Abstract
The resistance to gas flow is measured in the Jackson-Rees modification of the Ayre’s T-piece, the “Bain” circuit, and the circle circuit using the conventionally employed rubber tubing, or either of two coaxial circle tubing systems. The Ayre’s T-piece has the lowest resistance to gas flow, followed by the circle circuit with conventional rubber tubing, then the “Bain” circuit and the coaxial circle circuits. When the resistance to gas flow in the inspiratory limb is measured with a tracheal tube attached to each circuit the resistances increase in magnitude, but the differences among the circuits become less significant.
Résumé
On a mesuré la résistance à l’écoulement gazeux dans le tube en T d’Ayre, le circuit de “Bain”, le circuit circulaire avec tube conventionnel en caoutchouc et le même circuit avec des tubulures coaxiales. Le tube d’Ayre est celui qui offre la plus faible résistance à l’écoulement des gaz, suivi par le circuit circulaire avec tubulure conventionnelle en caoutchouc, du circuit de “Bain” et des circuits circulaires utilisant des tubulures coaxiales. Lorsque la résistance à l’écoulement gazeux du côté inspiratoire est mesurée avec un tube trachéal en place l’importance des résistances augmente mais les différences entre les circuits deviennent moins significatives.
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Shandro, J. Resistance to gas flow in the “new” anaesthesia circuits: A comparative study. Can. Anaesth. Soc. J. 29, 387–390 (1982). https://doi.org/10.1007/BF03007532
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DOI: https://doi.org/10.1007/BF03007532