Avtor/Urednik     Breznik, Silva
Naslov     Merjenje zožitve notranje karotidne arterije: primerjava ultrazvoka z digitalno subtrakcijsko angiografijo in 3D CT prostorninsko rekonstrukcijsko tehniko
Tip     monografija
Kraj izdaje     Ljubljana
Založnik     Medicinska fakulteta
Leto izdaje     2003
Obseg     str. 30
Jezik     slo
Abstrakt     Background: Color coded duplex imaging is increasingly used as the only investigation before carotid interventions, although the nature of measuring the stenosis with ultrasound suggests that the method may not be accurate in high grade stenoses. Aim: The purpose of the present study was to compare the accuracy and usefulness of the ultrasound (US) measurements of internal carotid artery (ICA) stenosis by comparing a relationship between preoperative duplex US findings, DSA findings and helical computed tomography (CT) with volume rendering in symptomatic patients with high grade ICA stenosis. Methods: Duplex US ICA stenosis was assessed according to combined Strandness' criteria. DSA and 3D CT stenosis was measured using NASCET method. Kappa statistics and BlandAltman statistics were used for comparison. Results: Agreement on the degree of ICA stenosis was statistically good for DSA and 3D CT (kappa=0.80). Comparison between DSA and 3DCT showed 95 % limits of agreement of around 50 percentage points. Comparison of duplex US with DSA or 3D CT showed fair to good 95 % limits of agreement (kappa 0.70 and 0.72). Clinical agreement was poor. Between DSA and 3D CT the operative misclassification rate was 3%. Operative misclassification rate between duplex US and DSA or 3D CT was rather high 12%. Conclusions: Doppler US tends to differ at the high end of the high grade stenosis band (90%-occlusion) underestimating (as compared to DSA) the degree of stenosis. Variations between DSA or 3D CT and duplex US are significant. This suggests that by patients with high grade stenosis of ICA indication for operation could not be made on the ground of duplex US measurements only.
Deskriptorji     CAROTID STENOSIS
CAROTID ARTERY, INTERNAL
TOMOGRAPHY, X-RAY COMPUTED
ULTRASONOGRAPHY, DOPPLER, DUPLEX