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NYHA: New York Heart Association NYHA Class Symptoms
I No symptoms and no limitation in ordinary physical activity, e.g. no shortness of breath when walking, climbing stairs etc.
II Mild symptoms (mild shortness of breath) and slight limitation during ordinary activity.
Ill Marked limitation in activity due to symptoms, even during less-than-ordinary activity, e.g. walking short distances (20-100 m). Comfortable only at rest.
IV Severe limitations. Experiences symptoms even while at rest. Mostly bedbound patients.