Abstract:A 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… Show more
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