The detection of emboli was associated with an increased risk for ipsilateral TIA and stroke (HR 2.54, 95% CI 1.2–5.36) and in particular for ipsilateral stroke (HR 5.57, 95% CI 1.61–19.32) during 2 years of follow-up even after adjusting for antiplatelet therapy, degree of stenosis, and other risk factors. The absolute annual risk of ipsilateral stroke or TIA between baseline and 2 years was 7.13% in patients with embolic signals and 3.04% in those without, and for ipsilateral
stroke was Y-27632 supplier 3.62% in patients with embolic signals and 0.70% in those without. The authors performed a meta-analysis with all studies available including 1144 patients. The hazard ratio for the risk of ipsilateral stroke for those with embolic signals compared with those without was 6.63 (95% CI 2.85–15.44) with no heterogeneity between studies (p = 0.33). More recently, data from ACES demonstrated that plaque morphology assessed using a simple visual
rating scale predicts ipsilateral stroke in ACS [20]. 435 subjects with ACS ≥70% were included and followed-up for 2 years. A 4-point visual rating scale was applied to the plaques and they were classified as echolucent (37.7%) or echogenic. Plaque echolucency at baseline was associated with an increased risk of ipsilateral stroke alone (HR 6.43, 95% CI 1.36–30.44). A combination of plaque echolucency and ES positivity at baseline was associated with an increased
risk of ipsilateral stroke alone (HR 10.61, 95% CI 2.98–37.82). The combination of ES detection and plaque morphology Dabrafenib order allows a greater prediction than either measure alone and identifies a high-risk group with an annual stroke risk of 8%, and a low-risk group with a risk of <1% per year. These data ever show that the combination of 2 measures of plaque instability may identify a high-risk group of patients with ACS that may benefit from a CEA. MRI is a non-invasive method of plaque measurement that does not involve ionizing radiation. Examination of plaque under different contrast weighting (black blood: T1, T2, proton density-weightings, and magnetization prepared rapid gradient echocardiography or bright blood: time of flight) allows characterization of individual plaque components, including lipid-rich necrotic core, fibrous cap status, hemorrhage, and calcification [21]. A few small prospective studies have been done to investigate characteristics of carotid artery plaque on MRI that are associated with disease progression and future cardiovascular events. One study [22] examined patients with symptomatic and asymptomatic carotid disease to determine whether fibrous cap thinning or rupture as identified on MRI were associated with a history of recent transient ischemic attack or stroke.
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