Abstract
ABSTRACTThe use of a Mapleson ‘E’ circuit for controlled ventilation is described and its function investigated. Twelve Labrador dogs were anaesthestised and ventilated using an ‘air piston’. Fresh gas flows to attain low, normal or high arterial levels of carbon dioxide were found to be independent of minute volume, providing a relatively large tidal volume is used to minimise the ratio of anatomical dead space to tidal volume (VDanat/Vt). At normocapnia economy of fresh gas usage is demonstrated.
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