Oxygen analyzers and pulse oxymetry

Question 1

Oxygen Analyzers

Answer 1

monitors O2 concentrations delivered to patients

Question 2

oxygen analyzers rely on what?

Answer 2

Electrochemical interactions

Question 3

2 types of oxygen analyzers

Answer 3

Galvanic Fuel cell and Polargraphic fuel cells

Question 4

Galvanic fuel cell

Answer 4

O2 passes through the teflon membrane–> O2 + H2O makes OH- in the negative electrode–> OH- travels to (+) electrode–> OH- is oxidized –> generates an electrical curent that is measured is proportional to partial pressure of O2 not %

Question 5

Polargraphic fuel cell

Answer 5

Relies on the same process as galvanic fuel cells but the electrical current is proportional to partial pressure and displayed as O2%

Question 6

Pulse oxymetry

Answer 6

a non- invasive means to measure O2 saturation of Hb and HR

Question 7

Pulse oxymetry uses what principle

Answer 7

spectrophotometry

Question 8

How is pulse measured?

Answer 8

periodic measurement of absorbance during systole and diastole. Less transmittance during systole bc of inc blood flow while there’s and increased transmittance during diastole

Question 9

Pulse oxymeter limimtations

Answer 9

• room lighting
• nail polish or intravascular dyes
• Perfusion
• diminished accuracy below 80%
• can’t detect hypoxemia
• dysHb
• pressence of carboxyHb and metHb
• pigmented skin
• motion