A. Overview 2. Grades of CHF I(A): no symptoms II B): physical activities were limited and symptoms could be induced by general activity I(C): physical activities were markedly limited TV(D): symptoms appear even at restA. Overview 2. Grades of CHF Ⅰ(A): no symptoms Ⅱ(B): physical activities were limited and symptoms could be induced by general activity Ⅲ(C): physical activities were markedly limited Ⅳ(D): symptoms appear even at rest