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Related Experiment Videos

The 600 gram CO2 absorption canister: an experimental study

B Jorgensen, S Jorgensen

    Acta Anaesthesiologica Scandinavica
    |January 1, 1977
    PubMed
    Summary

    Sodasorb indicator soda lime effectively eliminates carbon dioxide for at least 4 hours in anesthesia circuits. Replace the canister when 2/3 of the lime shows a color shift, indicating reduced CO2 absorption efficiency.

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    Area of Science:

    • Anesthesiology
    • Chemical Engineering
    • Respiratory Therapy

    Background:

    • The Hafnia circle system utilizes soda lime for carbon dioxide absorption during anesthesia.
    • Efficient carbon dioxide elimination is critical for patient safety and preventing hypercapnia.

    Purpose of the Study:

    • To investigate the efficacy and duration of carbon dioxide elimination by Sodasorb indicator soda lime in a model anesthesia circuit.
    • To determine optimal replacement criteria for the soda lime canister based on visual indicators.

    Main Methods:

    • Model investigations using a canister with 600 g Sodasorb indicator soda lime.
    • Controlled carbon dioxide input (300 ml/min) and varying fresh gas flow rates.
    • Monitoring temperature and visual color change of the soda lime to assess CO2 absorption efficiency.

    Main Results:

    • Effective carbon dioxide elimination was maintained for at least 4 hours, independent of fresh gas flow rate.
    • A direct proportionality was observed between fresh gas inflow and the duration of effective CO2 elimination.
    • A color shift progression to 2/3 of the lime charge reliably indicated the need for canister replacement.

    Conclusions:

    • Sodasorb indicator soda lime provides sustained carbon dioxide absorption in anesthesia circuits.
    • Canister replacement should be based on the 2/3 color shift threshold for optimal performance.
    • Regular cleaning of circle system components is essential after each anesthetic procedure.

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