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ECG of the Month

Sarah E. Achen DVM1, Ashley B. Saunders DVM, DACVIM2, and Matthew W. Miller DVM, DACVIM3
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  • 1 Department of Small Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843-4474.
  • | 2 Department of Small Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843-4474.
  • | 3 Department of Small Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843-4474.

10-year-old 20-kg (44-lb) spayed female Brittany was examined by a veterinarian because of acute onset of lethargy and inappetence. Tachycardia was detected on physical examination and confirmed via ECG; in all leads, the QRS complexes were wide. Lidocaine hydrochloride (2 mg/kg [0.9 mg/lb]) was administered IV, which slowed the heart rate slightly. The dog was subsequently transferred to a local emergency clinic for supervision overnight. Because of the incomplete response to lidocaine, the dog was referred to the Veterinary Medical Teaching Hospital at Texas A&M University for further evaluation the following morning.

The dog was bright and alert at the

10-year-old 20-kg (44-lb) spayed female Brittany was examined by a veterinarian because of acute onset of lethargy and inappetence. Tachycardia was detected on physical examination and confirmed via ECG; in all leads, the QRS complexes were wide. Lidocaine hydrochloride (2 mg/kg [0.9 mg/lb]) was administered IV, which slowed the heart rate slightly. The dog was subsequently transferred to a local emergency clinic for supervision overnight. Because of the incomplete response to lidocaine, the dog was referred to the Veterinary Medical Teaching Hospital at Texas A&M University for further evaluation the following morning.

The dog was bright and alert at the

Contributor Notes

Address correspondence to Dr. Saunders.