Patient-Reported Outcomes and Adherence After Transition From Inhaled Iloprost to Oral Selexipag in Pulmonary Arterial Hypertension

Pulmonary arterial hypertension (PAH) is a progressive and life-threatening disease that requires long-term treatment with targeted therapies. Medications acting on the prostacyclin pathway are an important component of PAH management. Inhaled iloprost has demonstrated clinical and hemodynamic benefits but requires multiple daily inhalations, which may increase treatment burden and negatively affect adherence and daily functioning. Oral selexipag, a selective IP receptor agonist administered twice daily, offers a less complex dosing regimen and may improve treatment persistence and patient experience. In Brazil, the incorporation of oral selexipag into national treatment guidelines has led to an increasing number of patients transitioning from inhaled iloprost to oral therapy as part of routine clinical care. However, data on patient-reported outcomes, satisfaction, and real-world adherence following this transition are limited, particularly in Latin American populations. The PROMISE study is a prospective, observational, single-center study designed to assess the patient experience associated with the transition from inhaled iloprost to oral selexipag in adults with PAH. The study focuses on changes in health-related quality of life, treatment satisfaction, global perception of improvement, and objective and self-reported measures of adherence over time. A comparison group of patients who continue treatment with inhaled iloprost will be followed in parallel to provide contextual interpretation of observed changes. All treatment decisions, including initiation, continuation, titration, or discontinuation of medications, are made exclusively by the treating physician according to standard clinical practice. Participation in the study does not influence therapeutic choices, and no additional interventions beyond routine care are performed. Data collection consists of validated patient-reported outcome measures, structured questionnaires, and review of clinical information obtained during usual follow-up visits. By capturing patient-centered outcomes in a real-world setting, the PROMISE study aims to improve understanding of the impact of treatment transitions on daily life and adherence in PAH, supporting more informed, patient-focused management strategies.