Axonal damage in multiple sclerosis patients with high versus low expanded disability status scale score

Area of Science:

• Neurology
• Neuroimaging
• Pathophysiology

Background:

• The underlying reasons for varying disability levels in multiple sclerosis (MS) patients remain poorly understood.
• Investigating the pathophysiological basis of MS disability is crucial for targeted therapeutic strategies.

Purpose of the Study:

• To investigate if a more destructive disease process underlies greater disability in MS patients with similar lesion volume and disease duration.
• To differentiate the pathological basis of benign versus severe disability in multiple sclerosis.

Main Methods:

• Utilized magnetic resonance imaging (MRI) techniques, including magnetic resonance spectroscopy (MRS).
• Compared brain atrophy metrics and N-acetylaspartate (NAA) levels in normal-appearing white matter between patient cohorts.
• Assessed spinal cord atrophy in relation to disability severity.

Main Results:

• Severely disabled MS patients exhibited similar brain atrophy and cerebral white matter NAA levels compared to benign MS patients.
• A significant finding was greater spinal cord atrophy in the severely disabled cohort.
• These results indicate a dissociation between cerebral and spinal cord pathology in relation to disability.

Conclusions:

• The observed differences in spinal cord atrophy, contrasted with similar cerebral atrophy, suggest that disability progression in MS is not driven by a uniformly aggressive pathological process across the entire neuroaxis.
• Spinal cord pathology may play a more critical role in determining severe disability in MS than previously recognized.
• These findings highlight the importance of considering regional neurodegenerative processes in MS.