Digit Plethysmography and Pressure

Question 1

digit plethysmography detects ___

Answer 1

cutaneous blood flow

Question 2

digit plethysmography photocell uses (2)

Answer 2

light-emitting diode (LED)
photosensor

Question 3

digit plethysmography

volume of blood content in tissues results in ___

Answer 3

increased attenuation (decreased reflected light)

Question 4

toe pressures are typically not affected by ___

Answer 4

medial calcification

Question 5

plethysmography

quality of waveforms is greatly affected by (3)

Answer 5

1. patient must be resting in a basal state, warm room
2. cuff and/or photocell placement
3. extremity tremors, bandages

Question 6

digit plethysmography patient position

toes -
fingers -

Answer 6

toes - supine, head slightly elevated
fingers - sitting with arms resting on a pillow (heart level)

Question 7

photocell is attached to the ___ aspect of the toe or finger

Answer 7

plantar aspect

Question 8

abnormal resting waveforms, pressures, PPG, and PVR waveforms =

Answer 8

fixed obstruction

Question 9

normal resting waveforms with a change to abnormal findings =

Answer 9

functional (vasospastic) disease

Question 10

finger brachial index

normal
abnormal

Answer 10

normal 0.8 - 0.9
abnormal < 0.8

Question 11

toe brachial index (TBI)

normal
abnormal

Answer 11

normal > 0.75
abnormal < 0.66

Question 12

absolute toe pressure is a better predictor of ___

Answer 12

healing potential

poor healing potential < 30mmHg

Question 13

cold stress

hands are immersed in ice for ___
waveforms and pressures are obtained immediately and in ___

Answer 13

immersed in ice for 3 minutes
waveforms and pressures are obtained immediately and in 5 mintues

Question 14

cold stress

positive test =

Answer 14

waveforms do not return to baseline within 5 minutes