Indications for Carotid Artery Stenting

Primary Indications by Stenosis Severity and Symptom Status

• The American Heart Association recommends carotid artery stenting (CAS) as an alternative to endarterectomy for symptomatic patients with ≥70% stenosis by noninvasive imaging (or ≥50% by catheter angiography) who are at average or low risk for endovascular complications, provided the anticipated periprocedural stroke or mortality rate is <6% 1, 2
• CAS is a Class I indication (equivalent to CEA) for average or low-risk patients when performed by operators with documented periprocedural stroke/death rates <6% 1, 2
• The procedure should ideally be performed within 2 weeks of the index neurological event 1, 3
• For stenosis 50-69%, patient-specific factors including age, comorbidities, and anatomy should guide the decision 2
• There is no indication for CAS or any revascularization procedure (Class III recommendation) for stenosis <50% 1, 2, 3, 4

Specific Clinical Scenarios Favoring CAS Over CEA

• Anatomic factors making surgery high-risk (Class IIa-IIb) include stenosis distal to the second cervical vertebra or proximal (intrathoracic) location 1, 2, 3
• Contralateral vocal cord paralysis is a factor that may favor CAS over CEA 4
• Radiation-induced stenosis is a condition that may favor CAS over CEA 6

Critical Contraindications and Cautions

• Age >70 years is a relative contraindication to CAS, with CEA demonstrating superior outcomes in older patients 5, 6
• Stroke risk is higher for CAS (3%) compared to CEA (1%) in patients over 70 years old 6
• Operator and center requirements are mandatory, with documented periprocedural morbidity/mortality rates of 4-6% for symptomatic patients 1, 2, 6

Mandatory Concurrent Medical Management

• All patients undergoing CAS must receive aggressive medical therapy, including antiplatelet therapy, high-intensity statin therapy, blood pressure control, smoking cessation, and diabetes management 4, 5, 6

Key Evidence Considerations

• The SAPPHIRE trial demonstrated non-inferiority of CAS to CEA in high-surgical-risk patients, with 30-day event rates of 5.8% for CAS versus 12.6% for CEA 7
• The CREST trial showed age-dependent outcomes, with CAS performing better in patients <70 years, while CEA was superior in those >70 years 2

Common Pitfalls to Avoid

• CAS should not be offered to symptomatic patients >70 years old unless there are compelling anatomic contraindications to surgery 5, 6
• CAS should not be performed if the center cannot document appropriate complication rates 1, 6