A Study of Sotatercept in Participants With PAH WHO FC III or FC IV at High Risk of Mortality (MK-7962-006/ZENITH)

This is a phase 3, randomized, double-blind, placebo-controlled study to evaluate sotatercept when added to maximum tolerated background PAH therapy on time to first event of all-cause death, lung transplantation, or PAH worsening related hospitalization of ≥24 hours, in participants with WHO FC III PAH or WHO FC IV PAH at high risk of mortality. Participants who were eligible for this study presented with symptomatic PAH that was classified as idiopathic, heritable, drug- or toxin-induced, associated with connective tissue disease, or post-shunt correction.