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Trigger delay in infant ventilators

A Liubsys1, T Norsted, A Jonzon

  • 1Department of Pediatrics, Uppsala University, Sweden.

Upsala Journal of Medical Sciences
|January 1, 1997
PubMed

Insights

Infant ventilators with flow sensors and synchronized intermittent mandatory ventilation (SIMV) show shorter response trigger delays. This technology is suitable for infant weaning when breathing rates are below 60 breaths per minute.

Area of Science:

  • Biomedical Engineering
  • Pediatric Critical Care

Background:

  • Infant ventilators require precise timing to support spontaneous breathing.
  • Detecting spontaneous breaths is crucial for effective ventilatory support and weaning.

Purpose of the Study:

  • To determine the response trigger delay time of infant ventilators.
  • To compare trigger delay across different ventilator sensor types and modes.

Main Methods:

  • Experimental study in anesthetized cats measuring the time from phrenic nerve activity to airway pressure increase.
  • Tested two ventilatory modes: Assist/Control (A/C) and synchronized intermittent mandatory ventilation (SIMV).
  • Evaluated ventilators with endotracheal tube flow sensors versus abdominal sensors.

Main Results:

  • Ventilators with flow sensors near the endotracheal tube exhibited shorter trigger delays than those with abdominal sensors.
  • Synchronized intermittent mandatory ventilation (SIMV) mode demonstrated shorter trigger delays compared to Assist/Control (A/C) mode.
  • Increased sensitivity settings resulted in reduced response times.

Conclusions:

  • Triggered ventilation is feasible for infants with spontaneous breathing rates below 60 breaths per minute.
  • This mode of ventilation shows potential for facilitating ventilator weaning in infants.

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