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Related Experiment Videos

Functional differences in bi-level pressure preset ventilators.

M P Highcock1, J M Shneerson, I E Smith

  • 1Respiratory Support and Sleep Centre, Papworth Hospital, Papworth Everard, Cambridge, UK.

The European Respiratory Journal
|May 4, 2001
PubMed
Summary
This summary is machine-generated.

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This study compared four bilevel positive pressure ventilators, finding significant differences in trigger performance and response to patient effort. Ventilator selection is crucial for breathless patients with ventilatory failure.

Area of Science:

  • Medical Devices
  • Respiratory Physiology
  • Biomedical Engineering

Background:

  • Bilevel positive pressure preset ventilators are essential for managing respiratory failure.
  • Understanding device-specific performance is critical for optimizing patient care.

Purpose of the Study:

  • To compare the performance of four bilevel positive pressure preset ventilators: BiPAP ST30, Nippy2, Quantum PSV, and Sullivan VPAP H ST.
  • To evaluate ventilator sensitivity, response to leaks, and patient effort using a patient simulator.

Main Methods:

  • Utilized a patient simulator to assess trigger delay time, inspiratory trigger pressure, and tidal volume (VT) changes.
  • Simulated circuit leaks and varying patient inspiratory efforts (0.25s and 1s).
  • Recorded trigger failures and minute volume changes at high respiratory frequencies.

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Main Results:

  • Significant differences (p <0.05) were observed in trigger delay and inspiratory trigger pressure between ventilators.
  • Tidal volume decreased by less than 10% with a simulated leak.
  • Patient effort responses were variable, with some ventilators showing increased VT at 1s effort, while others experienced trigger failures and reduced minute volume at high frequencies.

Conclusions:

  • Performance variations among bilevel positive pressure ventilators necessitate careful selection for individual patient needs.
  • Device response to patient effort and trigger sensitivity are key factors, especially for breathless patients with ventilatory failure.