Pulse Ox- Applied

Question 1

list the sites where a pulse ox can be used

Answer 1

any viable protuberance…

Question 2

what effect does carboxyhemoglobin have on SpO2?

Answer 2

approaches 90%

Question 3

what effect does methemoglobinemia have on SpO2?

Answer 3

85%

Question 4

how much methemoglobin causes toxicity?

Answer 4

35%

Question 5

name 4 common sources of interference with the pulseox signal

Answer 5

1. dyes
2. ambient light
3. low perfusion
4. venous pulsation

Question 6

how does a pulse ox determine oxyhemoglobin saturation?

Answer 6

it has light emitting diodes (LEDs) that produce red and infrared light. this works becuase Hgb and HgbO2 have different light absorptions

Question 7

what are the light absorptions for red and infrared light?

Answer 7

red = 660nm
infrared = 940nm

Question 8

at what wavelength does HgbO2 absorb?

Answer 8

940-960nm