The 5.6% overall risk of stroke and/or death from endarterectomy for symptomatic carotid stenosis is consistent with present guidelines.
The reported risks of endarterectomy for symptomatic carotid stenosis show significantly greater variability than would be expected by chance. However, much of this variability can be accounted for by differences in methodology and authorship. The 5.6% overall risk of stroke and/or death is consistent with present guidelines.
Rothwell et al. (1996) studied this question.