4-6 Rad-57 Signal Extraction Pulse CO-Oximeter Operator’s Manual
4
operation
The Low SIQ indicator flashes when the SpO
2
measurement may be compromised. When
the Low SIQ indicator is flashing, proceed with caution and do the following:
■ Assess the patient.
■ Check the sensor and ensure proper sensor application. The sensor must be well
secured to the site for the Rad-57 to maintain accurate readings. Also, misalignment
of the sensor’s emitter and detector can result in smaller signals.
■ 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 has
not been interrupted. For example, as may occur while lifting or crossing their legs
during a diaper change.
After performing the above, if the “Low SIQ” indication occurs frequently or continuously,
obtaining an arterial blood specimen for CO-Oximetry analysis may be considered to verify
the oxygen saturation value.
LOW PERFUSION
Low Perfusion is indicated when the arterial pulsations are very low (weak perfusion). Low
Perfusion is shown when the PI LED indicator bar does not exceed 0.25 on the Rad-57c
and Rad-57m. Low Perfusion on the Rad-57cm is shown when the Low PI LED indicator
light is illuminated continuously or a PI value of < 0.25 is displayed.
CAUTION: IF LOW PERFUSION INDICATION IS FREQUENTLY DISPLAYED, FIND A
BETTER PERFUSED MONITORING SITE. IN THE INTERIM, ASSESS THE PATIENT
AND, IF INDICATED, VERIFY OXYGENATION STATUS THROUGH OTHER MEANS.
ACTIONS TO BE TAKEN
If the SpO
2
readings show significant differences, do the following:
■ Make sure the emitter and detector are aligned directly opposite each other.
■ Select a site where the distance between the emitter and detector is minimized.
■ Wipe the sensor site with a 70% isopropyl alcohol pad or rubefacient cream
(10-30% methyl salicylate and 2-10% menthol) and allow to dry for 20-30 seconds.
Strong vasodilator creams, such as nitroglycerin paste, are not recommended.
■ If possible, remove electrical noise sources such as electrosurgical units or other
electrical/electronic equipment.
■ If artificial nails or excessive fingernail polish are present, select another site or
remove the polish/artificial nails.
■ If possible, ensure that the sensor is placed in a location with low ambient light.
CAUTION: IF ANY MEASUREMENT SEEMS QUESTIONABLE, FIRST CHECK THE
PATIENT’S VITAL SIGNS BY ALTERNATE MEANS AND THEN CHECK THE PULSE
CO-OXIMETER FOR PROPER FUNCTIONING.
LOW SIGNAL IQ (LOW SIQ) (CONTINUED)
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