The ADU vaporizing unit: A new vaporizer

Jan F.A. Hendrickx, Sofie De Cooman, Thierry Deloof, Dirk Vandeput, José Coddens, Andre M. De Wolf*

*Corresponding author for this work

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

We determined the performance of the vaporizer of the ADU machine (Anesthesia Delivery Unit; Datex-Ohmeda, Helsinki, Finland). The effects of carrier gas composition (oxygen, oxygen/N2O mixture, and air) and fresh gas flow (0.2 to 10 L/min) on vaporizer performance were examined with variable concentrations of isoflurane, sevoflurane, and desflurane across the whole range of each vaporizer's output. In addition, the effects of sudden changes in fresh gas flow and carrier gas composition, back pressure, flushing, and tipping were assessed. Vaporizer output depended on fresh gas flow, carrier gas composition, dial settings, and the drug used. Vaporizer output remained within 10% of dial setting with fresh gas flows of 0.3-10 L/min for isoflurane, within 10% of dial setting with fresh gas flows of 0.5-5 L/min for sevoflurane, and within 13% of dial setting with fresh gas flows of 0.5 to 1 L/min for desflurane. Outside these fresh gas flow ranges, output deviated more. The effect of sudden changes in fresh gas flow or carrier gas composition, back pressure, flushing, and tipping was minimal. We conclude that the ADU vaporizer performs well under most clinical conditions. Despite a different design and the use of complex algorithms to improve accuracy, the same physical factors affecting the performance of conventional vaporizers also affect the ADU vaporizer.

Original languageEnglish (US)
Pages (from-to)391-395
Number of pages5
JournalAnesthesia and analgesia
Volume93
Issue number2
DOIs
StatePublished - Jan 1 2001

ASJC Scopus subject areas

  • Anesthesiology and Pain Medicine

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    Hendrickx, J. F. A., De Cooman, S., Deloof, T., Vandeput, D., Coddens, J., & De Wolf, A. M. (2001). The ADU vaporizing unit: A new vaporizer. Anesthesia and analgesia, 93(2), 391-395. https://doi.org/10.1213/00000539-200108000-00031