Plethysmography

Question 1

plethysmography in combination with Doppler segmental pressures, helps to differentiate ___

Answer 1

true arterial claudication from nonvascular sources

Question 2

plethysmography is most often used to evaluate (2)

Answer 2

digits
penile vasculature

Question 3

normal plethysmographic waveform

Answer 3

sharp, systolic peak with dicrotic wave

Question 4

mildly abnormal plethysmographic waveform

Answer 4

sharp peak, absent dicrotic wave
downslope bowed away from baseline

Question 5

moderately abnormal plethysmographic waveform

Answer 5

flattened systolic peak, absent dicrotic wave
upstroke and downslope time decreased and nearly equal

Question 6

severely abnormal plethysmographic waveform

Answer 6

low amplitude or absent

Question 7

volume plethysmography is also known as ___

Answer 7

pneumo/true plethysmography

Question 8

photoplethysmography (PPG) detects ___ and records ___

Answer 8

detects blood flow
records pulsations

Question 9

in AC mode, PPG records in ___ waveforms

Answer 9

pulse

Question 10

photoplethysmography (PPG) is more commonly used to obtain ___ pressures

Answer 10

toe pressures

Question 11

cold-stress testing is ideal in cases with ___

Answer 11

true vasospasm

Question 12

during cold-stress testing, the hands/feet are submerged in ice-cold water for ___ mins

Answer 12

3 minutes

Question 13

abnormal cold-stress test waveforms take longer than ___ mins to return to baseline

Answer 13

> 5 minutes

Question 14

normal finger/brachial index

Answer 14

0.8 - 0.9

Question 15

normal toe pressures are 60% to 80% of the ___ pressure

Answer 15

toe pressure = (60-80%) brachial pressure

Question 16

fixed occlusive disease is characterized by abnormal (3)

Answer 16

Doppler arterial signals
systolic pressure
PPG tracings

Question 17

intermittent obstructive disease is characterized by (2)

Answer 17

normal Doppler, systolic pressure, PPG tracings
abnormal readings after cold stimulation

Question 18

Raynaud’s phenomenon waveform shows a ___

Answer 18

peaked pulse

Question 19

vasospasm waveform shows

Answer 19

decreased amplitude & multiple oscillations on the downslope

Question 20

3 limitations of plethysmography

Answer 20

1. cannot be specific to a single vessel
2. may be difficult to distinguish between major arteries and collaterals
3. obesity