Charcoal as an airway isoflurane reflection filter.
Eur J Anaesthesiol
; 15(2): 230-3, 1998 Mar.
Article
en En
| MEDLINE
| ID: mdl-9587731
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.
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Bases de datos:
MEDLINE
Asunto principal:
Carbón Orgánico
/
Anestésicos por Inhalación
/
Isoflurano
/
Anestesiología
Idioma:
En
Revista:
Eur J Anaesthesiol
Asunto de la revista:
ANESTESIOLOGIA
Año:
1998
Tipo del documento:
Article
País de afiliación:
Suecia