A Study Investigating Routine Practice of Chronic Thromboembolic Pulmonary Hypertension Management in EMEA Countries

Inclusion Criteria: * Female and male patients ≥ 18 years of age, diagnosed with CTEPH regardless of the current treatment * Availability of a signed informed consent * WHO Pulmonary Hypertension clinical classification Group IV (CTEPH): 1. Right heart catheterization (RHC) results that are in line with both of the following haemodynamic levels: * Mean pulmonary arterial pressure (PAP) ≥ 25 mmHg at rest * Pulmonary arterial wedge pressure (PAWP) ≤ 15 mmHg 2. Confirmation of CTEPH diagnosis by one of the following as recommended by standard guidelines: * At least 1 (segmental) perfusion defect(s) in ventilation/perfusion (V/Q) scan or * Pulmonary artery obstruction seen by MDCT (multidetector computed tomography) angiography or * Pulmonary artery obstruction seen by conventional pulmonary cineangiography (In case of suspicion/diagnosis of 'sub-acute' Pulmonary Embolism: Patients who are treated with anti-coagulation for at least 3 months before diagnosis of CTEPH) Exclusion Criteria: * Patients with an underlying medical disorder with an anticipated life expectancy less than 6 months * Any medical condition which, in the opinion of the investigator, could jeopardize the safety of the patient or his/her compliance in the study, or otherwise make the patient inappropriate for study participation