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Related Experiment Videos

Oxygen delivery using self-inflating resuscitation bags.

Bradley G Carter1, Bronwyn Fairbank, James Tibballs

  • 1Paediatric Intensive Care Unit, Royal Children's Hospital, Parkville, Victoria, Australia. icu.tech@rch.org.au

Pediatric Critical Care Medicine : a Journal of the Society of Critical Care Medicine and the World Federation of Pediatric Intensive and Critical Care Societies
|February 26, 2005
PubMed
Summary

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Self-inflating resuscitators deliver less oxygen than expected for spontaneously breathing patients. Flow rates were significantly lower than inlet flows, especially at higher rates.

Area of Science:

  • Medical Devices
  • Respiratory Therapy
  • Biomedical Engineering

Background:

  • Self-inflating resuscitators are sometimes used to provide oxygen to spontaneously breathing patients.
  • This method assumes free oxygen flow from the patient outlet via a loosely fitted mask.
  • The actual oxygen delivery in this application is not well-characterized.

Purpose of the Study:

  • To quantify the oxygen delivery from the patient outlet of self-inflating resuscitators.
  • To assess the impact of different inlet flow rates on oxygen delivery.
  • To evaluate the influence of resuscitator orientation on oxygen delivery.

Main Methods:

  • Bench testing of 11 self-inflating resuscitators.
  • Measurement of patient outlet flow at various inlet flows (5, 10, 15 L/min).

Related Experiment Videos

  • Testing in both upright and inverted orientations of the reservoir valve assembly.

    • Main Results:

    • Patient outlet flow was consistently lower than the inlet flow across all tested resuscitators.
    • In some cases, outlet flow was as low as 20% of the inlet flow.
    • Increasing inlet flow decreased the percentage of outlet flow delivered, particularly in the upright position.

    Conclusions:

    • Self-inflating resuscitators do not deliver the full inlet oxygen flow to spontaneously breathing patients.
    • The delivered oxygen flow is variable and significantly less than the input flow.
    • These devices should not be relied upon for precise oxygen delivery in this clinical scenario.