Feasibility of Echocardiographic Estimation of Pulmonary Artery Stiffness in Horses.

This research study focuses on the potential application of a method, previously used in humans, to evaluate the stiffness of the pulmonary artery in horses. The study then proceeds to determine the feasibility of this method by testing it on 15 healthy horses, and the results suggest the method may be consistently applicable on horses.

Background

• The research revolves around Pulmonary Artery Stiffness (PAS), an index generally used in humans to evaluate the elasticity of the pulmonary artery which could aid in early detection of certain heart and pulmonary conditions.
• PAS is particularly useful in tracking changes in the vessel wall caused by chronic pulmonary and congenital heart diseases, changes which also occur in horses suffering from chronic respiratory diseases.
• Despite the apparent usefulness of PAS, there has been little research regarding the application on horses.

Objective of the Study

• The study aims to evaluate the feasibility of using PAS as a useful echocardiographic parameter in horses, a topic not widely addressed in literature.

Methodology

• In this prospective study, a select sample of 15 healthy horses were administered tests to calculate their PAS levels.
• Two key components, maximal frequency shift and acceleration time, were measured from the pulmonary artery flow. This was done using a pulsed-wave Doppler trace, obtained from the right parasternal short-axis view at the level of the pulmonary artery.
• PAS was then calculated as the ratio of maximal frequency shift to acceleration time.

Findings and Conclusion

• The study concluded that the variability of PAS in horses, including intra- and inter-observer variability, day-to-day variability, and image acquisition variability, was relatively low.
• This implies that PAS can be consistently measured in horses, suggesting the method investigated in the study is feasible.
• The authors of the study suggest that further research could be useful to assess the clinical usefulness of PAS in unhealthy horses, particularly those affected by chronic respiratory diseases.