作者报道，无症状的颈动脉狭窄患者的术中中风或者死亡的几率(2.2%)比有症状的颈动脉狭窄患者几率(4.4%)低。

Perioperative stroke or death rates were lower for patients with asymptomatic stenosis (2.2%) than for patients with symptomatic stenosis (4.4%), the authors report.

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另外，研究人员说，当无症状的颈动脉狭窄的程度上升时，任何复发的血管事件的相对危险上升。

In addition, say the investigators, the relative risk of any recurrent vascular events increased as the extent of asymptomatic CAS increased.

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总计221例(8%)受试者有50%或以上的无症状的颈动脉狭窄。

In all, 221 (8%) of the subjects had asymptomatic CAS of 50% or greater.

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