troubleshootingchapter 99-12
Message/Problem Meaning and Corrective Action
Inaccurate values
when compared to a
laboratory.
Verify that a successful sensor calibration has been
done. For added assurance, verify the calibration us-
ing the system’s calibration verication function.
Note: Verication can only be done after calibration but
before operation.
Verify that proper blood sampling and lab procedures
are followed.
Make sure there is a minimum ow rate of
35 ml/min through the shunt sensor.
Make sure the circuit has stabilized before drawing a
comparison blood sample. Periods of dynamic move-
ment of temperature and / or blood parameters make
single-point (in time) comparisons difficult.
After changes of blood temperature of > 6°C, repeat
an in vivo calibration of shunt sensor values once tem-
perature stability has been achieved. Optimal system
accuracy will be maintained with this practice.
Check the shunt line. If it’s too long, the blood in the
line may have started equilibrating to room air values.
Make sure the laboratory and the monitor are correct-
ing the blood gases to the same temperature, or both
are using 37°C.
Make sure the sensor has not been exposed to ac-
etate containing primes at low pH (<7.0) for more than
a few minutes. This would produce elevated PCO2
levels.
Make sure the sensor has not been exposed to uids
at high pH (> 7.8). This may affect K
+
accuracy.
Check to make sure the “calculations” section of Setup
has the appropriate settings for your application. See
the following troubleshooting section: “Laboratory com-
parison troubleshooting chart.”
Check for substances with known potential to cause
inaccuracy, these include: Indocyanine green (Cardio-
green), Methylene Blue, or other intravascular dyes,
carboxyhemoglobin and other dyshemoglobins, hemo-
globinopathies, elevated bilirubinemia and/or icterus
(jaundice).
Check for any novel pharmacological agents that have
potential effect on CDI sensors.
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