SpO
2
Monitoring
12-9
Excessive ambient light;
Improper sensor installation or incorrect sensor placement on the patient
Sensor temperature (optimal temperature is between 28℃ and 42℃);
The sensor is placed on a limb that is attached to a blood pressure cuff, arterial
catheter, or intravascular line;
Concentration of dysfunctional hemoglobin, such as carboxyhemoglobin and
methemoglobin;
SpO
2
too low;
Low circular perfusion of the applied part;
Shock, anemia, low temperature and application of vasomotor all reduce the
arterial blood flow and may affect the pulse oximetry measurement.
The absorption of oxyhemoglobin (HbO
2
) and deoxyhemoglobin to the light of
special wavelength may also affect SpO
2
measurement. If there exist other
substances (like carbon hemoglobin, methemoglobin, methylene blue and indigo
carmine) absorbing the light of the same wavelength, they may result in false or low
SpO
2
reading.
12.2.5 SpO
2
Setup Menu
Selecting the SPO
2
label in the parameter window opens the following menu.
Figure 12-6 SpO
2
Setup Menu
You can perform the following settings in this menu.
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