Cited by 156Veterinary Pharmacology and AnesthesiaAnimal Behavior and Welfare StudiesAnimal testing and alternatives

Severity classification of repeated isoflurane anesthesia in C57BL/6JRj mice-assessing the degree of distress

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Hohlbaum, Katharina, Bert, Bettina, Dietze, Silke, Palme, Rupert, Fink, Heidrun, Thöne-Reineke, Christa·2017·PLoS ONE

Abstract

According to the EU Directive 2010/63, the severity of a procedure has to be classified as mild, moderate or severe. General anesthesia is thought to be mild, but the Directive does not differentiate between single and repeated anesthesia. Therefore, we investigated the impact of repeated administration of isoflurane, the most commonly used inhalation anesthetic, on the well-being of adult C57BL/6JRj mice, in comparison to single administrations and to untreated animals, when applied six times for 45 min at an interval of 3-4 days. For the animals anesthetized, excitations, phases of anesthesia, and vital parameters were monitored. Well-being after anesthesia was assessed using a behavioral test battery including luxury behavior like burrowing and nest building behavior, the Mouse Grimace Scale (MGS), the free exploratory paradigm for anxiety-related behavior, home cage activity and the rotarod test for activity, as well as food intake and body weight. Additionally, hair corticosterone and fecal corticosterone metabolites were measured. Our results show that nest building behavior, home cage activity, body weight, and corticosterone concentrations were not influenced by anesthesia, whereas changes in burrowing behavior, the MGS, food intake, and the free exploratory behavior indicated that the well-being of the mice was more affected by repeated than single isoflurane anesthesia. This effect depended on the sex of the animals, with female mice being more susceptible than male mice. However, repeated isoflurane anesthesia caused only short-term mild distress and impairment of well-being, mainly in the immediate postanesthetic period. Well-being stabilized at 8 days after the last anesthesia, at the latest. Therefore, we conclude that when using our anesthesia protocol, the severity of both single and repeated isoflurane anesthesia in C57BL/6JRj mice can be classified as mild. However, within the mild severity category, repeated isoflurane anesthesia ranks higher than single isoflurane anesthesia. Additionally, our results imply that male and female mice can differently perceive the severity of a procedure.

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  • Mice repeatedly exposed to 4% isoflurane for 45 min at 3-4 d intervals for 3 weeks did not display significant differences in nest building behavior, home cage activity, body weight, or corticosterone concentrations compared with control mice.

    “On the other hand, mice repeatedly exposed to 4% isoflurane for 45 min at 3–4 d intervals for 3 weeks did not display significant differences in terms of nest building behavior, home cage activity, body weight, or corticosterone concentrations when compared with control mice (Hohlbaum et al., 2017).”

    From Microtubule-stabilizer epothilone B delays anesthetic-induced unconsciousness in rats (2024) · cites this paper as Hohlbaum et al., 2017

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Research works printed but not linked: 2

  1. [12]2010 EU. Directive 2010/63/EU. Official Journal of the European Union. 2010;L276/33-L276/29.
  2. [67]Kita M, Watanabe T, Suzuki T, Sato I, Hossain M, Kobayashi H. Effects of repeated administration of inhaled anesthetics on anesthesia, brain acetylcholinesterase, muscarinic receptors and dopaminergic receptors in mice. Adv Biomed Eng Res. 2013; 1: 24– 32.

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Authors
Hohlbaum, K., Bert, B., Dietze, S., Palme, R., Fink, H., & Thöne-Reineke, C.
Affiliations
  • Freie Universität Berlin (DE)
  • University of Veterinary Medicine Vienna (AT)
Corresponding author
Hohlbaum, Katharina
Venue
PLoS ONE
Published
2017-06-15
Volume
12
Issue
6
Pages
e0179588
ISSN
1932-6203 (ISSN-L)
OpenAlex
W2625702801
Cited by
156
References
73
Citations by year
2026: 12 · 2025: 12 · 2024: 20 · 2023: 19 · 2022: 19 · 2021: 13 · 2020: 28 · 2019: 21 · 2018: 11 · 2017: 1
FWCI
26.28
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Refubium (Universitätsbibliothek der Freien Universität Berlin) (submittedVersion, cc-by)
  • OpenAgrar (submittedVersion, cc-by)
  • Universitätsbibliothek der FU Berlin Hochschulschriftenstelle u. Dokumentenserver (cc-by)
Funders
German Federal Ministry of Education and Research (031A262A)
Topics
  • Health Sciences › Veterinary › Small Animals › Veterinary Pharmacology and Anesthesia
  • Health Sciences › Veterinary › Small Animals › Animal Behavior and Welfare Studies
  • Health Sciences › Veterinary › Small Animals › Animal testing and alternatives
Keywords
animal welfare, Mouse Grimace Scale, corticosterone, sex differences, nest building behavior, burrowing behavior, anxiety-like behavior, anesthesia recovery
MeSH terms
Anesthesia, Inhalation, Animals, Corticosterone, Eating, Female, Isoflurane, Male, Nesting Behavior, Sex Characteristics, Stress, Psychological, Time Factors, Mice

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