Anaesthetic Gas Analysis

anaesthetic machine end tidal carbon dioxide gas analysis monitoring oxygen volatileagents Sep 14, 2024

How do you know how much oxygen the patient is really getting? ๐Ÿ’จ Or how much sevoflurane? ๐Ÿ’‰ How do you detect a circuit disconnection? โš ๏ธ Can you imagine how dangerous it would be if we didn’t have this information in real-time? ๐Ÿ•’

We take it for granted, but that tiny little tube connected to the airway filter does a great job at keeping your patients safe! ๐Ÿ›ก๏ธ This is called a side stream analyser. It has an internal diameter of 1.2mm, is made to resist kinking, and does not react with anaesthetic gases. ๐Ÿšซ It carries the gas sample at around 100ml/min to the machine where it is analysed and presented on the monitor. ๐Ÿ“Š

This is what it tells you:
๐Ÿ”บ Gases (inspired and expired) ๐ŸŒฌ๏ธ
๐Ÿ‘‰ Oxygen Concentration ๐Ÿ’š
๐Ÿ‘‰ Carbon Dioxide Concentration ๐ŸŒก๏ธ
๐Ÿ‘‰ Volatile Anaesthetic Agent Concentration ๐Ÿงช
๐Ÿ‘‰ Nitrous Oxide Concentration ๐Ÿ’จ
๐Ÿ”บ Machine problems โš™๏ธ
๐Ÿ‘‰ Detection of Circuit Leaks/Disconnection ๐Ÿšจ
๐Ÿ‘‰ Identification of Rebreathing ๐Ÿ”„
๐Ÿ‘‰ Mixed volatile detection ๐Ÿงฌ
๐Ÿ‘‰ Hypoxic Mixture Alerts ๐Ÿš‘

The modern anaesthetic machine uses a combination of gas analysis techniques to present real-time, essential information about your patient and your equipment. ๐Ÿ•ต๏ธ‍โ™‚๏ธ That tiny tube and its humble sampling chamber, along with a vigilant anaesthetic team, is just another reason why anaesthesia is so safe! ๐Ÿ›ก๏ธ

Build knowledge โœ…
Improve safety โœ…

Ref: J. A. Langton, A. Hutton, Respiratory gas analysis, Continuing Education in Anaesthesia Critical Care & Pain, Volume 9, Issue 1, February 2009, Pages 19–23, https://doi.org/10.1093/bjaceaccp/mkn048

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