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Related Experiment Videos

Cardiovascular causes of exercise intolerance

L A Mitten1

  • 1Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Washington State University, Pullman, USA.

The Veterinary Clinics of North America. Equine Practice
|December 1, 1996
PubMed
Summary

Cardiovascular disease in horses can cause exercise intolerance, with atrial fibrillation being the most common cause. Diagnostic tools like electrocardiography and echocardiography help assess the significance of heart abnormalities in athletic horses.

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Area of Science:

  • Equine cardiology
  • Veterinary internal medicine
  • Equine sports medicine

Background:

  • Cardiovascular disease is a significant cause of exercise intolerance in horses.
  • Common causes include arrhythmias, valvular regurgitation, congenital issues, myocardial dysfunction, pericardial disease, and vascular thrombosis.
  • Atrial fibrillation is the most frequent cardiovascular contributor to exercise intolerance in horses.

Purpose of the Study:

  • To outline the cardiovascular causes of exercise intolerance in horses.
  • To highlight the diagnostic approaches for evaluating cardiac abnormalities in athletic horses.
  • To differentiate between incidental cardiovascular findings and those causing performance limitations.

Main Methods:

  • Review of existing literature on equine cardiovascular disease and exercise intolerance.

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  • Discussion of diagnostic modalities including electrocardiography (ECG) and echocardiography.
  • Analysis of the clinical significance of various cardiovascular abnormalities in athletic horses.

    • Main Results:

    • Atrial fibrillation is the most prevalent cardiovascular cause of exercise intolerance.
    • Cardiac arrhythmias and murmurs are common in athletic horses but not always linked to intolerance.
    • Diagnostic imaging and ECG are crucial for assessing the impact of cardiac abnormalities.

    Conclusions:

    • A thorough cardiovascular evaluation is essential for horses experiencing exercise intolerance.
    • Electrocardiography and echocardiography aid in determining the clinical relevance of cardiac findings.
    • Distinguishing between asymptomatic murmurs and significant pathology is key for athletic performance management.