VT DVT & Venous Reflux Assessment 2

Question 1

During duplex evaluation of the femoral vein, which finding is MOST consistent with acute DVT?

Accepted Answer

Anechoic, non-compressible lumen with absent color fill

Answer

Acute DVT typically appears anechoic or hypoechoic with failure to compress and absent color flow filling the lumen.

Question 2

Venous reflux in the great saphenous vein (GSV) is defined as retrograde flow lasting longer than:

Accepted Answer

0.5 seconds

Answer

For superficial veins such as the GSV, reflux is defined as retrograde flow exceeding 0.5 seconds with Valsalva or manual compression-release.

Question 3

Which maneuver is BEST used to provoke reflux in the great saphenous vein at the saphenofemoral junction?

Accepted Answer

Valsalva maneuver

Answer

Valsalva increases intra-abdominal pressure, challenging the saphenofemoral junction valve and best provoking GSV reflux at that level.

Question 4

A patient has a positive tourniquet test. This finding suggests venous incompetence at which level?

Accepted Answer

Above the tourniquet placement

Answer

In the tourniquet (Trendelenburg) test, rapid refilling above the occluding tourniquet implies superficial incompetence proximal to that level.

Question 5

Chronic DVT is distinguished from acute DVT on duplex ultrasound primarily by:

Accepted Answer

Vein wall thickening, scarring, and echogenic thrombus

Answer

Chronic DVT shows hyperechoic, organized thrombus with wall thickening, fibrosis, recanalization channels, and reduced vein diameter.

(VT) Vascular Technician Certification Practice Test