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BJA Advance Access published online on August 1, 2006
British Journal of Anaesthesia, doi:10.1093/bja/ael210
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© The Board of Management and Trustees of the British Journal of Anaesthesia 2006. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Accepted May 19, 2006

Laboratory Investigation

Effects of temperature gradient correction of carbon dioxide absorbent on carbon dioxide absorption{dagger}

G. Hirabayashi 1 *, H. Uchino 1, T. Sagara 1, T. Kakinuma 1, Y. Ogihara 1, and N. Ishii 1

1 Department of Anaesthesiology, Hachioji Medical Center Tokyo Medical University, 1163 Tatemachi, Hachioji, Tokyo 193-0998, Japan

* To whom correspondence should be addressed.
G. Hirabayashi, E-mail: goh{at}tokyo-med.ac.jp


  Abstract

Background. The effects of temperature gradients in CO2 absorbents on water content and CO2 absorption are not clear. We constructed a novel temperature gradient correction (TGC) canister, and investigated the effects of temperature gradient correction on the water content and longevity (time to exhaustion) of CO2 absorbent using a simulated anaesthesia circuit.

Methods. Experiments were divided into two groups according to the type of canister used: the TGC canister (n=6) or the conventional canister (n=6). One kilogram of fresh 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. Oxygen (500 ml min-1) 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. Before the experiment, the water content of the fresh CO2 absorbent in the conventional canister and TGC canister was 16.1 (0.9)% and 15.7 (1.1)%, respectively. After the experiment, the water content of CO2 absorbent near the upper outer rim of the canister increased to 32.4 (0.7)% in the conventional canister, but increased to only 20.6 (1.3)% in the TGC canister (P<0.01). The longevity of CO2 absorbent in the conventional canister and TGC canister was 434 (9) min and 563 (13) min (P<0.01).

Conclusions. Temperature gradient correction prevented a local excessive increase in water content and improved the longevity of CO2 absorbent.

Keywords: anaesthetic circuits; carbon dioxide, elimination.
{dagger}Declaration of interest. All experiments were performed in the Department of Anaesthesiology, Hachioji Medical Center Tokyo Medical University.
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G. Hirabayashi, H. Uchino, T. Joko, H. Kaneko, and N. Ishii
Effects of carbon dioxide absorbent cooling and temperature gradient reduction on water condensation in the anaesthesia circuit
Br. J. Anaesth., January 1, 2008; 100(1): 131 - 136.
[Abstract] [Full Text] [PDF]

E-letters:

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CO2 Absorption after Changing the Absorber design
Erich Knolle, et al.
British Journal of Anaesthesia, 14 Aug 2007 [Full text]
CO2 absorption after changing the design of the absorber
Go Hirabayashi
British Journal of Anaesthesia, 28 Aug 2007 [Full text]

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