• 1. van Loon G. Cardiac arrhythmias in horses. Vet Clin North Am Equine Pract 2019;35:85102.

  • 2. Reef BV, Marr CM. Dysrhythmias: assessment and medical management. In: Marr C, Bowen M, eds. Cardiology of the horse. 2nd ed. St Louis: Elsevier Health Sciences, 2010;159178.

    • Search Google Scholar
    • Export Citation
  • 3. Verheyen T, Decloedt A, De Clercq D, et al. Electrocardiography in horses, part 2: how to read the equine ECG. Vlaams Diergen Tijds 2010;79:337344.

    • Search Google Scholar
    • Export Citation
  • 4. Zahid M, Arora S. Reverse Wenckebach “pseudo-supernormal” conduction or paroxysmal atrioventricular block. J Cardiovasc Dis Res 2012;3:225227.

    • Search Google Scholar
    • Export Citation
  • 5. Giles LR, Strapps K, Potter SJ, et al. Reverse Wenckebach. Heart Lung 2004;33:6566.

  • 6. Mond HG, Vohra J. The electrocardiographic footprints of Wenckebach block. Heart Lung Circ 2017;26:12521266.

  • 7. Durando MM. Cardiovascular causes of poor performance and exercise intolerance and assessment of safety in the equine athlete. Vet Clin North Am Equine Pract 2019;35:175190.

    • Search Google Scholar
    • Export Citation

Advertisement

ECG of the Month

View More View Less
  • 1 1Department of Clinical Sciences, College of Veterinary Medicine, Auburn University, Auburn, AL 36849.
  • | 2 2Department of Clinical Sciences, College of Veterinary Medicine, Ohio State University, Columbus, OH 43210.

A 17-year-old 513-kg (1,129-lb) gray Holsteiner gelding was presented for evaluation of lethargy of indeterminate duration. On examination, the horse was markedly lethargic with dull attitude and exercise intolerance when walking. It was thin (body condition score, 3/9). Mucous membranes were pink and moist with a capillary refill time < 2 seconds. Heart rate was 28 beats/min, respiratory rate was 20 breaths/min, and rectal temperature was 37.6°C (99.8°F). Cardiac auscultation revealed a grade 3/6 left-sided, apical, systolic murmur as well as an irregularly irregular arrhythmia. Frequent pauses with presumptive S4 heart sounds were auscultated. Gastrointestinal sounds and digital pulses were

Contributor Notes

Address correspondence to Dr. Groover (esg0001@auburn.edu).