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Related Experiment Videos

Functional decline in Parkinson disease.

J Jankovic1, A S Kapadia

  • 1Department of Neurology, Baylor College of Medicine, Houston, TX, USA. josephj@bcm.tmc.edu

Archives of Neurology
|October 27, 2001
PubMed
Summary
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Parkinson disease (PD) shows variable functional decline, with older onset and postural instability-gait difficulty dominance predicting faster progression. Handwriting is the only symptom that does not notably deteriorate.

Area of Science:

  • Neurology
  • Neurodegenerative Diseases
  • Movement Disorders

Background:

  • Parkinson disease (PD) is a progressive neurodegenerative disorder characterized by motor and non-motor symptoms.
  • Understanding the differential rates of progression for various PD symptoms is crucial for effective patient management and therapeutic development.

Purpose of the Study:

  • To quantify the overall rate of functional decline in Parkinson disease.
  • To analyze the progression patterns of specific signs and symptoms associated with PD.

Main Methods:

  • Longitudinal study of 297 clinically diagnosed PD patients over an average of 6.36 years.
  • Multivariate mixed-effects models and regression analyses were used to assess symptom progression (Unified Parkinson's Disease Rating Scale - UPDRS) in relation to demographic variables and disease subtypes.

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  • Patients were categorized by age at onset and dominant symptom type (tremor-dominant vs. postural instability-gait difficulty-dominant).

    • Main Results:

    • The annual decline in total UPDRS scores was 1.34 (on state) and 1.58 (off state).
    • Older age at onset was associated with more rapid PD progression, particularly in mentation, freezing, and activities of daily living.
    • Postural instability-gait difficulty-dominant PD showed steeper UPDRS progression compared to tremor-dominant PD. Handwriting was the only UPDRS component that did not significantly deteriorate.

    Conclusions:

    • Parkinson disease exhibits a variable progression course across its diverse clinical manifestations.
    • The findings suggest distinct underlying biochemical or degenerative mechanisms for different PD symptoms.
    • Age at onset and dominant symptom subtype are significant predictors of disease progression rate.