Haemodynamic definitions of pulmonary hypertension (PH)
| Definitions | Characteristics | Clinical groups# |
| Pre-capillary PH | mPAP >20 mmHg | 1, 3, 4 and 5 |
| PAWP ≤15 mmHg | ||
| PVR ≥3 WU | ||
| Isolated post-capillary PH (IpcPH) | mPAP >20 mmHg | 2 and 5 |
| PAWP >15 mmHg | ||
| PVR <3 WU | ||
| Combined pre- and post-capillary PH (CpcPH) | mPAP >20 mmHg | 2 and 5 |
| PAWP >15 mmHg | ||
| PVR ≥3 WU |
mPAP: mean pulmonary arterial pressure; PAWP: pulmonary arterial wedge pressure; PVR: pulmonary vascular resistance; WU: Wood Units. #: group 1: PAH; group 2: PH due to left heart disease; group 3: PH due to lung diseases and/or hypoxia; group 4: PH due to pulmonary artery obstructions; group 5: PH with unclear and/or multifactorial mechanisms.