Installation and setup
Page C-16
Operator’s Manual PiCCO
2
Version 3.1
3.6
Central venous oxygen saturation
3.6.1
ScvO
2
calibration
Regular in vivo calibration is required using blood gas analysis of a central venous blood sample to ensure
accurate measurement of continuous ScvO
2
.
For optimal accuracy, it is recommended that an in vivo calibration be performed at least every 24 hours.
The Signal Quality Indicator (SQI) is used for assessing the quality of fiberoptical signals during probe
placement, calibration and measurement.
Signal Quality Indicator (SQI):
In the ScvO
2
calibration screen as well as in the parameter field the PiCCO
2
provides a Signal Quality
Indicator to assist in proper probe placement.
The signal quality is indicated by bars of different height levels. Generally, the higher the level the better the
signal.
Signal quality may be compromised by the following:
x
Strong pulsation / motion artifacts
x
Signal intensity (e.g. kinking of probe, blood clot or haemodilution)
x
Intermittent wall contact by the tip of the probe
NOTE
The SQI signal can be affected by the presence of electrosurgical units. Attempt to distance
electrocautery equipment and cables from the monitor and plug the power cords into separate
circuits if possible. If signal quality problems persist, contact PULSION Medical Systems for
assistance.
To achieve optimal accuracy, it is recommended that the entered haemoglobin and haematocrit
values be updated when there is a change of 6 % or more in haematocrit or of 1.8 g/dl (1.1
mmol/l) or more in haemoglobin. A change in haemoglobin may also affect SQI.
Dye (e.g. Indocyanine Green) or other substances which contain dyes which usually modify the
light absorption capacities, can lead to faulty measurement values of the oxygen saturation.
In case of ICG measurement ScvO
2
calibration is not possible for a maximum time span of 90
minutes.
