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A 40-year-old man without risk factors presented to the emergency department after a recurrent syncope at rest. Despite his excessive abdominal fat, he underwent physical training (2 h every day). Family history disclosed that his father had died suddenly during sleep at the age of 43 years. Laboratory tests were normal. Baseline ECG showed a sinus rhythm of 91 bpm, first-degree atrioventricular block (PR 220 ms), narrow QRS complex …
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