Which anesthesia modalities are commonly used for mouse procedures and what monitoring is essential?

• A. Only ether inhalation; monitor temperature only.
• B. Sedation with mild caffeine; no monitoring required.
• C. Inhalant anesthesia (isoflurane) or injectable anesthetics; monitor respiration, reflexes, and depth of anesthesia; maintain airway.
• D. No anesthesia needed for minor procedures.

Answer: (C)

For mouse procedures, using anesthesia that you can control and quickly adjust is essential, which is why inhalant anesthesia like isoflurane or injectable anesthetics are used. Isoflurane allows precise control of depth and rapid recovery, while injectable options provide alternatives when inhalation isn’t feasible. The key is to monitor the animal closely during the procedure to ensure it remains unconscious and pain-free, but not overly depressed.

Essential monitoring includes watching respiration to detect adequate breathing and any signs of respiratory depression, assessing reflexes and depth of anesthesia to know whether the mouse is still unresponsive or approaching too deep, and maintaining the airway to ensure unobstructed ventilation. These elements help prevent under- or over-anesthesia and support safer, humane outcomes.

Other options are not appropriate: ether inhalation is outdated and risky; sedation with an irrelevant substance isn’t appropriate for surgical or invasive procedures; and proceeding without anesthesia or monitoring would be unsafe and unethical.