Modified Hoehn and Yahr Scale for Parkinson’s Disease
Why Use
Provides a quick and standardized method to classify PD severity, ensuring consistency across clinical and research settings. Facilitates longitudinal tracking of motor symptom progression.
When to Use
Use to assess the severity and progression of Parkinson disease (PD) in clinical or research settings. Can also be applied to atypical parkinsonian disorders, such as dementia with Lewy bodies and progressive supranuclear palsy.
Formula
Pearls / Pitfalls
Heavily weighted toward postural instability and may not fully capture other motor impairments. Does not assess non-motor symptoms (e.g., cognitive decline, mood disorders, autonomic dysfunction); additional tools may be needed for a comprehensive evaluation. The modified scale improves upon the original by better differentiating early disease progression.
Advice
In the original study, stages 1–3 were considered minimally disabling, while stages 4 and 5 were classified as severe disability. Higher stages strongly correlate with motor impairment, increased fall risk, and reduced quality of life. While no specific management recommendations exist based on staging alone, it may guide clinical decision-making, including: Evaluating fall risk and initiating physical and/or occupational therapy. Assessing caregiver burden and the need for support services. Adjusting medications as needed. Discussing the potential for deep brain stimulation (DBS). Initiating advanced care planning, including palliative care, home health services, or long-term care.
More Information
Interpretation: Higher stage indicates higher degree of disability.