Cumulative survival curve of patients with pulmonary arterial hypertension.

(A) The 1-year, 2-year, and 3-year estimated survival rates shown are 84.9%, 62.2%, and 54.3%, respectively. (B). Primary outcome: cumulative survival curve of patients with pulmonary arterial hypertension according to etiology. IPAH, idiopathic pulmonary arterial hypertension; APAH, acquired pulmonary arterial hypertension.