A 25-year-old man who is active playing tennis, soccer, and basketball is seen in the emergency department with a several-hour history of palpitations. He states that he has had these symptoms in the past and they have resolved spontaneously. He has seen a cardiologist in the past, but no diagnosis has been made. As a result of the prolonged nature of the palpitations, he sought medical care. ECG A is obtained shortly after he arrives at the emergency department.
After the patient is seen by the physician, there is a planned intervention, but before the intervention is performed, another ECG is obtained (ECG B).
What is the diagnosis?
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