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

Jardine, L., Dunster, K.R. and Davies, M.W. (2008) An experimental model for the measurement of inspired gas temperatures in ventilated neonates. Pediatric Pulmonology, 43 1: 29-33. doi:10.1002/ppul.20731

Author Jardine, L.
Dunster, K.R.
Davies, M.W.
Title An experimental model for the measurement of inspired gas temperatures in ventilated neonates
Journal name Pediatric Pulmonology   Check publisher's open access policy
ISSN 8755-6863
Publication date 2008-01-01
Year available 2008
Sub-type Article (original research)
DOI 10.1002/ppul.20731
Open Access Status Not yet assessed
Volume 43
Issue 1
Start page 29
End page 33
Total pages 5
Editor Chernick, V
Place of publication United States
Publisher John Wiley & Sons, Inc.
Language eng
Subject C1
920501 Child Health
111403 Paediatrics
Abstract Objective To determine the inspired gas temperature at points from the endo-tracheal tube (ETT) circuit manifold to the tip of the ETT in a model neonatal lung. Design A model lung attached to standard ventilator circuit, autofeed chamber and humidifier was ventilated using typical pressure-limited, time cycled settings. Temperatures were measured at various distances along the ETT using a K-type thermocouple temperature probe. Results The inspired gas temperature dropped from the circuit temperature probe site (40 degrees C) to the proximal end of the ETT (37 degrees C). The temperature dropped further as it passed through the exposed part of the ETT (34 degrees C) but then warmed again on entering the lung model so that the inspired gas at the distal end of the ETT was 37 degrees C. Statistically significant differences were found with a one-way ANOVA P-value of < 0.0001. The differences between each pair of mean temperatures were statistically significant (all P < 0.001) except when comparing the proximal end of the ETT with midway down the ETT (Bonferroni's Multiple Comparison Test, P > 0.05). Conclusions Inspired gas temperature drops as it passes through the circuit temperature probe site, the proximal end of the ETT and the exposed part of the ETT The inspired gas rewarms on entering the model lung and exits the ETT at the desired temperature. The effect of measuring temperature closer to the patient, setting the circuit temperature higher and/or increasing the ambient temperature through which the circuit passes, need to be evaluated.
Keyword Pediatrics
Respiratory System
Respiratory System
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Medicine Publications
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Created: Thu, 16 Apr 2009, 22:06:36 EST by Amanda Jones on behalf of Paediatrics & Child Health - RBWH