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  • Poster presentation
  • Open Access

Performance of ventilators at simulated altitude: study of fraction of inspired oxygen

  • 1,
  • 1,
  • 1,
  • 1,
  • 1,
  • 1 and
  • 1
Critical Care201014 (Suppl 1) :P273

https://doi.org/10.1186/cc8505

  • Published:

Keywords

  • Oxygen
  • Delivery System
  • Emergency Medicine
  • Normal Lung
  • Inspire Oxygen

Introduction

We studied the performance of two respirators employing an advanced turbine delivery system: LTV 1000, Tbird VSO2. We assessed the ability of the ventilators to deliver to a normal lung model a set fraction of inspired oxygen (FiO2) at different simulated cabin altitudes.

Methods

We used a decompression chamber to mimic the hypobaric environment at a range of simulated cabin altitudes of 1,500, 2,000 and 3,000 meters (4,000, 5,333, 8,000 feet). A model of normal lung was used. Concerning the Tbird VSO2, cabin altitude was input. Ventilators were tested with FiO2 set at 50% and Vt set at 700 ml. We noted the effective FiO2 assessed by the ventilators (paramagnetic analysis). We measured the FiO2 really delivered with a dedicated instrument of the French physiological laboratory of aviation and space medicine of the Air Force. Comparisons of preset and assessed FiO2 to actual measured FiO2 were accomplished using a t test for each altitude.

Results

Figure 1 shows the data with FiO2 set at 50%.

Figure 1

Conclusions

On one hand, both ventilators showed a moderate variation between FiO2 set and delivered. On the other hand, variations between FiO2 delivered and assessed are high, suggesting inefficacity of ventilators' paramagnetic analysis in hypobaric conditions.

Authors’ Affiliations

(1)
Hopital Val-de-Grâce, Paris, France

Copyright

© BioMed Central Ltd. 2010

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