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M3 Vital Signs Monitor User Manual SpO

Monitoring (Optional)

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2 Inspect the sensor to ensure that the light emitter and receiver are aligned with each

other and there is no gap between the sensor and the finger. All the light emitted by

the light emitter must pass through the patient's tissue. The sensor cable should be

placed on the back of the hand.

3 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.

8.4 Measurement Limitations

Certain patient conditions can affect the measurements and cause the loss of the pulse signal.

Inaccurate measurements can be caused but not limited by:

 incorrect sensor application

 high levels of ambient light sources, such as surgical lights (especially those with a xenon

light source), bilirubin lamps, fluorescent lights, infrared heating lamps, and direct sunlight

 failure to cover the sensor with opaque material in high levels of ambient light conditions

 dysfunctional hemoglobins

 low peripheral perfusion

 excessive or violent patient movement

 venous pulsations

 intravascular dyes, such as indocyanine green or methylene blue

 externally applied coloring agents (nail polish, dye, pigmented cream)

 defibrillation

 placement of the sensor on an extremity with a blood pressure cuff, arterial catheter, or

intravascular line

 electromagnetic interference

Loss of pulse signal can occur for the following reasons:

 the sensor is applied too tightly

 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

 low peripheral perfusion

NOTE:

1 To prevent interference from ambient light, ensure that the sensor is properly applied,

and cover the sensor site with opaque material.

2 Adjacent SpO

sensors may interfere with each other (eg, multiple SpO

measurements in the same patient). Be sure to cover the sensor with opaque

material to reduce cross-interference.

EDAN M3 User Manual

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