[Radiofrequency ablation of accessory pathway's atrial insertion site]

Area of Science:

• Cardiology
• Electrophysiology
• Medical Devices

Background:

• Radiofrequency catheter ablation (RFCA) has been a cornerstone for treating pre-excitation syndromes since the 1980s.
• Various RFCA techniques exist, with operator preference and experience influencing the choice.
• Accessory pathways causing WPW syndrome require effective and safe ablation strategies.

Purpose of the Study:

• To assess the efficacy and safety of RFCA targeting the atrial insertion site of accessory pathways.
• To evaluate the utility of unipolar signals from ablation catheters in guiding RFCA.
• To compare outcomes based on the anatomical location (left-sided vs. right-sided) of accessory pathways.

Main Methods:

• A study population of 149 patients with symptomatic, drug-resistant WPW syndrome underwent electrophysiologic study and RFCA.
• Patients were divided into two groups: left-sided (n=112) and right-sided (n=37) accessory pathways.
• RFCA utilized diagnostic electrodes and unipolar signals from ablation catheters; transseptal puncture was used for left-sided pathways.

Main Results:

• Success rates were high in both groups (92.8% left-sided, 86.5% right-sided).
• RFCA duration was slightly longer for left-sided pathways (136.4 min vs. 123.6 min).
• Fluoroscopy time was significantly longer for left-sided pathways (37.2 min vs. 28.4 min, p < 0.05), with one complication per group.

Conclusions:

• RFCA targeting the accessory pathway's atrial insertion site using unipolar ablation catheter signals is a safe and effective treatment for WPW syndrome.
• The technique demonstrates good efficacy regardless of accessory pathway location.
• Minimizing fluoroscopy time, particularly for left-sided pathways, may be an area for future optimization.