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Research ArticleOriginal Contributions

Characteristics of Demand Oxygen Delivery Systems: Maximum Output and Setting Recommendations

Peter L Bliss, Robert W McCoy and Alexander B Adams
Respiratory Care February 2004, 49 (2) 160-165;
Peter L Bliss
Valley Inspired Products LLC, Apple Valley, Minnesota.
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  • For correspondence: [email protected]
Robert W McCoy
Valley Inspired Products LLC, Apple Valley, Minnesota.
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Alexander B Adams
Department of Pulmonary/Critical Care Medicine, Regions Hospital, St Paul, Minnesota.
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Abstract

BACKGROUND: Demand oxygen delivery systems (DODS) allot oxygen by interrupting the oxygen flow during exhalation, when it would mostly be wasted. Because DODS conserve oxygen by various methods, there are important performance differences between DODS. We studied certain performance factors that have not previously been carefully examined.

METHODS: A bench model was constructed to simulate a nose, airway, and alveolar chamber. A breathing simulator generated 4 respiratory patterns, at frequencies of 15, 20, 25, and 30 breaths/min. Eighteen models of DODS were tested at 4 settings, each up to the maximum output, and compared to continuous-flow oxygen. The variable of interest was the fraction of inspired oxygen (FIO2) in the alveolar chamber, which was measured for each condition.

RESULTS: The DODS differed from continuous-flow oxygen, delivering 0.5–2.1 times (mean = 1.13 times) the FIO2 increase at similar settings. During maximum output the DODS showed a wide range of FIO2, from 0.27 to 0.46. There was a direct relationship between volume output per pulse in the first 0.6 s of inhalation and the delivered FIO2.

CONCLUSIONS: DODS settings were not equivalent to continuous-flow oxygen in a bench model assessment; with equivalent settings the DODS tended to deliver greater FIO2 than did continuous-flow oxygen. The maximum output capacity differed markedly among the DODS, and the user should know the device's capacity. A volume-referenced setting system for DODS should be adopted that would allow more predictable oxygen prescription and delivery via DODS.

  • oxygen
  • demand

Footnotes

  • Correspondence: Peter L Bliss BME. E-mail: pbliss{at}tflow.net.
  • Copyright © 2004 by Daedalus Enterprises Inc.
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Respiratory Care: 49 (2)
Respiratory Care
Vol. 49, Issue 2
1 Feb 2004
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Characteristics of Demand Oxygen Delivery Systems: Maximum Output and Setting Recommendations
Peter L Bliss, Robert W McCoy, Alexander B Adams
Respiratory Care Feb 2004, 49 (2) 160-165;

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Characteristics of Demand Oxygen Delivery Systems: Maximum Output and Setting Recommendations
Peter L Bliss, Robert W McCoy, Alexander B Adams
Respiratory Care Feb 2004, 49 (2) 160-165;
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