“…[28] In evaluable patients at follow-up, 6MWD was significantly longer than at baseline (401 vs 370 m; p < 0.009), WHO functional class was maintained in all patients (3 patients improved from baseline and 12 remained stable) and systemic arterial oxygen saturation remained stable relative to baseline (90% vs 91%). In a retrospective chart review, 15 patients with Eisenmenger syndrome received treatment with ambrisentan for at least 3 months (average 188 days); 8 patients had previously received either sitaxentan or bosentan, and 14 were receiving a PDE-5 inhibitor or iloprost at baseline.…”