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Thoracic gas volume measurements in paralyzed mice

Lundblad, Lennart LU ; Thompson-Figueroa, J; Leclair, T; Irvin, CG and Bates, JHT (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)
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author
organization
publishing date
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
2007-10-24 21:07:54
date last changed
2017-11-05 03:48:30
@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},
  keyword      = {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},
  volume       = {32},
  year         = {2004},
}