Fatigue in multiple sclerosis compared with chronic fatigue syndrome: A quantitative assessment

Area of Science:

• Neurology
• Rehabilitation Medicine
• Neuroscience

Background:

• Fatigue is a prevalent and poorly understood symptom in multiple sclerosis (MS).
• Objective measurement of fatigue in MS is challenging, limiting therapeutic development.

Purpose of the Study:

• To develop and validate a quantitative method for measuring fatigue in MS patients.
• To investigate the relationship between fatigue, pyramidal tract involvement, and disease activity in MS.

Main Methods:

• A computerized method was used to calculate a fatigue index (FI) based on muscle strength decay.
• Thirty MS patients (with and without pyramidal signs) were assessed, along with CFS patients and healthy controls.
• Patients were evaluated during relapse and at a follow-up period.

Main Results:

• The fatigue index (FI) was significantly higher in MS patients compared to CFS patients and healthy controls.
• MS patients with pyramidal tract involvement exhibited a higher FI than those without.
• Fatigue worsened during relapses affecting the pyramidal tract, but not other neurological systems.

Conclusions:

• Quantitative measurement of fatigue in MS is feasible using the developed fatigue index.
• Pyramidal tract dysfunction is a key contributor to increased fatigability in multiple sclerosis.
• This quantitative approach may aid in understanding MS-related fatigue and guiding interventions.