. Author manuscript; available in PMC: 2020 Jul 6.

Published in final edited form as: Eur Respir J. 2019 Aug 22;54(2):1900586. doi: 10.1183/13993003.00586-2019

TABLE 1.

Haemodynamic definitions of pulmonary hypertension (PH)

	Prior definition	New definition
Group 1 (PAH)	mPAP ⩾25 mmHg and PVR >3 WU	mPAP >20 mmHg and PVR ⩾3 WU
	PAWP ⩽15 mmHg	PAWP ⩽15 mmHg
	No/mild lung disease or FVC ⩾70%	No/mild lung disease or FVC ⩾70%
Group 2 (post-capillary)^#	mPAP ⩾25 mmHg	mPAP >20 mmHg
	PAWP >15 mmHg	PAWP >15 mmHg
	PVR <3 WU	PVR <3 WU
Group 3 (lung disease and/or hypoxia)	mPAP ⩾25 mmHg and PVR >3 WU	mPAP >20 mmHg and PVR ⩾3 WU
	PAWP ⩽15 mmHg	PAWP ⩽15 mmHg
	Moderate/severe lung disease^¶ or FVC <70%	Moderate/severe lung disease^¶ or FVC <70%
Group 4 (combined pre- and post-capillary)	mPAP ⩾25 mmHg	mPAP >20 mmHg
	PAWP >15 mmHg	PAWP >15 mmHg
	PVR >3 WU	PVR ⩾3 WU

PAH: pulmonary arterial hypertension; mPAP: mean pulmonary arterial pressure; PVR: pulmonary vascular resistance; WU: Wood Units; PAWP: pulmonary arterial wedge pressure; ILD: interstitial lung disease; FVC: forced vital capacity.

^#:

PH due to left heart disease

^¶:

high-resolution computed tomography showing >20% total lung involvement due to ILD or if the total lung involvement due to ILD was 10-20% but the patient had concomitant moderate-to-severe emphysema.