Table 3

WHO functional classification of pulmonary hypertension10

NYHA/WHO functional class
Classifications Symptoms
Class INo symptoms and no limitation in ordinary physical activity.
Class IIMild symptoms (mild shortness of breath and/or angina) and slight limitation during ordinary activity.
Class IIIMarked limitation in activity due to symptoms, even during less-than-ordinary activity. Comfortable only at rest.
Class IVSevere limitations. Experiences symptoms even while at rest.