What are the optimal duplex ultrasound criteria to determine in-stent stenosis in patients with stented carotid arteries?
Revised duplex ultrasound criteria with higher velocity thresholds are necessary to accurately determine in-stent stenosis in carotid arteries.
PSV and ICA/CCA increase with stenosis to a greater extent in stented carotid arteries, necessitating revision of existing US criteria to follow CAS patients. To determine > or = 70% in-stent stenosis, PSV > or = 350 cm/s and ICA/CCA ratio > or = 4.75 are sensitive criteria. To determine > or = 50% stenosis, combining PSV > or = 225 cm/s and ICA/PCA ratio > or = 2.5 is optimal.
Stanziale et al. (Wed,) studied this question.