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Canadian Journal of Anesthesia, Vol 27, 106-110, Copyright © 1980 by Canadian Anesthesiologists' Society

An Evaluation of Gas Density Dependence of Anaesthetic Vaporizers

L. PRINS 1, J. STRUPAT 1, J. CLEMENT 1, and R. L. KNILL 1

1 Departments of Anaesthesia and Respiratory Technology, University Hospital, University of Western Ontario, London, Ontario

Four commonly used vaporizers were studied for the effect of carrier gas density on vaporizer output. Vapour concentrations from a halothane Cyprane (Fluotec) Mark 2 increased in relation to the density of carrier gas, whereas the concentrations delivered by an enflurane Ohio vaporizer decreased. The halothane Cyprane (Fluotec) Mark 3 and enflurane Cyprane vaporizers were largely independent of density. Of clinical importance, nitrous oxide/oxygen (75/25), compared with oxygen alone, increased the vapour concentration outputs of the halothane Mark 2 up to 30 per cent and decreased the outputs of the enflurane Ohio unit up to 20 per cent.






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Copyright © 1980 by the Canadian Anesthesiologists' Society.