Table 5

Agreement between non-invasive procedures and digital subtraction angiography for surgery for asymptomatic carotid stenosis (had it been symptomatic)

Non-invasive techniqueOperableNot operableSensitivitySpecificity
*Sensitivities not reliable owing to small numbers of operable stenoses.
Operable, 80–99% stenosis; not operable, 0–79% or 100% stenosis.
CT, computed tomography; DSA, digital subtraction intra-arterial angiography; MR, magnetic resonance.
CT angiographyOperable00
Not operable3310*1.00
MR angiographyOperable22
Not operable1290.67*0.94
Not operable0271.00*0.87