week 7 radiation etc.

Question 0

all types of radiation travel at the same __, but vary in frequency and wavelength

Answer 0

speed

Question 1

Photons have __ mass, they are pure energy

Answer 1

no

Question 2

what is the frequency of visible light?

Answer 2

400-700 nm

Question 3

Beer-Lambert law is used to calculate __

Answer 3

pulse oximetry

Question 4

oxygenated hemoglobin absorbs __ with a wavelength of __ nm

Answer 4

infrared
990 nm

990 makes me think of an SpO2 of 99%, if someone has a pulse ox of 99% they are well oxygenated.

Question 5

deoxygenated hemoglobin absorbs the visible red wavelengths and has a wavelength of __ nm

Answer 5

660 nm

If your pulse ox reads 66%, you are deoxygenated

Question 6

what two principles are combined in the pulse oximeter to measure oxygen sats in arterial blood?

Answer 6

oximetry and plethysmography

Question 7

are there any contraindications to pulse oximetry?

Answer 7

no

Question 8

four low perfusion states that can cause pulse ox artifact?

Answer 8

low cardiac output
anemia
hypothermia
increased systemic vascular resistance

Question 9

what can give you a false pulse ox reading?

Answer 9

carboxyhemoglobin
methemoglobinemia
low oxygen sats
excessive ambient light or overhead infrared light
tremors or vibrations of patient
methylene blue dye
venous pulsations
deeply pigmented skin
fingernail polish
light leaking from source to detector

Question 10

can a pulse ox detect a ventilation:perfusion mismatch?

Answer 10

yes, when the PaO2 decreases below 100 mmHg

Question 11

what is the best monitor to detect a disconnection?

Answer 11

capnography and spirometry, then pulse ox and stethoscope

Question 12

what is the difference between PaO2 and SaO2?

Answer 12

SaO2 = saturation of arterial hemoglobin with oxygen as a %

PaO2 = partial pressure of oxygen in arterial blood