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Description of Controls, Indicators, and Symbols
12
• incorrect sensor application
– sensor placement on an extremity with a blood pressure cuff,
arterial catheter, or intravascular line
– sensor applied too tightly
– incorrect sensor for placement site
• intravascular dyes, such as indocyanine green or methylene blue
• externally applied coloring agents, such as nail polish, dye, or
pigmented cream
• failure to cover the sensor with opaque material in high ambient
light conditions, for example, conditions created from one or
more of the following sources:
– surgical lights, especially xenon light sources
– bilirubin lamps
– fluorescent lights
– infrared heating lamps
– direct sunlight
• physical movement, either patient or imposed activity
• venous pulsation
• dysfunctional hemoglobin
• low perfusion
• intermittent pulsatility or arrhythmia
• electromagnetic interference (EMI)
• ventilator-induced pressure changes
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