Predictors of Wingspan in-stent restenosis for the treatment of symptomatic intracranial arterial stenosis

To analyze the predictors of Wingspan in-stent restenosis (ISR) for the treatment of symptomatic intracranial arterial stenosis. Between January 2007 and November 2009, 42 patients with symptomatic intracranial arterial stenosis registered in Nanjing stroke registry program (NSRP) were treated with Wingspan stent system. Clinical and follow-up results were retrospectively analyzed. They were divided into the non-restenosis and restenosis groups according to their follow-up imaging data. ISR was defined as > 50% stenosis within 5 mm or adjacent to stent or an absolute luminal loss > 20%. The analysis of stepwise multivariate Cox regression was performed to evaluate the independent predictive factors. ISR was found in 15 patients (15/42, 35.7%) with 16 lesions (16/43, 37.2%) at a median follow-up period of 7 months (range: 4 - 23). Diabetes (HR = 0.281; 95%CI = 0.088 - 0.898; P = 0.032) and stent diameter (HR = 0.213; 95%CI = 0.049 - 0.918; P = 0.038) were two independent predictors for ISR. Diabetes and stent diameter may be two independent predictors for ISR after a treatment of Wingspan system.