ACCF/AHA stages of HF | NYHA functional classification | ||
A | At high risk for HF but without structural heart disease or symptoms of HF | None | |
B | Structural heart disease but without signs or symptoms of HF | I | No limitation of physical activity. Ordinary physical activity does not cause symptoms of HF. |
C | Structural heart disease with prior or current symptoms of HF | I | No limitation of physical activity. Ordinary physical activity does not cause symptoms of HF. |
II | Slight limitation of physical activity. Comfortable at rest, but ordinary physical activity results in symptoms of HF. | ||
III | Marked limitation of physical activity. Comfortable at rest, but less than ordinary activity causes symptoms of HF. | ||
IV | Unable to carry on any physical activity without symptoms of HF, or symptoms of HF at rest. | ||
D | Refractory HF requiring specialized interventions | IV | Unable to carry on any physical activity without symptoms of HF, or symptoms of HF at rest. |
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