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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
; ; and
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
2016-04-01 12:27:11
date last changed
2022-01-27 03:55:11
@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}},
  keywords     = {{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}},
  doi          = {{10.1111/j.0265-0215.1998.00260.x}},
  volume       = {{15}},
  year         = {{1998}},
}