Jacksonville, Fla.
The purpose of this study is to demonstrate the effect of ralinepag the time to first adjudicated clinical worsening event in subjects with pulmonary arterial hypertension (PAH).Clinical worsening event is defined as 1 of the following: death, nonelective hospital admission of <24 hours due to worsening PAH or RHF, initiation of parenteral or inhaled therapy, disease progression, or unsatisfactory long term clinical response.