Author(s): Thomasson R, Luttropp HH, Werner O
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Abstract 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. Fresh vapour is supplied on the patient side of the filter. A small container with 60 ml of a hydrophobic zeolite (an inorganic material) was used as filter. 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.
This article was published in Eur J Anaesthesiol
and referenced in Journal of Anesthesia & Clinical Research