title: Coexistence of a bradycardia- and tachycardia-dependent bundle branch block.
abstract: Aberrant ventricular conduction is a rare phenomenon as compared with the more frequently occurring antrioventricular conduction disturbances. It leads to widening of the QRS complex, which is either due to a complete or functional block in one of the bundle branches or a block within the intramyocardial conduction system itself. Mechanisms that are potentially involved in the genesis of aberrant ventricular conduction are sudden shortening of cycle length (tachycardia-dependent phase III), antegrade block with retrograde concealed conduction, or bradycardia-dependent block (enhanced phase IV). In this paper, we present a patient with aberrant ventricular conduction with the occurrence of a tachycardia-dependent, as well as a bradycardia-dependent bundle branch block, which is an even rarer phenomenon.
authors.forename: H M M
authors.initials: HM
authors.lastname: Al Hashimi
authors.forename: A J J
authors.initials: AJ
authors.lastname: van Es
authors.forename: T
authors.initials: T
authors.lastname: Szili-Torok
authors.forename: M
authors.initials: M
authors.lastname: Gardien
authors.forename: G P
authors.initials: GP
authors.lastname: Molhoek
authors.forename: P M J
authors.initials: PM
authors.lastname: Verhorst
keywords: bradycardia-dependent; bundle branch block; mechanism; tachycardia-dependent