Patient Monitor User Manual Monitoring CO
2
- 140 -
WARNING
1 No routine user calibration is required.
2 Accuracy is affected by temperature and barometric pressure.
NOTE:
1 If the catheter falls off during the measurement, it is necessary to re-zero after the
catheter is well connected, and then measurement can be performed.
2 Replace the airway adapter, if excessive moisture or secretions are observed in the
tubing or if the CO
2
waveform changes unexpectedly without a change in patient
status.
3 To avoid cross infection, use only disinfected or disposable airway adapters.
4 Inspect the airway adapters prior to use. Do not use it if airway adapter appears
damaged or broken. Observe airway adapter color coding for patient population.
5 Periodically check the flow sensor and tubing for excessive moisture or secretion
buildup.
6 Always connect the airway adapter to the sensor before inserting the airway adapter
into the breathing circuit. In reverse, always remove the airway adapter from the
breathing circuit before removing the sensor.
7 To avoid dead space, place the sensor as close to the patient as possible.
15.4 Setting CO
2
Corrections
Temperature, water vapor in the patient’s breath, barometric pressure, and the proportions of O
2
,
N
2
O and Helium in the mixture all influence CO
2
absorption. If values seem inaccurately high or
low, check that the monitor is using the appropriate corrections.
For the EDAN sidestream module, the following items are available in the CO
2
Other Setup
menu: N
2
O Compen., O
2
Compens., Anest. Agent, Vapor Compen. and Pump Rate. The
concentration of compensated gas should be set based on the current gas concentration which is
supplied for patient. As for O
2
and N
2
O, Make the supplied gas concentration multiply to its
volume to get the concentration. For instance, supply 100% O
2
, and its volume is 60%, then O
2
compensation is: 100%*60% = 60%. AG concentration is decided by anaesthesia apparatus.
For the Respironics CO
2
modules, there are Baro Press, O
2
Compens, Anes Agent and Balance
Gas in the CO
2
Other Setup menu. The concentration of compensated gas (including O
2
and AG)
should be set based on the current gas concentration which is supplied for patient. The selection
of balance gas depends on actual situation. For instance, N
2
O should be selected as balance gas if
the real balance gas is N
2
O.
After settings, the interface will display a dialog box: Confirm to change the settings? And the
detailed settings are displayed under the warning. Click Yes to confirm, and click No to cancel
the settings.
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