New York Heart Association Classification
| Class | Description |
|---|---|
| I | Patients with heart disease with no limitation of physical activity. |
| II | Patients with heart disease with slight limitation of physical activity. Ordinary activity produces symptoms, but no symptoms are produced at rest. |
| III | Patients with marked limitation of physical activity. Less than ordinary activity creates symptoms, but no symptoms are produced at rest. |
| IV | Patients cannot perform physical activity without symptoms. Symptoms may be produced at rest. |