Figure 2. Improvement/worsening (in %) of outcome parameters in individual subjects after low dose iloprost inhalation (LD), high dose iloprost inhalation (HD) and placebo (PCB).

Parameters after placebo inhalation were considered 100%. Aa-gradient denotes alveolar-arterial oxygen gradient, HR heart rate, pCO₂ partial pressure of carbon dioxide after exercise, pO₂ partial pressure of oxygen, SpO₂ oxygen saturation, VCO₂ carbon dioxide production, VE minute ventilation, VO₂ oxygen consumption, 6MWD six-minute walking distance.