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? 💨 Or how much sevoflurane? 💉 How do you detect a circuit disconnection? ⚠️ Can you imagine how dangerous it would be if we didn’t have this information in real-time? 🕒

We take it for granted, but that tiny little tube connected to the airway filter does a great job at keeping your patients safe! 🛡️ 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. 🚫 It carries the gas sample at around 100ml/min to the machine where it is analysed and presented on the monitor. 📊

This is what it tells you:
🔺 Gases (inspired and expired) 🌬️
👉 Oxygen Concentration 💚
👉 Carbon Dioxide Concentration 🌡️
👉 Volatile Anaesthetic Agent Concentration 🧪
👉 Nitrous Oxide Concentration 💨
🔺 Machine problems ⚙️
👉 Detection of Circuit Leaks/Disconnection 🚨
👉 Identification of Rebreathing 🔄
👉 Mixed volatile detection 🧬
👉 Hypoxic Mixture Alerts 🚑

The modern anaesthetic machine uses a combination of gas analysis techniques to present real-time, essential information about your patient and your equipment. 🕵️‍♂️ That tiny tube and its humble sampling chamber, along with a vigilant anaesthetic team, is just another reason why anaesthesia is so safe! 🛡️

Build knowledge ✅
Improve safety ✅

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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