C: Peak systolic velocity greater than 125 cm/s indicates at least 50% ICA stenosis. A peak greater than 230 cm/s indicates at least 70%.
While this patient’s distal left ICA is significantly abnormal, no stenosis is visible.
For a larger image please click on Doppler Ultraspound 3 .
What is a potential cause of retrograde flow within the external carotid artery as seen in this patient?
A) Common carotid occlusion
B) Subclavian steal
C) Acute trauma
For a larger image, please click on Doppler Ultrasound 4 .
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