Prospective registry including incident patients and prevalent patients which pretends to identify clinical characteristics, treatment trends in-hospital and ten years follow-up outcome through major adverse cardiovascular events (MACE) in a China population with well characterized PAH.

baseline include: An echocardiogram to assess the size, shape, pumping action and the extent of any damage to the heart.

Lung function tests which include blowing measurements to assess gas volumes within the lungs as well as assessment of how the lungs exchange gases.

Right heart catheterisation (RHC) to diagnose PAH Optional Cardiac Magnetic Resonance tests. 6 minute walk distance (6MWD). To measure exercise capacity Electrocardiogram (ECG), a test that measures the electrical activity of the heart Blood tests

MACE include:

death heart/lung transplantation atrial septostomy hospitalization due to worsening of PAH start of new specific PAH treatment persistent decrease of >15% from baseline in 6MWD (or >30% compared with last study-related measurement) persistent worsening of World Health Organization (WHO) Functional Class (FC）

Inclusion Criteria:

diagnosis of PAH (by RHC)

Exclusion Criteria:

Refusal to participate.

patients with diagnosis of PAH from groups I