Safety Information
3
Measurements
Loss of pulse signal can occur for the following reasons:
¥ The sensor is too tight.
¥ There is excessive illumination, such as from
sunlight or a surgical or bilirubin lamp.
¥ The sensor is placed on an extremity with a blood
pressure cuff, arterial catheter, or intravascular line.
¥ The patient is in shock, has hypotension, severe
vasoconstriction or anemia, hypothermia, arterial
occlusion proximal to the sensor, or cardiac arrest.
Inaccurate measurements may be caused by:
¥ Incorrect application or use of a sensor.
¥ Significant levels of dysfunctional hemoglobins, such
as carboxyhemoglobin or methemoglobin.
¥ Significant levels of indocyanine green, methylene
blue, or other intravascular dyes.
¥ Exposure to excessive illumination, such as surgical
lamps (especially ones with a xenon light source),
bilirubin lamps, fluorescent lights, infrared heating
lamps, or direct sunlight. Exposure to excessive
illumination can be corrected by covering the sensor
with a dark or opaque material.
¥ Excessive patient movement.
¥ Venous pulsations.
¥ High-frequency electrosurgical interference and
defibrillators.
¥ Placement of the sensor on an extremity that has a
blood pressure cuff, arterial catheter, or
intravascular line.
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