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Isoflurane concentrations using uncompensated vaporisers within circle systems.

S Brosnan·B Royston·D White
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Abstract

In a series of studies designed to investigate the need for a temperature-compensated vaporiser for use in a circle system, we first studied temperature changes within and isoflurane concentration delivered by a Komesaroff vaporiser during bench tests using different gas flows. Agent temperature and vapour concentration decreased as predicted by the Antoine equation. Using the vaporiser within a circle system during clinical anaesthesia, we then studied 20 patients breathing spontaneously and a further 10 patients receiving controlled ventilation, measuring the temperature of the agent within the vaporiser and the concentration of agent inspired by a the patient. In clincial use with the frest gas flows of 1-3.min-1, the inspired agent concentration did not decrease despite the decrease in temperature of the liquid isoflurane in the vaporiser.

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Anesthesia, Closed-CircuitAnesthetics, InhalationDrug Administration ScheduleHumansIntermittent Positive-Pressure VentilationIsofluraneNebulizers and VaporizersOrthopedic ProceduresTemperatureJournal Article

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BibTeXRIS

S Brosnan, B Royston, D White. 1998. Isoflurane concentrations using uncompensated vaporisers within circle systems.. https://doi.org/10.1046/j.1365-2044.1998.00366.x

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