18-Year-Old Asymptomatic Collegiate Distance Runner With T-wave Inversions

An 18-year-old Caucasian female collegiate distance runner was referred to sports cardiology after an "abnormal family history" was obtained during her pre-participation screening exam. She had no significant past medical or surgical history and her only medication was oral contraceptive pills. She reported a family history of "sudden cardiac death" of her paternal grandfather at the age of 48, but was unclear of the actual details surrounding this event. On exam, she weighed 57kg, blood pressure was 103/66 mm Hg and her cardiovascular exam was normal.

12-lead ECG:

12-lead ECG

Which of the following is an appropriate next step in her evaluation?

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