14 Monitoring Carbon Dioxide
205
Measuring CO2 using the CO2 Option or M3014A
The monitor (with the CO
2
option) or the M3014A Capnography Extension measures partial pressure
of carbon dioxide in a patient's expired gas using the mainstream method or the sidestream method.
The mainstream CO
2
measurement can be used, with appropriate accessories, with intubated adult,
pediatric and neonatal patients. The sidestream CO
2
measurement can be used, with appropriate
accessories, with intubated and non-intubated adult, pediatric, infant and neonatal patients. With
intubated patients, a sample of the respiratory gas is drawn from the patient's breathing circuit through
an airway adapter and a gas sampling tube. With non-intubated patients, the gas sample is drawn
through a nasal or oral-nasal cannula.
WARNING
Altitude Setting: The monitor is not equipped with automatic barometric pressure compensation.
Before the CO
2
measurement is used for the first time, the altitude must be set to the correct value. An
incorrect altitude setting will result in incorrect CO
2
readings. The CO
2
readings will typically deviate
5% for every 1000 m difference.
CAUTION
Use the CO
2
measurement with Philips approved accessories only. Refer to the instructions for use
provided with the accessory.
Preparing to Measure Mainstream CO2
You must perform a zero as described in this procedure each time you use a new airway
adapter.
1 Attach the sensor connector to the CO
2
connector on the monitor (when the optional CO
2
measurement is integrated) or on the extension.
2 Wait 2 minutes, allowing the sensor to reach its operating temperature and a stable thermal
condition.
3 Choose the appropriate airway adapter and connect it to the sensor head. The airway adapter clicks
into place when seated correctly.
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