This study is collecting post-marketing information on the safety and effectiveness of Ventavis under the routine clinical practice for patients with PAH

This local, prospective, non-interventional, company sponsored, multi-center, single-cohort study includes patients treated with Ventavis for PAH. A total of 270 patients (valid for safety analysis) is planned to be enrolled in 5 years. Target population is patients with PAH diagnosis. This study is performed as an all-patient investigation, therefore all patients who receive Ventavis treatment for PAH need to be registered. The treatment should be performed based on the product label in Japan. The standard observation period will last for 12 months from starting Ventavis treatment. In addition, the extension observation will be carried out as long as Ventavis treatment continues or at most for more 4 years. The standard observation points are 3 month and

1 to 5 years.

Inclusion Criteria:

• Patients diagnosed with PAH
• Patients for whom the decision to initiate treatment with Ventavis was made as per investigator's routine treatment practice.

Exclusion Criteria:

- N/A

Study population includes PAH patients treated with Ventavis. This study is performed as an all-case investigation. Therefore, all patients who have been treated with Ventavis for PAH need to be registered in principle, until the target number of patients reached.

Availability of this study's data will later be determined according to Bayer's commitment to the EFPIA/PhRMA "Principles for responsible clinical trial data sharing". This pertains to scope, timepoint and process of data access. As such, Bayer commits to sharing upon request from qualified researchers patient-level clinical trial data, study-level clinical trial data, and protocols from clinical trials in patients for medicines and indications approved in the US and EU as necessary for conducting legitimate research. This applies to data on new medicines and indications that have been approved by the EU and US regulatory agencies on or after January 01, 2014.

Interested researchers can use www.vivli.org to request access to anonymized patient-level data and supporting documents from clinical studies to conduct research. Information on the Bayer criteria for listing studies and other relevant information is provided in the member section of the portal.