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Related Experiment Videos

Inspired oxygen concentrations during positive pressure therapy.

Elizabeth A Yoder1, Kenneth Klann, Kingman P Strohl

  • 1Louis Stokes Cleveland DVA Medical Center, Medical Service, Center for Sleep Disorders Research, Case Western Reserve University, Cleveland, Ohio, USA. Beth.Yoder@att.net

Sleep & Breathing = Schlaf & Atmung
|March 18, 2004
PubMed
Summary

Oxygen supplementation during nasal positive pressure therapy is affected by mask leak, oxygen delivery site, and pressure settings. Higher pressures and leaks decrease the fraction of inspired oxygen (FiO2) delivered.

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Area of Science:

  • Respiratory therapy
  • Biomedical engineering
  • Pulmonary medicine

Background:

  • Nasal positive pressure therapy, such as CPAP and BiPAP, is commonly used for respiratory conditions.
  • Oxygen supplementation is often administered concurrently to improve oxygenation.
  • Understanding factors influencing delivered oxygen concentration is crucial for effective treatment.

Purpose of the Study:

  • To investigate the impact of pressure, mask leak, and oxygen administration site on the fraction of inspired oxygen (FiO2) during nasal positive pressure treatments.
  • To compare findings in a human subject and a mannequin model system.

Main Methods:

  • A healthy male volunteer and a mannequin head were used with a nasal CPAP mask and pressure source.
  • Oxygen was administered via a side port or near the machine.

Related Experiment Videos

  • Flow and FiO2 were measured under varying pressures, with and without a simulated mask leak.

    • Main Results:

    • Increased inspiratory pressure led to decreased FiO2 in both human and model systems due to increased flow.
    • A fixed mask leak increased flow and decreased FiO2 at all tested pressure levels.
    • The site of oxygen administration also influenced the delivered FiO2.

    Conclusions:

    • In patients receiving nasal positive pressure therapy with supplemental oxygen, the inspired oxygen concentration is influenced by pressure settings, mask leak, and oxygen delivery site.
    • These factors must be carefully managed to ensure adequate oxygenation.