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Factors associated with delay in carotid endarterectomy for patients with symptomatic severe internal carotid artery stenosis: a case-control study.

CMAJ Open 2018 May 16
BACKGROUND: The Canadian Best Practice Recommendations for Stroke Care (2008 update) recommend that patients with neurologic symptoms secondary to severe internal carotid artery stenosis undergo carotid endarterectomy within 14 days of symptom onset to prevent stroke. The purpose of this study was to identify patient and system factors associated with meeting, or failing to meet, the guideline.

METHODS: In this case-control study, potential study participants were identified through an electronic search of the Discharge Abstract Database. We reviewed the charts of patients who presented to our centre with neurologic symptoms ipsilateral to internal carotid artery stenosis of 70%-99% and underwent carotid endarterectomy in our centre between Jan. 1, 2009, and Dec. 31, 2014. We performed logistic regression analysis to identify factors associated with meeting, or failing to meet, the guideline.

RESULTS: Of the 412 patients who underwent carotid endarterectomy during the study period, 219 met the inclusion criteria. Sixty-seven patients (30.6%) met the 14-day guideline. Thirty (14.2%) of the 212 patients who could be classified as case or control subjects did not access the health care system within 14 days. Once in the health care system, failure to meet the guideline was associated with a presentation of amaurosis fugax (odds ratio [OR] 0.22, 95% confidence interval [CI] 0.05-0.96 compared to completed minor stroke) and presentation to a nonemergency outpatient setting (OR 9.08, 95% CI 2.51-32.80 compared to emergency department).

INTERPRETATION: Improvements in meeting the goal of carotid endarterectomy within 14 days of symptom onset for severe internal carotid artery stenosis should be directed at patient and system factors. A system for rapid diagnosis and referral of symptomatic patients to an appropriate surgeon should be established.

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