Cost-Utility and budget impact analysis of drug treatments in pulmonary arterial hypertension associated with congenital heart diseases in Thailand.

Objective: This study aims to compare the lifetime costs and health outcomes of both first-line and sequential combination treatments with standard treatment for pulmonary arterial hypertension (PAH) associated with congenital heart disease (CHD) (PAH-CHD) patients. Methods: A cost-utility analysis was performed using a Markov model based on a societal perspective. One-way and probabilistic sensitivity analyses were performed to investigate the effect of parameter uncertainty. Results: As first-line treatments, both beraprost (incremental cost-effectiveness ratio (ICER)=192,752 and 201,308 Thai baht (THB) per quality-adjusted life year (QALY) gained) and sildenafil (ICER=249,770 and 226,802 THB per QALY gained) seemed cost-effective for PAH-CHD patients aged30years in functional classes II and III, respectively, while no treatment was cost-effective for the sequential combination therapy. Conclusions: Sildenafil should be included in the National Drug List of Essential Medicines as the first-line treatment for PAH-CHD, and its price per dose should be negotiated to be reduced by 43-57%.