Carotid endartectomy trials.

For endarterectomy for symptomatic carotid artery stenosis, there is strong evidence that has been universally accepted and put forward by the North American Symptomatic Carotid Endarterectomy Trial (NASCET), with corroboration from the European Carotid Surgery Trials Collaborative Group, that patients with severe stenosis have an extremely high risk for stroke without carotid endarterectomy and a low risk with it. We are awaiting for NASCET information regarding the lower limit of percent stenosis for which patients with symptoms should be considered for surgery.