Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Vascular Boards > chapter 4: doppler waveform analysis > Flashcards

chapter 4: doppler waveform analysis Flashcards

1
Q

capabilities of doppler

A

confirm diagnosis and location of arterial disease

indicate severity of occlusive process

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

limitations of doppler

A

waveforms can be effected by temperature
uncompensated CHF can dampen waveforms
unable to discriminate stenosis from occlusion
technically dependent

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

patient positioning

A

supine with extremities at same level as heart
hip externally rotated
knee slightly bent

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

doppler shift

A

when a wave is reflected from a moving target the frequency of the wave returning is different from the transmitted wave

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

doppler effect occurs with

A

relative motion between the source and the receiver of the sound

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

in the doppler shift what is the moving target

A

blood

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

in the doppler shift what is stationary source

A

transducer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

types of doppler velocietry

A

analog

spectral analysis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

analog

A

employs a zero crossing frequency meter

displays the signals graphically on a strip chart recorded

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

analog paper speed

A

25mm/sec

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

zero crossing frequency meter

A

counts each time the input signal crosses through zero (baseline) within a time span
high frequency waves has many oscillations
low frequency waves have few
machine estimates frequencies and displays them

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

analog dopller velocimetry drawbakcs

A

noise
less sensitivity
high velocities are underestimated
low velocities over estimated

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

spectral analysis

A

individual frequencies are displayed by Fast Fourier Transform FFT method

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

spectral analysis is most commonly used

A

during duplex evaluation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

spectral analysis display

A

time on the X (horizontal) axis and frequency shifts on the Y axis (vertical axis)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

upper extremity doppler is performed on which arteries

A 
subclavian 
axiallary
brachial (at elbow)
radial (thumb side at wrist)
ulnar (5th finger side at wrist)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Lower extremity doppler is performed on which arteries

A 
CFA
SFA
popliteal
PTA (medial malleolus)
DPA (top of foot)
Peroneal (lateral malleolus)
18
Q

potential sources of error

A 
improper probe position
probe motion
incorrect angle of incidence
inadequate amount of gel
excessive pressure on the probe
insufficient period of rest before testing
19
Q

a complete arterial exam includes

A

audible and wave form qualities as well as doppler segmental pressures

20
Q

Normal signals:

A

triphasic waveform

21
Q

triphasic waveform characteristics

A 
rapid upslope
sharp peak
rapid downstroke
flow reversal
resumption of forward flow
22
Q

examples of triphasic waveforms

A

UE and LE arteries

23
Q

Abnormal signals

A

biphasic and monophasic waveforms

24
Q

biphasic waveform characteristics

A 
rapid upslope
sharp peak
fairly rapid downstroke
flow reversal
no resumption of forward flow
can be considered normal in some patients
25
Q

monophasic waveform characteristics

A

slow upslope
rounded peak
slow down stroke
no reversal

26
Q

a monophasic waveform is often obtained where

A

proximal to an obstrcution

27
Q

well collateral occlusions can appear similar to

A

flow distal to a stenosis

28
Q

distal to a stenosis waveforms may appear

A

monophasic and steady

because of vasodilation of distal vessels due to proximal obstruction

29
Q

subclavian artery signal

A

high resistance

multiphasic flow

30
Q

proximal occlusion in subclavian artery wil make the signal

A

more monophasic

31
Q

UE Doppler: Strandness and sumner

A

describe arteriovenous shunts in skin of fingertips that cause flow patterns in hand to be variable

32
Q

Normal doppler waveform post exercise

A

pre-exercise wave form qualities are maintained
no reverse component
usually just pressures obtained post exercise

33
Q

Abnormal doppler waveform post exercise

A

slow upstroke
rounded peak
slow downstroke
no reverse component

34
Q

absent doppler signals post exercise may indicate

A

occlusion or pre-occlusive vessel

35
Q

analog doppler is not capable of portraying velocities of less than

A

6 cm/sec

36
Q

pulsatility index (PI)

A

calculated by dividing the peak-to-peak frequency difference (P1-P2) by mean average frequency

37
Q

Acceleration time is based on the principle that

A

proximal arterial obstruction results in slowing of the time interval between the onset of systole to the point of maximum peak

38
Q

An acceleration time of >133 msec indicates

A

proximal iliac disease

39
Q

inflow disease is

A

ex: aortoiliac disease

represents blood flowing into the lower extremities

40
Q

outflow disease is

A

represents blood flow flowing out into the extremities

ex: femoral-popliteal disease

Vascular Boards (30 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions