Table II.

CMS qualifying HR factors

	CEA (n = 6370)	CAS (n = 3737)	P value
Age ≥80 years	19.3%	20.7%	.10
NYHA CHF class III/IV	3.5%	10.4%	<.001
LVEF <30%	0.9%	4.1%	<.001
Unstable angina	0.6%	3.6%	<.001
Recent MI (within 30 days)	0.5%	1.2%	<.001
Restenosis	2.5%	29.5%	<.001
Radical neck dissection	0.1%	4.0%	<.001
Contralateral occlusion	4.3%	13.4%	<.001
Prior radiation to neck	0.3%	8.4%	<.001
Contralateral laryngeal nerve injury	0.1%	0.9%	<.001
High anatomic lesion	1.2%	9.4%	<.001
At least one HR factor	37.0%	90.5%	<.001

CAS, Carotid artery stenting; CEA, carotid endarterectomy; CHF, congestive heart failure; CMS, Centers for Medicare and Medicaid Services; HR, high risk; LVEF, left ventricular ejection fraction; MI, myocardial infarction; NYHA, New York Heart Association.