The Effects of AVNRT Ablation on the Conduction System

Authors : Mehmet Hakan Uzun, Mevlüt Serdar Kuyumcu

Pages : 56-60

View : 17 | Download : 57

Publication Date : 2025-03-15

Article Type : Research Paper

Abstract :Introduction: Atrioventricular nodal reentrant tachycardia (AVNRT) is one of the most common types of narrow QRS complex supraventricular tachycardias. Catheter ablation is considered one of the most effective treatment methods for AVNRT due to its high success rates and low complication risks. However, it is crucial to evaluate the changes in the atrioventricular conduction system following ablation. In this study, electrocardiographic changes in patients who underwent AVNRT ablation were analyzed. Methods: A total of 148 patients who were presented with palpitations and were diagnosed with AVNRT through an electrophysiological study between January 2023 and December 2024 were included in the study. The minimum required sample size to detect a 1 msn difference between the two groups was calculated as at least 44 individuals with 90% power and a 0.05 Type I error using the open-source program R 3.0.1. Descriptive statistics of the data included mean, standard deviation, ratio, and frequency values. The Kolmogorov-Smirnov test was used to assess the normality of continuous variable distributions. The McNemar test was used for the analysis of dependent variables. The Student\\\'s t-test was used for the analysis of parametric data, while the Mann-Whitney U test was used for nonparametric data. Statistical significance was defined as p < 0.05. Results: After ablation, heart rate increased significantly, while the QRS duration also showed a statistically significant prolongation. A slight but significant prolongation was observed in the PR interval as well. However, no significant change was detected in the corrected QT interval. Conclusions: Following AVNRT ablation, slight but significant changes were observed in heart rate, QRS duration, and PR interval. These changes are thought to be associated with the modification of the slow pathway of the atrioventricular node. The absence of a significant change in the QTc interval suggests that ablation does not have a negative impact on ventricular repolarization. These electrocardiographic changes following successful AVNRT ablation may serve as potential predictors of success, particularly in patients without well-defined endpoints.
Keywords : kardiyak ileti sistemi, kateter ablasyon., AVNRT