| Manifestations | |
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- Low anesthetic agent concentration (if air entrainment into breathing system)
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| Potential causes | |
- Patient O2 consumption and gas sampling exceeds O2 flow rate
|
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- Gas piping system crossover
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- O2 pipeline hose misconnection
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- Gas blender between O2 pipeline and anesthesia machine
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- Gas piping crossover within anesthesia machine
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| |
- Air entrainment into the breathing system
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- Circuit disconnection with spontaneous breathing
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- Circuit disconnection with hanging-bellows ventilator
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- Circuit disconnection with piston ventilator
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| Suggested responses | - Increase O2 flow rate and decrease flow rate of other gases
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- Consider wrong gas malfunction if inspired O2 concentration does not increase
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- Open backup O2 cylinder AND disconnect O2 pipeline hose if pipeline crossover suspected
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- Do not use auxiliary O2 flowmeter on the anesthesia workstation - it has the same O2 source as main O2 flowmeter
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- Ventilate with manual resuscitation bag connected to a different O2 cylinder
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