Background Atherosclerotic disease of the aortic arch is foundin 60 percent of patients 60 years of age or older who havehad brain infarction. The aim of this study was to determinewhether atherosclerotic plaques in the aortic arch are a riskfactor for recurrent brain infarction and for vascular eventsin general (i.e., brain infarction, myocardial infarction, peripheralembolism, and death from vascular causes).
Methods For a period of two to four years, we followed a cohortof 331 patients 60 years of age or older who were consecutivelyadmitted to the hospital with brain infarction (a total of 788person-years of follow-up). All patients underwent transesophagealechocardiography to determine whether atherosclerotic plaqueswere present in the aortic arch proximal to the ostium of theleft subclavian artery. The patients were divided into threegroups according to the thickness of the wall of the aorticarch (<1 mm, 1 to 3.9 mm, and >4 mm).
Results The incidence of recurrent brain infarction was 11.9per 100 person-years in patients with an aortic-wall thicknessof >4 mm, as compared with 3.5 per 100 person-years in patientswith a wall thickness of 1 to 3.9 mm and 2.8 per 100 person-yearsin patients with a wall thickness of <1 mm (P<0.001).The overall incidence of vascular events was 26.0, 9.1, and5.9 per 100 person-years of follow-up in the respective groups(P<0.001). After adjustment for the presence of carotid stenosis,atrial fibrillation, peripheral arterial disease, and otherrisk factors, aortic plaques >4 mm thick (including the thicknessof the aortic wall) were found to be independent predictorsof recurrent brain infarction (relative risk, 3.8; 95 percentconfidence interval, 1.8 to 7.8; P = 0.0012) and of all vascularevents (relative risk, 3.5; 95 percent confidence interval,2.1 to 5.9; P<0.001).
Conclusions Atherosclerotic plaques >4 mm thick in the aorticarch are significant predictors of recurrent brain infarctionand other vascular events.
Source Information
As the principal investigator, Dr. Amarenco assumes full responsibility for the overall content of the article.
Address reprint requests to Dr. Pierre Amarenco at the Service de Neurologie, Hôpital Saint-Antoine, 184, rue du Faubourg St.-Antoine, 75571 Paris CEDEX 12, France.
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