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Functional assessment of pulmonary arterial hypertension
| NYHA Class | WHO Class | Activity Limitations |
|---|---|---|
| 1 | I | None |
| 2 | II | Sight limitation of activity |
| 3 | III | Marked limitation of activity |
| 4 | IV | Symptoms with any activity or at rest; discomfort is increased by any physical activity |
NYHA: New York Heart Association; WHO: World Health Organization.
