Secondary end-points
| Control group | Iloprost group | p-value | |
| NYHA class | +0.1±0.3 | -0.1±0.2 | 0.64 |
| V’O2,peak | 0±2 | -1±2 | 0.14 |
| V’E/V’CO2 at AT | +1±8 | -1±5 | 0.65 |
| Peak SAP | -6±15 | -3±22 | 0.45 |
| QoL | -3±11 | +7±19 | 0.14 |
| Clinical worsening n | 4 | 3 | ND |
Data are presented as mean±sd, unless otherwise stated. NYHA: New York Heart Association; V’O2,peak: peak oxygen uptake; V’E/V’CO2 at AT: ventilatory efficacy; SAP: systolic arterial pressure; QoL: quality of life; ND: not done.