Hypertension Study of Ventavis® Inhalation Therapy in the Treatment of Patients With Pulmonary Arterial Hypertension (VENIS)

Patients with pulmonary arterial hypertension, classified as New York Heart Association functional class III or IV where the treating physician has chosen Ventavis as a suitable treatment prior to inclusion into this non-interventional study. Patients should not have received prior treatment with Ventavis