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14 Monitoring Carbon Dioxide Using the Capnography Extension (M3014A)
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WARNING Correlation: The etCO
2
readings do not always correlate closely with paCO
2
, especially in neonatal
patients and patients with pulmonary disease, pulmonary embolism or inappropriate ventilation.
Pharmaceuticals in aerosols: Do not measure CO
2
in the presence of pharmaceuticals in aerosols.
Explosion Hazard: Do not use in the presence of flammable anesthetics, such as a flammable
anesthetic mixture with air, oxygen or nitrous oxide.Use of the devices in such an environment may
present an explosion hazard.
Failure of operation: if the measurement extension or a sensor fails to respond as described, do not use
it until the situation has been corrected by qualified personnel.
Low etCO
2
values: Leakages in the breathing system or sampling system may cause the displayed
etCO
2
values to be significantly too low. Always connect all components securely and check for leaks
according to standard clinical procedures. Displacement of the nasal or combined nasal oral cannulas
can cause lower than actual etCO
2
readings. Even with combined nasal oral cannulas, the etCO
2
readings may be slightly lower than actual in patients breathing through the mouth only.
Using the Capnography Extension (M3014A)
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 nonintubated adult, pediatric and infant 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 1000m difference.
Electrical Shock Hazard: Do not open the measurement extension. Contact with exposed electrical
components may cause electrical shock. Always turn off and remove power before cleaning the sensor
or measurement server. Do not use a damaged sensor or one with exposed electrical contacts. Refer
servicing to qualified service personnel.
CAUTION Use the M3014A measurement extension with Philips approved accessories only. Refer to the
instructions for use provided with the accessory.
Preparing to Measure Mainstream CO
2
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 measurement extension.
2 Wait 2 minutes, allowing the sensor to reach its operating temperature and a stable thermal
condition.