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16 Monitoring tcGas Finishing tcGas Monitoring
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Selecting the tcGas HeatPowerDisplay Mode
The heat power display gives an indication of the skin’s perfusion below the transducer and of the
transducer’s contact with the skin. If the transducer loses contact, the heat power value drops
significantly. When perfusion is poor you need less heat power to maintain the transducer temperature.
♦ In the Setup tcGas menu, select HeatPowerDisplay to toggle between Relative and
Absolute. Choose Relative when the skin temperature is stable (the STABILIZING INOP
disappears). This indicates subsequent changes in the relative heat power (and therefore changes in
perfusion or transducer contact) since the last zeroing.
Zeroing the tcGas Relative Heat Power
When you start a calibration, the HeatPowerDisplay is set to Absolute. When you switch to
Relative, it automatically zeros. Zero again if you change application site.
Finishing tcGas Monitoring
♦ Replace the transducer in the calibration chamber.
When changing the application site after a measuring period, some users leave the fixation rings in
position to allow them to quickly move the transducer from site to site. Always unscrew the transducer
from the fixation ring before removing the fixation ring from the skin.
TcGas Corrections
Transcutaneous pCO
2
values tend to be higher than arterial values due to the metabolic processes of
the skin and the effect of heating on the blood under the transducer. Depending on your monitor’s
configuration, one or both of these corrections may automatically apply.
Temperature Correction for tcpCO
2
The transducer temperature causes an increase in partial CO
2
pressure. Your monitor may be
configured to correct this.
♦ In the Setup tcpGas menu, look at the menu item CO2 Correction. If correction is enabled,
it is set to
On.
Metabolism Correction for tcpCO
2
CO
2
production in the epidermis increases the CO
2
value. Your monitor may be configured to
automatically deduct a metabolism factor (only applies when
CO2 Correction is on).
♦ In the Setup tcGas menu, look at the value shown for the menu item MetabolismFactor.
This is deducted from the CO
2
value.