Agreement between non-invasive procedures and digital subtraction angiography for surgery for asymptomatic carotid stenosis (had it been symptomatic)
| DSA | |||||
|---|---|---|---|---|---|
| Non-invasive technique | Operable | Not operable | Sensitivity | Specificity | |
| *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 angiography | Operable | 0 | 0 | ||
| Not operable | 3 | 31 | 0* | 1.00 | |
| MR angiography | Operable | 2 | 2 | ||
| Not operable | 1 | 29 | 0.67* | 0.94 | |
| Doppler | Operable | 3 | 4 | ||
| Not operable | 0 | 27 | 1.00* | 0.87 | |