Nellcor N-395 Operator's Manual page 69

Inaccurate measuremeiits can be caused by:
prolonged patient movement
e
venous pulsatioiis
intravascular dyes, such as indocyanine green or
metliylene blue
e
significant levels of dysfunctional hemoglobins
defibrillation
Ambient environmental conditions and sensor application
errors, which can affect pulse oximetry readings, are discussed
in the Sensors and Accessories section of this manual and in the
sensor directions for use.
The effects of electromagnetic interference on oximetry
readings are discussed in the Troubleshooting and Maintenance
section of this manual.