Determination of the minimum alveolar concentration (MAC) and physical response to sevoflurane inhalation in horses.

The paper investigates the amount of sevoflurane (a type of anesthetic) required to keep horses still during dental procedures and their physical reactions to this anesthetic. The results show that sevoflurane might be a useful anesthetic for horses.

Determination of Minimum Alveolar Concentration

The research revolves around determining the minimum amount of sevoflurane, known as the minimum alveolar concentration or (MAC), necessary to keep horses from moving in response to electrical stimulation to the oral mucous membranes. This test is conducted to:

• Understand the efficiency of sevoflurane in curtailing any significant, intentional movements of the horse during medical interventions.
• Establish a baseline MAC for use in future studies or practical applications.

The researchers concluded that the MAC of sevoflurane in horses is 2.31 +/- 0.11%, meaning that’s the minimum concentration required to keep a horse effectively anesthetized.

Physical Responses to Sevoflurane Inhalation

The study also observed how horses physically respond to sevoflurane. Key findings were:

• Horses were found to demonstrate good ventilation, without any signs of airway irritation like coughing. This suggests that sevoflurane may not pose significant respiratory threats or discomfort during its administration.
• There was a slight excitement in horses before they became reclined, suggesting an initial response to the sevoflurane.

Usefulness of Sevoflurane

From the established MAC and the observed physical responses, the research concludes that sevoflurane could be a clinically beneficial anesthetic for use in horses. The end tidal sevoflurane concentration (ESC), essentially the amount of sevoflurane at the end of an exhalation, that brought about recumbency was 2.54 +/- 0.11%. The ability of sevoflurane to cause recumbency at this concentration (indicating effective anesthesia) coupled with its observed minimal airway irritation points towards its potential usability and effectiveness as an anesthetic agent in horses.