Terumo CDI 550, Operator'S Manual

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troubleshooting chapter 9 9-15
Laboratory comparison troubleshooting table
The following table details information you can use to determine why your CDI
System 550 values appear to be inaccurate with respect to laboratory values:
Issue Meaning and/or Corrective Action
Make sure the circuit
has stabilized before
drawing a laboratory
comparison sample.
„ Wait approximately five minutes after making a change
to blood flow rate, gas flow rate, FiO
2
, temperature,
etc. Watching the CDI System 550 parameter values
for a minute or so will give you a good idea of whether
the circuit has stabilized or not (the graphics display is
also helpful for checking blood parameter stability).
„ Check to see if the values measured 1-2 minutes after
storing have moved closer towards the corresponding
lab values. If so, this is a good indication that dynamic
blood parameter changes and the system’s time
response are responsible for the comparison differ-
ence. Performing an in vivo recalibration under these
conditions is not recommended.
„
A blood flow rate of less than 35 ml/min in the CDI
Shunt Sensor line may result in slower measurement
response times. Restoration of the flow rate back
above 35 ml/min will return the sensor readings to
normal.
„
A minimum blood flow rate through the CDI H/S Cu-
vette may result in less than optimal saturation/ hema-
tocrit readings. Restoration of the flow rate back above
minimum requirement will return the CDI H/S Cuvette
readings to normal. See the table below for reference:
H/S Cuvette Size Min Flow Max Flow
1/2" 1.0 LPM 7.0 LPM
3/8" 0.5 LPM 4.0 LPM
1/4" 0.2 LPM 1.5 LPM
„
Air bubbles or fluid other than blood (such as medica-
tion given in the shunt line, passing the shunt sensor)
will affect the shunt sensor readings intermittently. As
soon as the air or fluid clears the shunt sensor, values
will return to normal.