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Animal Bioresource in Japan

.: Home > Animal Bioresource in Japan > 2015 > Volume 64 Number 1 > Atsushi TSUKAMOTO, Kazuya SERIZAWA, Reiichiro SATO, Jumpei YAMAZAKI, Tomo INOMATA

Vital signs monitoring during injectable and inhalant anesthesia in mice

1)Laboratory of Laboratory Animal Science, Azabu University, School of Veterinary Medicine, 1-17-71 Fuchinobe, Chuou-ku, Sagamihara, Kanagawa 252-5201, Japan 2)Laboratory of Veterinary Internal Medicine 3, Azabu University, School of Veterinary Medicine, Japan 3)Laboratory of Molecular Medicine, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo 060-0818, Japan
Abstract :

Selecting the appropriate anesthetic protocol for the individual animal is an essential part of laboratory animal experimentation. The present study compared the characteristics of four anesthetic protocols in mice, focusing on the vital signs. Thirty-two male ddY mice were divided into four groups and administered anesthesia as follows: pentobarbital sodium monoanaesthesia; ketamine and xylazine combined (K/X); medetomidine, midazolam, and butorphanol combined (M/M/B); and isoflurane. In each group, rectal temperature, heart rate, respiratory rate, and O2 saturation (SPO2) were measured, and the changes over time and instability in these signs were compared. The anesthetic depth was also evaluated in each mouse, and the percentage of mice achieving surgical anesthesia was calculated. K/X anesthesia caused remarkable bradycardia, while the respiratory rate and SPO2 were higher than with the others, suggesting a relatively strong cardiac influence and less respiratory depression. The M/M/B group showed a relatively lower heart rate and SPO2, but these abnormalities were rapidly reversed by atipamezole administration. The pentobarbital group showed a lower SPO2, and 62.5% of mice did not reach a surgical anesthetic depth. The isoflurane group showed a marked decrease in respiratory rate compared with the injectable anesthetic groups. However, it had the most stable SPO2 among the groups, suggesting a higher tidal volume. The isoflurane group also showed the highest heart rate during anesthesia. In conclusion, the present study showed the cardiorespiratory characteristics of various anesthetic protocols, providing basic information for selecting an appropriate anesthetic for individual animals during experimentation.

Keywords :
isoflurane, ketamine, M/M/B (medetomidine, midazolam, and butorphanol combined), pentobarbital, rodent

Date Deposited : 08 Apr 2015 09:42

Last Modified : 08 Apr 2015 09:42

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Volume 64, Number 1, - 2015

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