Operator's Manual

Radical-7 Chapter 7: Troubleshooting
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• Check the sensor and ensure proper sensor application. The
sensor must be well secured to the site for the Radical-7® Pulse
CO-Oximeter® to maintain accurate readings. Misalignment of
the sensor’s emitter and detector can result in smaller signals
and cause erroneous readings.
• Determine if an extreme change in the patient’s physiology and
blood flow at the monitoring site occurred, (e.g. an inflated
blood pressure cuff, a squeezing motion, sampling of an arterial
blood specimen from the hand containing the pulse oximetry
sensor, severe hypotension, peripheral vasoconstriction in
response to hypothermia, medications, or an episode of
Raynaud’s syndrome.)
• With neonates or infants, check that the peripheral blood flow to
the sensor site is not interrupted. Interruption, for example, may
occur while lifting or crossing their legs during a diaper change.
• After performing the above, if the parameter remains dimly lit
frequently or continuously, obtaining an arterial blood specimen
for CO-Oximetry analysis may be considered to verify the oxygen
saturation value.
See
Safety Warnings and Cautions on page 15.
Dimly Lit Parameters
When the signal quality is very low, the accuracy of measurements may
be compromised, the parameter may be dimly lit, and the parameter may
display dashes instead of a numeric value.