title: 4:1 atrioventricular (AV) block.
authors.forename: Shinji
authors.initials: S
authors.lastname: Kinoshita
authors.forename: Norihiro
authors.initials: N
authors.lastname: Kiyota
authors.forename: Junko
authors.initials: J
authors.lastname: Kashimura
authors.forename: Takakazu
authors.initials: T
authors.lastname: Katoh
mesh_terms: D001282:Atrial Flutter / Q000175:diagnosis / Q000503:physiopathology*; D004562:Electrocardiography; D006327:Heart Block / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged