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You are the first doctor to reach a 68-year-old man found slumped in a chair in the day therapy unit. He does not respond to voice or to a firm shake, he makes an occasional gasp, and you cannot feel a carotid pulse over ten seconds. The nurse has applied the defibrillator pads; the monitor shows a clean trace of regular narrow complexes at 40 per minute. She points at it and says he still has a rhythm. Which one of the following should be done first?
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Keep going — a set of ten like this one, one at a time.

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