Radiofrequency ablation of multiple accessory pathways.

Area of Science:

• Cardiology
• Electrophysiology
• Medical Devices

Background:

• Wolff-Parkinson-White Syndrome (WPW) is characterized by accessory pathways that can be single or multiple.
• Understanding the characteristics and ablation outcomes of multiple accessory pathways is crucial for effective treatment.

Purpose of the Study:

• To review clinical and electrophysiological characteristics of radiofrequency catheter ablation in patients with multiple accessory pathways.
• To compare ablation outcomes in patients with multiple accessory pathways versus single accessory pathways.

Main Methods:

• Electrophysiological study and radiofrequency catheter ablation were performed in 1010 WPW patients.
• Multiple accessory pathways were identified in 31 patients (3.1%), with 63 pathways ablated.
• Ebstein's anomaly was noted in 9 patients with atrioventricular bypass tracts.

Main Results:

• Radiofrequency ablation successfully treated 81% of the 63 accessory pathways without complications.
• The most common pathway combination was right posteroseptal with right free wall bypass tracts.
• Recurrence was observed in 9.5% of cases after a 5-year follow-up.

Conclusions:

• Radiofrequency ablation is a viable treatment for multiple accessory pathways in WPW syndrome, achieving high success rates in a single session.
• Success rates for multiple accessory pathways (81%) were slightly lower than for single pathways (93%).
• The procedure demonstrated a high success rate and acceptable recurrence rate for complex cases.