Trimetoquinol: bronchodilator effects in horses with heaves following aerosolised and oral administration.

The research article discusses a study investigating the bronchodilator effects of trimetoquinol (TMQ) on horses suffering from heaves. The study compares the effects of TMQ when administrated orally and in aerosol form, concluding that aerosol administration is the most effective method.

Methodology of the Study

• The study used horses diagnosed with heaves, a common respiratory disease in horses, similar to asthma in humans.
• Trimetoquinol (TMQ) was administered to the horses in increasing doses, both as an aerosol and orally.
• The doses ranged from 100 to 1000 micrograms per horse for aerosolised TMQ, and 6 to 60 micrograms per kilogram of horse body weight for the oral route.
• To measure the effects of TMQ, the researchers checked for changes in the horses’ pleural pressure (deltaPplmax) and heart rate (HR).
• The researchers also observed and scored subjectively the potential side effects, such as sweating, agitation, and muscle trembling.
• In addition, they also evaluated the duration of TMQ’s action over a 6-hour period.

Results of the Study

• The results revealed a dose-dependent bronchodilation – the expansion of the bronchial air passages – in the horses when TMQ was administrated in aerosol form.
• No changes were observed in heart rate or other side effects when using the aerosol method.
• When administered in a dose of 1000 micrograms per horse via aerosol, TMQ caused an immediate bronchodilation effect lasting up to 30 minutes, followed by a second phase between 2 and 4 hours.
• However, oral TMQ was found to be therapeutically ineffective.

Conclusion of the Study

• The study concluded that administering trimetoquinol (TMQ) via aerosol is a safe and effective method of inducing bronchodilation in horses suffering from heaves, which is significant information for equine practitioners and clinicians.