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Table 2 Etiologic groups of pulmonary hypertension [1].

From: Right-to-left shunt with hypoxemia in pulmonary hypertension

Etiologic group  
Pulmonary arterial hypertension (group 1) 7 (21%)
   Idiopathic 6 (18%)
   Portal hypertension 1 (3%)
Associated with lung disease and/or hypoxemia (group 3) 16 (47%)
   Chronic obstructive pulmonary disease 8 (23%)
   Interstitial lung disease 3 (9%)
   Combined pulmonary fibrosis and emphysema 3 (9%)
   Other 2 (6%)
Thromboembolic obstruction (group 4) 9 (26%)
Miscellaneous (group 5) 2 (6%)
  1. Data expressed are absolute values (percent of total).