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SEOUL, South Korea, Aug. 12, 2025 ~ A recent study published in the Journal of the American Heart Association has revealed promising results for adolescents with single ventricle congenital heart disease (SV-CHD) who have undergone the Fontan procedure. The post-hoc analysis of the FUEL Trial, a landmark study on udenafil, a PDE5 inhibitor, showed that it significantly improves peak oxygen consumption (peak VO₂) in this patient population.
The original FUEL trial, which was a multinational, randomized, placebo-controlled Phase 3 trial, had already demonstrated significant improvements in secondary endpoints such as VO₂ at ventilatory anaerobic threshold (VAT) and myocardial performance index (MPI). However, it narrowly missed statistical significance for the primary endpoint of peak VO₂ in the overall population.
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Upon further analysis, researchers discovered a subgroup of participants with high exercise capacity known as "Super Fontans." This prompted them to stratify the data based on baseline peak VO₂ levels. The results showed that udenafil had a significant impact on improving peak VO₂ in this subgroup.
These findings provide hope for adolescents with SV-CHD who have undergone the Fontan procedure and struggle with reduced exercise capacity. Further research is needed to fully understand the potential benefits of udenafil in this patient population.
The original FUEL trial, which was a multinational, randomized, placebo-controlled Phase 3 trial, had already demonstrated significant improvements in secondary endpoints such as VO₂ at ventilatory anaerobic threshold (VAT) and myocardial performance index (MPI). However, it narrowly missed statistical significance for the primary endpoint of peak VO₂ in the overall population.
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Upon further analysis, researchers discovered a subgroup of participants with high exercise capacity known as "Super Fontans." This prompted them to stratify the data based on baseline peak VO₂ levels. The results showed that udenafil had a significant impact on improving peak VO₂ in this subgroup.
These findings provide hope for adolescents with SV-CHD who have undergone the Fontan procedure and struggle with reduced exercise capacity. Further research is needed to fully understand the potential benefits of udenafil in this patient population.
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