| Improved and survived >12 months (%) | Stabilised and survived >12 months (%) | Died <12 months (%) | Intolerant (%) | |
| Outcome after starting iv epoprostenol before oral agents available (pre-2002) n = 20 | 9 (45) | 1 (5) | 10 (50) | 0 |
| Outcome after starting iv epoprostenol after oral agents available (post-2002) n = 30 | 17 (57) | 3 (10) | 9 (30) | 1 (3) |