Doppler Waveform Analysis (CH. 4 Rumwell) Flashcards
1
Q
Disadvantages of analog method:
A
Not as sensitive, sensitive to noise/movement, underestimates high velocities and overestimates low velocities
2
Q
Advantages of spectral analysis?
A
More accurate, more sensitive, displays multitude of frequencies
3
Q
Monophasic/dampened signals occur:
A
Prox. and distal to stenosis
4
Q
For UE pressure, values between RT and LT should be:
A
less than 15 mmHg difference
5
Q
UE presure values should be no more than ____ btwen each level:
A
15 mmHg
6
Q
How to solve for pulsatility index?
A
Peak to peak frequency divided by mean frequency
7
Q
Prox to disease, PI ____; Distal to disease PI _____.
A
increases prox, decreases distal
8
Q
Normal PI of the CFA and popliteal?
A
> 5.5 & = 8
9
Q
An AT > 133 msec in the CFA signifies:
A
iliac dz
