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Airway pressures during closed system suctioning.

J A Taggart1, N L Dorinsky, J S Sheahan

  • 1Ohio State University Hospitals, Department of Critical Care Nursing, Columbus 43210.

Heart & Lung : the Journal of Critical Care
|September 1, 1988
PubMed
Summary
This summary is machine-generated.

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Closed system suctioning (CSS) can cause negative airway pressure, especially with certain ventilator settings. This in vitro study analyzed airway pressures during CSS to identify risks associated with mechanical ventilation.

Area of Science:

  • Respiratory Therapy
  • Critical Care Medicine
  • Biomedical Engineering

Background:

  • Closed system suctioning (CSS) maintains mechanical ventilation, oxygenation, and PEEP.
  • Potential for negative airway pressure during CSS exists with incorrect ventilator settings.

Purpose of the Study:

  • To investigate airway pressures during CSS using various ventilators and settings.
  • To identify risks of negative airway pressure during CSS in mechanically ventilated patients.

Main Methods:

  • In vitro study using a test lung and CSS system.
  • Tested different ventilators, peak inspiratory flow rates, sensitivities, and PEEP levels.
  • Measured peak positive and negative airway pressures during suctioning.

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Main Results:

  • Negative airway pressure exceeded -10 cm H2O in most tested situations.
  • Specific ventilators (Bennett MA1, Bourns-Bear 1 & 2) in control mode generated sustained negative pressures below -50 cm H2O.

Conclusions:

  • Ventilator settings significantly impact airway pressure during CSS.
  • Careful selection of ventilator parameters is crucial to avoid excessive negative airway pressure during CSS.