Selexipag for the treatment of chronic thromboembolic pulmonary hypertension
Takeshi Ogo, Hiroto Shimokawahara, Hideyuki Kinoshita, Seiichiro Sakao, Kohtaro Abe, Satoaki Matoba, Hirohiko Motoki, Noriaki Takama, Junya Ako, Yasuhiro Ikeda, Shuji Joho, Hisataka Maki, Takahiro Saeki, Teruyasu Sugano, Ichizo Tsujino, Koichiro Yoshioka, Naoki Shiota, Shinichi Tanaka, Chieko Yamamoto, Nobuhiro Tanabe, Koichiro Tatsumi, for the Study Group
Abstract
BACKGROUND: Treatment options for inoperable chronic thromboembolic pulmonary hypertension (CTEPH) remain limited. Selexipag, an oral selective IP prostacyclin receptor agonist approved for pulmonary arterial hypertension, is a potential treatment option for CTEPH. METHODS: In this multicentre, randomised, double-blind, placebo-controlled study, 78 Japanese patients with inoperable CTEPH or persistent/recurrent pulmonary hypertension after pulmonary endarterectomy and/or balloon pulmonary angioplasty were randomly assigned to receive placebo or selexipag. The primary end-point was the change in pulmonary vascular resistance (PVR) from baseline to week 20. Secondary end-points were changes in other haemodynamic parameters: 6-min walk distance (6MWD), Borg dyspnoea scale score, World Health Organization (WHO) functional class, EuroQol five-dimension five-level tool and N-terminal pro-brain natriuretic peptide. RESULTS: ; 95% CI -156.8 to -30.3; p=0.006). The changes in cardiac index (p<0.001) and Borg dyspnoea scale score (p=0.036) were also significantly improved over placebo. 6MWD and WHO functional class were not significantly improved. The common adverse events in the selexipag group corresponded to those generally observed following administration of a prostacyclin analogue. CONCLUSION: Selexipag significantly improved PVR and other haemodynamic variables in patients with CTEPH, although exercise capacity remained unchanged. Further large-scale investigation is necessary to prove the role of selexipag in CTEPH.