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Implantation of a dual-chamber, rate-adaptive pacemaker in a horse with suspected sick sinus syndrome
  1. G. van Loon, DVM, PhD1,
  2. H. Rottiers, DVM1,
  3. P. Deprez, DVM, PhD1,
  4. W. Fonteyne, MD2 and
  5. R. Tavernier, MD, PhD2
  1. 1 Department of Large Animal Internal Medicine, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, B-9820 Merelbeke, Belgium
  2. 2 Department of Cardiology, University Hospital, Ghent University, De Pintelaan 185, B-9000 Ghent, Belgium


A five-year-old gelding suffered syncope at the end of a period of exercise. A 24-hour electrocardiogram recording revealed intermittent pauses in the sinus rhythm of up to 10 seconds, indicating sinus node disease; the pauses occurred repeatedly, particularly after exercise. A dual-chamber, rate-adaptive pacemaker was successfully implanted, which prevented excessive postexercise bradycardia and syncope, and allowed the horse to return to work.

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