CVT Vascular Technology & Hemodynamics 3

Question 1

In Poiseuille's law, if the radius of a vessel is halved, the resistance to flow will:

Accepted Answer

Increase 16-fold

Answer

Poiseuille's law states resistance is inversely proportional to the fourth power of the radius, so halving the radius increases resistance 16-fold (2^4 = 16).

Question 2

A patient with an abdominal aortic aneurysm (AAA) has swirling color Doppler flow within the sac. This turbulent flow pattern is caused by:

Accepted Answer

Flow separation and recirculation within the dilated segment

Answer

Aneurysmal dilation disrupts laminar flow, causing flow separation at the dilated walls and recirculation eddies visible as swirling color Doppler patterns.

Question 3

Which finding on mesenteric duplex ultrasound suggests significant celiac artery stenosis?

Accepted Answer

Peak systolic velocity greater than 200 cm/s with post-stenotic turbulence

Answer

A celiac artery PSV greater than 200 cm/s with post-stenotic turbulence is the threshold for hemodynamically significant stenosis on mesenteric duplex.

Question 4

The normal spectral waveform of the superior mesenteric artery (SMA) in the fasting state is best described as:

Accepted Answer

High-resistance with absent or reversed diastolic flow

Answer

The fasting SMA has a high-resistance waveform with absent or minimal diastolic flow because the intestinal vascular bed is constricted when not digesting.

Question 5

Which color Doppler aliasing pattern indicates the presence of a high-velocity stenotic jet?

Accepted Answer

Mosaic pattern of mixed colors with brightness at the stenosis

Answer

A mosaic color pattern with a bright core at the stenosis indicates aliasing and flow disturbance caused by a high-velocity jet exceeding the Nyquist limit.

(CVT) Cardiovascular Technologist Certification Practice Test

(CVT) Cardiovascular Technologist Certification Practice Test

CVT Vascular Technology & Hemodynamics 3