Advanced Search

Journal Navigation

Journal Home

Subscriptions

Archive

Contact Us

Table of Contents

Click here to sign up for SAGE Journal Email Alerts today!

Sign In to gain access to subscriptions and/or personal tools.
Journal of Parenteral and Enteral Nutrition
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Add to Saved Citations
Right arrow Download to citation manager
Right arrowRequest Permissions
Right arrow Request Reprints
Right arrow Add to My Marked Citations
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Right arrow Citing Articles via Scopus
Google Scholar
Right arrow Articles by Dietrich, K. A.
Right arrow Articles by Conrad, S. A.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Dietrich, K. A.
Right arrow Articles by Conrad, S. A.
Social Bookmarking
Add to CiteULike   Add to Complore   Add to Connotea   Add to Del.icio.us   Add to Digg   Add to Reddit   Add to Technorati   Add to Twitter  
What's this?

Effects of Gas Leak Around Endotracheal Tubes on Indirect Calorimetry Measurement

Kenneth A. Dietrich, M.D.

Departments of Pediatrics, Cardiopulmonary Science and Medicine, Louisiana State University Medical Center, Shreveport, Louisiana

Michael D. Romero, R.R.T.

Departments of Pediatrics, Cardiopulmonary Science and Medicine, Louisiana State University Medical Center, Shreveport, Louisiana

Steven A. Conrad, M.D., PH.D.

Departments of Pediatrics, Cardiopulmonary Science and Medicine, Louisiana State University Medical Center, Shreveport, Louisiana

The use of uncuffed endotracheal tubes (ETT) in pediatric patients raises concern over the accuracy of indirect calorimetry measurement in the presence of a gas leak around an ETT. We examined the effects of ETT gas leak on respiratory gas measurements in a dog model.

Mongrel dogs (n=12) were sedated, paralyzed, intubated, and placed on mechanical ventilation. Leak was achieved by adjusting cuff volume. Oxygen consumption (VO2), CO2 production (VCO2), respiratory exchange ratio (RER), and resting energy expenditure (REE) were measured at each leak pressure (Pleak). Peak inspiratory pressure (PIP), Pleak, inspiratory and expiratory tidal volume (VTinsp, VTexp), VE, end tidal CO2 (ETCO2), and blood gases were recorded at each leak pressure.

VO2, VCO 2, and REE decreased significantly with increasing gas leak. There was a linear relationship between VO2, VCO2, and REE with both TVratio (VTexp/VTinsp) and Pdiff (PIP-Pleak). Multiple regression equations based on TVratio and Pdiff were obtained which allowed correction of the measurement error in VO2, VCO2, and REE, with correlation coefficients (R2) of 0.71, 0.75, and 0.73, respectively.

ETT gas leak affects measurements of VO2, VCO2, and REE, but not RER. Measurements made with TVratio > 0.80 required no correction. Measurements made with TVratio > 0.45 could be corrected to actual values in our model with regression equations based on TVratio and Pdiff. We conclude that indirect calorimetry measurements can be useful in the presence of tracheal gas leak around an ETT. (Journal of Parenteral and Enteral Nutrition 14:408-413, 1990)

Journal of Parenteral and Enteral Nutrition, Vol. 14, No. 4, 408-413 (1990)
DOI: 10.1177/0148607190014004408
Add to CiteULike CiteULike   Add to Complore Complore   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us   Add to Digg Digg   Add to Reddit Reddit   Add to Technorati Technorati   Add to Twitter Twitter    What's this?


This article has been cited by other articles:


Home page
 Nutr Clin PractHome page
R. D. Branson and J. A. Johannigman
The Measurement of Energy Expenditure
Nutr Clin Pract, December 1, 2004; 19(6): 622 - 636.
[Abstract] [Full Text] [PDF]