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Related Experiment Videos

Mechanical ventilator design and function: the trigger variable.

C S Sassoon1

  • 1University of California, Irvine.

Respiratory Care
|September 1, 1992
PubMed
Summary
This summary is machine-generated.

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Flow-triggering offers advantages over pressure-triggering in ventilators, especially during spontaneous breathing, by reducing trigger delay. Flow-by systems also lower inspiratory muscle work compared to demand-flow systems.

Area of Science:

  • Mechanical Ventilation
  • Respiratory Physiology

Background:

  • Pressure-triggering and flow-triggering are key mechanisms in mechanical ventilators.
  • Spontaneous breathing requires precise trigger sensitivity and minimal delay for patient comfort and synchrony.

Framework:

  • Flow-triggering demonstrates a shorter time delay during the trigger phase compared to pressure-triggering.
  • Flow-by systems optimize flow delivery, maintaining airway pressure and reducing inspiratory muscle work.

Implementation:

  • Achieving optimal trigger sensitivity with flow-triggering prevents autocycling while maintaining short delays.
  • The circuit pressure-sensing site impacts the post-trigger phase control algorithm in flow-by and demand-flow systems.

Implications:

Related Experiment Videos

  • Flow-triggering may reduce inspiratory muscle work, though its effect on the pressure-time product requires further study.
  • Advanced ventilator algorithms or pressure support can mitigate post-triggering issues in microprocessor-based ventilators, but trigger phase impacts remain less clear.