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Airway gases
To prevent hypoxemia and to ensure safe and sufficient oxygen supply, the alveolar
oxygen concentration (EtO
2
) should be at the level of 25% minimum.
Nitrogen elimination
During the maintenance of minimal low flow anesthesia, a small amount of nitrogen
may accumulate in the circuit. It may be detected as decreased concentration of
other gases, and eliminated by temporarily increasing the fresh gas flow.
Flow reduction
Reduction of fresh gas flow may increase rebreathing in case of a CO
2
absorber
malfunction or during the use of open anesthesia gas delivery systems.
The lower the fresh gas flow, the higher the oxygen concentration required in the
fresh gas.
Level of anesthesia: E-sCAiO, E-sCAiOV, E-CAiO, E-CAiOV,
E-CAiOVX
Anesthetic agent uptake
Fresh gas flow reduction decreases the total amount of anesthetic agent fed into the
breathing system if agent concentration is maintained constant.
The lower the fresh gas flow rate, the longer the time required to reach the effect of a
change in the fresh gas settings.
Airway gases troubleshooting
Problem Solution
Airway gas values are too low
●
Check the sampling line and connectors for
leakage.
●
Check the patient status.
Airway gas values are too high
●
Check the sampling line for blockage.
●
Check the patient status.
Module does not work
●
Check and clean the filter if necessary.
●
Check the water trap container. If it is too full,
liquid may have entered the module. Replace the
module and have it checked by authorized service
personnel.
No airway gas values
●
Check that the gas sampling line is connected to
the water trap.
●
Check that the gas sampling line is connected to
the patient.
Why can we see dips in the capnogram during
expiration?
●
The dips seen in the capnogram during expiration
are related to the sidestream gas sampling, the
continuous gas flow to the Y-piece, and patient’s
cardiac contractions, which cause intra-thoracic
pressure changes and therefore flow variations.
2062971-001 CARESCAPE Modular Monitors 305