New York Heart Association (NYHA) functional class

New York Heart Association (NYHA) functional classification
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Class I	Asymptomatic with greater than normal activity
Class II	Symptomatic* with greater than normal activity (climbing stairs)
Class III	Symptomatic with normal activity (walking)
Class IV	Symptomatic at rest

*Shortness of breath, chest pain, orthopnea (difficulty breathing when not in the upright position)