| WHO
Class |
Description |
| Class I |
Patients with pulmonary hypertension but without resulting limitation of physical activity. Ordinary physical activity does not cause undue dyspnea or fatigue,
chest pain or near syncope. |
| Class
II |
Patients with pulmonary hypertension resulting in a slight limitation of physical
activity. They are comfortable at rest. Ordinary physical activity causes
undue dyspnea or fatigue, chest pain or near syncope. |
| Class
III |
Patients
with pulmonary hypertension resulting in marked limitation of physical activity.
They are comfortable at rest. Less than ordinary activity causes undue dyspnea
or fatigue, chest pain or near syncope. |
| Class
IV |
Patients
with pulmonary hypertension with inability to carry out any physical activity
without symptoms. These patients manifest signs of right heart failure.
Dyspnea and/or fatigue may even be present at rest. Discomfort is increased
by any physical activity. |