Early Treatment of Borderline Pulmonary Arterial Hypertension Associated With Systemic Sclerosis (SSc-APAH)

"Titration:~As common practice of the clinic, the patient will adapt the dose from 5 mg to 10 mg after 1 to 4 weeks according to tolerability and after consultation (by phone or personally) with one of the investigators.~Additionally, at each study visit the investigator needs to decide, based on the patient's well-being, patients´ assessment, safety parameters, and tolerance of ambrisentan, if the study medication should be modified. The respective decision (increase, maintain or decrease dose) must be documented.~Maximum dose allowed: not to exceed 10 mg/day.~Administration:~Ambrisentan and placebo will be administered orally with or without food intake."

Placebo tablet (one to two tablets corresponding to one to two verum tablets)