A comparison between the bain and magill anaesthetic systems during spontaneous breathing
- 1 March 1978
- journal article
- research article
- Published by Springer Nature in Canadian Journal of Anesthesia/Journal canadien d'anesthésie
- Vol. 25 (2) , 122-124
- https://doi.org/10.1007/bf03005068
Abstract
The efficiency of the Bain system has been compared with that of the Magill system in ten conscious subjects breathing spontaneously. Air was supplied at fresh flow rates of 150 ml/kg and decreased stepwise at four-minute intervals until a flow of 50 ml/kg was attained. Expired minute volume and end-tidal carbon dioxide concentrations were measured. No rebreathing could be demonstrated with the Magill system at flow rates above approximately 70 ml/kg. In contrast, rebreathing was evident at all flow rates with the Bain system. It is concluded that acceptable carbon dioxide levels during spontaneous breathing with the Bain circuit can only be maintained by considerable active hyperventilation when using flow rates of 150 ml/kg and less. Les systèmes de Bain et de Magill ont été comparés chez dix sujets conscients en respiration spontanée. Les débits de gaz frais de 150 ml/ kg/minutes étaient diminués en palier aux quatre minutes, jusqu’à un niveau de 50 ml/kg. On mesurait le volume expiré-minute ainsi que la CO2 de fin ďexpiration. On n’a pu mettre en évidence de rebreathing avec le système de Magill lorsque les débits de gaz frais étaient au-dessus de 70 ml/kg/minute. Par contre, un rebreathing était évident à tousles débits administrés avec le système de Bain. Nous concluons qu’avec des débits de gaz frais inférieurs à 150 ml/kg avec un circuit de Bain, des taux acceptables de Pco2 ne peuvent être obtenus qu’au coût ďune hyperventilation active et considérable.This publication has 10 references indexed in Scilit:
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