Changes on Cognitive Function after Carotid Artery Stenting in Patients with Severe Carotid Artery Stenosis: A Prospective, 3 Months Follow-up Study

ABSTRACT

BACKGROUND: Carotid artery stenting (CAS) is emerging as an alternative to carotid endarterectomy for the treatment of carotid stenosis. The effects of CAS on cognitive function have not been fully addressed. The aim of this study was to assess the effect of carotid stenting on cognitive function from baseline to 3 months in patients with severe carotid artery stenosis through the use of a detailed neuropsychological test. METHODS: We recruited 28 patients with carotid artery stenosis (> or =70%) at baseline on a consecutive basis between February, 2009 and December, 2010. Twenty-two patients out of 28 cases, who had undergone CAS and follow-up neuropsychological evaluation after 3 months, were included in our analysis. Main cognitive outcome measures were the Seoul Neuropsychological Screening Battery-Dementia version (SNSB-D), which containing detailed cognitive tasks. We evaluated the baseline clinical characteristics and changes of cognitive outcome measures using SNSB-D in our cases from baseline to 3 months follow-up period, respectively. RESULTS: After a 3 month follow-up period, patients that underwent CAS showed significant improvement in cognitive function in total SNSB-D score compared to the baseline state of 18.1 points at 3 months (p<0.05). The other cognitive outcome measures showed significant improvements (p<0.05) in the task of confrontational naming, visual memory, and the scale of clinical dementia rating sum of box. CONCLUSION: We found that there might be a positive effect of carotid artery stenting on cognitive function from baseline to 3 months in patients with severe carotid artery stenosis.