This is an observational study to monitor the continued effectiveness of Ventavis (inhaled iloprost) in the long-term. The study observes the effects and the safety of Ventavis inhalation therapy over at least 2 years and up to 4 years. A total of 54 patients from around 30 study sites in Europe will be included in the study. This observational study will collect information in patients receiving a medication that is already available on prescription in the participating countries. Ventavis is used to treat moderate cases of primary pulmonary hypertension.

Inclusion Criteria:

• The treating physician has chosen Ventavis as a suitable long-term treatment for the patient
• Patient with primary pulmonary hypertension (i.e. Idiopathic Pulmonary Arterial Hypertension or Familial Pulmonary Arterial Hypertension) and classified as NYHA functional class III (NYHA = New York Heart Association)
• No prior treatment with Ventavis or other active treatments for primary pulmonary hypertension within 6 weeks of date of study inclusion (unless otherwise advised by Bayer Schering Pharma)

Exclusion Criteria:

• Any condition that prevents participation in the study, including pregnancy and other contraindications for Ventavis treatment (as listed in the current Ventavis Summary of Product Characteristics and patient package insert)

Patients with the disease in scope and the prescription of Ventavis mainly from expert clinics in the participating countries