What are the CCA PSV and ICA/CCA ratio expected with a 70% stenosis?

Prepare for the WCUI/Smith Chason Exit Assessment – Abdomen, Vascular, OB/GYN Test. Enhance your study with flashcards and detailed multiple choice questions, complete with hints and explanations. Master your exit exam with confidence!

Multiple Choice

What are the CCA PSV and ICA/CCA ratio expected with a 70% stenosis?

Explanation:
Velocity criteria in carotid duplex testing are used to gauge stenosis severity. As narrowing becomes significant, the flow accelerates, so the peak systolic velocity in the ICA rises and the ICA/CCA velocity ratio increases. For severe stenosis around 70%, the typical finding is ICA peak systolic velocity above 230 cm/s along with an ICA/CCA velocity ratio above 4.0. This combination best matches the high-grade category, reflecting both the very fast flow through the narrowed segment and the disproportionately higher ICA velocity compared with the common carotid. The other ranges describe milder stenosis (lower velocities and/or lower ratios). So, the best answer corresponds to ICA velocity >230 cm/s and ICA/CCA ratio >4.0.

Velocity criteria in carotid duplex testing are used to gauge stenosis severity. As narrowing becomes significant, the flow accelerates, so the peak systolic velocity in the ICA rises and the ICA/CCA velocity ratio increases. For severe stenosis around 70%, the typical finding is ICA peak systolic velocity above 230 cm/s along with an ICA/CCA velocity ratio above 4.0. This combination best matches the high-grade category, reflecting both the very fast flow through the narrowed segment and the disproportionately higher ICA velocity compared with the common carotid. The other ranges describe milder stenosis (lower velocities and/or lower ratios). So, the best answer corresponds to ICA velocity >230 cm/s and ICA/CCA ratio >4.0.

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