Plaque surface and microembolic signals in moderate carotid stenosis

We performed Transcranial Doppler monitoring to detect microembolic signals (MES) in 47 patients with moderate (30%-69%) carotid stenosis proven by se lective angiography. We compared the occurrence of MES with the clinical ch aracteristics of stenosis (symptomatic or asymptomatic) and the angiographi c plaque features (nonulcerated, deep ulceration, superficial ulceration, u lceration with flap, or ulceration without flap). For these cases there was no indication for endarterectomy, nevertheless we thought it would be usef ul to identify risk subgroups that might benefit from surgical treatment. M ES were detected in 17.9% of the stenoses with a prevalence (p < .01) in sy mptomatic cases (25%) compared to asymptomatic cases (14.3%). There was a s ignificant correlation of MES with plaque ulceration (p < .01) and particul arly with ulceration without flap (p < .01). No difference between deep and superficial ulceration was observed. The availability of prospective data on this topic might be useful to select subgroups of patients with moderate carotid stenosis at risk for embolism.