The World Health Organization (WHO) reported a functional classification for pulmonary hypertension. The classification is similar to the NYHA functional classification.
Patient selection: pulmonary hypertension
Parameters:
(1) limitation of physical activity
(2) symptoms (dyspnea, fatigue, chest pain, near syncope)
Limitation of Physical Activity
Symptoms
Class
none with ordinary physical activity
none with ordinary physical activity but may be symptomatic with exertion
I
slight
with ordinary physical activity but none at rest
II
marked; unable to perform simple chores
with less than ordinary activity but none at rest
III
unable to perform
with any physical activity and some at rest; may have signs of right heart failure
IV
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