16 Monitoring Intravascular Oxygen Saturation
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The probe/catheter should be replaced after it has been in place for 72 hours.
CAUTION
Do not apply excessive tension to any sensor cable or part of the catheter.
Performing In-Vivo Calibration
Perform an in-vivo calibration:
• when you place the catheter in a patient.
• if the catheter was disconnected from the optical module.
• when the catheter has been in the patient for 24 hours.
• if any significant change in light intensity occurs that the monitor cannot correct automatically.
Further Information for Both Modules
Checking Suspicious Values
If you have any doubts about the correctness of the measurement value, take a blood sample and have
it analyzed using standard laboratory procedures.
Calculating Oxygen Extraction
Oxygen extraction is the difference between the measured SpO
2
and SvO
2
values. If you are
monitoring SpO
2
and SvO
2
, the monitor can calculate this value and display it as a numeric.
• To switch oxygen extraction calculation on or off, in the
Setup Sp-vO₂ menu, select Sp-vO₂ and
toggle between
On and Off.
•If more than one SpO
2
value is available, you must choose which value is used in the calculation.
In the
Setup Sp-vO₂ menu, select SpO₂ Source and select the required source.
If one of the calculation sources becomes unavailable, the monitor displays the INOP
Sp-vO₂ CHK
SOURCES for one minute. After this time, the calculation automatically switches off. If the missing
source becomes available again, the calculation automatically switches on again.
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