HP CodeMaster XL+ M1722A User Manual page 97

SpO Monitoring (Optional)
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SpO monitoring gives information on both cardiac and respiratory systems, and
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details of oxygen transportation in the body. It is widely used because it is non-
invasive, continuous, easily applied and painless.
The quality of SpO measurements depends on careful application of the sensor.
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Read the following section, "Application Notes" (page 6-1), to understand the
importance of sensor application. For more detailed information, refer to SpO
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Concepts (HP part number M1722-93950).
You can use the SpO monitor with sensors made by other manufacturers as well as
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with HP sensors. For a list of approved sensors, see the Sensor Guide (HP part
number M1722-93970).
SaO and SpO
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Hewlett-Packard is adopting the convention of referring to the SpO parameter.
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Previously it was referred to as SaO .
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SaO is the term used to indicate the oxygen saturation of arterial blood.
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SpO is the term used to indicate the oxygen saturation of arterial blood as
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measured by pulse oximetry.
Application Notes
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The pulse oximetry method used for measuring SpO uses LEDs (light emitting
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diodes) to transmit red and infrared light through suitable peripheral areas of the
body, typically the foot in neonates or the finger in adults. The oxygen saturation is
gauged by measuring the "redness" of the blood in the arterial pulse.
A photodetector positioned opposite the light emitter compares light absorption
before and after pulsation to provide measurements that are displayed on the
monitor. If there is no pulse, measurements cannot be made. See the following
figure.
6-1