Classification of pulmonary hypertension, group 3

1 Pulmonary arterial hypertension
1′ Pulmonary veno-occlusive disease and/or pulmonary capillary haemangiomatosis
1′′ Persistent pulmonary hypertension of the newborn
2 Pulmonary hypertension owing to left heart disease
3 Pulmonary hypertension owing to lung diseases and/or hypoxia
3.1 Chronic obstructive pulmonary disease
3.2 Interstitial lung disease
3.3 Other pulmonary diseases with mixed restrictive and obstructive pattern
3.4 Sleep disordered breathing
3.5 Alveolar hypoventilation disorders
3.6 Chronic exposure to high altitude
3.7 Developmental abnormalities
4 Chronic thromboembolic pulmonary hypertension
5 Pulmonary hypertension with unclear multifactorial mechanisms

Data from [1].