A 76-year-old man with a history of hypertension and diabetes mellitus presents to an ophthalmology clinic for an evaluation before cataract surgery. Shortly after arriving, he complains of light headedness, his pulse is noted to be very rapid, and his blood pressure is 80/50 mm Hg. He is brought urgently to the emergency room, where an ECG is obtained (ECG A).
He denies previous cardiac disease, although he states that over the past 2 months he has had similar episodes of episodic lightheadedness. As a result of the rapid tachycardia, he is urgently cardioverted, and after the rhythm is reverted, another ECG is obtained (ECG B).
What is the diagnosis?
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