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Electrocardiogram (ECG) from a 7.5‐year‐old Cavalier King Charles Spaniel with advanced myxomatous mitral valve disease. The ECG strip shows 75 seconds of a single precordial lead from the 24‐hour Holter recording displayed chronologically and centered around a syncopal episode. The ECG is showing sinus rhythm with HR 146 bpm, followed by a decrease in HR and sinus pauses. Hereafter, the dog has sinus arrest followed by an escape rhythm. bpm, beats per minute; HR, heart rate.
