Table 1 Final appropriateness ratings for carotid endarterectomy for symptomatic stenosis by degree of stenosis.

Severe (70 – 99%)

Hemispheric TIA

Any indication, surgery performed at any time up to 2 years

Appropriate

Retinal TIA

Any indication, surgery performed at any time up to 2 years

Appropriate

Mild Stroke

Any indication, surgery performed at any time up to 2 years

Appropriate

Moderate Stroke

Any indication, surgery performed at any time up to 2 years

Appropriate

Stroke in Evolution

Uncertain

Moderate (50 – 69%)

Hemispheric TIA

Single, multiple, crescendo events within the last 180 days with contralateral stenosis +/- ulcerated stenosis

Appropriate

Single event with contralateral occlusion or event 6–24 months ago

Uncertain

Retinal TIA

Multiple events, single event within 180 days with contralateral stenosis

Appropriate

All other indications

Uncertain

Mild Stroke

Any indication, surgery performed at any time up to 2 years

Appropriate

Moderate Stroke

Any indication >3 weeks following event, <3 weeks only in presence of contralateral stenosis

Appropriate

All other indications

Uncertain

Stroke in Evolution

Inappropriate

Mild (0 – 49%)

Hemispheric TIA

Crescendo or single events associated with ulcerated stenosis

Uncertain

All other indications

Inappropriate

Hemispheric/ Retinal TIA where refractory to medical treatment

Multiple events associated with ulcerated stenosis

Uncertain

All other indications

Inappropriate

Retinal TIA

All indications

Inappropriate

Mild Stroke

All indications

Inappropriate

Moderate Stroke

All indications

Inappropriate

Stroke in Evolution

All indications

Inappropriate

Acute Occlusion

Hemispheric TIA

Uncertain

Retinal TIA

Multiple events

Uncertain

Single event

Inappropriate

Mild/ Moderate Stroke

Uncertain

Chronic Occlusion

Any Indication

Inappropriate

Vertebro-basilar

TIA

70% stenosis associated with severe incorrectable vertebrobasilar disease

Uncertain