Overview Bosentan and Pulmonary Endothelial Function Status: Completed Trial end date: 2009-12-01 Target enrollment: Participant gender: Summary 6 months therapy of Bosentan, an endothelin antagonist, will lead to improvement in pulmonary microvascular endothelial function. Phase: N/A Details Lead Sponsor: Prof David S CelermajerTreatments: Bosentan