Week 8 - Hemodynamics

Question 1

Systolic velocity ____________ as the blood flows to the ankles.

Answer 1

decreases

Question 2

What is the average velocity for the distal EIA?

Answer 2

120 cm/s

Question 3

What is the average velocity for the CFA?

Answer 3

115 cm/s

Question 4

What is the average velocity for the P SFA?

Answer 4

90 cm/s

Question 5

What is the average velocity for the D SFA?

Answer 5

90 cm/s

Question 6

What is the average velocity for the POP A?

Answer 6

70 cm/s

Question 7

What is flow reversal primarily due to?

Answer 7

resistance of the distal vascular bed

Question 8

Vascular beds are __________________ to flow at rest.

Answer 8

highly resistant

Question 9

What happens to the arterioles when you exercise?

Answer 9

they open up and resistance lowers to increase flow

Question 10

What determines the diastolic portion of a velocity waveform?

Answer 10

the resistance of distal vascular beds

Question 11

____________ arteries have normally high resistance at rest

Answer 11

peripheral

Question 12

Low resistance arteries feed what?

Answer 12

the brain, kidney, and liver

Question 13

What factors open arterioles and reduce resistance?

Answer 13

Proximal obstruction
Inflammation
Exercise
ANYTHING that may cause decreased peripheral resistance

Question 14

Describe a pre-stenotic waveform

Answer 14

Normal triphasic, no diastolic flow

Question 15

Describe an in-stenosis waveform

Answer 15

Velocity increases by at least double

spectral broadening

Question 16

Describe a post-stenosis waveform

Answer 16

decreased velocity compared to in-stenosis
Turbulence directly after
spectral broadening
reversed flow under peak
feathered peak
further down = biphasic, monophasic

Question 17

Describe a pre-occlusion waveform

Answer 17

no diastolic flow unless good collaterals present

low velocity

Question 18

Describe an in-occlusion waveform

Answer 18

no signal, no color, b-mode echoes

Question 19

describe a post-occlusion waveform

Answer 19

monophonic, low velocity

Question 20

the ________ portion of a wave indicates inflow

Answer 20

systolic

Question 21

a _________________ of arteriole systole wave indicates significant proximal obstruction

Answer 21

slow upstroke

Question 22

the _____________ portion of a wave indicates resistance of vascular bed

Answer 22

diastolic

Question 23

a ________________ waveform will have diastolic flow on or below the baseline

Answer 23

high resistance

Question 24

a ______________ waveform will have continuous flow above the baseline

Answer 24

low resistance

Question 25

What condition will classically show pendulum flow?

Answer 25

Pseudoanuerysm (PA)