Related Experiment Videos

The relationship between diffuse axonal damage and fatigue in multiple sclerosis.

Maria Carmela Tartaglia1, Sridar Narayanan, Simon J Francis

  • 1Department of Neurology and Neurosurgery, Montreal Neurological Institute and Hospital, Montreal, Quebec, Canada.

Archives of Neurology
|February 18, 2004
PubMed
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Multiple sclerosis (MS) fatigue is linked to brain axonal damage. Proton magnetic resonance spectroscopy revealed lower N-acetylaspartate levels in MS patients with severe fatigue, indicating a central nervous system cause.

Area of Science:

  • Neuroscience
  • Neurology
  • Biomedical Imaging

Background:

  • Fatigue is a prevalent and debilitating symptom in multiple sclerosis (MS).
  • Evidence suggests a central nervous system origin for MS-related fatigue.
  • This study investigated the association between diffuse cerebral axonal damage and fatigue in MS patients.

Purpose of the Study:

  • To evaluate the correlation between central brain N-acetylaspartate (NAA) levels and fatigue severity in MS.
  • To determine if axonal damage, measured by NAA, is a significant factor in MS fatigue.

Main Methods:

  • Proton magnetic resonance spectroscopy (MRS) was employed to noninvasively assess axonal damage in the brains of MS patients.
  • Data from 73 MS patients, including MRS imaging and Fatigue Severity Scale (FSS) scores, were analyzed.

Related Experiment Videos

  • N-acetylaspartate-creatine ratio (NAA/Cr) was calculated as a marker of neuronal integrity.

    • Main Results:

    • The N-acetylaspartate-creatine ratio (NAA/Cr) was significantly lower in MS patients reporting high fatigue levels compared to those with low fatigue (P =.003).
    • This reduction in NAA/Cr was independent of disease severity (Kurtzke Expanded Disability Status Scale), lesion load, age, and disease duration.
    • A significant negative linear correlation was observed between FSS scores and NAA/Cr (Spearman rho = -0.361, P =.02), indicating more fatigue with lower NAA/Cr.

    Conclusions:

    • Widespread axonal dysfunction in the brain is associated with fatigue in multiple sclerosis.
    • Altered brain function and increased neural pathway recruitment may contribute to the perception of increased effort in MS patients.
    • Proton MRS offers a noninvasive method to explore the neurobiological underpinnings of MS fatigue.