New York Heart Association Functional Classification
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The New York Heart Association (NYHA) Functional Classification provides a simple way of classifying the extent of heart failure. It places patients in one of four categories based on how much they are limited during physical activity:
| I | No symptoms and no limitation in ordinary physical activity. |
| II | Mild symptoms and slight limitation during ordinary activity. Comfortable at rest. |
| III | Marked limitation in activity due to symptoms, even during less-than-ordinary activity. Comfortable only at rest. |
| IV | Severe limitations. Experiences symptoms even while at rest. |