期刊
STROKE
卷 37, 期 3, 页码 824-829出版社
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1161/01.STR.0000204277.86466.f0
关键词
carotid artery plaque; carotid stenosis; embolism; ultrasonography, Doppler, transcranial; stroke
Background and Purpose-To determine whether a stratified gray-scale median (GSM) analysis of the carotid plaque combined with color mapping correlated better with the presence of neurological symptoms and microembolic signals (MES) than a whole plaque measurement. Methods-A total of 131 patients presenting 167 carotid stenoses between 30% and 99% were analyzed by ultrasound. Emboli detection was performed by transcranial Doppler. For each plaque, the GSM values at depth 0 mm (surface) and at one third (30) and one half (50) of the plaque thickness were compared with the values obtained for the whole plaque. The plaque pixels were mapped into 3 colors: red, yellow and green, depending on their GSM value. Results-Mean GSM values were lower among symptomatic plaques, but a statistically significant difference between values of the whole plaque and those of the surface was obtained only for MES + stenoses (P < 0.01). In a proportional odds logistic regression model based on 4 subgroups with an increasing clinical risk (MES-/symptoms-; MES-/ symptoms +; MES+/ symptoms-; +; MES+/symptoms +), low mean GSM values and the predominant red color at the surface were independent factors associated with the presence of symptoms or MES (P < 0.0005). Furthermore, compared with a whole plaque measurement, analysis of the surface values predicted systematically with a greater sensitivity and specificity (receiver operating characteristic curves) each one of these 4 subgroups. Conclusions-Low mean GSM values and predominance of the red color at the surface correlated with most of the symptomatic or MES+ stenoses. This combined approach should be further investigated in a longitudinal study.
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