Fatigue predicts disease worsening in relapsing-remitting multiple sclerosis patients

Abstract

Background:

It is unclear whether fatigue is a consequence or a predictive trait of disease worsening.

Objective:

To investigate the predictive value of fatigue toward conversion to confirmed moderate–severe disability in patients with relapsing-remitting multiple sclerosis (RRMS).

Methods:

We retrospectively selected from the Comprehensive Longitudinal Investigations in MS at the Brigham and Women’s Hospital (CLIMB) study cohort RRMS patients who converted to confirmed (⩾2 years) Expanded Disability Status Scale (EDSS) score ⩾3 within a follow-up period ⩾3 years. We contrasted the Modified Fatigue Impact Scale (MFIS) score of 33 converters, obtained at least 1 year before conversion to EDSS ⩾3, with that of 33 non-converter RRMS patients matched for baseline characteristics.

Results:

Total MFIS score was higher in converter versus non-converter MS patients (median 37 vs 13; p < 0.0001). EDSS and Center for Epidemiological Studies Depression scale (CES-D) scores were also higher in the converters (median EDSS 1.5 vs 0, p < 0.0001; median CES-D 30 vs 24, p < 0.0001) and were both associated with MFIS score (EDSS: rho = 0.42, p = 0.0005; CES-D: rho = 0.72, p < 0.0001). After adjusting for EDSS and CES-D in multivariate analysis, MFIS remained a significant predictor of subsequent conversion to confirmed EDSS ⩾3.

Conclusion:

Fatigue is a promising indicator of risk for conversion to confirmed moderate–severe disability in RRMS patients.

Keywords

Fatigue progressive multiple sclerosis neuropsychology quality of life Expanded Disability Status Scale disability

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