A 30-year-old woman is seen in the emergency department with concerns about palpitation that developed while she was swimming. The palpitations had been present for 1 to 2 hours and were now associated with some lightheadedness. On presentation, her physical examination was normal except for a rapid heart rate. An ECG (A) was obtained.
She was treated with intravenous metoprolol, and 10 minutes later her heart rate slowed and an ECG was repeated (B).
What is the diagnosis?
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