chapter 4 Flashcards
1
Q
capabilities of doppler waveform analysis? (3)
A
helps confirm diagnosis of AOD
differentiates severity
approximates location
2
Q
limitations of doppler waveform analysis? (5)
A
casts or bandages uncompensated heart failure temperature can't discriminate occlusion from stenosis technologist dependent
3
Q
how should the patient be positioned?
A
supine with extremities at same level as the heart, hip rotated and knee bent
4
Q
what is the doppler shift?
A
when the wave is reflected off a moving target the frequency of the received wave differs from that of the transmitted wave
5
Q
what is used to obtain the waveforms?
A
continuous wave doppler
6
Q
waveforms are obtained from? (5)
A
CFA SFA DPA PTA popliteal artery
7
Q
abnormal signals are
A
monophasic
nonpulsatile
absent
8
Q
a monophasic and dampened signal may be obtained where?
A
proximal or distal to obstruction
