Snapshot A 22-year-old man presents to his primary care physician for an annual examination. He currently has no acute complaints but is worried he has "heart disease" since his father died from a "heart attack." He denies any episodes of lightheadedness or syncopal episodes. He exercises regularly as he is part of his university's basketball team. An electrocardiogram demonstrates sinus rhythm with a PR interval of 250 ms. He is provided reassurance that nothing needs to be done. (First-degree atrioventricular block) Introduction Overview login to view 6 more bullets Etiology SA and AV node dysfunction login to view 10 more bullets Presentation Symptoms login to view 5 more bullets Physical exam login to view 2 more bullets Studies Electrocardiogram login to view 13 more bullets Treatment Overview login to view 8 more bullets Conservative login to view 4 more bullets Medical login to view 6 more bullets Procedural login to view 6 more bullets Complications Syncope Cardiac death