CCI Vascular Hemodynamics Principles 3

Question 1

Which of the following best describes the effect of arterial compliance on pulse wave velocity?

Accepted Answer

Lower compliance increases pulse wave velocity

Answer

Stiffer (less compliant) arteries transmit the pressure wave faster, resulting in higher pulse wave velocity.

Question 2

The resistive index (RI) is calculated as:

Accepted Answer

(PSV − EDV) / PSV

Answer

RI = (peak systolic velocity − end diastolic velocity) / peak systolic velocity, ranging from 0 to 1.

Question 3

In a patient with a large arteriovenous fistula, which hemodynamic change is expected in the feeding artery?

Accepted Answer

Decreased RI with high diastolic flow

Answer

An AV fistula creates a low-resistance pathway, producing low RI and elevated diastolic flow in the feeding artery.

Question 4

Which hemodynamic phenomenon causes spectral broadening distal to a stenosis?

Accepted Answer

Post-stenotic turbulence

Answer

Post-stenotic turbulence produces a wide range of velocities that fill in the spectral window, causing spectral broadening.

Question 5

A patient has an ABI of 0.6 at rest. According to standard classification, this corresponds to:

Accepted Answer

Moderate PAD

Answer

An ABI of 0.4–0.69 is classified as moderate peripheral arterial disease with significant flow limitation.

CCI - Cardiovascular Credentialing International Practice Test