One substrate, two tachycardias and multiple QRS morphologies
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Date
2026-05-28
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
Description
Atriofascicular accessory pathways are most commonly associated with antidromic AVRT but can also be a source of automatic tachycardia. This presentation can be easily confused with ventricular tachycardia and should be considered in the differential diagnosis of a broad-complex tachycardia. Furthermore, the varying QRS morphology observed in both short and long VH tachycardias is likely attributable to conduction blocks (anterograde or retrograde respectively) within the left fascicles.
Keywords
Atriofascicular pathway, Mahaim, Automaticity, Changing QRS
Citation
Vatsal Singh et al., Indian Pacing and Electrophysiology Journal, https://doi.org/10.1016/j.ipej.2026.05.005