A reason analysis for the disagreement between TCD and DSA in patients with ischemic cerebrovascular diseases caused by intracranial artery stenosis or occlusion

Objective To analysis the disagreement between transcranial Doppler (TCD) and digital subtraction angiography (DSA) in patients with ischemic cerebrovascular diseases caused by intracranial artery stenosis or occlusion. Methods 120 patients with ischemic cerebrovascular diseases were tested by TCD and DSA, the results and the reason of the disagreement were analysed. Results 1304 arteries in 120 patients were examed by TCD, which showed 172 stenotic arteries,156 of which were confirmed with DSA. The sensitivity of TCD examinations for arterial stenosis was 85.7%.The specificity was 98.2%. The false positive rate was 9.3 % , the false negative rate was 2.3 % Conclusions TCD is an important and noninvasive methods for the diagnosis of intracranial artery stenosis. Because of some limits in detecting cerebral vasculature so there is difference in the result of TCD and DSA,Improving the diagnostic techniques can improve, the accuracy.