Rationale and study design of RESPITE: An open-label, phase 3b study of riociguat in patients with pulmonary arterial hypertension who demonstrate an insufficient response to treatment with phosphodiesterase-5 inhibitors
Patients not responding to PDE-5i therapy may have inadequate synthesis of cGMP. Such patients may response to soluble guanylate cyclase stimulators. The RESPITE trial will help determine if response to therapy varies in PAH patients.