History | History of DVT/PE | No history of DVT/PE |
Examination | No signs of right heart failure | Signs of right heart failure |
Comorbidity | None | Significant concomitant lung or left heart disease |
Functional limitation | Functional class II or III | Functional class IV |
Imaging | Clear disease concordant on all images | Inconsistency on imaging modalities |
Type of disease | Bilateral lower lobe disease | No disease appreciable in lower lobes |
Haemodynamics | PVR <1000 dyn·s·cm−5, in proportion to site and number of obstructions on imaging; higher PA pulse pressure | PVR >1200 dyn·s·cm−5, out of proportion to site and number of obstructions on imaging; higher PA diastolic pressure |