Carotid artery disease progression and related neurologic events after carotid endarterectomy

Abstract

During the last decade, there has been a dramatic improvement in best medical treatment for patients with vascular disease. Yet, there is a paucity of contemporary long-term data for restenosis and contralateral internal carotid artery (ICA) progression. This study assessed ipsilateral and contralateral disease progression and cerebrovascular events after carotid endarterectomy (CEA). A consecutive cohort of CEAs between January 1, 2000, and December 31, 2010, was retrospectively analyzed. End points were restenosis ≥50% and ≥70%, contralateral carotid disease progression (50%-69%, 70%-99%, or occlusion) and stroke. Survival analysis and Cox regression models were used to assess the effect of baseline predictors. During the 11-year study period, 1639 patients underwent 1782 CEAs (50.0% patch closure, 23.9% primary closure, 26.1% eversion, and 2.5% combined with coronary artery bypass grafting). The combined stroke/death rate was 2.6% overall and 1.8% in the asymptomatic cohort. The rate of restenosis ≥50% at 2, 5, and 10years was 8.5%, 15.6%, 27.2%, and the rate for restenosis ≥70% was 3.4%, 6.5%, 10.2%, respectively. Restenosis ≥50% was predicted by hypertension (hazard ratio [HR], 2.09; P= .027), female gender (HR, 1.43; P= .042), and younger age (≤65years; HR, 1.56; P= .016), but not by statins, surgical technique, symptoms, or other baseline risk factors. Restenoses remained asymptomatic in 125 of 148 (84.5%). Progression of contralateral ICA disease at 2, 5, and 10years was estimated at 5.4%, 15.5%, and 46.8%, respectively. Contralateral progression was only predicted by smoking (HR, 1.74; P=.008). The stroke rate in patients with disease progression of the contralateral ICA was not different compared with those without progression (7.0% vs 3.3%; P= .063). Any-stroke rates at 2, 5, and 10years were 4.6%, 7.3%, and 15.7%, respectively. Predictors were symptomatic lesion (HR, 1.48; P= .039), renal insufficiency, defined as a glomerular filtration rate (GFR) of 30 to 59 vs<30mL/min/1.73m2 (HR, 0.34; P= .009) or GFR ≥60 vs GFR<30mL/min/1.73m2 (HR, 0.55; P= .109), and statin use (HR, 0.59; P= .006). Restenosis or contralateral disease progression after CEA, to a level that might warrant consideration for treatment, is very low. The potentially associated stroke rates are also very low and not clearly related to disease progression. With the exception of the postoperative duplex, surveillance within short intervals of<1 or 2years cannot be justified.