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Stages A At risk of heart failure due to conditions such as hypertension, diabetes, coronary artery disease
B Pre-heart failure with no symptoms but evidence for structural heart disease including reduced ejection fraction, increased left ventricular wall thickness, valvular disease
C Symptomatic heart failure with structural heart disease and heart failure symptoms
D Advanced heart failure with marked symptoms despite attempts at optimization of guideline-directed medical therapy
New York Heart Association symptom classes I No symptoms
II Symptoms with moderate exertion
III Symptoms with mild exertion
IV Symptoms with minimal exertion or at rest
Ejection fraction categories Reduced: ≤ 40%
Mildly reduced: 41%–49%
Preserved: ≥ 50%
Improved: > 40% after initially being ≤ 40%