Low-Power Long-Duration Versus High-Power Short-Duration Radiofrequency Ablation of the Atrioventricular Node

Abstract

Background: Atrioventricular node (AVN) radiofrequency (RF) ablation is a highly effective treatment of atrial tachyarrhythmias that are resistant to other management modalities. To date, there is limited research that compares the properties of different RF ablation catheters. The current study aims to compare the effectiveness of several types of RF catheters in AVN ablation.

Methods: A total of 66 patients, with a mean age of 73.27 years, underwent AVN RF ablation. The catheters used were categorized as unirrigated (UI), externally irrigated, and contact force sensing with 10 to 20 g of force. Externally-irrigated catheters were divided into 2 different settings: low-power long-duration (LPLD) (30 W, 45°C, and 60 seconds) and high-power short-duration (HPSD) (50 W, 43°C, and 12 seconds). We compared the success rate of the different RF catheters using logistic regression and lesion times using linear regression.

Results: The distribution of the types of catheters used is UI in 48%, LPLD in 16%, and HPSD in 36% of patients. All ablation procedures were successful, with no immediate postprocedure complications. HPSD had a significantly shorter lesion time than UI catheters by 403.42 seconds (-631.67 to -175.17).

Conclusions: UI catheters, LPLD, and HPSD were equally safe and effective in ablation procedures. The HPSD catheter had a significantly shorter lesion time and, thus, overall decreased procedure time.