Diagnostic approach to exercise intolerance in racehorses

Area of Science:

• Equine Sports Medicine
• Veterinary Diagnostics

Background:

• Exercise intolerance is a common issue in racehorses, impacting performance and career longevity.
• A structured diagnostic process is crucial for identifying the underlying causes of decreased performance.

Purpose of the Study:

• To outline a logical, time-efficient diagnostic strategy for evaluating exercise intolerant racehorses.
• To emphasize the importance of fundamental clinical assessment before advanced diagnostics.

Main Methods:

• Detailed clinical history collection from trainers/owners, covering racing ability and past health issues.
• Comprehensive physical examination, focusing on musculoskeletal, respiratory, cardiovascular, and neurological systems.
• Systematic diagnostic steps including upper airway endoscopy, lameness evaluation, and potential exercise trials.

Main Results:

• A step-by-step approach ensures all major body systems are assessed systematically.
• Prioritizing history and physical examination aids in efficient diagnosis.
• Advanced diagnostics like serum chemistry, bronchoalveolar lavage, and imaging are best utilized after initial assessment.

Conclusions:

• A methodical diagnostic process, starting with history and physical exam, is essential for exercise intolerant horses.
• Referral decisions should be made after exhausting initial diagnostic capabilities.
• This approach optimizes the identification of causes for exercise intolerance in racing Thoroughbreds.