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Functional Classifications

The most common heart failure classification system is the New York Heart Association Function (NYHA) classification, which is based on symptom severity:

• Class 1 - No symptoms and no limitation in ordinary physical activity

• Class 2 - Mild symptoms and slight limitation during ordinary activity - comfortable at rest

• Class 3 - Marked limitation in activity due to symptoms, even during less-than-ordinary activity - comfortable only at rest

• Class 4 - Severe limitations - experiences symptoms even while at rest

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