NYHA Functional Class
Class I
Patients with no limitation of activities; they suffer no symptoms from ordinary activities.
Class II
Patients with slight, mild limitation of activity; they are comfortable with rest or with mild exertion.
Class III
Patients with marked limitation of activity; they are comfortable only at rest.
Class IV
Patients who should be at complete rest, confined to bed or chair; any physical activity brings on discomfort and symptoms occur at rest.
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