1. All suspected cases of pulmonary arterial hypertension (PAH)
· Idiopathic or familial.
· Connective tissue disease associated (especially scleroderma, SLE, MCTD).
· Congenital heart disease, pre and post-correction.
· Portopulmonary hypertension.
· Other associated conditions:– HIV, anorexigen use, sickle cell disease.
2. All suspected cases of chronic thromboembolic pulmonary hypertension.