Baseline Characteristics at Diagnosis.

Data show baseline characteristics at time of diagnosis. Drug-group, patients treated with medical therapy alone; Interventions-group, patients treated with pulmonary endarterectomy (PEA) and/or percutaneous transluminal pulmonary angioplasty (PTPA); NYHA, New York Heart Association; RAP, right atrial pressure; PAP, pulmonary arterial pressure; TPR, total pulmonary resistance; BNP, B-type natriuretic peptide; 6MWD, six-minute-walk distance; PDE-5 inhibitor, phosphodiesterase-5 inhibitor; ERA, endothelin-receptor antagonist; NS, not significant (p>0.05).