Table 2

Performance of self-reported best practice procedure components for CMS facilities (n=22)

Best practice	Non-CREST participants (%) (n=19)	CREST participants (%) (n=3)
mRS pre-stent	32	67
NIHSS pre-stent	74	100
DSA including head and neck pre-stent	74	100
Electronic calliper determination of per cent stenosis	21	100
Measure per cent stenosis using NASCET criteria	63	100
Embolic protection device use	90	100
DSA including head and neck post-stent	68	100
Treated with antiplatelet dual regimen	79	100
ACT >250 s	47	100
NIHSS 24 hours post-stent	74	100
~30-day post-stent neurological assessment	79	100
~30-day post-stent follow-up mRS	58	100
~30-day post-stent follow-up NIHSS	58	100
~30-day post-stent outcomes stroke and death	68	100
~30-day non-invasive study	58	67
Benchmark for stroke and death	42	100
Overall	62	100

ACT, activated clotting time; CMS, Centers for Medicare and Medicaid Services; CREST, Carotid Revascularisation and Medical Management for Asymptomatic Carotid Stenosis Study Trial; DSA, digital subtracted angiography; mRS, Modified Rankin Scale; NASCET, North American Symptomatic Carotid Endarterectomy Trial; NIHSS, National Institute of Health Stroke Scale.