概述-心功能分级 根据症状对心功能分级: Class l: no limitation is experienced in any activities; no symptoms from ordinary activities Class l: slight, mild limitation of activity; the patient is comfortable at rest or with mild exertion Class l: marked limitation of any activity; the patient is comfortable only at rest Class IV: any physical activity brings on discomfort and symptoms occur at rest.概述-心功能分级 根据症状对心功能分级: Class I: no limitation is experienced in any activities; no symptoms from ordinary activities. Class II: slight, mild limitation of activity; the patient is comfortable at rest or with mild exertion. Class III: marked limitation of any activity; the patient is comfortable only at rest. Class IV: any physical activity brings on discomfort and symptoms occur at rest. 5