Preliminary studies on the measurement of conjunctival oxygen tension in the foal.

The study examines the effectiveness of a transconjunctival oxygen monitoring system in monitoring arterial oxygenation levels in young horses and ponies. The research found that the system could accurately and reliably indicate oxygenation levels, though adjustments may be needed for awake and mobile subjects.

Objective

• The main aim of the research was to investigate the potential use of a transconjunctival oxygen monitoring system to accurately and reliably observe arterial oxygenation trends in horse and pony foals between 5 and 20 days old.

Methodology

• A total of 12 foals were involved in the study. Ten of these foals were anesthetized with isoflurane in oxygen and nitrous oxide, while the remaining two were kept conscious.
• The researchers manipulated the concentration of the inspired oxygen by varying the proportions of oxygen and nitrous oxide supplied to the breathing circuit.

Findings

• The foals displayed significant positive correlations between arterial and conjunctival oxygen tensions. This was seen across a range of arterial oxygen tension values, from less than 20 to greater than 400 mm of Hg.
• The study found that the transconjunctival oxygen monitoring system seemed accurate and reliable in measuring oxygenation levels in the foals. This result held true irrespective of whether the foals were anesthetized or conscious.

Implications

• Although the transconjunctival oxygen monitoring system was found to be effective, the study suggested that modifications would be required for its use in awake and mobile foals. Specifically, the researchers recommended the use of a ring conformer made to fit the foal’s eye.
• The findings are significant as they suggest a potential new method for non-invasive monitoring of oxygenation levels in foals. This could have wider applications in the field of veterinary medicine, particularly in monitoring and treatment of conditions affecting blood oxygen levels.