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Dynamic pharyngeal collapse in racehorses.

A G Boyle1, B B Martin, E J Davidson

  • 1Department of Clinical Studies, New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, 382 W Street Road, Kennett Square, Pennsylvania 19348, USA.

Equine Veterinary Journal. Supplement
|April 4, 2007
PubMed
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Dynamic pharyngeal collapse (PC) in racehorses significantly impacts earnings, especially in older horses and those with grade 3 PC. This condition often leads to decreased oxygenation, affecting athletic performance and career longevity.

Area of Science:

  • Equine Sports Medicine
  • Veterinary Internal Medicine
  • Equine Surgery

Background:

  • Dynamic pharyngeal collapse (PC) is a significant cause of career-ending performance issues in racehorses.
  • Understanding the severity and impact of PC is crucial for prognosis and management.

Purpose of the Study:

  • To develop a grading system for dynamic pharyngeal collapse (PC) in racehorses.
  • To evaluate the effect of PC on athletic performance and earnings.
  • To analyze physiological parameters in horses with PC.

Main Methods:

  • Retrospective review of 828 equine medical records, identifying 49 cases of PC.
  • Grading of PC severity (0-4) and upper airway obstruction using video-endoscopy during exercise.
  • Comparison of pre- and post-diagnosis earnings per race and performance index (PI).

Related Experiment Videos

  • Analysis of exercising arterial blood gases (PaO2, PaCO2).

    • Main Results:

    • Thoroughbreds (80%) and Standardbreds (20%) were affected, with 73% having a history of upper respiratory noise.
    • PC grading revealed a high prevalence of moderate to severe collapse (grades 3 and 4 in 73% of cases).
    • Significant decreases in earnings per race were observed in horses aged ≥4 years and those with grade 3 PC; PI showed no significant change.
    • Abnormal blood gas values (decreased PaO2, elevated PaCO2) were noted in a subset of horses.

    Conclusions:

    • A classification system for dynamic pharyngeal collapse was established.
    • Older racehorses (≥4 years) and those with grade 3 PC have a guarded prognosis for returning to previous performance levels.
    • PC is associated with impaired arterial oxygenation, impacting race performance and earnings.