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The American Heart Association (AHA) classification system categorizes heart failure based on the severity of symptoms. Class III indicates that patients experience significant limitations in physical activity; they are comfortable at rest but suffer from fatigue, palpitations, or shortness of breath with minimal exertion. Class IV, on the other hand, signifies that patients are unable to engage in physical activity without discomfort and may have symptoms even at rest, indicating a more severe form of heart failure.

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