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Effect of a heat and moisture exchanger on temperature and humidity of inhaled gas in isoflurane-anesthetized dogs

  • Teppei Kanda
    Correspondence
    Correspondence: Teppei Kanda, Faculty of Veterinary Medicine, Okayama University of Science, 1-3 Ikoino-oka, Imabari, Ehime, 794-8555, Japan.
    Affiliations
    Faculty of Veterinary Medicine, Okayama University of Science, Imabari, Ehime, Japan

    Department of Comparative Animal Science, College of Life Science, Kurashiki University of Science and the Arts, Kurashiki, Okayama, Japan
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  • Yutaro Oishi
    Affiliations
    Department of Comparative Animal Science, College of Life Science, Kurashiki University of Science and the Arts, Kurashiki, Okayama, Japan
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  • Ayumu Kajiyama
    Affiliations
    Department of Comparative Animal Science, College of Life Science, Kurashiki University of Science and the Arts, Kurashiki, Okayama, Japan
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  • Yuki Shimizu
    Affiliations
    Faculty of Veterinary Medicine, Okayama University of Science, Imabari, Ehime, Japan

    Department of Comparative Animal Science, College of Life Science, Kurashiki University of Science and the Arts, Kurashiki, Okayama, Japan
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  • Noritaka Maeta
    Affiliations
    Faculty of Veterinary Medicine, Okayama University of Science, Imabari, Ehime, Japan

    Department of Comparative Animal Science, College of Life Science, Kurashiki University of Science and the Arts, Kurashiki, Okayama, Japan
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  • Kayo Furumoto
    Affiliations
    Faculty of Veterinary Medicine, Okayama University of Science, Imabari, Ehime, Japan

    Department of Comparative Animal Science, College of Life Science, Kurashiki University of Science and the Arts, Kurashiki, Okayama, Japan
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  • Toshinori Furukawa
    Affiliations
    Department of Animal Pharmaceutical Science, School of Pharmaceutical Science, Kyushu University of Health and Welfare, Nobeoka, Miyazaki, Japan
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Published:February 26, 2020DOI:https://doi.org/10.1016/j.vaa.2020.02.003

      Abstract

      Objective

      To investigate the effects of a heat and moisture exchanger (HME) on the temperature and humidity of inhaled gas in isoflurane-anesthetized dogs.

      Study design

      Prospective, interventional study.

      Animals

      A total of four experimental dogs and four client-owned dogs weighing 13.9 ± 7.4 kg (mean ± standard deviation).

      Methods

      The four experimental dogs were anesthetized on two occasions with and without an intact HME at least 1 week apart. The four client-owned dogs were anesthetized once only for a surgical procedure and assigned to the HME group or no-HME group in alternate order, resulting in six dogs for each group. All dogs were premedicated, anesthetized with propofol and intubated. The HME was connected to the endotracheal tube. Anesthesia was maintained with isoflurane. A digital thermo-hygrometer was placed between the endotracheal tube and HME. The temperature and relative humidity of the inhaled gas were measured every 5 minutes for 60 minutes and the absolute humidity was calculated at each time point.

      Results

      The temperature and absolute humidity of the inhaled gas was significantly higher at 5–60 minutes after intubation in the HME group than in the no-HME group. Absolute humidity was maintained above 29 mg H2O L−1 in the HME group. No significant time-dependent effects on temperature, relative humidity or absolute humidity of the inhaled gas were observed.

      Conclusions and clinical relevance

      The temperature and absolute humidity of the inhaled gas were higher when an HME was used during isoflurane anesthesia in dogs. The use of an HME may reduce the risk of dehydration and dysfunction of the airway mucosal epithelium.

      Keywords

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