•
Concentration of dysfunctional hemoglobin, such as carboxyhemoglobin and
methemoglobin;
•
SpO2 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 (HbO2) and deoxyhemoglobin to the light of special
wavelength may also affect SpO2 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 SpO2 reading.
12.2.5 SpO2 Setup Menu
Selecting the SPO2 label in the parameter window opens the following menu.
Figure 12-3 SpO2 Setup Menu
You can perform the following settings in this menu.
•
ALM SpO2 alarm on/off status
ON: When a SpO2 alarm occurs, the monitor gives alarm
indications and stores the alarm;
OFF: When a SpO2 alarm occurs, the monitor neither gives
alarm indications nor stores the alarm;
When OFF is selected, the
icon is displayed on the right
of the SPO2 label.
12-5
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