European journal of anaesthesiology
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A new way of saving anaesthetic vapours is described. The method is analogous to the heat-moisture exchanger principle: the vapour is trapped in a filter during expiration and is returned to the patient during the subsequent inspiration. ⋯ In model lung tests, this reduced the isoflurane consumption by 51% at a tidal volume of 300 ml, by 57% at 600 ml and by 51% at 930 ml. Neither isoflurane nor halothane yielded any degradation products when brought in contact with the zeolite.