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ECG of the Month

Maggie C. Machen BS1, Amara H. Estrada DVM, DACVIM2, and Robert Prošek DVM, DACVIM3
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  • 1 Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610-0126.
  • | 2 Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610-0126.
  • | 3 Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610-0126.

A 13-year-old 20-kg (44-lb) castrated male English Springer Spaniel was evaluated at the University of Florida Veterinary Medical Center for transvenous pacemaker implantation because of third-degree atrioventricular (AV) block. The AV block was initially diagnosed several months prior to this evaluation, and no treatment had been initiated. One month prior to evaluation, the dog was treated for congestive heart failure, which prompted referral for further treatment and pacemaker implantation. At the time of the evaluation, the dog was receiving furosemide (2 mg/kg [0.91 mg/lb], PO, q 12 h) and enalapril (0.5 mg/kg [0.23 mg/lb], PO, q 12 h). On initial

Contributor Notes

Address correspondence to Dr. Estrada.