title: Country cardiograms case 54.
authors.affiliation: Adult Cardiology, Division of Cardiology, Mazankowski Alberta Heart Institute, University of Alberta, Edmonton, Alta.
authors.forename: Brent M
authors.initials: BM
authors.lastname: McGrath
authors.affiliation: Adult Cardiology, Division of Cardiology, Mazankowski Alberta Heart Institute, University of Alberta, Edmonton, Alta.
authors.forename: Xi
authors.initials: X
authors.lastname: Zhao
mesh_terms: D000328:Adult; D054537:Atrioventricular Block / Q000175:diagnosis*; D004562:Electrocardiography; D006801:Humans; D008297:Male