Ultrasonographic assessment of laryngohyoid position as a predictor of dorsal displacement of the soft palate in horses.

The researchers conducted a study to investigate if ultrasonography could accurately assess the relationship of the larynx, hyoid apparatus and the remainder of a horse’s skull to diagnose a common cause of poor performance in racehorses: dorsal displacement of the soft palate. The study found a significant relationship between the resting position of the basihyoid bone and the occurrence of this health issue during exercise.

Background

• The research is based around a common performance inhibiting condition in racehorses known as dorsal displacement of the soft palate which affects their ability to breathe during exercise.
• Current diagnostic methods for this condition require a treadmill videoendoscopy which is not widely available, hence the importance of the study in assessing an alternative method of diagnosis.

Methodology

• A sample of 56 racehorses presenting poor performance was selected for the study.
• The horses were subjected to both treadmill videoendoscopy, to confirm presence of dorsal displacement of the soft palate, and resting ultrasonography to examine the relationship between the larynx, hyoid apparatus and the remainder of the skull.
• The depth of the basihyoid bone at rest was studied to see if it bore any predictive relationship to the occurrence of the dorsal displacement of the soft palate during exercise.

Findings

• A significant connection was found between the resting position of the basihyoid bone and dorsal displacement of the soft palate in horses during exercise.
• Other measures of laryngohyoid position, however, were not associated with this condition.
• The study concluded that a more ventral location of the basihyoid bone is often present in horses affected by dorsal displacement of the soft palate.

Implications

• While the pathophysiological implications of the findings aren’t fully understood, the study confirms the effectiveness of ultrasound examination in assisting in the diagnosis of dorsal displacement of the soft palate in horses.
• This breakthrough provides an accessible and easier method for diagnosing dorsal displacement of the soft palate and potentially improving racehorse performance.