Dynamic carotid plaque imaging using ultrasonography

ObjectiveDynamic image analysis of carotid plaques has demonstrated that during systole and early diastole, all plaque components will move in the same direction (concordant motion) some plaques. However, others, different parts directions (discordant motion). The aim our study was (1) to determine prevalence discordant motion symptomatic asymptomatic plaques, (2) develop a measurement severity motion, (3) correlation between symptom prevalence.MethodsA total 200 patients with 204 resulting 50% 99% stenosis (112 92 plaques) had video recordings available 10 cardiac cycles. Video tracking performed using Farneback's method, which relies on frame comparisons. In study, these were at 0.1-second intervals. maximum angular spread (MAS) vectors 10-pixel intervals area measured degrees. Plaques classified as concordant (MAS, <70°), moderately 70°-120°), >120°).ResultsMotion 89.1% but only 17.9% (P < .001). symptoms increased increasing MAS. For MAS >120°, hazard ratio for presence 47.7 (95% confidence interval, 18.1-125.6) compared rest after adjustment degree mean pixel motion. under receiver operating characteristic curve prediction 0.876 0.823-0.929). use median (120°) cutoff point 86% correctly (sensitivity, 81.4%; specificity, 91.2%; positive predictive value, 90.2%; negative 83.0%).ConclusionsThe value identify risk developing and, particular, stroke should be tested prospective studies.