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Temperature loss by ventilation in a calorimetric bench model

In intensive care medicine heat moisture exchangers are standard tools to warm and humidify ventilation gases in order to prevent temperature loss of patients or airway epithelia damage. Despite being at risk of hypothermia especially after trauma, intubated emergency medicine patients are often ven...

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Autores principales: Herff, Holger, Schroeder, Daniel C., Bowden, Kevin, Paal, Peter, Mitterlechner, Thomas, Wenzel, Volker
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Wolters Kluwer - Medknow 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7871931/
https://www.ncbi.nlm.nih.gov/pubmed/32189666
http://dx.doi.org/10.4103/2045-9912.279980
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author Herff, Holger
Schroeder, Daniel C.
Bowden, Kevin
Paal, Peter
Mitterlechner, Thomas
Wenzel, Volker
author_facet Herff, Holger
Schroeder, Daniel C.
Bowden, Kevin
Paal, Peter
Mitterlechner, Thomas
Wenzel, Volker
author_sort Herff, Holger
collection PubMed
description In intensive care medicine heat moisture exchangers are standard tools to warm and humidify ventilation gases in order to prevent temperature loss of patients or airway epithelia damage. Despite being at risk of hypothermia especially after trauma, intubated emergency medicine patients are often ventilated with dry and in winter probably cold ventilation gases. We tried to assess the amount of temperature-loss due to ventilation with cold, dry medical oxygen in comparison to ventilation with warm and humidified oxygen. We ventilated a 50-kg water-dummy representing the calorimetric capacity of a 60-kg patient over a period of 2 hours (tidal volume 6.6 mL/kg = 400 mL; respiratory rate 13/min). Our formal null-hypothesis was that there would be no differences in temperature loss in a 50 kg water-dummy between ventilation with dry oxygen at 10°C vs. ventilation with humidified oxygen at 43°C. After 2 hours the temperature in the water-dummy using cold and dry oxygen was 29.7 ± 0.1°C compared to 30.4 ± 0.1°C using warm and humidified oxygen. This difference in cooling rates between both ventilation attempts of 0.7 ± 0.1°C after 2 hours represents an increased cooling rate of ~0.35°C per hour. Ventilation with cool, dry oxygen using an automated transport ventilator resulted in a 0.35°C faster cooling rate per hour than ventilation with warm humidified oxygen in a bench model simulating calorimetric features of a 60-kg human body.
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spelling pubmed-78719312021-02-10 Temperature loss by ventilation in a calorimetric bench model Herff, Holger Schroeder, Daniel C. Bowden, Kevin Paal, Peter Mitterlechner, Thomas Wenzel, Volker Med Gas Res Research Article In intensive care medicine heat moisture exchangers are standard tools to warm and humidify ventilation gases in order to prevent temperature loss of patients or airway epithelia damage. Despite being at risk of hypothermia especially after trauma, intubated emergency medicine patients are often ventilated with dry and in winter probably cold ventilation gases. We tried to assess the amount of temperature-loss due to ventilation with cold, dry medical oxygen in comparison to ventilation with warm and humidified oxygen. We ventilated a 50-kg water-dummy representing the calorimetric capacity of a 60-kg patient over a period of 2 hours (tidal volume 6.6 mL/kg = 400 mL; respiratory rate 13/min). Our formal null-hypothesis was that there would be no differences in temperature loss in a 50 kg water-dummy between ventilation with dry oxygen at 10°C vs. ventilation with humidified oxygen at 43°C. After 2 hours the temperature in the water-dummy using cold and dry oxygen was 29.7 ± 0.1°C compared to 30.4 ± 0.1°C using warm and humidified oxygen. This difference in cooling rates between both ventilation attempts of 0.7 ± 0.1°C after 2 hours represents an increased cooling rate of ~0.35°C per hour. Ventilation with cool, dry oxygen using an automated transport ventilator resulted in a 0.35°C faster cooling rate per hour than ventilation with warm humidified oxygen in a bench model simulating calorimetric features of a 60-kg human body. Wolters Kluwer - Medknow 2020-03-13 /pmc/articles/PMC7871931/ /pubmed/32189666 http://dx.doi.org/10.4103/2045-9912.279980 Text en Copyright: © 2020 Medical Gas Research http://creativecommons.org/licenses/by-nc-sa/4.0 This is an open access journal, and articles are distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License, which allows others to remix, tweak, and build upon the work non-commercially, as long as appropriate credit is given and the new creations are licensed under the identical terms.
spellingShingle Research Article
Herff, Holger
Schroeder, Daniel C.
Bowden, Kevin
Paal, Peter
Mitterlechner, Thomas
Wenzel, Volker
Temperature loss by ventilation in a calorimetric bench model
title Temperature loss by ventilation in a calorimetric bench model
title_full Temperature loss by ventilation in a calorimetric bench model
title_fullStr Temperature loss by ventilation in a calorimetric bench model
title_full_unstemmed Temperature loss by ventilation in a calorimetric bench model
title_short Temperature loss by ventilation in a calorimetric bench model
title_sort temperature loss by ventilation in a calorimetric bench model
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7871931/
https://www.ncbi.nlm.nih.gov/pubmed/32189666
http://dx.doi.org/10.4103/2045-9912.279980
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