Anatomical Ablation of the Atrioventricular Node

Area of Science:

• Cardiology
• Electrophysiology
• Cardiac Anatomy

Background:

• Atrioventricular (AV) conduction ablation targets the His bundle to reduce junctional escape rhythms.
• Previous methods relied on recording His bundle potentials for ablation targeting.
• A hypothesis proposed that specific AV nodal ablation is both feasible and safe.

Purpose of the Study:

• To determine the feasibility and safety of anatomical ablation of the atrioventricular (AV) node.
• To assess the efficacy of AV nodal ablation using anatomical criteria.
• To evaluate the characteristics of the escape rhythm following AV nodal ablation.

Main Methods:

• Identified the anatomical position of the AV node using human heart dissections and histological sections.
• Utilized radiofrequency (RF) ablation guided by precise anatomical landmarks.
• Attempted specific anatomical AV node ablation in 72 patients.

Main Results:

• Successful AV nodal ablation was achieved in 87.5% of patients (63/72).
• The procedure involved a median of 60 minutes, 3.4 minutes of fluoroscopy, and 4 RF lesions.
• A similar escape rhythm was observed in 71% of patients post-ablation, with no restoration of conduction upon atropine administration.

Conclusions:

• Anatomical ablation of the AV node is a feasible and safe interventional strategy.
• The procedure effectively ablates AV conduction while maintaining a similar escape rhythm.
• Persistent AV block was achieved in all cases without sudden death during follow-up.