CCI Vascular Hemodynamics Principles 4

Question 1

The parvus et tardus waveform pattern distal to a stenosis is characterized by:

Accepted Answer

Reduced peak velocity and prolonged systolic acceleration time

Answer

Parvus (small amplitude) and tardus (slow rise) describes the dampened, delayed waveform seen downstream from a significant proximal stenosis.

Question 2

Which vessel wall property primarily determines the capacitance function of the arterial system?

Accepted Answer

Medial smooth muscle compliance

Answer

The elastic recoil of medial smooth muscle allows large arteries to store and release energy, buffering pulsatile flow.

Question 3

In venous hemodynamics, which maneuver is used to assess valve competence during duplex ultrasound?

Accepted Answer

Valsalva maneuver

Answer

Valsalva maneuver increases intra-abdominal pressure and abolishes normal venous flow; reflux upon release indicates valve incompetence.

Question 4

Portal hypertension is most commonly associated with which Doppler finding in the portal vein?

Accepted Answer

Reversal of portal venous flow (hepatofugal)

Answer

Hepatofugal (away from the liver) portal flow reversal is a hallmark of severe portal hypertension caused by cirrhosis.

Question 5

Which equation directly describes the relationship between pressure gradient, flow, and resistance?

Accepted Answer

Ohm's law analog (ΔP = Q × R)

Answer

The hemodynamic analog of Ohm's law states that pressure gradient equals flow multiplied by resistance (ΔP = Q × R).

CCI - Cardiovascular Credentialing International Practice Test