title: Atrioventricular Nodal Reentrant Tachycardia with 2:1 Atrioventricular Block.
abstract: This report illustrates an interesting case of atrioventricular nodal reentrant tachycardia that presented with 2 different ventricular cycle lengths due to a 2:1 block in the lower common pathway. At the induction of the tachycardia, a long-short sequence above the His creates a phase 3 block resulting in a 2:1 conduction in the lower common pathway. A premature ventricular contraction, by retrograde penetration of the His, eliminates the long-short sequence and brings the conduction back to 1:1.
authors.affiliation: Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, University of California, San Francisco, San Francisco, CA, USA.
authors.forename: Leila
authors.initials: L
authors.lastname: Larroussi
authors.affiliation: Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, University of California, San Francisco, San Francisco, CA, USA; UCSF Medical Center, 500 Parnassus Avenue, MUE-431, San Franicsco, CA 94143, USA. Electronic address: nitish.badhwar@ucsf.edu.
authors.forename: Nitish
authors.initials: N
authors.lastname: Badhwar
mesh_terms: D054537:Atrioventricular Block / Q000150:complications / Q000175:diagnosis / Q000503:physiopathology; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008875:Middle Aged; D013611:Tachycardia, Atrioventricular Nodal Reentry / Q000150:complications / Q000175:diagnosis / Q000503:physiopathology
keywords: AV block; AVNRT; Atrioventricular nodal reentrant tachycardia