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Irregular Narrow QRS Tachycardia: What Is the Mechanism?
J Cardiovasc Electrophysiol
December 2024
Department of Cardiovascular Medicine, National Cerebral and Cardiovascular Center, Osaka, Japan.
Atypical Wenckebach AV Block in the Infra-Hisian Region: Clinical Implications and Management.
Am J Case Rep
December 2024
Department of Cardiac Pacing and Electrophysiology, Fortis Escorts Heart Institute (FEHI), New Delhi, India.
BACKGROUND Second-degree atrioventricular (AV) block is a frequently encountered conduction abnormality on surface electrocardiogram (ECG). However, it does not always imply a block at the AV nodal level. In rare cases, this block can occur below the bundle of His, within the infra-Hisian region of the His-Purkinje system.
View Article and Find Full Text PDFTwo Distinct Atrial Breakthroughs During Fast-Slow Atrioventricular Nodal Reentrant Tachycardia.
J Cardiovasc Electrophysiol
December 2024
Department of Cardiovascular Medicine, Gunma University Graduate School of Medicine, Maebashi, Japan.
Introduction: The slow atrioventricular nodal pathway (SP) typically has a single atrial breakthrough site.
Methods And Results: We report a case of fast-slow type AVNRT with two distinct atrial breakthrough sites during tachycardia. The earliest atrial activation site (EAAS) was at the right inferior septum, followed by the inferolateral wall of the tricuspid annulus.
The pacing maneuvers for supraventricular tachycardia with cycle length alternans are sometimes difficult, especially when diagnostic ventricular pacing does not conduct to the atrium. Even in such a situation, critical diagnostic findings can be obtained by spontaneous premature ventricular contraction.
View Article and Find Full Text PDFWenckebach-periodic VA prolongation and abrupt shortening of HH interval during tachycardia indicate (i) a retrograde block at the upper common pathway that manifested a retrograde atrial activation via the superior slow pathway, and (ii) an antegrade return of a retrograde atrial activation to His bundle via the fast pathway.
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