Anatomic high surgical risk: Contralateral carotid occlusion Contralateral laryngeal palsy Post-radiation treatment Previous CEA recurrent stenosis High cervical ICA lesions CCA lesions below the clavicle Severe tandem lesions .
Using the criteria of successful trials, candidates are either symptomatic (TIA or stroke) patients with >50% stenosis of the carotid artery, or are asymptomatic with >80% stenosis of the internal carotid artery.