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.|