The HAV pattern in pediatric patients with atrioventricular node reentrant tachycardia

• Main Authors: Jose M. Moltedo, Mauricio S. Abello, David Doiny, Estela Falconi, María G. Majdalani, Carlos J. Diaz, Guillermo Macias, Christopher S. Snyder
• Format: Article
• Language: English
• Published: Elsevier 2020-11-01
• Series: Indian Pacing and Electrophysiology Journal
• Subjects: Supraventricular tachycardia- AV nodal Reentry tachycardia-children
• Online Access: http://www.sciencedirect.com/science/article/pii/S0972629220300644

Objectives: The purpose of this study is to assess the prevalence of a His-Atrial-Ventricular (HAV) pattern, i.e. the atrial electrogram following the His bundle -HB- electrogram and preceding the ventricular one, on the catheter placed in the His position in pediatric patients during typical atrioventricular node reentry (AVNRT). Materials and methods: The pediatric electrophysiology databases of two separate institutions were queried for patients with a diagnosis of AVNRT. Demographic, clinical data and the electrophysiology study (EPS) information were assessed. Results: Thirty-nine consecutive patients were included. Twenty-five were female. The average age at the time of the EPS was 12 ± 3.7 years. Induction was achieved with atrial pacing in 23, with a single atrial extra stimulus in 8 and with dual atrial extra stimuli in 8. Isoproterenol was needed to induce tachycardia in 21. Tachycardia cycle length averaged 320 ± 50 ms. An HAV pattern was present in 35 (74%) of the patients, and in 100% of the patients younger than 8. Conclusions: An HAV pattern on the catheter placed in the His position, is common in pediatric patients with AVNRT, occurring in up to 74% of the patients in this population, being more common in younger patients.