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Charcoal as an airway isoflurane reflection filter

Dahm, S L; Steptoe, P; Luttropp, Hans-Henrik LU and Reinstrup, Peter LU (1998) In European Journal of Anaesthesiology 15(2). p.230-233
Abstract
The isoflurane-saving and CO2-retaining effects of a charcoal filter were compared with a Siemens standard heat and moisture (HME) exchanger and an emptied specimen (dummy). Isoflurane was delivered during the inspiratory phase and consumption investigated at 10, 15 and 25 cycles min-1. The investigation was performed by ventilation with humidified air with a constant end-tidal CO2 and temperature. For a comparison, isoflurane was delivered in a conventional manner via the ventilator. The arrangement with a charcoal filter reduced the isoflurane consumption by a factor of 2.0-2.6, depending on ventilatory rate. Most of the saving was a result of the method of isoflurane delivery (factor 1.4-2.0), while adding the reflector gave a further... (More)
The isoflurane-saving and CO2-retaining effects of a charcoal filter were compared with a Siemens standard heat and moisture (HME) exchanger and an emptied specimen (dummy). Isoflurane was delivered during the inspiratory phase and consumption investigated at 10, 15 and 25 cycles min-1. The investigation was performed by ventilation with humidified air with a constant end-tidal CO2 and temperature. For a comparison, isoflurane was delivered in a conventional manner via the ventilator. The arrangement with a charcoal filter reduced the isoflurane consumption by a factor of 2.0-2.6, depending on ventilatory rate. Most of the saving was a result of the method of isoflurane delivery (factor 1.4-2.0), while adding the reflector gave a further reduction (factor 1.3-1.5). One circumstance that reduced the net efficiency of the charcoal filter was that it also reflected CO2; consequently, total minute ventilation had to be increased to maintain constant end-tidal CO2. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
anaesthetic, volatile, isoflurane, equipment, charcoal filter, physics, gas adsorption
in
European Journal of Anaesthesiology
volume
15
issue
2
pages
230 - 233
publisher
European Society of Anaesthesiology
external identifiers
  • pmid:9587731
  • scopus:0031865790
ISSN
1365-2346
DOI
10.1111/j.0265-0215.1998.00260.x
language
English
LU publication?
yes
id
d694a271-f7ae-47b3-8712-2d11e79b0482 (old id 1113192)
date added to LUP
2008-07-14 13:53:10
date last changed
2017-01-01 05:09:21
@article{d694a271-f7ae-47b3-8712-2d11e79b0482,
  abstract     = {The isoflurane-saving and CO2-retaining effects of a charcoal filter were compared with a Siemens standard heat and moisture (HME) exchanger and an emptied specimen (dummy). Isoflurane was delivered during the inspiratory phase and consumption investigated at 10, 15 and 25 cycles min-1. The investigation was performed by ventilation with humidified air with a constant end-tidal CO2 and temperature. For a comparison, isoflurane was delivered in a conventional manner via the ventilator. The arrangement with a charcoal filter reduced the isoflurane consumption by a factor of 2.0-2.6, depending on ventilatory rate. Most of the saving was a result of the method of isoflurane delivery (factor 1.4-2.0), while adding the reflector gave a further reduction (factor 1.3-1.5). One circumstance that reduced the net efficiency of the charcoal filter was that it also reflected CO2; consequently, total minute ventilation had to be increased to maintain constant end-tidal CO2.},
  author       = {Dahm, S L and Steptoe, P and Luttropp, Hans-Henrik and Reinstrup, Peter},
  issn         = {1365-2346},
  keyword      = {anaesthetic,volatile,isoflurane,equipment,charcoal filter,physics,gas adsorption},
  language     = {eng},
  number       = {2},
  pages        = {230--233},
  publisher    = {European Society of Anaesthesiology},
  series       = {European Journal of Anaesthesiology},
  title        = {Charcoal as an airway isoflurane reflection filter},
  url          = {http://dx.doi.org/10.1111/j.0265-0215.1998.00260.x},
  volume       = {15},
  year         = {1998},
}