HA Residents With PVD, Pulmonary Artery Pressure (PAP) Assessed at HA (2840m) With and Without Supplemental Oxygen Therapy (SOT)

Patients with PVD diagnosed with precapillary PH with right heart catheterization and classified to groups 1 and 4 (PAH or CTEPH) who permanently live at HA \>2500 (PVDHA) will have echocardiografy to assess PAP, cardiac output and other hemodynamics and arterial blood gas to assess SaO2, PaO2 and PaCO2 near their living altitude in Quito at 2840m whilst breathing ambient air or SOT at 10l/min flow via a face mask with reservoir.