Alleviation of postanesthetic hypoxemia in the horse.

This research sought to understand the impact of nasotracheal oxygen insufflation, with a flow rate of 15 L/min, on the arterial oxygen partial pressure during post-anesthesia recovery in horses.

Study Design

• The study was designed to examine how the insufflation of oxygen, at a 15 L/min flow rate, into a horse’s nasotrachea affects the partial pressure of oxygen in arterial blood during the recovery period following inhalation anesthesia.
• This flow rate was identified as a potential solution to prevent postoperative hypoxemia, even though there wasn’t sufficient experimental evidence to corroborate this claim.

Research Methodology

• Horses used in a healing of cartilage study were selected to be part of the experiment. They were anesthetized twice.
• In the first scenario, the horses were allowed to recover from anesthesia by breathing room air.
• For the second scenario, oxygen was insufflated into the trachea of the horses at a rate of 15 L/min during the recovery period.
• The experiment was structured to ensure that each horse acted as its own control. This means the outcomes of the oxygen insufflation during recovery were measured against the recovery where the horses just inhaled room air.

Statistical Analysis & Results

• The data gathered during the experiment underwent statistical analysis using the Student’s t-test for paired samples.
• This analysis showed a significant increase in the arterial partial pressure of oxygen in the horses that were insufflated with oxygen during the recovery period, in comparing with the horses that weren’t (p-value < 0.05).

Conclusions

• The research provides experimental evidence to support the claim that nasotracheal insufflation of oxygen at a flow rate of 15 L/min can prevent postoperative hypoxemia in horses.
• As a result, the use of oxygen insufflation at this flow rate could be adopted in veterinary practice to ensure a safer recovery from inhalation anesthesia.