Abstract T P49: Diagnosis of Carotid Artery Near-Occlusion in Computed Tomography Angiography Compared to Catheter Angiography - Validation of Criteria and Implications for Clinical Practice

BACKGROUND/PURPOSE: Patients with near-occlusion (NO) of the internal carotid artery (ICA) are suggested to benefit from an exclusive therapeutic stratification. We intended to verify computertomography angiography (CTA) criteria for NO-detection by the catheter angiography (CA) reference and to investigate the impact of NO upon diagnosis of 70%-NASCET stenosis. We hypothesized, that selected CTA-criteria are non-inferior to detect NO compared to CA. METHODS: Two independend observers analysed DICOM-images of 115 ICA stenoses obtained by multislice CTA and selective CA. Reference-NO’s were identified in CA by applying established criteria. Lumen measures and indizes previously applied to CTA , the minimal luminal diameter (MLD), the distal ipsilateral ICA (diICA) and the ratios between diICA and distal contralateral ICA (diICA : dcICA) and the diICA and ipsilateral external carotid artery (diICA : iECA) were validated against the CA-defined NO by receiver operator characteristic analysis (ROC). RESULTS: T...