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Controlled ventilation with the Mapleson D system A theoretical and experimental study

H F Seeley, P K Barnes, C M Conway

    British Journal of Anaesthesia
    |February 1, 1977
    PubMed
    Summary
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    This study models the Mapleson D system, revealing relationships between carbon dioxide levels, ventilation, and gas flow. A nomogram predicts alveolar carbon dioxide concentrations for controlled ventilation.

    Area of Science:

    • Anesthesiology
    • Respiratory Physiology
    • Medical Engineering

    Background:

    • The Mapleson D system is commonly used for controlled ventilation.
    • Understanding the factors influencing alveolar carbon dioxide concentration is crucial for patient safety during anesthesia.

    Purpose of the Study:

    • To theoretically analyze the relationships between alveolar carbon dioxide concentration, carbon dioxide output, alveolar ventilation, and fresh gas flow during controlled ventilation with the Mapleson D system.
    • To develop a predictive tool for alveolar carbon dioxide concentrations in humans ventilated with this system.

    Main Methods:

    • A theoretical model was developed to describe the interrelationships.
    • The model's equations were validated through experiments using dogs ventilated with a coaxial Mapleson D system.

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  • Experimental data at varying fresh gas flow and alveolar ventilation levels were used for substantiation.

    • Main Results:

    • The study established clear interrelationships between key respiratory parameters under Mapleson D ventilation.
    • Experimental validation confirmed the accuracy of the theoretical model and equations.
    • A nomogram was successfully generated to predict alveolar carbon dioxide concentrations.

    Conclusions:

    • The developed model accurately represents the behavior of the Mapleson D system.
    • The nomogram provides a practical tool for anesthesiologists to predict and manage alveolar carbon dioxide levels.
    • This research aids in optimizing controlled ventilation strategies using the Mapleson D system.