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Reproduced with permission from Haddad et al.[181] A decrease in pulmonary arterial pressure in patients with PH may indicate low cardiac output and severe right ventricular failure. CO = cardiac output; MPAP = mean pulmonary artery pressure; PAP = pulmonary artery pressure; PCWP = pulmonary artery capillary wedge pressure; PVR = pulmonary vascular resistance.[180]
