美国纽约心脏病学会（NYHA）1928年心功能分级：
Ⅰ级：患者患有心脏病但活动量不受限制，平时一般活动不引起疲乏、心悸、呼吸困难或
心绞痛。
Ⅱ级：心脏病患者的体力活动受到轻度的限制，休息时无自觉症状，但平时一般活动下可出现疲乏、心悸、呼吸困难或心绞痛。
Ⅲ级：心
脏病患者体力活动明显限制，小于平时一般活动即引起上述的症状。
Ⅳ级：心脏病患者不能从事任何体力活动。休息状态下也出现心衰的症状，体力活动后
加重。
1994,AHA对NYHA1928年心功能分级的补充
根据ECG，运动负荷试验，X-ray，心超，放射学显像等客观检查结果进行第二类
分级。
A级：无心血管病的客观证据
B级：有轻度心血管病的客观证据
C级：有中度心血管病的客观证据
D级：有重度心血管病
的客观证据
2002美国心脏病学会（ACC）及美国心脏学会（AHA）心衰分级新指南
A级：病人为心衰高危患者，但未发展到心脏结构改变也无症状；
B
级：指已发展到心脏结构改变，但尚未引起症状。
C级：指过去或现在有心衰症状并伴有心脏结构损害；
D级：终末期心衰，需要特殊的治疗措
施。
The Stages of Heart Failure NYHA Classification
In order to determine the best course of of therapy, physicians
often assess the stage of heart failure according to the New York Heart
Association (NYHA) functional classification system. This system relates
symptoms to everyday activities and the patient's quality of life.
|
Class
|
Patient Symptoms
|
|
Class I (Mild)
|
No limitation of physical activity. Ordinary physical activity
does not cause undue fatigue, palpitation, or dyspnea (shortness of
breath).
|
|
Class II (Mild)
|
Slight limitation of physical activity. Comfortable at rest, but
ordinary physical activity results in fatigue, palpitation, or dyspnea.
|
|
Class III (Moderate)
|
Marked limitation of physical activity. Comfortable at rest, but
less than ordinary activity causes fatigue, palpitation, or dyspnea.
|
|
Class IV (Severe)
|
Unable to carry out any physical activity without discomfort.
Symptoms of cardiac insufficiency at rest. If any physical activity is
undertaken, discomfort is increased. |
| 
