Document Detail

Effects of carbon dioxide absorbent cooling and temperature gradient reduction on water condensation in the anaesthesia circuit.
MedLine Citation:
PMID:  18029346     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Large quantities of water condensation occur in the anaesthesia circuit during low-flow anaesthesia. We hypothesized that cooling of the CO2 absorbent would prevent water condensation. METHODS: To cool CO2 absorbent efficiently, we constructed a novel temperature gradient reduction (TGR) canister, which was cooled by a blower. Experiments were divided into three groups: the conventional canister group (control group, n=6), the TGR canister without cooling group (TGR group, n=6), and the TGR canister with cooling group (TGR cooling group, n=6). One kilogramme of CO2 absorbent was placed into the canister. The anaesthetic ventilator was connected to a 3 litre bag and 300 ml min(-1) of CO2 was introduced. About 500 ml min(-1) of oxygen was used as fresh gas. The anaesthetic ventilator was set at a ventilatory frequency of 12 bpm, and tidal volume was adjusted to 700 ml. RESULTS: The longevity of the CO2 absorbent was 437 (sd 7.8) min in the control group, 564 (13.8) min in the TGR group (P<0.001 vs control), and 501 (5.8) min in the TGR cooling group (P<0.001 vs control, TGR). Total water condensation in the anaesthesia circuit was 215 (9.4) mg min(-1) in the control group, 223 (9.7) mg min(-1) in the TGR group, and 47.7 (5.7) mg min(-1) in the TGR cooling group (P<0.001 vs control, TGR). CONCLUSIONS: TGR of CO2 absorbent with cooling is a useful and simple method to reduce water condensation in the anaesthesia circuit in low-flow anaesthesia, with a little increase in the longevity of the CO2 absorbent.
G Hirabayashi; H Uchino; T Joko; H Kaneko; N Ishii
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-11-19
Journal Detail:
Title:  British journal of anaesthesia     Volume:  100     ISSN:  1471-6771     ISO Abbreviation:  Br J Anaesth     Publication Date:  2008 Jan 
Date Detail:
Created Date:  2007-12-11     Completed Date:  2008-01-14     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0372541     Medline TA:  Br J Anaesth     Country:  England    
Other Details:
Languages:  eng     Pagination:  131-6     Citation Subset:  IM    
Department of Anesthesiology, Hachioji Medical Center, Tokyo Medical University, 1163 Tatemachi, Hachioji, Tokyo 193-0998, Japan.
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MeSH Terms
Anesthesia, Closed-Circuit / instrumentation*
Carbon Dioxide / chemistry*
Equipment Failure
Gas Scavengers*
Water / analysis*
Reg. No./Substance:
124-38-9/Carbon Dioxide; 7732-18-5/Water

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