Philips MP20/30 사용자 설명서

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16 Monitoring tcGas
Finishing tcGas Monitoring
202
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.