Abstract WP123: Timing and Risk Factors for Restenosis Following Carotid Endarterectomy and Angioplasty With Stenting

Background: We sought to determine the incidence of restenosis following carotid endarterectomy (CEA) and carotid angioplasty with stenting (CAS), analyze temporal trends to identify an optimal follow-up schedule, and identify covariates associated with restenosis. Methods: Patients undergoing CEA or CAS at our institution between 2009 and 2016 were assessed retrospectively. Temporal trends in peak systolic velocity (PSV) were examined qualitatively. Restenosis was defined as an increase in PSV to >250 cm/s, or as >70% stenosis on CTA or catheter angiography. Rates of restenosis were calculated using the Kaplan-Meier method. Cox proportional hazards regression was used to evaluate for an association between selected covariates and time to restenosis. Results: We analyzed 204 CEA and 113 CAS cases, of which 85% had symptomatic disease. Cumulative restenosis rates were 9% at one year and 14% at four years (Figure 1). There was no difference between CEA and CAS procedures (hazard ratio 1.285, p=0.58). Intere...