ARDMS SPI Hemodynamics and Vascular Flow Principles 2

Question 1

The pulsatility index (PI) is calculated as:

Accepted Answer

(PSV − EDV) / mean velocity

Answer

PSV / EDV

Answer

EDV / PSV

Answer

(PSV + EDV) / PSV

Question 2

Which Doppler finding is most indicative of a hemodynamically significant proximal arterial stenosis?

Accepted Answer

Monophasic, low-resistance tardus-parvus waveform distal to the stenosis

Answer

Increased peak systolic velocity at the stenosis site

Answer

High-resistance waveform distal to the lesion

Answer

Normal triphasic waveform distal to the lesion

Question 3

Poiseuille's Law states that blood flow through a vessel is most sensitive to changes in which parameter?

Accepted Answer

Vessel radius

Answer

Vessel length

Answer

Blood viscosity

Answer

Pressure gradient

Question 4

In a normal hepatic vein Doppler waveform, the waveform is expected to be:

Accepted Answer

Triphasic with both antegrade and retrograde components reflecting cardiac pulsatility

Answer

Monophasic and continuous

Answer

Biphasic with antegrade flow only

Answer

High-resistance triphasic arterial pattern

Question 5

The spectral window in a normal arterial Doppler waveform represents:

Accepted Answer

The clear area below the spectral envelope indicating organized laminar flow

Answer

The area of aliased velocities

Answer

Turbulent flow within the vessel

Answer

Reverse flow component

Question 6

Elevated end-diastolic velocity (EDV) in an arterial waveform typically indicates:

Accepted Answer

Low downstream vascular resistance (high diastolic demand)

Answer

High downstream vascular resistance

Answer

Arterial vasospasm

Answer

Proximal arterial occlusion