Exercise-induced pulmonary hemorrhage in exercising Thoroughbreds: preliminary results with pre-exercise medication.

The research paper investigates the use of various medications prior to exercise to prevent exercise-induced pulmonary hemorrhage (EIPH) in Thoroughbred horses. It found that among the assessed treatments, ipratropium was the most effective.

Objective of the Research

• The primary objective of this study was to examine the impact of various pre-exercise medications on the prevention of exercise-induced pulmonary hemorrhage (EIPH) in Thoroughbred horses known to be afflicted with the condition.

Method of Investigation

• The investigation involved administering different medications – atropine sulfate, cromolyn, ipratropium, or furosemide – to the horses before they exercised.

Findings of the Atropine Sulfate Treatment

• When atropine sulfate was given as a pre-exercise treatment, it prevented EIPH in three out of three trials in a single horse. However, it did not significantly affect the bleeding status in the other two horses.

Findings of the Cromolyn Treatment

• Cromolyn, another pre-exercise medication, did not offer significant benefits in the three horses used in this study. Hence, its effectiveness in treating EIPH was not confirmed in this study.

Findings of the Ipratropium Treatment

• Ipratropium showed promising results in preventing EIPH. It was successful in 17 out of 18 trials on two horses, suggesting that it may have beneficial effects in managing EIPH.
• Although there was no previous study on the effect of ipratropium in horses, this research posited that the bronchodilator property of the drug might be responsible for its effectiveness in preventing EIPH.

Findings of Furosemide Treatment

• Furosemide, despite being administered in various dosages and at different time intervals before the exercise, failed to prevent EIPH in any of the three horses. This indicates that furosemide may not be effective in EIPH prevention in Thoroughbred horses.