Baseline characteristics of patients
| Baseline characteristics, n (%) | Basilar artery | Vertebral artery |
| n=6 | n=24 | |
| Age | 67 (59–73) | 68 (33–85) |
| Male sex | 5 (83.3) | 19 (79.1) |
| Indication | ||
| Stroke | 1 | 5 |
| Recurrent TIAs | 3 | 14 |
| Recurrent stroke | 2 | 5 |
| Procedure type | ||
| Angioplasty | 4 (75) | 11 (41.6) |
| Restenosis | 0 | 3 |
| Recurrent TIA | 0 | 1 |
| Recurrent stroke | 0 | 0 |
| Clinical complications | 1 | 1 |
| Stent | 2 (25) | 11 (50) |
| Restenosis | 1 | 3 |
| Recurrent TIA | 0 | 2 |
| Recurrent stroke | 1 | 1 |
| Clinical complications | 0 | 2 |
| Failed | 0 | 2 |
| Recurrent stroke | 0 | 1 |
| Posterior communicating artery existing | ||
| Yes | 4 (66.6) | 10 (41.7) |
| No | 2 (33.3) | 14 (58.3) |
| Time from the first event to procedure in days (mean) | 58 | 114 |
| Time from most recent event to procedure | 19 | 23 |
| Treatment within 14 days of symptoms | 3 (50) | 11 (46) |
TIA, transient ischaemic attack.