title: Mind the gap.
abstract: We present a case of a woman with an asymptomatic intermittent 2:1 atrioventricular block. The baseline ECG showed a wide QRS with right bundle branch block pattern. Measurement of the HV interval during electrophysiological study was normal. During electrophysiological stimulation, a unique pattern of paradoxical conduction was seen. We discuss the mechanism of the paradoxical conduction.
authors.affiliation: Department of Cardiology, Carmel Medical Center, Haifa, Israel. Electronic address: asdanon@gmail.com.
authors.forename: Asaf
authors.initials: A
authors.lastname: Danon
authors.affiliation: Heart Institute, Hadassah-Hebrew University Medical Center, Jerusalem, Israel.
authors.forename: Yair
authors.initials: Y
authors.lastname: Elitzur
authors.affiliation: Schulich Heart Center, Sunnybrook Health Sciences Center, University of Toronto, Canada.
authors.forename: Sheldon M
authors.initials: SM
authors.lastname: Singh
mesh_terms: D000368:Aged; D054537:Atrioventricular Block / Q000503:physiopathology*; D002037:Bundle-Branch Block / Q000503:physiopathology; D004562:Electrocardiography; D005260:Female; D006329:Heart Conduction System / Q000503:physiopathology; D006801:Humans
keywords: Atrioventricular block; Gap phenomenon; Infrahisian block; Phase 4 block; Supranormal conduction