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Annals of Clinical & Laboratory Science 33:313-319 (2003)
© 2003 Association of Clinical Scientists

Novel Radiator for Carbon Dioxide Absorbents in Low-Flow Anesthesia

Go Hirabayashi, Takanori Mitsui, Takayasu Kakinuma, Yukihiko Ogihara, Shohei Matsumoto, Atsushi Isshiki and Yasuo Watanabe*
Department of Anesthesiology and* Department of Pharmacology, Tokyo Medical University, Tokyo, Japan

Address correspondence to Go Hirabayashi, M.D., Department of Anesthesiology, Tokyo Medical University, 6-7-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo 160-0023, Japan; tel 813 3342 6111, x5811; fax 813 5381 6650; e-mail go-hira{at}kk.iij4u.or.jp.

During long-term low-flow sevoflurane anesthesia, dew formation and the generation of compound A are increased in the anesthesia circuit because of elevated soda lime temperature. The object of this study was to develop a novel radiator for carbon dioxide absorbents used for long durations of low-flow sevoflurane anesthesia. Eleven female swine were divided into two groups comprising a "radiator" group (n = 5) that used a novel radiator for carbon dioxide absorbents and a "control" group (n = 6) that used a conventional canister. Anesthesia was maintained with N2O, O2, and sevoflurane, and low-flow anesthesia was performed with fresh gas flow at 0.6 L/min for 12 hr. In the "control" group, the soda lime temperature reached more than 40°C and soda lime dried up with severe dew formation in the inspiratory valve. In the "radiator" group, the temperature of soda lime stayed at 30°C, and the water content of soda lime was retained with no dew formation in the inspiratory valve. In addition, compound A concentration was reduced. In conclusion, radiation of soda lime reduced the amounts of condensation formed and the concentration of compound A in the anesthetic circuit, and allowed long term low-flow anesthesia without equipment malfunction.

Keywords: carbon dioxide absorbents, low flow anesthesia, water evaporation




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G. Hirabayashi, H. Uchino, T. Sagara, T. Kakinuma, Y. Ogihara, and N. Ishii
Effects of temperature gradient correction of carbon dioxide absorbent on carbon dioxide absorption
Br. J. Anaesth., October 1, 2006; 97(4): 571 - 575.
[Abstract] [Full Text] [PDF]


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