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Table 1: 

Criteria for high-risk patients
Clinically significant cardiac disease
    Congestive heart failure (New York Heart Association functional class III/IV)
    Abnormal stress test
    Need for open-heart surgery
    Unstable angina (Canadian Cardiovascular Society class III/IV)
    Left ventricular ejection fraction ≤30%
    Planned coronary artery bypass graft or valve replacement
Severe pulmonary disease
    Chronic obstructive pulmonary disease manifested with FEV ≤30%
Contralateral carotid occlusion or stenosis
Previous radical neck surgery or radiation therapy to the neck
Recurrent stenosis after endarterectomy
Age ≥75 years
Surgically inaccessible lesion at or above C2, or below clavicle
Laryngeal palsy or laryngectomy
Symptom onset within 2 weeks
Neurologic symptoms (National Institutes of Health Stroke Scale grade ≥4) within 48 hours from onset
Arteriosclerosis obliterans
Cancer
History of major surgery within the past year
Renal problems (creatinine level >1.5 mg/dL)