Prospective Randomized Comparison of 8‐mm Gold‐Tip, Externally Irrigated‐Tip and 8‐mm Platinum‐Iridium Tip Catheters for Cavotricuspid Isthmus Ablation

Abstract

This study demonstrates equivalent efficacies of gold, platinum-iridium and externally Irr. tip catheters for successful de novo ablation of the CTI.

Lumped Element Electrical Model based on Three Resistors for Electrical Impedance in Radiofrequency Cardiac Ablation: Estimations from Analytical Calculations and Clinical Data

“…This closely agrees with our analytical estimate, which suggests a difference of between 21 and 28 Ω, according to the insertion depth of the active electrode. The difference in impedance found by Sacher et al [18] with 4-mm –irrigated– electrodes (116±12 Ω) and 8-mm electrodes (92±15 Ω) is also inside this estimated range (24 Ω).…”

Effect of electrode thermal conductivity in cardiac radiofrequency catheter ablation: A computational modeling study

“…There are many potential reasons for this discrepancy, among them incorrect material properties, geometry of the myocardial surface, and differences in power application algorithm. However, the small increase in lesion dimensions we found in the simulations could explain the lack of significant difference in efficacy found in clinical trials that have compared the two electrode materials [9,10]. Therefore, while differences in electrode material properties may provide advantages in particular clinical situations, our modeling results suggest only potentially minor benefits.…”

“…lesions with Au electrodes [7,8], clinical studies have not shown any significant differences in applied power, tip temperature, or clinical outcome between ablations with the two electrode materials [9,10].…”

“…This increased cooling of the electrode-tissue interface allows greater power to be applied for a given target tip temperature during the ablation. Although ex vivo results showed that the use of gold electrodes led to larger thermal lesions [7,8], clinical studies did not demonstrate any significant difference between the two electrode materials in terms of applied power, tip temperature or clinical outcome [9,10].…”

“…Several studies have investigated the effect of the use of different catheter tip (i.e. electrode) materials on thermal lesion size due to varying thermal properties of these materials, including both ex-vivo [7,8] and clinical studies [9,10].…”