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Oxygen and Carbon Dioxide Concentrations in Anaesthetic Circuits Ventilated with an AGA UV 705 in an Oxygen Consuming Model Lung
Author(s) -
Sonander H.,
Stenqvist O.
Publication year - 1982
Publication title -
acta anaesthesiologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.738
H-Index - 107
eISSN - 1399-6576
pISSN - 0001-5172
DOI - 10.1111/j.1399-6576.1982.tb01731.x
Subject(s) - oxygen , carbon dioxide , fresh gas flow , medicine , anesthesia , artificial lung , lung , limiting oxygen concentration , ventilation (architecture) , nitrous oxide , inlet , chemistry , biology , ecology , sevoflurane , mechanical engineering , organic chemistry , engineering
An oxygen consuming and carbon dioxide producing model lung was used for evaluation of anaesthetic circle systems. Two different circles, the AGA metal circle and the AGA Monosorbcircle ventilated hy an AGA UV‐705 were tested with reference to inspired oxygen concentrations and end‐tidal CO 2 levels. Cartmn dioxide is dependent on alveolar ventilation and CO 2 production and thus was stable throughout the experiments. The oxygen concentration of inspired gas decreased progressively with decreasing fresh gas flow. When using the fresh gas inlet on the ventilator outlet block, the inspired oxygen concentration fell 8% as compared to using the fresh gas inlet in the circle. Fresh gas flows under 3 1/min should only be used with oxygen monitoring in the circle. The fresh gas inlet must be directly into the circle, and not in the ventilator outlet block, to avoid hypoxia.