During a median follow-up of 3 years ( IQR 13-41 ) , seven ( 12 % , 95 % CI 6-24 ) patients in the stenting group and four ( 7 % , 2-17 ) in the medical treatment group had a stroke in the territory of the symptomatic vertebral artery ; 11 ( 19 % ) patients in the stenting group and ten ( 17 % ) in the medical treatment group had vascular death , myocardial infarction , or any stroke .