LAUSR

Background Single‐institution studies have demonstrated a negative effect of diabetes mellitus on outcomes after carotid endarterectomy (CEA). The aim of this study was to compare patients with explicitly controlled and uncontrolled diabetes at the population level. Methods Using the National Inpatient Sample 2006–2013, we selected patients undergoing CEA. Rates of stroke, myocardial infarction (MI), and hospital mortality, as well as duration of stay and cost were compared among patients with uncontrolled diabetes (UCDM), well‐controlled diabetes (WCDM), and those without diabetes (NDM). Results We reviewed data from 614,190 patients undergoing CEA. Patients with UCDM, compared with those with WCDM and NDM, had higher rates of stroke (3.27%, 0.93%, and 0.94%, respectively; P < .0001), MI (3.35%, 1.10%, and 0.87%, respectively; P < .0001), and higher hospital mortality (1.43%, 0.25%, and 0.27%, respectively; P < .0001). On multivariate analysis, patients with UCDM compared with WCDM were more likely to develop stroke (odds ratio[OR], 1.45; 95% confidence interval [CI], 1.23–1.71), and MI (OR, 2.26; 95% CI, 1.96–2.60) and were more likely to die (OR, 2.74; 95% CI, 2.19–3.42). Patients with WCDM compared with patients without diabetes had similar likelihoods of stroke (OR, 0.96; 95% CI, 0.90–1.02) and MI (OR, 1.04; 95% CI, 0.98–1.10) but were actually less likely to die (OR, 0.85; 95% CI, 0.76–0.95). Conclusion Patients with uncontrolled diabetes had poorer outcomes after CEA than those with controlled diabetes, whose outcomes were comparable to if not better than individuals without diabetes.