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Etiologies and subcategories of WHO group 2 PH. HFpEF = heart failure with preserved ejection fraction; HFrEF = heart failure with reduced ejection fraction; LVEDP = left ventricular end-diastolic pressure; mPAP = mean pulmonary arterial pressure; PCWP = pulmonary capillary wedge pressure; PH = pulmonary hypertension; PVH = pulmonary venous hypertension; PVR = pulmonary vascular resistance; TPG = transpulmonary gradient; WHO = World Health Organization; WU = Wood units.
