Young Football Player with Sudden Chest Pain

Case
A 20-year-old previously healthy man presents with sudden onset of substernal chest pressure after completing football practice. His chest pain is nonradiating, nonreproducible, and nonpositional. He does not have associated palpitations, dyspnea, or diaphoresis. He reports that he has not had recent upper respiratory tract infections or contact with ill people. He does not have a history of using alcohol, tobacco, or illicit drugs. He has no family history of sudden cardiac death or early coronary artery disease. View the electrocardiogram obtained (Figure 1) and consider what your diagnosis would be.