A 67-year-old man with a previous anterior myocardial infarction develops palpitations while being monitored in hospital. He is alert, has a blood pressure of 118/76 mmHg and a regular pulse of 174 beats per minute. The ECG shows a broad-complex rhythm with atrioventricular dissociation, occasional capture beats and a uniform QRS morphology. Which one of the following is the most appropriate treatment?
Keep going — a set of ten like this one, one at a time.
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