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Volume Guarantee Ventilation: Pressure May Reduce During Obstructed Flow
  1. Kevin I Wheeler (kevin.wheeler{at}thewomens.org.au)
  1. Royal Women's Hospital, Melbourne, Australia
    1. Colin J Morley (colin.morley{at}thewomens.org.au)
    1. Royal Women's Hospital, Melbourne, Australia
      1. C. Omar F Kamlin (omar.kamlin{at}rwh.org.au)
      1. Royal Women's Hospital, Melbourne, Australia
        1. Peter G Davis (pgd{at}unimelb.edu.au)
        1. Royal Women's Hospital, Melbourne, Australia

          Abstract

          We report two unexpected observations during ventilation with the Dräger Babylog 8000+ in volume guarantee mode. Firstly, during complete obstruction to gas flow down the endotracheal tube the inflating pressure was reduced to half-way between the maximum inflating pressure and the positive end expiratory pressure despite not achieving the set expired tidal volume. Secondly, an external Dräger waveform monitor may stop displaying real-time waveforms when a tube obstructed alarm occurs. We present an illustrative case and investigations of these phenomena using a test lung.

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