Medications at the time of referral
| Medication | n (%) |
| Calcium channel blockers | 182 (32) |
| Digoxin | 102 (18) |
| Warfarin | 164 (28) |
| Prostacyclins | 14 (2) |
| Endothelin antagonists | 18 (3) |
| Phosphodiesterase inhibitors | 5 (1) |
| Aspirin | 77 (13) |
| Angiotensin-converting enzyme inhibitors | 70 (12) |
| Angiotensin receptor blockers | 23 (4) |
| β-blockers | 50 (9) |
| Diuretics | 272 (47) |
| Selective serotonin re-uptake inhibitors | 16 (6) |