RT Journal Article SR Electronic T1 Riociguat: an upcoming therapy in chronic thromboembolic pulmonary hypertension? JF European Respiratory Review JO EUROPEAN RESPIRATORY REVIEW FD European Respiratory Society SP 68 OP 71 DO 10.1183/09059180.00007909 VO 19 IS 115 A1 N. H. Kim YR 2010 UL http://err.ersjournals.com/content/19/115/68.abstract AB Although pulmonary endarterectomy remains the treatment of choice for patients with chronic thromboembolic pulmonary hypertension (CTEPH), not all patients will benefit from or receive this highly specialised surgery. Patients whose CTEPH is deemed inoperable by an experienced centre and patients with persistent pulmonary hypertension after surgery are candidates for trial of pulmonary arterial hypertension (PAH) specific pharmacotherapies. However, the currently available PAH specific pharmacotherapies have not demonstrated a clear benefit in either of these patient groups. Accordingly, PAH therapies remain off-label for use in CTEPH. Riociguat (BAY 63-2521) is a stimulator of soluble guanylate cyclase, and may represent a novel agent in the treatment of select patients with CTEPH. Pre-clinical and human phase II studies with riociguat have reported promising results, and a multinational, randomised, controlled, double-blinded phase III study is currently underway to investigate the effect of riociguat in patients with inoperable CTEPH and those with persistent or recurrent pulmonary hypertension following pulmonary endarterectomy.