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Cerebrovascular Duplex Examinations Flashcards

7 cards from real CCI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which Doppler spectral finding is MOST consistent with external carotid artery identification during carotid duplex?

    Answer: High-resistance waveform with little or absent diastolic flow

    The ECA supplies high-resistance facial musculature, producing a high-resistance waveform with minimal diastolic forward flow.

  2. Which criterion best distinguishes a 50–69% ICA stenosis from a <50% stenosis using the SRU consensus guidelines?

    Answer: PSV ≥125 cm/s and ICA/CCA ratio ≥2.0

    SRU criteria classify 50–69% ICA stenosis as PSV 125–229 cm/s and ICA/CCA PSV ratio 2.0–4.0.

  3. When assessing for vertebral artery occlusion, which finding would support the diagnosis?

    Answer: Absent color flow and Doppler signal despite optimal technique

    Absent flow signal with proper technique and confirmed vertebral artery visualization on B-mode is indicative of vertebral artery occlusion.

  4. In the evaluation of carotid artery dissection, which duplex finding is MOST commonly observed?

    Answer: Eccentric hypoechoic thickening of the arterial wall with luminal narrowing

    Carotid dissection produces an intramural hematoma seen as eccentric hypoechoic wall thickening that narrows the true lumen.

  5. A post-carotid endarterectomy patient shows a focal PSV of 280 cm/s at the operative site 6 months later. What is the most appropriate interpretation?

    Answer: Likely myointimal hyperplasia causing significant restenosis

    PSV ≥260 cm/s at a CEA site within 2 years typically indicates myointimal hyperplasia–related restenosis, which is the most common early cause of recurrent disease.

  6. Which finding would indicate a hemodynamically significant proximal CCA stenosis or occlusion on duplex examination?

    Answer: Dampened, low-velocity, tardus-parvus waveform distal to the stenosis

    Significant proximal CCA obstruction produces a tardus-parvus (slow-rising, rounded systolic peak with reduced amplitude) waveform distal to the lesion.

  7. Which of the following best describes the sonographic appearance of a carotid body tumor on duplex imaging?

    Answer: Hypervascular mass splaying the ICA and ECA at the bifurcation with high diastolic flow

    Carotid body tumors (paragangliomas) appear as hypervascular solid masses that splay the ICA and ECA apart, demonstrating high-flow Doppler signals.