cw doppler, abi's, segmental pressures Flashcards
what is the purpose of arterial physiologic exams ?
presence, severity, location, changes, hemodynamically significant
Name the 5 arterial physiologic techniques
- cw doppler
- abi’s
- segmental pressures,
- volume pulse recordings (vpr)
- photoplethysmography
what does cw doppler mean?
continuous wave
The difference in the frequencies in Cw Doppler is called what?
Doppler shift
The Doppler shifted frequency is _____________ to the __________.
proportional, velocity of the blood
When using CW Doppler, what can the Doppler tell you about the blood?
direction of the blood flow
what two ways show the changes in velocity and direction of flow, in CW Doppler?
- audible (can hear)
2. ANALOG WAVEFORM
What Doppler size probe is used in Cw?
8-10 MHZ
For heavier patients whose arteries are deeper, what type of probe should you use?
a lower frequency Doppler probe
what are common locations to obtain cw Doppler waveform ?
dpa, pta, pop, cfa
PERO (rarely)
FA (some labs skip)
Name some common techniques to find cw doppler
- place probe where you would feel the pulse
- probe pointed toward heart resting in a bed of acoustic gel
- keep a 45-60 degree angle to the skin
At least how many waveforms should you demonstrate, when doing a cw doppler?
at least 3 waveforms
What do interpretable waveforms show?
clean lines
show baseline
eliminate artifacts
what does a CW Doppler interpretation tell you?
- Presence of hemodynamically significant obstruction or normal
- severity of decrease of perfusion due to obstruction
What are the segmental locations of h.s obstructions ?
Aorto- illiac (aka inflow)
Femoral- Popliteal
intrapopliteal (tibial vessel)
