Optimizing Spo 2 Measurement Performance - Philips IntelliVue TRx Instructions For Use Manual

Optimizing SpO Measurement Performance
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Optimizing SpO
Refer to this section on problem situations if you have difficulty getting a signal
or obtaining accurate measurements.
Distortion
Ambient light, motion, perfusion or incorrect sensor placement can affect the
accuracy of the derived measurements.
Arterial Blood Flow
The measurement depends on the pulsatile nature of blood flow in the arteries
and arterioles; with the following conditions arterial blood flow can be reduced
to a level at which accurate measurements cannot be made:
Wavelength Absorption
The measurement also depends on the absorption of particular light wavelengths
by the oxyhemoglobin and reduced hemoglobin. If other substances are present
which absorb the same wavelengths, they will cause a falsely high, or falsely
low SpO
*These chemicals are used in dye dilution cardiac output calculations.
Ambient Light
Very high levels of ambient light can also affect the measurement; an "SpO
Interference" message will appear on the display. The measurement quality can
be improved by covering the sensor with suitable opaque material.
8-22 SpO Monitoring
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Draft - 1 Aug 08
Measurement Performance
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• shock
• hypothermia
• use of vasoconstrictive drugs
• anemia
value to be measured. For example:
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• carboxyhemoglobin
• methemoglobin
• methylene blue
• indocyanine green*
• indiocarmine*
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