Table 2. Hemodynamic definitions of pulmonary hypertension (PH).

Definitions	Characteristics	Clinical groups#
Pre-capillary PH	mPAP > 25 mmHg PAWP ⩽ 15 mmHg PVR ⩾ 3 WU	1, 3, 4 and 5
Isolated post-capillary PH (IpcPH)	mPAP > 25 mmHg PAWP > 15 mmHg PVR < 3 WU	2 and 5
Combined pre- and post-capillary PH (CpcPH)	mPAP > 25 mmHg PAWP > 15 mmHg PVR ⩾ 3 WU	2 and 5