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use a disposable adhesive sensor that may tolerate more
motion.
• Replace the sensor.
PROBLEM: The SpO
2
value or the pulse rate changes
rapidly; the pulse amplitude bar is erratic.
CAUSE:
• Excessive patient motion may be making it impossible
for the SpO
2
function to find a pulse pattern.
• An electrosurgical unit (ESU) may be interfering with
performance.
SOLUTION:
Check the patient.
• If possible, keep the patient still; check whether the
sensor is applied securely and properly, and replace it if
necessary; move the sensor to a new site; use a sensor
that tolerates more motion.
If an ESU is interfering:
• Move the SpO
2
cable as far from the ESU as possible.
• Plug the Monitor and the ESU into different AC circuits.
• Move the ESU ground pad as close to the surgical site as
possible.
• The sensor may be damp or may need to be replaced
with a new sensor.
PROBLEM: The oxygen saturation measurement does not
correlate with the value calculated from a blood gas
determination.
CAUSE:
• The SpO2 calculation may not have correctly adjusted
for the effects of pH; temperature; CO2; fetal
hemoglobin; or 2,3-DPG.
• Accuracy can be affected by incorrect sensor application
or use; intravascular dyes; bright light; excessive patient
movement; venous pulsations; electrosurgical
interference; and placement of a sensor on an extremity
that has a blood pressure cuff, arterial catheter, or
intravascular line.
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