ACC/AHA stages of heart failure10	NYHA functional classifications for heart failure18
A: high risk of heart failure; no underlying structural cardiac disease (e.g., hypertension, diabetes, hyperlipidemia)	No correlation
B: asymptomatic structural heart disease (e.g., left ventricular hypertrophy)	I: no limitation of patient activities; ordinary physical activity causes no symptoms
C: structural heart disease with past or current symptoms of heart failure	II: slight or mild limitation of activity; comfortable at rest and with mild exertion
	III: marked limitation of activity; comfortable only at rest
D: refractory heart failure	IV: need for complete rest and confined to bed or chair; discomfort with any physical activity; symptoms occur at rest