Transient narrowing of a wide QRS tachycardia. What is the mechanism?

Electrocardiogram showing a regular wide QRS tachycardia with left branch block (LBBB) like in morphology at 200 beats per minute (bpm). During electrophysiology study, it suddenly gets narrow and faster. What is the mechanism of the switch from a broad complex to a narrow complex tachycardia?[Image...

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Detalles Bibliográficos
Autores principales: Ribes, Francisco, Martínez‐Brótons, Ángel, Ferrero‐De‐Loma‐Osorio, Ángel, Bondanza, Lourdes, Albiach, Cristina, Marcos‐Garcés, Víctor, Ruiz‐Granell, Ricardo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2020
Materias:
Eps for Resident Physicians
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7279974/
https://www.ncbi.nlm.nih.gov/pubmed/32528587
http://dx.doi.org/10.1002/joa3.12334
Descripción
Sumario:Electrocardiogram showing a regular wide QRS tachycardia with left branch block (LBBB) like in morphology at 200 beats per minute (bpm). During electrophysiology study, it suddenly gets narrow and faster. What is the mechanism of the switch from a broad complex to a narrow complex tachycardia?[Image: see text]

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