Atrium-atrioventricular node block: an unusual complication during catheter ablation of persistent atrial...

Area of Science:

• Electrophysiology
• Cardiac Ablation
• Atrial Fibrillation Management

Background:

• Persistent atrial fibrillation necessitates complex ablation strategies.
• Extensive ablation, including pulmonary vein, linear, and fractionated atrial electrogram ablation, is sometimes required.
• Complications can arise from extensive cardiac ablation procedures.

Observation:

• A case of complete atrioventricular block occurred after multiple catheter ablation procedures for persistent atrial fibrillation.
• The patient underwent extensive ablation, including circumferential pulmonary vein ablation, left atrial roof and mitral isthmus linear ablation, atrial septum ablation, cavotricuspid isthmus ablation, and complex fractionated atrial electrogram ablation.
• A conduction obstacle was identified, preventing sinus impulse transmission from the atria to the atrioventricular node.

Findings:

• Intensive ablation, particularly at the interatrial septum, can lead to unintended complications such as atrioventricular block.
• The observed conduction block suggests significant damage or alteration of atrial pathways.
• Careful consideration of ablation strategy at critical atrial sites is crucial.

Implications:

• This case underscores the importance of cautious and strategic ablation, especially in the interatrial septum, during atrial fibrillation treatment.
• Understanding potential complications like atrioventricular block is vital for electrophysiologists performing complex ablations.
• Refined ablation techniques may be needed to minimize risks while effectively treating persistent atrial fibrillation.