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Warning
In the long-term continuous monitoring process, check the peripheral circulation and
skin condition of the measuring part every 2 hours or so. If adverse changes are
found, the measuring part should be changed in time.
In the process of long-term continuous monitoring, the positioning of the probe
should be checked periodically to avoid the change of the probe positioning caused
by moving and other factors, which will affect the accuracy of measurement.
7.3 SpO2 Monitoring Measurement Limit
During the operation, the following factors can affect the accuracy of blood oxygen
saturation measurement:
•
High frequency electrical interference, such as the interference generated by the
host system itself or the interference from the electrical instruments connected to
the system.
•
Do not use photoelectric oximeter and oxygen sensor during MRI scanning.
Induced current may cause burns.
•
Intravenous dye.
•
Active animal.
•
External light radiation.
•
Improper installation of sensor or improper contact with object.
•
Sensor temperature (the best temperature should be in the range of 28 ℃ ~
42 ℃).
•
Placing the sensor on the limb with blood pressure cuff, arterial catheter or
endovascular tube.
•
The concentration of non-functional haemoglobin such as carboxyhaemoglobin
(COHb) and MetHb.
•
Low oxygen saturation.
•
The circulation perfusion of the test site was poor.
•
Shock, anaemia, hypothermia and vasoconstrictor drugs may reduce the arterial
blood flow to an unmeasurable level.
•
The measurement also depends on the absorption of specific wavelengths of
light by oxyhaemoglobin and reduced haemoglobin.
•
If there are other substances absorbing the same wavelength, they will lead to
false or low SpO2 values. Such as: carbohaemoglobin, methaemoglobin,
methylene blue, indigo carmine.
•
It is recommended to use the SpO2 sensor described in the attachment.
7.4 SpO2 Alarm Information
Physiological alarm, technical alarm and prompt information that may occur in
module measurement are listed in the table below.
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