RVT Peripheral Venous Testing 2

Question 1

Which duplex ultrasound finding is most diagnostic of acute deep vein thrombosis (DVT)?

Accepted Answer

Non-compressibility of the vein lumen

Answer

Absence of color flow in the vein

Answer

Increased echogenicity of the vessel wall

Answer

Loss of phasic flow with respiration

Question 2

When performing a lower extremity venous duplex exam, which vein is typically evaluated at the popliteal fossa?

Accepted Answer

Small saphenous vein and popliteal vein

Answer

Great saphenous vein and femoral vein

Answer

Anterior tibial vein and peroneal vein

Answer

Gastrocnemius vein only

Question 3

A patient presents with a swollen leg and pain. Duplex shows a hyperechoic, non-occlusive thrombus floating freely in the common femoral vein. What is the clinical concern?

Accepted Answer

Free-floating thrombus with high pulmonary embolism risk

Answer

Chronic DVT with recanalization

Answer

Extrinsic compression from lymph node

Answer

Venous insufficiency with reflux

Question 4

Which Doppler waveform characteristic indicates normal venous patency in the common femoral vein?

Accepted Answer

Spontaneous phasic flow varying with respiration

Answer

Continuous non-phasic flow

Answer

High-resistance triphasic arterial pattern

Answer

Absence of flow at rest with augmentation only

Question 5

During a venous reflux study, what duration of retrograde flow in the great saphenous vein is considered pathological?

Accepted Answer

Greater than 1.0 second

Answer

Greater than 0.5 seconds

Answer

Greater than 2.0 seconds

Answer

Any detectable retrograde flow

Question 6

Which maneuver is most appropriate to assess venous reflux in the lower extremity during a duplex exam?

Accepted Answer

Distal limb compression and release

Answer

Valsalva maneuver

Answer

Proximal limb compression

Answer

Elevation of the limb above heart level

Question 7

What is the significance of a 'blunted' or non-phasic Doppler waveform in the common femoral vein?

Accepted Answer

Suggests proximal obstruction such as iliac vein DVT

Answer

Normal variant in obese patients

Answer

Indicates arteriovenous fistula

Answer

Caused by deep breathing technique