Quiz 1 - Grading/Vasc Measurements

Question 1

According to NASCET Index, a 50-69% stenosis of the ICA would demonstrate (4)

Answer 1

• pansystolic spectral broadening
• PSV <125
• EDV <110
• ICA/CCA PSV ratio >2 but <4

Question 2

Using angle correct > 60 degrees could ____ the PSV and subsequently the diagnosis would be potentially inaccurate

Answer 2

overestimate

Question 3

In an 80-99% stenosis of the ICA, we would expect the EDV to be greater than:

Answer 3

140 cm/s

Question 4

If the PSV in the ICA is < 125 cm/s and there is pansystolic spectral broadening, we would grade this as:

Answer 4

16-49%

Question 5

A tardus-parvus waveform indicates (4)

Answer 5

• prox stenosis
• slow rise to peak
• higher diastolic flow than normal
• significant drop in pressure

Question 6

A visual disturbance lasting for several hours that felt like a shade was pulled over her eyes. This phenomenon is called:

Answer 6

Amaurosis Fugax

Question 7

Useful criteria when interpreting the extent of a hemodynamically significant stenosis (4)

Answer 7

• Color aliasing
• High pitched sounds
• Post stenotic turbulence
• Spectral broadening

Question 8

During a carotid Doppler exam, you are faced with a large amount of calcified plaque in the proximal ICA. Since you are unable to assess that zone with Doppler, what could you rely on to predict if there is a hemodynamically significant stenosis?

Answer 8

post stenotic turbulence

Question 9

a critical stenosis defined as

Answer 9

narrowing of the arterial lumen resulting in a hemodynamically significant reduction in pressure, volume and flow defines:

Question 10

Bernoulli’s principle explains the pressure drop distal to a stenosis is due to

Answer 10

energy loss due to turbulent flow

Question 11

T/F Color aliasing is a reliable sonographic sign of a high grade stenosis in the presence of extensive plaque:

Answer 11

true

Question 12

Listening to the doppler signal in the area of the highest velocity in a significant stenosis reveal:

Answer 12

high pitched whistling sound

Question 13

A critical stenosis will have a diameter reduction of: what % and an area reduction of what?

Answer 13

Diameter 50%

area 75%

Question 14

why is the ratio between distal CCA PSV and prox ICA PSV important?

Answer 14

the ratio compensates for a patient with severe heart disease

Question 15

what is a carotid endarterectomy? when is it indicated (2)

Answer 15

It is used to reduce the risk of stroke (removes the plaque from the carotid vessels)

Indicated for people who have
- multiple TIA and blockage of > 50%
or
-Symptomatic people with blockage > 60-70%

Question 16

Power doppler is useful for determining if there is trickle flow in a preocclusive vessel

Answer 16

true