NYHA Classification

• 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