PulseOX

Question 1

What 2 things are important to have when trusting the reading from a PulseOx?

Answer 1

The HR matches the palpated pulse.

Peaks and Valleys on the Waveform.

Question 2

What are 2 EKG conditions can alter a reading from a PulseOx?

Answer 2

PVC-wont give a pulse due to inadequate filling

PEA-Electrical activity from heart that doesn’t result in cardiac output.

Question 3

What is an alternative site for a pulseox when experiencing poor perfusion or hypotension?

Answer 3

the ear due to brain being a priority for blood flow.

Question 4

At the Sp02 percent is a pulseox not reliable?

Answer 4

80%

Question 5

What is the accuracy of a pulseox?

Answer 5

plus 3 minus 3

Question 6

What happens to a pulseox reading in the presence of MetHb?

Answer 6

MetHb levels of 10% or higher will result in SpO2 ~85%

MetHb levels less than 10% will result in SpO2 reduction by ~ ½ of the measured MetHb%

Question 7

What values can be shown on a Co-Oximeter?

Answer 7

Oxyhemoglobin
Deoxyhemoglobin
Carboxyhemoblobin
Methemoglobin

Question 8

What are the 2 ways a pulseox measures?

Answer 8

Spectrophotometry and photoplethysmography

Question 9

What are the wavelengths that are read by the pulse ox?

Answer 9

660nm = Red (Deoxygenated Blood)
940nm = infrared (Oxygenated Blood)
So whatever returns the most, means that there is not a lot absorbing it. (less amount of that Cell)

Question 10

What are the 2 ways that a pulseox transmits light through tissue?

Answer 10

Transmittance (finger) and Reflectance (Forehead)