Pulse OX ppt what what bitches

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Total cards: 20•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (20)

Front (Question)

Arterial blood oxygen saturation SaO2 is determined by what

Back (Answer)

by the ratio of oxygenated (Sat Hgb) to deoxygenated hgd

Front (Question)

A SPO1 of 90 is what PaO2

Back (Answer)

Front (Question)

what if the main goal in reading the pulse ox

Back (Answer)

find out what teh pts PaO2 is and if SPO2 is not 100% or things do not match find out why! don’t just give O2

Front (Question)

SpO2 does what to VQ mismatch at higher doses

Back (Answer)

Mask it

Front (Question)

This higher the FiO2 the more you mask what

Back (Answer)

VQ mismatch

Front (Question)

Oxyhemoglobin absorbs what light

Back (Answer)

infra red (940 nm)

Front (Question)

deoxyhemogobin absorbs what light

Back (Answer)

Visible light (660 nm)

Front (Question)

how does the pulse OX work?

Back (Answer)

• Prob with 2 lights one red, one infrared • sensor detects the ratio of red/infra red absorption ratios • detection of absorption during pulsatile flow several times/sec • calc is done from the Beer-Lambert law

Front (Question)

Isobestic point

Back (Answer)

means absorbs at the same point, and represents the worst site to measure (uses with beer-lambert) this is why each oxygenated and de-oxygenated hgb is measured at different numbers

#10

Front (Question)

Advantages of Pulse OX

Back (Answer)

non-invasive easy to apply Continuous monitoring early detection of desat Inexpensive

#11

Front (Question)

SPO2 of 85% = PaO2 what? and will you see cyanosis?

Back (Answer)

55mm nope

#12

Front (Question)

SPO2 of 20% = PaO2 what? and will you see cyanosis?

Back (Answer)

40 mm yes

#13

Front (Question)

Disadvantages of Pulse OX

Back (Answer)

artifact Inaccurate below SPO2 70% rare risk of burns in poor perfusion states

#14

Front (Question)

Lag times ear finger toe

Back (Answer)

ear- 7-20 sec finger- 20-35 sec toe- 40-70 secs

#15

Front (Question)

What type of low flow or low pulsatile flow states cause inaccuries in pulse ox

Back (Answer)

Cardiac bypass hypotension b/p cuff inflation tourniquets vasoconstriction

#16

Front (Question)

a Hgb < ___ gives an underestimation of SPO2

Back (Answer)

<10

#17

Front (Question)

What dyshemoglobins cause pulse ox inaccuracies

Back (Answer)

Carboxyhemoglobin Methemoglobin

#18

Front (Question)

what dyes cause pulse ox Inaccuracies

Back (Answer)

methylene blue indigo carmine (lesser degree)

#19

Front (Question)

What other things can make Pulse OX inaccurate

Back (Answer)

ambient light deep skin pigment electrocautery excessive motion Fingernail polish

#20

Front (Question)

Ficks law states what

Back (Answer)

Diffusion rate of gas is directly proportional to: –Partial pressure gradient –Membrane area –Solubility of gas in membrane Diffusion rate of gas is inversely proportional to: –Membrane thickness –Square root of the molecular weight