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Efficient positive pressure ventilation with a modified Magill circuit in adults

A preliminary study

Conclusion

By modifying a Magill circuit so that the relief valve can be closed during inflation and can open during exhalation after the reservoir bag has refilled, the circuit can be used efficiently with controlled ventilation. Preliminary studies indicate predictable physiological arterial carbon dioxide levels with fresh gas flows below those normally needed with a non-rebreathing circuit.

Résumé

Nous avons modifié un circuit de Magill de facon simple, afin de permettre une ventilation avec fermeture de la valve expiratoire durant l’application de pression positive et ouverture de cette valve aprés le remplissage du sac réservoir.

Des opérés furent ventilés manuellement avec ce systéme et avec un débit de gaz frais de 75 pour cent du volume minute prédit (volume non corrigé pour l’intubation). Les PCO2 se sont maintenues entre 36 et 42 torr. A l’usage ce système s’est avéré supéieur à la ventilation avec un circuit sans réinspiration, lequel est lui même supérieur à un circuit de Magill non modifié. Avec un apport constant de gaz frais, le circuit modifié maintenait des niveaux de CO2 constants, même en présence d’hyperventilation vigoureuse.

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Author information

Correspondence to Edward Carden.

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Carden, E. Efficient positive pressure ventilation with a modified Magill circuit in adults. Canad. Anaesth. Soc. J. 21, 242–250 (1974). https://doi.org/10.1007/BF03013117

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Keywords

  • CANADIAN Anaesthetist
  • Positive Pressure Ventilation
  • Arterial Blood Sample
  • Relief Valve
  • Frais