PMC6042642_01
Presenting electrocardiogram.. Notes: Six-lead electrocardiogram recording of a dog that was evaluated because of concern for ingestion of ~278 mg/kg (611.6 mg/lb) of lamotrigine. He was subsequently found to be neurologic with gastrointestinal signs. Note the multifocal ventricular tachycardia with a mean heart rate of 125 beats per minute. Paper speed =25 mm/s; 1 cm = 1 mV.
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This identified the arrhythmia as multifocal ventricular tachycardia (Figure 1).
Electrocardiogram taken on the second day of hospitalization.. Notes: Six-lead electrocardiogram recording obtained 24 h after the dog ingested ~278 mg/kg (611.6 mg/lb) of lamotrigine and was treated with intravenous fluids, lidocaine, and methocarbamol. At this time, there is a normal sinus rhythm with a mean heart rate of 114 beats per minute. Paper speed =50 mm/s; 1 cm = 1 mV.
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An electrocardiogram was also repeated and found to have normal rate and rhythm (Figure 2).