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Validation of the Modified Fatigue Impact Scale in Parkinson's disease

Dawn M Schiehser1, Catherine R Ayers, Lin Liu

  • 1Research Service, VA San Diego Healthcare System, San Diego, CA 92161, USA. dschiehser@ucsd.edu

Parkinsonism & Related Disorders
|December 19, 2012
PubMed
Abstract

Insights

The Modified Fatigue Impact Scale (MFIS) effectively measures fatigue's impact on physical, cognitive, and psychosocial functioning in Parkinson's disease (PD) patients. This validated tool aids in assessing daily life challenges for individuals with PD.

Area of Science:

  • Neurology
  • Psychology

Background:

  • Fatigue is a prevalent and impactful symptom in Parkinson's disease (PD).
  • Existing multidimensional scales for fatigue impact lack validation in the PD population.
  • Assessing fatigue's effect on daily functioning is crucial for managing PD.

Purpose of the Study:

  • To validate the Modified Fatigue Impact Scale (MFIS) in nondemented Parkinson's disease patients.
  • To assess the MFIS's reliability and validity in measuring fatigue's impact on physical, cognitive, and psychosocial functioning.
  • To provide a reliable tool for clinicians and researchers studying fatigue in PD.

Main Methods:

  • 100 nondemented PD patients completed the MFIS, PANAS-X, and other functional measures.
  • Principal Component Analysis (PCA) and item analysis (Cronbach's alpha) were used for structural validity and internal consistency.
  • Correlational analyses assessed convergent and divergent validity with related scales.

Main Results:

  • PCA identified two MFIS subscales: cognitive and physical/psychosocial.
  • High internal consistency was found for all MFIS items and subscales.
  • The MFIS demonstrated strong convergent validity with the PANAS-X fatigue subscale and adequate divergent validity.

Conclusions:

  • The MFIS is a valid multidimensional measure for assessing fatigue's impact in PD patients without dementia.
  • The validated MFIS can evaluate effects on cognitive and physical/social functioning.
  • This scale offers a valuable instrument for understanding and managing fatigue in Parkinson's disease.

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