Measuring Microstream CO
2
15 Monitoring Carbon Dioxide
189
Removing Exhaust Gases from the System
WARNING Anesthetics: When using the sidestream CO
2
measurement on patients who are receiving or have
recently received anesthetics, connect the outlet to a scavenging system, to avoid exposing medical staff
to anesthetics.
Use an exhaust tube to remove the sample gas to a scavenging system. Attach it to the sidestream sensor
at the outlet connector.
Measuring Microstream CO
2
The Microstream CO
2
method measures the partial pressure of carbon dioxide in a patient’s expired
gas using Microstream technology.
The measurement is equipped with an automatic barometric pressure compensation.
Preparing to Measure Microstream CO
2
Use appropriate accessories for:
• the patient type (adult, pediatric or neonatal),
• the ventilation situation (including humidification)
• the duration - short term use, up to 24 hours (typically OR), or long term use (typically ICU).
All accessories are for single patient use only.
Using Microstream Accessories
The Microstream measurement can be operated with the special Microstream accessories only. Refer to
the instructions for use provided with the accessory.
For intubated patient with non-humidified ventilation, you can use a Microstream FilterLine set. For
humidified ventilation, use a FilterLine H Set.
For non-intubated patients, the gas sample is taken through a Nasal FilterLine, or a Smart CapnoLine
(which is a combined oral-nasal FilterLine). In parallel to the measurement of the CO
2
, oxygen (O
2
)
may be delivered to the patient to support gas exchange. This is done by using an O
2
/CO
2
FilterLine,
or a Smart CapnoLine O
2
(a combined oral-nasal O
2
/CO
2
FilterLine).
Using the FilterLine and Airway Adapter
1 Attach the female Luer connector to the CO
2
inlet connector on the extension by pushing the
socket cover down and screwing the connector into place.
2 Check that the FilterLine is not kinked.
3 Change the FilterLine if a CO
2
OCCLUSION INOP appears on the monitor or if the readings
become extremely erratic.
Disconnect the FilterLine during suctioning and nebulizing therapies.
Check the table in the Microstream CO
2
Accessories section of the Accessories chapter for typical
usage times for the different Microstream accessories.