Parenteral prostacyclin analogues (PPA) are recommended for pulmonary arterial hypertension (PAH) patients at intermediate-high or high risk, yet supporting evidence remains limited. We retrospectively analyzed pretreated patients with idiopathic/heritable/drug-associated PAH (I/H/D-PAH), connective tissue disease-associated PAH (CTD-PAH), or congenital heart disease-associated PAH (CHD-PAH) from the COMPERA registry who received add-on PPA therapy. Among 495 patients, all pretreated with
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