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CPAP machine performance and altitude

R E Fromm1, J Varon, A E Lechin

  • 1Department of Medicine Baylor College of Medicine, Houston, USA.

Chest
|December 1, 1995
PubMed
Summary
This summary is machine-generated.

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Continuous positive airway pressure (CPAP) therapy effectiveness can decrease at high altitudes. Altitude significantly alters CPAP pressure delivery unless the device has pressure-compensating features.

Area of Science:

  • Respiratory Medicine
  • Biomedical Engineering
  • Aerospace Medicine

Background:

  • Sleep-disordered breathing is frequently managed with continuous positive airway pressure (CPAP).
  • CPAP devices use fan-generated airflow to maintain airway patency.
  • Patient-reported issues during high-altitude travel prompted this investigation.

Purpose of the Study:

  • To evaluate the impact of simulated altitude changes on the performance of commercial CPAP machines.
  • To determine if CPAP pressure delivery is affected by variations in altitude.

Main Methods:

  • Four CPAP machines were tested in an altitude chamber using airway mannequins.
  • Simulated ascents to 12,000 feet were conducted at various sea-level pressure settings (5, 10, 12 cm H2O).

Related Experiment Videos

  • Pressure was measured at 2,000-foot intervals during ascent and descent using water manometers.

    • Main Results:

    • Mask pressure output varied with altitude in three of the four tested CPAP machines.
    • One machine, featuring pressure regulation, maintained consistent pressure across all altitudes.
    • Observed pressure changes aligned with predictions based on fan laws.

    Conclusions:

    • Altitude significantly impacts CPAP delivered pressure, consistent with fan law principles.
    • CPAP machines without pressure-compensating features exhibit altered performance at varying elevations.
    • Clinicians should consider altitude effects when prescribing CPAP for patients residing or traveling to high-elevation areas.