| Completed | 2 | 75 | Europe | Bosentan, Bosentan: Tracleer, Placebo | Rigshospitalet, Denmark, Aarhus University Hospital, Bispebjerg Hospital, Actelion | Hypoplastic Left Heart Syndrome, Tricuspid Atresia, Other Specified Congenital Anomalies of Heart | 03/13 | 03/13 | | |