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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 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.
View Article and Find Full Text PDFAn observational study on efficacy of atrioventricular nodal slow pathway ablation in patients with atrioventricular nodal reentrant tachycardia and its influence on atrioventricular conduction function.
Medicine (Baltimore)
November 2024
Department of Cardiology, Shanghai Fengxian District Central Hospital, Shanghai Jiao Tong University Affiliated Sixth People's Hospital South Campus, Shanghai, China.
Article Synopsis
- The study investigated the effectiveness of atrioventricular nodal slow pathway ablation for patients with AVNRT, analyzing data from 90 patients who underwent the procedure between August 2018 and February 2021.
- Patients were divided into two groups based on slow pathway conduction: the slow pathway elimination (SPE) group and the slow pathway improvement (SPI) group.
- Results showed a 100% success rate for the procedure in both groups, with significant changes in atrioventricular conduction parameters, but only one case of recurrence occurred in the SPI group over two years.
Variability of the PR intervals in Wenckebach atrioventricular block.
J Electrocardiol
December 2024
The Royal Melbourne Hospital and University of Melbourne, Parkville and Cardioscan PTY LTD, Camberwell, Victoria 3050, Australia. Electronic address:
The duration of the PR intervals in atypical Wenckebach atrioventricular block before and after a non-conducted P wave can exhibit a wide range of values and patterns. Understanding the different or at times puzzling manifestations of Wenckebach atrioventricular block in terms of its PR intervals can avoid diagnostic errors, especially the erroneous more serious diagnosis of Mobitz type II atrioventricular block.
View Article and Find Full Text PDFMobitz type II second-degree atrioventricular block: a commonly overdiagnosed and misinterpreted arrhythmia.
Front Cardiovasc Med
August 2024
Department of Medicine, Morsani College of Medicine, University of South Florida, Tampa, FL, United States.
Article Synopsis
- - Mobitz type II second-degree AV block is characterized by an all-or-none conduction with no changes in the PR interval, making the PR interval unchanged after the block essential for diagnosis.
- - Diagnosis requires a steady sinus rate, as factors like vagal surges can create false readings by slowing sinus rate and achieving AV nodal block simultaneously.
- - Correct identification is crucial, as Mobitz type II AVB originates at the His-Purkinje system and often indicates the need for a pacemaker, distinguishing it from other AV block types that can appear similar.
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