NYHA grading
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NYHA classification heart failure functional grading
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NYHA heart failure classification table
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NYHA Functional Classification of Heart Failure
The New York Heart Association (NYHA) classification is the standard system for grading the functional severity of heart failure based on symptom limitation during physical activity.
| Class | Limitation | Description |
|---|---|---|
| I | None | No limitation of physical activity. Ordinary activity does not cause HF symptoms (dyspnea, fatigue, palpitations). |
| II | Slight | Comfortable at rest, but ordinary physical activity results in HF symptoms. |
| III | Marked | Comfortable at rest, but less than ordinary activity causes HF symptoms. |
| IV | Severe | Unable to perform any physical activity without symptoms, or symptoms are present at rest. |
(Management of Heart Failure With Preserved Ejection Fraction, p. 5)
Key Points
- Symptoms referenced: dyspnea, fatigue, palpitations, angina
- Dynamic: a patient's class can improve or worsen over time with treatment or disease progression
- Subjective: classification relies on patient-reported symptom burden, so inter-observer variability exists
- Clinical utility:
- Guides initiation and escalation of medical therapy
- Determines eligibility for device therapy (e.g., ICD/CRT indicated in Class II–III with reduced EF)
- Used as an endpoint in heart failure clinical trials
- Informs transplant listing criteria
Relationship to ACC/AHA Staging
NYHA classes map approximately onto ACC/AHA stages:
| ACC/AHA Stage | Description | Corresponding NYHA |
|---|---|---|
| A | At risk, no structural disease | — |
| B | Structural disease, no symptoms | I |
| C | Structural disease with symptoms | I–IV |
| D | Refractory HF | IV |
ACC/AHA stages only progress forward; NYHA class can fluctuate with treatment response.
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