title: Diagnostic puzzle. Interesting E.C.G.
mesh_terms: D000293:Adolescent; D001281:Atrial Fibrillation / Q000175:diagnosis*; D005117:Cardiac Complexes, Premature / Q000175:diagnosis*; D004562:Electrocardiography; D006801:Humans; D008297:Male; D013614:Tachycardia, Paroxysmal / Q000175:diagnosis*