title: Challenging educational electrocardiography cases.
abstract: Three challenging educational electrocardiography cases are presented and the electrocardiographic findings discussed.
authors.affiliation: Section of Cardiology, University of Puerto Rico School of Medicine, Puerto Rico Health Science Center, Rio Piedras, Puerto Rico.
authors.forename: Charles D
authors.initials: CD
authors.lastname: Johnson
mesh_terms: D000328:Adult; D001145:Arrhythmias, Cardiac / Q000175:diagnosis* / Q000503:physiopathology; D004562:Electrocardiography; D006801:Humans; D008297:Male; D008875:Middle Aged