Chapter 6: Doppler Waveform Analysis

Question 1

What is the angle of insonation for continous wave doppler

Answer 1

45-60 degrees

Question 2

characteristics of a normal multiphasic (triphasic) waveform

Answer 2

-rapid systolic upstroke
-sharp peak
-rapid mid systolic downstroke
-late systolic flow reversal
-forward diastolic flow

Question 3

characteristics of an abnormal multiphasic (biphasic) waveform

Answer 3

-rapid systolic upstroke
-sharp peak
-perhaps slightly slowed mid systolic downstroke
-late systolic flow reversal
-no forward diastolic flow
-often considered normal
-analog difficult to discern

Question 4

characteristics of an abnormal monophasic waveform

Answer 4

-delayed systolic upstroke
-rounded peak
-slowed mid systolic downstroke
-no systolic flow reversal

Question 5

what is the normal pulsatility index for quantitative doppler waveform? (FFT spectral analysis)

Answer 5

normal >4.0
abnormal <4.0, consistent with at >60% stenosis proximal to sample

Question 6

a delay in the systolic acceleration time means there is an obstruction?

Answer 6

proximal

Question 7

what is the normal acceleration time for lower extremities

Answer 7

normal= 133 milliseconds
abnormal= >133

Question 8

blood flowing into the lower extremities

Answer 8

inflow disease

Question 9

represents blood flow going out into the extremities

Answer 9

outflow disease

Question 10

what is an example of inflow disease

Answer 10

aorto-iliac

Question 11

what is an example of outflow disease

Answer 11

femoral-popliteal