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Related Experiment Videos

Choosing a negative pressure ventilation pump: are there any important differences?

I E Smith1, M A King, J M Shneerson

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

The European Respiratory Journal
|October 1, 1995
PubMed
Summary
This summary is machine-generated.

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Performance of five negative pressure ventilator pumps varied significantly. NEV-100 and Negavent pumps are better for patients with upper airway obstruction, while CCP-001 and Newmarket pumps are preferable for managing leaks.

Area of Science:

  • Biomedical Engineering
  • Respiratory Physiology

Background:

  • Negative pressure ventilation is crucial for respiratory support.
  • Understanding ventilator pump performance is essential for clinical application.
  • Variations in pump waveforms and leak compensation can impact patient outcomes.

Purpose of the Study:

  • To compare the clinical performance of five different negative pressure ventilator pumps.
  • To assess the relationship between pressure waveform, tidal volume, and leak compensation.
  • To identify pump characteristics advantageous for specific patient conditions.

Main Methods:

  • A patient model was used to evaluate ventilator pump performance.
  • Tests included continuous 8-hour stability, tidal volume generation, and response to leaks.

Related Experiment Videos

  • Pressure waveforms, inspiratory/expiratory (I:E) ratio, rate, and peak negative pressure were analyzed.

    • Main Results:

    • All pumps demonstrated stable performance within +/- 1% for I:E ratio and rate, and +/- 10% for peak negative pressure.
    • NEV-100 and Negavent pumps produced a square wave, yielding up to 30% greater tidal volume than CCP-001 and Newmarket pumps (half sine wave).
    • NEV-100 and Negavent showed nearly complete leak compensation, while CCP-001 and Newmarket had rapid but less complete compensation. Maxivent had no leak compensation.

    Conclusions:

    • NEV-100 and Negavent pumps are advantageous for patients prone to upper airway obstruction due to their pressure waveform.
    • CCP-001 and Newmarket pumps are preferable when managing patients with rapidly changing leaks.
    • The Maxivent pump demonstrated no significant advantages over the other tested models.