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Sudden death in training and racing Thoroughbred horses
Journal of the American Veterinary Medical Association
|December 15, 1985
Summary
Sudden death in young Thoroughbred racehorses is often unexplained. Exercise-induced cardiovascular failure is a potential cause for these racing fatalities.
Area of Science:
- Equine Sports Medicine
- Veterinary Pathology
Background:
- Sudden death in Thoroughbred racehorses presents a significant challenge in equine sports medicine.
- Young horses (2-5 years) are particularly affected, with increased incidence during warmer months.
Purpose of the Study:
- To investigate the causes of sudden death in Thoroughbred racehorses.
- To identify potential underlying pathologies or contributing factors.
Main Methods:
- Review of case records, necropsy reports, and histologic sections from 25 Thoroughbred racehorses.
- Analysis of age, sex, seasonality, and circumstances of death (racing/training).
Main Results:
- Only 32% of horses had definitive lesions explaining death; 68% remained undetermined.
- Massive hemorrhage was the cause in 6 of 8 horses with identifiable lesions.
- Pulmonary edema, congestion, and hemorrhage were common findings across all cases.
Conclusions:
- A significant proportion of sudden deaths in racehorses lack identifiable causes.
- Exercise-induced acute cardiovascular failure is postulated as a likely cause for unexplained fatalities.
- Further research into subclinical cardiovascular defects is warranted.