Thoracic gas volume measurements in paralyzed mice
(2004) In Annals of Biomedical Engineering 32(10). p.1420-1427- Abstract
- We have previously measured thoracic gas volume (V-TG) in spontaneously breathing mice using a whole body plethysmograph and have now extended our technique to allow for V-TG measurements during paralysis. BALB/c mice were anesthetized and placed in a body-box and ventilated via a tracheostomy cannula through the box wall. Box pressure (P-b) and tracheal pressure (P-ao) were measured during spontaneous breathing, and again after paralysis while mechanically compressing the chest. V-TG was much larger after paralysis (0.49+/-0.06 ml, positive end-expiratory pressure=2 cmH(2)O) when compared with spontaneous breathing (0.31+/-0.01 ml). External chest compression produced looping in the plots of P-b versus P-ao that was attributable to... (More)
- We have previously measured thoracic gas volume (V-TG) in spontaneously breathing mice using a whole body plethysmograph and have now extended our technique to allow for V-TG measurements during paralysis. BALB/c mice were anesthetized and placed in a body-box and ventilated via a tracheostomy cannula through the box wall. Box pressure (P-b) and tracheal pressure (P-ao) were measured during spontaneous breathing, and again after paralysis while mechanically compressing the chest. V-TG was much larger after paralysis (0.49+/-0.06 ml, positive end-expiratory pressure=2 cmH(2)O) when compared with spontaneous breathing (0.31+/-0.01 ml). External chest compression produced looping in the plots of P-b versus P-ao that was attributable to gradual changes in P-b upon release of the mechanical chest compression and had the character of thermal transients. Under the assumption that the rate of heating of the air in the chamber was proportional to the pressure applied to the animal's chest, and that any increase in air temperature was dissipated by heat absorption by the chamber walls, we developed an algorithm that corrected for the thermal events. This yielded similar results for V-TG (0.30+/-0.02 ml) as obtained during spontaneous efforts. Our method may prove particularly useful when paralysis is required for the precise measurement of lung mechanics. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/267644
- author
- Lundblad, Lennart LU ; Thompson-Figueroa, J ; Leclair, T ; Irvin, CG and Bates, JHT
- organization
- publishing date
- 2004
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- plethysmography, Boyle's law, lung mechanics
- in
- Annals of Biomedical Engineering
- volume
- 32
- issue
- 10
- pages
- 1420 - 1427
- publisher
- Springer
- external identifiers
-
- pmid:15535059
- wos:000223983400009
- scopus:8644235889
- ISSN
- 1573-9686
- DOI
- 10.1114/B:ABME.0000042229.41098.6a
- language
- English
- LU publication?
- yes
- id
- 649b022a-b09b-4fe5-bc0c-a0a323bd4bb7 (old id 267644)
- date added to LUP
- 2016-04-01 12:34:23
- date last changed
- 2023-09-02 12:27:22
@article{649b022a-b09b-4fe5-bc0c-a0a323bd4bb7,
abstract = {{We have previously measured thoracic gas volume (V-TG) in spontaneously breathing mice using a whole body plethysmograph and have now extended our technique to allow for V-TG measurements during paralysis. BALB/c mice were anesthetized and placed in a body-box and ventilated via a tracheostomy cannula through the box wall. Box pressure (P-b) and tracheal pressure (P-ao) were measured during spontaneous breathing, and again after paralysis while mechanically compressing the chest. V-TG was much larger after paralysis (0.49+/-0.06 ml, positive end-expiratory pressure=2 cmH(2)O) when compared with spontaneous breathing (0.31+/-0.01 ml). External chest compression produced looping in the plots of P-b versus P-ao that was attributable to gradual changes in P-b upon release of the mechanical chest compression and had the character of thermal transients. Under the assumption that the rate of heating of the air in the chamber was proportional to the pressure applied to the animal's chest, and that any increase in air temperature was dissipated by heat absorption by the chamber walls, we developed an algorithm that corrected for the thermal events. This yielded similar results for V-TG (0.30+/-0.02 ml) as obtained during spontaneous efforts. Our method may prove particularly useful when paralysis is required for the precise measurement of lung mechanics.}},
author = {{Lundblad, Lennart and Thompson-Figueroa, J and Leclair, T and Irvin, CG and Bates, JHT}},
issn = {{1573-9686}},
keywords = {{plethysmography; Boyle's law; lung mechanics}},
language = {{eng}},
number = {{10}},
pages = {{1420--1427}},
publisher = {{Springer}},
series = {{Annals of Biomedical Engineering}},
title = {{Thoracic gas volume measurements in paralyzed mice}},
url = {{http://dx.doi.org/10.1114/B:ABME.0000042229.41098.6a}},
doi = {{10.1114/B:ABME.0000042229.41098.6a}},
volume = {{32}},
year = {{2004}},
}