CVT Vascular Technology & Hemodynamics 2

Question 1

Which Doppler waveform characteristic is most indicative of significant proximal arterial stenosis?

Accepted Answer

Monophasic waveform with slow systolic rise and reduced amplitude

Answer

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

Question 2

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

Accepted Answer

Acute deep vein thrombosis

Answer

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

Question 3

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

Accepted Answer

Non-compressible calcified vessels giving falsely elevated reading

Answer

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.

Question 4

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

Accepted Answer

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

Answer

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.

Question 5

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

Accepted Answer

80–99%

Answer

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

(CVT) Cardiovascular Technologist Certification Practice Test

(CVT) Cardiovascular Technologist Certification Practice Test

CVT Vascular Technology & Hemodynamics 2