CVT Vascular Technology & Hemodynamics 4

Question 1

Which duplex finding best differentiates a pseudoaneurysm from a true aneurysm of the femoral artery?

Accepted Answer

To-and-fro flow pattern in the neck connecting the lesion to the artery

Answer

A pseudoaneurysm demonstrates a characteristic to-and-fro (yin-yang) Doppler signal in its neck, reflecting systolic filling and diastolic outflow back into the artery.

Question 2

Segmental limb pressures showing a drop of greater than 20 mmHg between adjacent levels is considered significant for:

Accepted Answer

Arterial occlusive disease at the level between the measurements

Answer

A pressure gradient greater than 20 mmHg between adjacent segmental levels indicates hemodynamically significant arterial occlusive disease between those measurement points.

Question 3

In carotid duplex imaging, the presence of a 'string sign' refers to:

Accepted Answer

Severely narrowed residual lumen with a thin trickle of flow in near-total occlusion

Answer

A string sign describes the thread-like residual lumen seen in near-total internal carotid artery occlusion, with only a thin trickle of color Doppler flow visible.

Question 4

During a lower extremity venous exam, which maneuver best evaluates for popliteal vein reflux?

Accepted Answer

Distal calf compression and release with patient standing

Answer

Distal calf augmentation followed by sudden release, performed with the patient standing or in reverse Trendelenburg, produces retrograde flow that reveals popliteal valve incompetence.

Question 5

The vertebral artery Doppler waveform shows complete reversal of flow direction. This is diagnostic of:

Accepted Answer

Complete subclavian steal syndrome

Answer

Complete reversal of vertebral artery flow direction indicates complete subclavian steal, where the ipsilateral arm's demand reverses vertebral flow to bypass a proximal subclavian occlusion.

(CVT) Cardiovascular Technologist Certification Practice Test

(CVT) Cardiovascular Technologist Certification Practice Test

CVT Vascular Technology & Hemodynamics 4