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Upper respiratory causes of exercise intolerance

W Beard1

  • 1Department of Veterinary Clinical Sciences, Ohio State University, Columbus, USA.

The Veterinary Clinics of North America. Equine Practice
|December 1, 1996
PubMed
Summary
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Respiratory issues frequently cause exercise intolerance in performance horses, leading to labored breathing and fatigue. Diagnosing upper airway obstruction often requires treadmill endoscopy, especially when resting exams are inconclusive.

Area of Science:

  • Equine Sports Medicine
  • Veterinary Respiratory Medicine
  • Equine Performance Physiology

Background:

  • Exercise intolerance is a common complaint in performance horses, often linked to respiratory dysfunction.
  • Differential diagnoses include cardiovascular disease and inadequate fitness, necessitating thorough evaluation.
  • Upper airway noise is a key clinical sign pointing towards respiratory system involvement.

Purpose of the Study:

  • To highlight the significance of the respiratory system as a cause of exercise intolerance in performance horses.
  • To outline diagnostic approaches for identifying respiratory causes of poor performance.
  • To emphasize the role of upper airway obstruction and its management.

Main Methods:

  • Clinical history from owners to identify exercise-related complaints.

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  • Physical examination, including assessment for airway noise.
  • Diagnostic endoscopy of the upper airway, both at rest and during exercise on a treadmill when indicated.

    • Main Results:

    • Respiratory system dysfunction is a primary contributor to exercise intolerance in performance horses.
    • History and upper airway endoscopy are crucial diagnostic tools.
    • Treadmill endoscopy is valuable for diagnosing lesions not apparent at rest.
    • Treatment strategies vary based on the severity of obstruction and performance demands.

    Conclusions:

    • The respiratory system is a critical factor in equine exercise intolerance.
    • Early and accurate diagnosis, often involving advanced imaging like treadmill endoscopy, is essential.
    • Tailored treatment based on diagnostic findings and performance level optimizes outcomes for affected horses.