ABSTRACT
Pulmonary hypertension (PH) is a common complication of chronic respiratory diseases
and particularly of chronic obstructive pulmonary disease (COPD) and interstitial
lung diseases (ILD). Owing to its frequency COPD is by far the most common cause of
PH. It is generally a mild to moderate PH, pulmonary artery mean pressure (PAP) usually
ranging between 20 and 25 mm Hg, but PH may worsen during exercise, sleep, and particularly
during exacerbations of the disease. These acute increases in PAP may lead to the
development of right heart failure. A small proportion of COPD patients may present
“disproportionate” PH defined by a resting PAP >35 to 40 mm Hg. The prognosis is particularly
poor in these patients. PH is relatively frequent in advanced ILD and particularly
in idiopathic pulmonary fibrosis. As in COPD the diagnosis is suggested by Doppler
echocardiography, but the confirmation still requires right heart catheterization.
As in COPD, functional (alveolar hypoxia) and morphological factors (vascular remodeling,
destruction of the pulmonary parenchyma) explain the elevation of pulmonary vascular
resistance that leads to PH. Also as in COPD PH is most often mild to moderate. In
ILD the presence of PH predicts a poor prognosis. The treatment of PH relies on long-term
oxygen therapy. “New” vasodilator drugs have rarely been used in COPD and ILD patients
exhibiting severe PH. In advanced ILD the presence of PH is a supplemental argument
for considering lung transplantation.
KEYWORDS
Pulmonary hypertension - chronic obstructive pulmonary disease - idiopathic pulmonary
fibrosis - interstitial lung diseases - pulmonary artery pressure
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Emmanuel WeitzenblumM.D.
Department of Pulmonology, Nouvel Hôpital Civil
67091 Strasbourg, France
Email: Emmanuel.weitzenblum@chru-strasbourg.fr