An evaluation of gas density dependence of anaesthetic vaporizers.
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% and decreased the outputs of the enflurane Ohio unit up to 20%.
D000769:Anesthesia, Inhalation / Q000295:instrumentation*; D002245:Carbon Dioxide / Q000032:analysis; D004737:Enflurane / Q000032:analysis; D005740:Gases / Q000032:analysis*; D006221:Halothane / Q000032:analysis; D006371:Helium / Q000032:analysis; D006931:Hyperbaric Oxygenation; D009609:Nitrous Oxide / Q000032:analysis; D010100:Oxygen / Q000032:analysis; D014835:Volatilization
D005740:Gases; D002245:Carbon Dioxide; D006371:Helium; D004737:Enflurane; D009609:Nitrous Oxide; D010100:Oxygen; D006221:Halothane