EP: Quiz, Interpret this EKG recording

You are called to consult for irregular heart rate. A newborn who has recovered from severe sepsis was noted to have irregular heart rate on the day of discharge. Therefore, discharge was canceled and you were consulted. A PICC line was removed the day before. Baby is otherwise doing well. Here are the traces. There are no answers for these traces. Your differential diagnosis and discussion is what is expected.

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