A 45-year-old woman without any known heart disease is seen in an emergency room because of palpitations. She states that she has had palpitations for the past several years, but they are usually brief and self-terminating. She has not sought medical care. However, on this occasion the palpitations continued for several hours, at which point she sought medical care.
ECG A was obtained on presentation, and ECG B was obtained several minutes later after the palpitations resolved.
What is the diagnosis?
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