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©2013 UpToDate ® Print Email 2:1 infra-Hisian block The baseline 12-lead electrocardiogram in this patient demonstrated sinus rhythm with 2:1 AV block with prolonged AV conduction, an anterior wall myocardial infarction, right bundle branch block, and left anterior fascicular block. All 12 surface leads are shown. Representative intracardiac tracings are the distal His bundle electrogram (HIS d) and the proximal His bundle electrogram (HIS p). Every other atrial depolarization is followed by a His, but no ventricular depolarization (arrows) indicating infra-Hisian block. Note the normal A-H intervals and prolonged H-V intervals on conducted beats. A: atrial depolarization; AV: atrioventricular; H: His bundle depolarization; V: ventricular depolarization. Courtesy of Joseph J Germano, DO.