Merck Manual

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ECG, malignant ventricular tachycardia, Boxer
ecg-malignant-ventricular-tachycardia-boxer-kittleson-sized
ECG, malignant ventricular tachycardia, Boxer

    In this ECG of a Boxer, the first 24 complexes are a fast ventricular tachycardia (320 bpm). When the ventricular tachycardia terminates, the dog goes into either a sinus tachycardia or a supraventricular tachycardia (7 complexes) and then a sinus rhythm with ventricular bigeminy (every other complex is a PVC).

Courtesy of Dr. Mark D. Kittleson.