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Inaccurate measurements can be caused by:
Incorrect application of the sensor.
Placement of the sensor on an extremity with a blood
pressure cuff, arterial catheter, or intravascular line.
Excessive patient activity.
Intravascular dyes, such as indocyanine green or
methylene blue.
Externally applied coloring, such as nail polish or
pigmented cream.
Failure to cover the sensor site with opaque materials
in high ambient light conditions.
Venous pulsation.
Dysfunctional hemoglobin.
Low perfusion.
Loss-of-pulse signal occurs for the following reasons:
The sensor is applied too tightly.
Defibrillation.
A blood pressure cuff is inflated on the same extremity
as the one with the sensor attached.
There is arterial occlusion proximal to the sensor.
Poor peripheral perfusion.
Loss of pulse/cardiac arrest.
To use the sensor:
Select an appropriate sensor.
Apply the sensor as directed, and observe all warnings
and cautions presented in the sensor user manual.
Clean and remove any substances, such as nail polish,
from the application site.
Periodically check to ensure that the sensor remains
properly positioned on the patient.
High ambient light sources that can interfere with the performance
of the sensor are:
Surgical lights (especially those with a xenon light
source).
Bilirubin lamps.
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