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Related Experiment Videos

Inspired gas temperature in ventilated neonates.

Mark William Davies1, Kimble Robert Dunster, David William Cartwright

  • 1Grantley Stable Neonatal Unit, Royal Women's Hospital, Brisbane, Queensland, Australia. Mark_Davies@health.qld.gov.au

Pediatric Pulmonology
|June 2, 2004
PubMed
Summary

Inspired gas delivered to ventilated neonates is cooler than expected at the airway opening. Actual temperatures measured significantly below the set 37°C, indicating a need to re-evaluate current humidification practices.

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An experimental model for the measurement of inspired gas temperatures in ventilated neonates.

Pediatric pulmonology·2007

Area of Science:

  • Neonatal intensive care
  • Respiratory physiology
  • Medical device engineering

Background:

  • Warming and humidifying inspired gases is standard practice for neonates requiring mechanical ventilation.
  • Current data is lacking regarding the precise temperature of inspired gas at the airway opening in this population.
  • The established target temperature for inspired gas is 37°C.

Purpose of the Study:

  • To measure the actual temperature of inspired gas at the airway opening in ventilated neonates.
  • To compare the airway opening temperature with the temperature measured at the circuit exit.
  • To determine if the set humidifier and circuit temperatures accurately reflect the delivered gas temperature.

Main Methods:

  • An observational study was conducted in a neonatal intensive care unit.

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  • Twenty-five mechanically ventilated infants were enrolled.
  • Temperature probes were placed at the circuit exit and airway opening to record temperatures.

    • Main Results:

    • The mean temperature at the airway opening was 34.9°C in infants in incubators and 33.1°C in infants under radiant warmers.
    • A significant temperature drop occurred between the circuit exit and the airway opening, averaging 2.0°C in incubators and 3.9°C under radiant warmers.
    • The circuit temperature probe readings did not accurately represent the temperature delivered to the neonate's airway.

    Conclusions:

    • Inspired gas temperature at the airway opening is consistently lower than the target 37°C with standard equipment and settings.
    • The temperature at the circuit probe is an unreliable indicator of the actual delivered gas temperature.
    • Clinical practices for gas humidification and warming in ventilated neonates may require adjustment to ensure optimal patient temperature.