Results of the two randomised trials on intracranial stenting
| Symptomatic disease | Number of patients | 30-day events | Long-term events beyond 30 days | Withdrew | Lost to follow-up | |
| SAMMPRIS | 70%–99% stenosis | 32.4 months | ||||
| Stenting group | 224 | 33 (14.7%) | 52 (23%) | 3 (1.3%) | 7 (3.1%) | |
| Medical group | 227 | 13 (5.8%) | 34 (15%) | 13 (5.7%) | 11 (4.8%) | |
| VISSIT | 70%–99% stenosis | 12 months | ||||
| Stenting group | 59 | 14 (23.7%) | 21 (36.2%) | 3 (5.1%) | 1 (1.7%) | |
| Medical group | 53 | 5 (9.4%) | 8 (15.1%) | 3 (5.7%) | 6 (11.3%) |