Patient data: 54-year old man who recently underwent a major cardiac procedure. At first glance, this ECG may not appear to be particularly unique but a closer inspection reveals something unusual going on here.
HINT: The telling clue can be found in lead II but you'll have to use calipers and think "outside-the-box". 3 days after this ECG, the patient reverted back to sinus rhythm but continued to display this one finding. Good luck!
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