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. 2021 Jun 4;85(1):1–10. doi: 10.4046/trd.2021.0022

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Fig. 2. — Treatment algorithm of pulmonary arterial hypertension. Modified from Thomas CA et al. Pulm Ther 2020;6:9–22, according to the Creative Commons license [23]. PAH: pulmonary arterial hypertension; CCB: calcium channel blocker; IPAH: idiopathic pulmonary arterial hypertension; HPAH: heritable pulmonary arterial hypertension; DPAH: drug- or toxin-induced pulmonary arterial hypertension; WHO-FC: World Health Organization functional class; PCA: prostacyclin analogue; BAS: balloon atrial septostomy.