Strategy | Sensitivity (%) | Specificity (%) | % of stenoses missed | Number to screen to detect one severe stenosis |
---|---|---|---|---|
Test all patients | 100 | 0 | 0 | 8 |
Test those with: | ||||
Ipsilateral bruit | 57 | 90 | 43 | 3 |
Diabetes | 16 | 91 | 84 | 5 |
Previous TIA | 24 | 87 | 76 | 5 |
Not lacunar event | 84 | 32 | 16 | 7 |
Any one of above | 99 | 22 | 1 | 7 |
Any two of above | 65 | 80 | 35 | 3 |
Any three of above | 17 | 97 | 83 | 3 |
TIA=transient ischaemic attack.