Arterial Flow Characteristics

Question 1

Distal to a stenosis, the arterial resistance will become

Answer 1

Very low to aid in compensating the distal vascular bed for the loss of volume due to the stenosis

Question 2

Changing resistance in vascular beds

Answer 2

Low resistance flow in the distal arms and calf arteries can be caused by vasodilation in the distal vascular beds.
Clenching the hands/toes will increase the resistance in these vascular beds and return the flow pattern in the forearm/ calf to normal triphasic waveform

Question 3

Post stenotic turbulence

Answer 3

Increased peak velocity, spectral broadening, increased diastolic flow

Question 4

High resistance flow results in

Answer 4

A shorter acceleration time

Question 5

Low resistance flow results in

Answer 5

A longer acceleration time

Question 6

If the acceleration time in the femoral artery is increased >140ms

Answer 6

In flow disease is suspected

Question 7

If the acceleration time in the carotid system is reduced

Answer 7

There is a distal obstruction

Question 8

Increasing the sweep speed will

Answer 8

Spread the waveform out to help in obtaining a more accurate acceleration time measurement

Question 9

Arterial waveforms are determined by

Answer 9

Where the artery arises and the structure it feeds