• Anaesthesia · May 1996

    Comparative Study

    The importance of the expiratory pause. Comparison of the Mapleson A, C and D breathing systems using a lung model.

    • L B Cook.
    • Department of Anaesthetics, Hammersmith Hospital, London.
    • Anaesthesia. 1996 May 1; 51 (5): 453-60.

    AbstractA physical lung model simulating spontaneous respiration was used to investigate the influence of the respiratory pattern on the efficiency of the Mapleson A, C and D breathing systems. It is shown that the Mapleson A system is always the most efficient breathing system and that its performance is relatively independent of the respiratory pattern. When the expiratory pause is minimal, the Mapleson C system is almost as efficient as the Mapleson A, but becomes ever less efficient as the expiratory pause increases. The Mapleson D system is very inefficient when the expiratory pause is short. With a longer expiratory pause, this system's efficiency approaches that of the Mapleson A. The experimental results are compared with predictions generated by a mathematical model. There is good agreement between the two, validating the mathematics used.

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