A 21-year-old, white, professional marathon runner underwent cardiovascular assessment as a part of routine screening. He had no family history of cardiac disease or sudden cardiac deaths (SCD), and no abnormalities during a physical examination were found. Laboratory studies demonstrated normal levels of electrolytes, complete blood counts and negative cardiac necrosis markers. The transthoracic echocardiography was normal. A resting 12-leads electrocardiogram (ECG) demonstrated sinus rhythm with a rate of 62 beats per minute, a moderate concave ST-segment elevation