Chapter 4
| Monitoring
©2007-2015 Physio-Control, Inc.
LIFEPAK 15 Monitor/Defibrillator Operating Instructions
71
Possible Equipment Damage
Do not soak or immerse the sensors or cables in any
liquid solution. Do not attempt to sterilize.
No Implied License
Possession or purchase of the pulse oximeter does not convey any expressed or implied license
to use the pulse oximeter with unauthorized sensors or cables which would, alone or in
combination with this device, fall within the scope of one or more of the patents relating to this
device.
How a Pulse Oximeter Works
A pulse oximeter sensor directs light through a patient’s fleshy body site (usually a finger or toe).
The sensor sends wavelengths of light from the emitter to the receiving detector as shown in the
following figure.
Figure 25
How a Pulse Oximeter Works
FIGURE LEGEND
1
Cable
4
Light-emitting diodes
2
Sensor (holds LEDs and detector)
5
Infrared
3
Red
6
Light-receiving detector
The pulse oximeter translates the amount of light received by the detector to the various forms
of hemoglobin saturation levels and displays them as SpO
2
, SpCO, and SpMet percentages.
Normal values for SpO
2
typically range from 95% to 100%. Normal values for SpCO are typically
less than 9% (the higher range of normal is often seen in smokers). Normal values for SpMet are
typically less than 2% and may be caused by exposure to some pharmaceuticals including local
anesthetic agents and chemical agents such as nitrites.
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