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Resonant amplification and flow/pressure characteristics in high-frequency ventilation

  • Biomechanics
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Abstract

In an in vitro study, the influence of different basic characteristics of high-frequency oscillation (HFO) circuits upon pressure and flow patterns was investigated for a wide variety of lung surrogates. A distinct resonant amplification was observed: the delivered oscillatory volume was found to exceed the piston displacement up to a factor of 1.6. In the whole frequency range of 0–70 Hz the delivered oscillatory volume and its resonance characteristics were entirely determined by the HFO circuit and independent of the properties of the lung surrogates investigated. Accordingly, it appears to be possible to determine the delivered oscillatory volume in vitro and to calibrate the HFO circuit also for use under physiological conditions. in the formation of mean pressure, contributions were found which emerged outside the lung surrogate. They were highly dependent on the HFO circuit arrangement and were superimposed to the local mean pressure components in the lung.

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Authors and Affiliations

  1. Institute of Anesthesiology, University Hospital, 8091, Zürich, Switzerland

    D. R. Spahn & E. R. Schmid

  2. Institute of Biomedical Engineering, University of Zürich and Swiss Federal Institute of Technology, 8092, Zürich, Switzerland

    E. H. Bush & P. F. Niederer

Authors
  1. D. R. Spahn
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  2. E. H. Bush
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  3. E. R. Schmid
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  4. P. F. Niederer
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Spahn, D.R., Bush, E.H., Schmid, E.R. et al. Resonant amplification and flow/pressure characteristics in high-frequency ventilation. Med. Biol. Eng. Comput. 26, 355–359 (1988). https://doi.org/10.1007/BF02442291

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  • DOI: https://doi.org/10.1007/BF02442291

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