Hoehn and Yahr scale
Encyclopedia
The Hoehn and Yahr scale is a commonly used system for describing how the symptoms of Parkinson's disease
progress. It was originally published in 1967 in the journal Neurology by Melvin Yahr and Margaret Hoehn. The original scale included stages 1 through 5. Since then, stage 0 has been added, and stages 1.5 and 2.5 have been proposed. This modified scale allocates stages from 0 to 5 to indicate the relative level of disability.
Parkinson's disease
Parkinson's disease is a degenerative disorder of the central nervous system...
progress. It was originally published in 1967 in the journal Neurology by Melvin Yahr and Margaret Hoehn. The original scale included stages 1 through 5. Since then, stage 0 has been added, and stages 1.5 and 2.5 have been proposed. This modified scale allocates stages from 0 to 5 to indicate the relative level of disability.
- Stage 0: No signs of disease.
- Stage 1: Unilateral symptoms only.
- Stage 1.5: Unilateral and axial involvement.
- Stage 2: Bilateral symptoms. No impairment of balance.
- Stage 2.5: Mild bilateral disease with recovery on pull test.
- Stage 3: Balance impairment. Mild to moderate disease. Physically independent.
- Stage 4: Severe disability, but still able to walk or stand unassisted.
- Stage 5: Needing a wheelchair or bedridden unless assisted.