Heating of gases during neonatal resuscitation: A bench study

Shearman, Andrew D., Hou, David, Dunster, Kimble R. and Jardine, Luke (2012) Heating of gases during neonatal resuscitation: A bench study. Resuscitation, 83 3: 369-373. doi:10.1016/j.resuscitation.2011.08.027

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Author Shearman, Andrew D.
Hou, David
Dunster, Kimble R.
Jardine, Luke
Title Heating of gases during neonatal resuscitation: A bench study
Journal name Resuscitation   Check publisher's open access policy
ISSN 0300-9572
Publication date 2012-03-01
Year available 2011
Sub-type Article (original research)
DOI 10.1016/j.resuscitation.2011.08.027
Open Access Status
Volume 83
Issue 3
Start page 369
End page 373
Total pages 5
Place of publication Elsevier Ireland, Ltd.
Publisher Shannon, Co. Clare, Ireland
Language eng
Formatted abstract
Aim

Standard practice within the neonatal unit is to use heated humidified gas as it decreases respiratory complications in neonates requiring respiratory support. Using cold unhumidified gases during resuscitation could potentially cool the baby as well as exacerbate potential lung injury. We aimed to study the temperature and humidity aspects of using heated, humidified gas for neonatal resuscitation.

Methods

A heated patient circuit was connected to a T-piece resuscitator via a humidifier. An oxygen flowmeter was set at 10 L/min. Temperature recordings at the humidifier chamber (T1), distal temperature probe (T2) and T-piece (T3) were taken over 20 min at 30 s intervals. A humidity sensor was placed at T3.

Results

Target temperatures were not reached. Time to 36 °C (mean (sd)): T1 11.1 min (1.71); T3 11.6 min (1.77). T2 took 13.6 min (1.07) to reach 39 °C. T1 and T3 were within ±1 °C at 5.1 min (0.6). A biphasic relationship demonstrated the time lag between the temperatures of the heated patient circuit and the humidifier chamber. T3 strongly correlated to T1 when T1 is ≥28 °C (r2 = 0.85). Humidity was difficult to measure and results were inferred from temperature recordings.

Conclusion


This in vitro test showed that heated, humidified gas is possible during neonatal resuscitation. Adequate time must be allowed for the humidifier chamber to warm to near optimal temperature. The patient circuit is initially heated faster than the humidifier chamber. The displayed T1 temperature correlates to the temperature at T3 at ≥28 °C.
Keyword Neonatal resuscitation
Infant
T-piece resuscitator
Humidification
Temperature
Bench test
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 28 September 2011.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Medicine Publications
 
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Created: Fri, 02 Dec 2011, 18:59:17 EST by Matthew Lamb on behalf of School of Medicine