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Evaluation of Isoflurane Overdose for Euthanasia of Neonatal Mice. | LitMetric

Evaluation of Isoflurane Overdose for Euthanasia of Neonatal Mice.

J Am Assoc Lab Anim Sci

Department of Comparative Medicine, Stanford University School of Medicine, Stanford, California, USA.

Published: February 2017

AI Article Synopsis

Article Abstract

Neonatal mice (that is, pups younger than 6 d) must be exposed to CO2 for as long as 50 min to achieve euthanasia. Alternatively, other inhalant anesthetic agents have been used to euthanize laboratory rodent species. We investigated the efficacy of isoflurane at saturated vapor pressure to euthanize neonatal mice. Neonatal mice (n = 76; age, 1 or 2 d) were exposed to isoflurane in a sealed, quart-size (0.95-L) plastic bag at room temperature. Righting and withdrawal reflexes were absent in less than 2 min. After 30 min of exposure to isoflurane, pups were removed and monitored for recovery. All pups were cyanotic and showed no detectable signs of life when they were removed from the bag. However, after 30 to 120 min after removal from the bag, 24% of isoflurane-overexposed pups began gasping and then resumed normal respiration and regained a normal pink coloration. These results demonstrate that isoflurane overexposure at saturated vapor pressure for 30 min is insufficient to euthanize neonatal mice and that isoflurane overexposure must be followed by a secondary means of euthanasia.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4865695PMC

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