In the NYHA functional classification of heart failure, which class is characterized by symptoms occurring at rest or with minimal exertion?

Question

Accepted Answer

B. Class IV. ## NYHA Functional Classification of Heart Failure

**Key Point:** NYHA Class IV represents the most severe functional limitation, with symptoms present at rest or with minimal exertion, and patients unable to perform any physical activity without discomfort.

### NYHA Classification Table

| NYHA Class | Symptoms | Exercise Tolerance | Clinical Scenario |
| --- | --- | --- | --- |
| **Class I** | No symptoms | Normal; no limitation | Structural disease but no functional limitation |
| **Class II** | Symptoms with ordinary exertion | Slight limitation | Dyspnea on climbing 2+ flights of stairs |
| **Class III** | Symptoms with less than ordinary exertion | Marked limitation | Dyspnea on walking on level ground |
| **Class IV** | Symptoms at rest or minimal exertion | Severe limitation; unable to perform any activity | Orthopnea, PND, dyspnea at rest |

**High-Yield:** NYHA Class IV patients are often hospitalized and may require inotropic support or mechanical circulatory support. This is the most severe functional class and has the worst prognosis.

**Mnemonic:** "NYHA I–IV = None, Some, Marked, Severe" — progression of symptom severity with decreasing exercise tolerance.

### Clinical Correlation

**Clinical Pearl:** NYHA functional class is a subjective assessment and can change day-to-day based on medications, salt intake, and intercurrent illness. It is NOT the same as ejection fraction (EF) — a patient with EF 20% may be NYHA II if well-controlled, while another with EF 40% may be NYHA III if decompensated.

**Warning:** Do not confuse NYHA class with objective measures like EF or BNP. NYHA is purely symptom-based and reflects functional capacity, not anatomical severity.

Answer

A. Class II

Answer

C. Class I

Answer

D. Class III

In the NYHA functional classification of heart failure, which class is characterized by symptoms occurring at rest or with minimal exertion?

Explanation

NYHA Functional Classification of Heart Failure

NYHA Classification Table

Clinical Correlation

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NYHA Class	Symptoms	Exercise Tolerance	Clinical Scenario
Class I	No symptoms	Normal; no limitation	Structural disease but no functional limitation
Class II	Symptoms with ordinary exertion	Slight limitation	Dyspnea on climbing 2+ flights of stairs
Class III	Symptoms with less than ordinary exertion	Marked limitation	Dyspnea on walking on level ground
Class IV	Symptoms at rest or minimal exertion	Severe limitation; unable to perform any activity	Orthopnea, PND, dyspnea at rest