Inability to perform physical activity with discomfo falls under-
Ref: KV Krishna Das - Clinical Medicine 4th Edition pg no:170 NYHA Functional Classification Class I Dyspnea occurring at heavy, but accustomed activity Class II Dyspnea occurring on moderate exeion Class III Dyspnea during mild exeion or during daily routine activities Class IV Dyspnea even at rest.
NYHAclassl
2
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4
C.V.S