Abstract
INTRODUCTION: Pulmonary arterial hypertension (PAH) is a progressive, often fatal disease characterized by an elevation in pulmonary arterial pressure and pulmonary vascular resistance (PVR). Oral treprostinil is indicated for the treatment of PAH and has been shown to delay disease progression and to improve exercise capacity. METHODS: The purpose of this report is to examine and summarize the data on the use of oral treprostinil in patients already on dual therapy with an endothelin receptor antagonist (ERA) and phosphodiesterase type-5 inhibitor (PDE-5i), using data from the FREEDOM-C study, FREEDOM-C2 study, and a retrospective chart review. RESULTS: In this analysis, background monotherapy versus dual therapy did not have an impact on clinical parameters (6-min walk distance). Additionally, the number of background therapies did not have an impact on the dose of oral treprostinil achieved at week 16 or measures typically used to assess clinical efficacy in patients with PAH (change in 6MWD at week 16 and NT-proBNP). CONCLUSION: Oral treprostinil is a safe and efficacious treatment option and has been shown to further improve clinical parameters and risk status in patients with PAH on background dual therapy. TRIAL REGISTRY: ClinicalTrials.gov identifier, NCT00325442 and NCT00887978.