Ambrisentan and tadalafil up-front combination therapy in scleroderma-associated pulmonary arterial hypertension

Paul M. Hassoun, Roham T. Zamanian, Rachel Damico, Noah Lechtzin, Rubina Khair, Todd M. Kolb, Ryan J. Tedford, Olivia L. Hulme, Traci Housten, Chiara Pisanello, Takahiro Sato, Erica H. Pullins, Celia P. Corona-Villalobos, Stefan L. Zimmerman, Mohamed A. Gashouta, Omar A. Minai, Fernando Torres, Reda E. Girgis, Kelly Chin, Stephen C. Mathai

Research output: Contribution to journalArticlepeer-review

120 Scopus citations


Background: Scleroderma-associated pulmonary arterial hypertension (SSc-PAH) is a rare disease characterized by a very dismal response to therapy and poor survival. We assessed the effects of up-front combination PAH therapy in patients with SSc-PAH. Methods: In this prospective, multicenter, open-label trial, 24 treatment-naive patients with SSc-PAH received ambrisentan 10 mg and tadalafil 40 mg daily for 36 weeks. Functional, hemodynamic, and imaging (cardiac magnetic resonance imaging and echocardiography) assessments at baseline and 36 weeks included changes in right ventricular (RV) mass and pulmonary vascular resistance as co-primary endpoints and stroke volume/pulmonary pulse pressure ratio, tricuspid annular plane systolic excursion, 6-minute walk distance, and N-terminal pro-brain natriuretic peptide as secondary endpoints. Results: At 36 weeks, we found that treatment had resulted in significant reductions in median (interquartile range [IQR])RVmass (28.0 g [IQR, 20.6-32.9] vs. 32.5 g [IQR, 23.2-41.4]; P<0.05) and median pulmonary vascular resistance (3.1 Wood units [IQR, 2.0-5.7] vs. 6.9 Wood units [IQR, 4.0-12.9]; P<0.0001) and in improvements in median stroke volume/pulmonary pulse pressure ratio (2.6 ml/mm Hg [IQR, 1.8-3.5] vs. 1.4 ml/mm Hg [IQR 8.9-2.4]; P<0.0001) and mean (±SD) tricuspid annular plane systolic excursion (2.2±0.12 cm vs. 1.65±0.11 cm; P<0.0001), 6-minute walk distance (395±99 m vs. 343±131 m; P = 0.001), and serum N-terminal pro-brain natriuretic peptide (647±1,127 pg/ml vs. 1,578±2,647 pg/ml; P<0.05). Conclusions: Up-front combination therapy with ambrisentan and tadalafil significantly improved hemodynamics, RV structure and function, and functional status in treatment-naive patients with SSc- PAH andmay represent a very effective therapy for this patient population. In addition, we identified novel hemodynamic and imaging biomarkers that could have potential value in future clinical trials.

Original languageEnglish (US)
Pages (from-to)1102-1110
Number of pages9
JournalAmerican journal of respiratory and critical care medicine
Issue number9
StatePublished - Nov 1 2015


  • MRI
  • Pulmonary arterial hypertension
  • Therapy

ASJC Scopus subject areas

  • Pulmonary and Respiratory Medicine
  • Critical Care and Intensive Care Medicine


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