Effect of sodium cromoglycate on light racehorses with elevated metachromatic cell numbers on bronchoalveolar lavage and reduced exercise tolerance.

The research study focuses on the effects of sodium cromoglycate on young racehorses suffering from small airway disease, characterized by elevated metachromatic cell numbers and reduced exercise tolerance, with positive results showing improvement of respiratory symptoms and stabilization of cell histamine content.

Research Objectives

• The primary aim of this research was to examine the effect of sodium cromoglycate on horses showing signs of small airway disease. This includes increased metachromatic cells in bronchoalveolar lavage (a technique of obtaining a lung sample) and difficulties in breathing during exercise.
• The researchers also aimed to study how this treatment impacts bronchoalveolar lavage cytology (cell analysis) and histamine parameters, which are potential indicators of inflammation or allergic reactions.

Methodology

• The study was conducted on twelve racehorses, aged approximately 3.4 years, with a history of respiratory issues during exercise, signs of obstructive airway disease, and a greater than 2% metachromatic cell differential in bronchoalveolar lavage.
• The horses were randomly assigned to either a treatment group receiving 200 mg of nebulized sodium cromoglycate or a control group receiving a saline placebo. The treatment or placebo was administered twice daily for a week.
• Each horse’s clinical respiratory status was scored and bronchoalveolar lavage was performed on each animal on days 0 and 7. They measures parameters from the bronchoalveolar lavage fluid like cell concentration, differential cell percentage, histamine concentration, and metachromatic cell histamine content.

Results and Findings

• The researchers found that horses treated with sodium cromoglycate showed an improvement in their respiratory symptoms (P = 0.01) and a stabilization of metachromatic cell histamine content (P = 0.04).
• This result indicates that sodium cromoglycate may be an effective treatment for small airway diseases in young racehorses.

Conclusion

• From their findings, the researchers concluded that sodium cromoglycate effectively treats small airway ailments in young racehorses. However, they also underlined the need for further research into the pharmacodynamics of this drug in horses to clarify its mode of action and potential side effects.