Table 1. Hemodynamic definitions of pulmonary hypertension.

Definitions	Characteristics	Clinical groups
Pre-capillary PH	mPAP >20 mmHg, PCWP <15 mmHg, PVR >3 WU	1, 3, 4, and 5
Isolated post-capillary PH	mPAP >20 mmHg, PCWP >15 mmHg, PVR<3 WU	2 and 5
Combined pre- and post-capillary PH	mPAP >20 mmHg, PCWP >15 mmHg, PVR >3 WU	2 and 5

PH, pulmonary arterial hypertension; mPAP, mean pulmonary artery pressure; PCWP, pulmonary capillary wedge pressure; PVR, pulmonary vascular resistance.