21-Year-Old Male With Transient Abnormal ECG

A 21-year-old white male presented to the emergency department after ingesting excessive alcohol in combination with bupropion, which he takes for depression. He is a recreational athlete. He has no other medical problems and is unable to provide a family history. He denied any history of palpitations or syncope. An ECG was obtained on admission:

Figure 1

Another ECG was obtained 12 hours later:

Figure 2

Which of the following is the correct diagnosis?

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