Catheter ablation of a difficult accessory pathway guided by coronary sinus venography and 3D electroanatomical...

Area of Science:

• Cardiology
• Electrophysiology
• Medical Devices

Background:

• Recurrent arrhythmias after ablation pose significant clinical challenges.
• Accessory pathways (APs) can be difficult to ablate, especially in proximity to cardiac structures.
• Cardiac arrest necessitates urgent and effective intervention.

Purpose of the Study:

• To describe a successful reablation strategy for a complex accessory pathway.
• To highlight the role of electroanatomical mapping in identifying ablation targets.
• To present a case of radiofrequency ablation of an accessory pathway associated with a coronary sinus diverticulum.

Main Methods:

• Three-dimensional electroanatomical mapping was utilized for detailed anatomical and electrical assessment.
• Coronary sinus venography was performed to delineate vascular structures.
• Radiofrequency ablation was delivered at the specific site of the accessory pathway identified within the diverticulum.

Main Results:

• A large diverticulum near the coronary sinus ostium was identified as the anatomical substrate.
• A single radiofrequency ablation application at the neck of the diverticulum successfully eliminated accessory pathway conduction.
• The patient's refractory accessory pathway was completely treated, resolving the arrhythmia.

Conclusions:

• Radiofrequency ablation targeting anatomical abnormalities like coronary sinus diverticula can be effective for refractory accessory pathways.
• Advanced mapping techniques are crucial for identifying ablation sites in complex cardiac anatomy.
• Successful reablation of accessory pathways, even after prior failures, is achievable with precise targeting.