A new method for measuring respiration in the conscious mouse

Area of Science:

• Physiology
• Pharmacology
• Biomedical Engineering

Background:

• Accurate measurement of respiratory changes in conscious small animals is crucial for pharmacological and physiological studies.
• Existing methods may lack sensitivity or require invasive procedures.

Purpose of the Study:

• To describe a novel, highly sensitive apparatus and method for measuring respiratory changes in conscious mice and rats.
• To demonstrate the apparatus's capability in detecting drug-induced respiratory alterations.

Main Methods:

• Construction of a three-part apparatus using readily available components: housing capsule with a respiratory-sensitive element, air supply, and data recording.
• Encapsulation of conscious mice/rats within the housing capsule.
• Detection of respiratory changes via pressure variations on the sensitive element.

Main Results:

• The apparatus accurately detected rapid increases and decreases in respiratory rates.
• Changes were recorded following intravenous administration of respiratory depressants (morphine, arachidonate) and a stimulant (dimorpholamine).
• Exceptional accuracy was achieved in recording these physiological responses.

Conclusions:

• The described apparatus provides a sensitive and accurate method for monitoring respiratory dynamics in conscious rodents.
• This tool facilitates the study of respiratory effects of various agents in preclinical research.