Performance Considerations
66 Operator’s Manual
Signal Loss
Loss-of-pulse signal can occur for several reasons.
• Pulse oximetry sensor applied too tightly
• Inflation of a blood pressure cuff on the same extremity as the attached pulse
oximetry sensor
• Arterial occlusion proximal to the pulse oximetry sensor
• Poor peripheral perfusion
Recommended Usage
Select an appropriate Nellcor™ pulse oximetry sensor, apply it as directed, and
observe all warnings and cautions presented in the Directions for Use accom-
panying the sensor. Clean and remove any substances such as nail polish from
the application site. Periodically check to ensure that the sensor remains prop-
erly positioned on the patient.
High ambient light sources such as surgical lights (especially those with a xenon
light source), bilirubin lamps, fluorescent lights, infrared heating lamps, and
direct sunlight can interfere with the performance of a Nellcor™ pulse oxime-
try sensor. To prevent interference from ambient light, ensure that the sensor
is properly applied, and cover the sensor site with opaque material.
If patient activity presents a problem, try one or more of the following remedies to
correct the problem.
• Verify the Nellcor™ pulse oximetry sensor is properly and securely applied.
• Move the sensor to a less active site.
• Use an adhesive sensor that improves patient skin contact.
• Use a new sensor with fresh adhesive backing.
• Keep the patient still, if possible.
If poor perfusion affects performance, consider using the Nellcor™ forehead
SpO
2 sensor (Max-Fast), which provides superior detection in the presence of
vasoconstriction. Nellcor™ forehead SpO
2 sensors work particularly well on
supine patients and mechanically ventilated patients. During low perfusion
conditions, Nellcor™ forehead SpO
2 sensors reflect changes to SpO2 values up
to 60 seconds earlier than digit sensors.
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