Figure 7.

Dependency of mean pulmonary artery pressure (pap) response on O₂-breathing as a function of residual volume (rv) and airway resistance (raw) % predicted. Legenda: open circles: baseline at; full circles: on oxygen. A: The response of mean PAP on O₂-breathing is lower in interstitial lung disease patients with low residual volume (RV% pred) and subnormal airway resistance (RAW %pred) compared to patients with increased airway resistance and over-inflation. B: Chest x-ray of a typical patient with interstitial lung disease variations in PAP and blood gases between baseline conditions and when breathing O₂ are reported.