If an anesthesia machine was found to have run on only oxygen 5 L/min all weekend, what is the most reasonable course of action before the next induction?

If an anesthesia machine was found to have run on only oxygen 5 L/min all weekend, what is the most reasonable course of action before the next induction?

• A. Turn machine off for 30 minutes
• B. Place humidifier in line with the expiratory limb
• C. Avoid use of sevoflurane
• D. Change the CO2 absorbent

Answer: (D)

When a anesthesia machine sits running on oxygen for days, the CO2 absorber can dry out and lose its ability to scrub CO2 effectively. Desiccated absorbent not only diminishes CO2 removal, but if volatile anesthetics are used later, it can produce toxic carbon monoxide due to chemical reactions with the dry material. Replacing the CO2 absorbent restores proper CO2 removal and minimizes the risk of CO exposure when anesthesia is started again. Turning the machine off briefly won’t fix the desiccation or restore absorption capacity. Adding a humidifier in the expiratory limb doesn’t address the absorber’s condition and won’t prevent CO production. Avoiding sevoflurane is prudent if a dry absorber is present, but the definitive, safest step is to replace the CO2 absorbent so the circuit is ready for any agent used next.

When a anesthesia machine sits running on oxygen for days, the CO2 absorber can dry out and lose its ability to scrub CO2 effectively. Desiccated absorbent not only diminishes CO2 removal, but if volatile anesthetics are used later, it can produce toxic carbon monoxide due to chemical reactions with the dry material. Replacing the CO2 absorbent restores proper CO2 removal and minimizes the risk of CO exposure when anesthesia is started again.

Turning the machine off briefly won’t fix the desiccation or restore absorption capacity. Adding a humidifier in the expiratory limb doesn’t address the absorber’s condition and won’t prevent CO production. Avoiding sevoflurane is prudent if a dry absorber is present, but the definitive, safest step is to replace the CO2 absorbent so the circuit is ready for any agent used next.