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Chapter13 SpO2 Monitoring
13.1 Definition of SpO2 Monitoring
The SpO2 volume recording parameter is used to measure arterial SpO2, i.e., percentage of
oxyhemoglobin. For example, if there are 97% of hemoglobin molecules combining with oxygen
out of the arterial red blood cells, the blood will be described as SpO2 97％, and the SpO2 reading
on the monitor will be 97％. SpO2 values thus can show the percentage of oxygen-attached
hemoglobin molecules (will form oxyhemoglobin), meanwhile, SpO2 volume recording
parameters can also provide the PR signals and volume recording waves.
13.1.1 Principle for Measurement of SpO2 Volume Recording
Parameter
BOS (blood oxygen saturation) is measured and determined in the method of pulse oximetry,
which is a method of measuring and determining the oxyhemoglobin saturation continuously and
without any hurt, mainly used to measure and determine how many rays from the light source of
the sensor penetrate the patient’s tissue (such as fingers or ears) and reach another receiver.
As for the wave length measurable by the sensor, generally the red LED is 660nm and the infrared
LED, 940nm. The maximum selectable output power of LED is 4mW.
The number of penetrated rays rests with many factors where most are constant, but one of these
factors means the arterial flow changes through time because it is pulsant. The arterialized blood’s
BOS can be obtained through measurement of absorbed rays during pulsation. A “volume
recording” waveform and PR signal can be given through detection of pulsation.
“SpO2” value and “Volume Recording” waveform can display on the main screen.
Warning
Where there is carboxyhemoglobin, ferrihemoglobin ordye dilution chemicals, SpO2
value will have a deviation.
13.1.2 BOS/Pulse Monitoring
Warning
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