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Vascular Technology & Hemodynamics Flashcards

7 cards from real CVT 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 waveform characteristic is most indicative of significant proximal arterial stenosis?

    Answer: Monophasic waveform with slow systolic rise and reduced amplitude

    Significant proximal stenosis produces a tardus-parvus waveform that is monophasic with a slow systolic rise (tardus) and reduced peak velocity (parvus).

  2. During a venous duplex exam, a non-compressible femoral vein with absence of phasicity most likely indicates:

    Answer: Acute deep vein thrombosis

    Acute DVT causes the vein to become non-compressible and loses the normal phasic respiratory variation due to intraluminal thrombus.

  3. The ankle-brachial index (ABI) value of 1.3 in a diabetic patient most likely suggests:

    Answer: Non-compressible calcified vessels giving falsely elevated reading

    An ABI greater than 1.3 indicates vessel wall calcification causing incompressibility, which is common in diabetic and renal failure patients, rendering the ABI unreliable.

  4. Which parameter best quantifies the severity of renal artery stenosis on duplex ultrasound?

    Answer: Renal-to-aortic ratio (RAR) greater than 3.5

    A renal-to-aortic ratio (RAR) greater than 3.5 combined with peak systolic velocity >180 cm/s is the standard duplex criterion for significant renal artery stenosis.

  5. During carotid duplex imaging, an ICA/CCA peak systolic velocity ratio greater than 4.0 correlates with what degree of stenosis?

    Answer: 80–99%

    An ICA/CCA PSV ratio >4.0 corresponds to 80–99% stenosis according to the Society of Radiologists in Ultrasound consensus criteria.

  6. The hepatic artery resistive index (RI) is elevated above 0.8 in a liver transplant patient. This finding is most consistent with:

    Answer: Hepatic artery stenosis with elevated downstream resistance

    An elevated RI in the hepatic artery post-transplant suggests increased downstream vascular resistance, often due to hepatic artery stenosis or rejection.

  7. Which maneuver is used to evaluate for subclavian steal syndrome during a vascular ultrasound examination?

    Answer: Arm exercise or blood pressure cuff inflation on the ipsilateral arm

    Arm exercise or cuff inflation/release on the affected side increases demand and provokes reversal of vertebral artery flow, confirming subclavian steal.