Defining Ultrasound Criteria for In-Stent Restenosis of the Carotid Artery Using Computed Tomography Angiography

Abstract

Duplex ultrasound (DUS) velocity measurement is the preferred method for evaluating carotid artery stenosis. However, DUS velocity criteria determined from native carotid arteries are not applicable to internal carotid artery (ICA) stents. Previously, catheter-based angiography was used to determine the DUS criteria for in-stent restenosis (ISR), but conventional angiography is invasive and can be limited. This study sought to define DUS velocity criteria for predicting ≥60% internal carotid ISR by correlating the in-stent velocities with the computed tomography angiography (CTA) measurements of the percentage of stenosis.