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ECG of the Month

Reid K. Nakamura DVM, DACVECC1 and Danielle L. Yuhas DVM, DACVIM2
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  • 1 Advanced Veterinary Care Center, 15926 Hawthorne Blvd, Lawndale, CA 90260.
  • | 2 Advanced Veterinary Care Center, 15926 Hawthorne Blvd, Lawndale, CA 90260.

A 12-year-old 1.90-kg (4.18-lb) castrated male Chihuahua was evaluated because of progressive lethargy and increased respiratory effort during the preceding 3 to 4 weeks. The dog had no history of episodes of collapse or prior medical problems. The dog had been eating and drinking apparently normally. Cardiac auscultation revealed a grade 3/6 left apical systolic heart murmur and a heart rate of 30 beats/min. Electrocardiography was performed, and findings were consistent with third-degree atrioventricular (AV) block (data not shown). On the basis of thoracic radiographic findings, the dog was initially suspected to have left-sided congestive heart failure. The dog was

Contributor Notes

Address correspondence to Dr. Nakamura (r.kiyoshi.nakamura@gmail.com).