Pulmonary hypertension (PH) is a heterogeneous group of disorders that can be classified according to clinical, hemodynamic and pathological findings and the prognosis of each group differs substantially [1]. Pulmonary arterial hypertension (PAH) and chronic thromboembolic pulmonary hypertension (CTEPH) are distinct types of pre-capillary PH, defined by mean pulmonary arterial pressure (mPAP) >20 mmHg, pulmonary arterial wedge pressure (PAWP) ≤15 mmHg and PVR ≥ 3 Wood units [2].
