ABSTRACT
Objective To study the clinical events and risk factors of in stent restenosis (ISR) during the ＞1 year follow-up period after vertebral artery stenting.Methods Forty-six patients with 48 stents implanted from the Shaoxing No.2 Hospital between January 2010 and October 2016were divided into ISR group (n=8) and ISR-free group (n=38) or clinical events group (n=8)and clinical events-free group (n=38).The influencing factors for their long-term clinical outcome were analyzed after vertebral artery stenting.Results The mean stenosis length was (7.7 ± 4.6mm,the stenosis severity was 80.7％±14.2％,and the residual stenosis was 3.0％±8.4％ before stenting.The mean angiographic follow-up time was 31.6±20.8 months,during which ISR occurred in 8 patients (17.4％).The mean clinical follow-up time was 53.8±27.0 months,during which clinical events occurred in 8 patients (17.4％).Survival analysis showed that ISR usually occurred in the first 20 months and no clinical events occurred in 23 patiemts (50.0％) after vertebral artery stenting.The stenosis was significantly longer in ISR group than in ISR-free group (6.00±2.00 mm vs 2.76±4.14 mm,P=0.003).The diameter of stents was significantly shorter in clinical events group than in clinical events-free group (3.53±0.93 mm vs 4.18±0.67 mm,P=0.024).Conclusion The long-term clinical follow-up outcome is associated with the length and diameter of stents in patients after vertebral artery stenting.