Cardiac Arrest Following Exercise: A Prototypical Presentation of LQT1

A young female patient presents to establish care in a cardiology clinic for further evaluation after surviving an out-of-hospital arrest. The patient began to experience fainting episodes at the age of seven and suffered an out-of-hospital cardiac arrest at the age of 12 while playing volleyball. A transthoracic echocardiogram demonstrated a structurally normal heart. Stress testing and coronary angiography were not performed. She has no other significant past medical history and is on no medications. The patient’s family history is notable for two distant relatives, nieces of her maternal-paternal great grandfather (her maternal grandmother's father), who died suddenly at young ages. The electrocardiogram (ECG) (Figure 1) was obtained from the patient.

Figure 1: Presenting ECG

Searching for the Cause of HFpEF in Older Adults | Patient Case Quiz - Figure 1

Given the clinical history and characteristic findings in the ECG, which of the following is the next best step for this patient?

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