SpO
2
Monitoring
12-8
NOTE
z If the sensor cannot be positioned accurately to the part to be measured,
it may result in inaccurate SpO
2
reading, or the SpO
2
even cannot be
measured because no pulse is detected. In this case, you must position
the sensor again.
z The excessive patient movement may result in inaccurate reading. In
this situation, you must keep the patient quiet or change the measured
position to reduce the adverse influence of excessive movement.
WARNING
z In the process of extended and continuous monitoring, you should
check the peripheral circulation and the skin every 2 hours. If any
unfavorable change takes place, you should change the measured
position in time.
z In the process of extended and continuous monitoring, you should
periodically check the position of the sensor. In case that the position of
the sensor moves during monitoring, the measurement accuracy may be
affected.
12.2.4 Measurement Limitations
If the accuracy of any measurement does not seem reasonable, first check the
patient’s vital signs by an alternate method. Then check the instrument for proper
function. Inaccurate measurements may be caused by:
îš„ Improper SpO
2
sensor;
îš„ High-frequency electrical noise, including noise created by the host system, or
noise from external sources, such as electrosurgical apparatus connected to the
system;
îš„ Oximeters and oximetry sensors used during magnetic resonance imaging
(MRI) scanning. Induced current could potentially cause burns;
îš„ Intravascular dye injections;
îš„ Excessive patient motion;
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