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Paroxysmal atrioventricular block induced during paroxysmal intra-atrial reentrant tachycardia
Paroxysmal atrio-ventricular (AV) block is a relatively rare form of bradyarrhythmia that may be caused by vagal reflex, intrinsic His-Prukinje system (HPS) disorder, or idiopathic mechanisms. We report a case with paroxysmal AV block and syncopal episodes that appeared only during intra-atrial reen...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Japanese College of Cardiology
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8617479/ https://www.ncbi.nlm.nih.gov/pubmed/34868406 http://dx.doi.org/10.1016/j.jccase.2021.04.009 |
Sumario: | Paroxysmal atrio-ventricular (AV) block is a relatively rare form of bradyarrhythmia that may be caused by vagal reflex, intrinsic His-Prukinje system (HPS) disorder, or idiopathic mechanisms. We report a case with paroxysmal AV block and syncopal episodes that appeared only during intra-atrial reentrant tachycardia (IART) after an ablation procedure. Syncope did not occur under sinus rhythm with stable 1:1 AV conduction. An HPS disorder was proven in an electrophysiological study. It was suggested that paroxysmal AV block was induced via a tachycardia-dependent mechanism with an exacerbation of latent HPS disorder. The occurrence of the IART was only transient, and there was no recurrent syncope during one-year follow-up. Pacemaker implantation could be avoided. <Learning objective: Paroxysmal atrio-ventricular block is a relatively rare form of bradyarrhythmia and can occur only during atrial tachyarrhythmia. Indications for a cardiac implantable electrical device should be carefully considered if the attributed tachycardia is treatable.> |
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