Unusual locations for adenosine-sensitive accessory atrioventricular pathways with decremental conduction

Area of Science:

• Electrophysiology
• Cardiology
• Cardiac Anatomy

Background:

• Accessory atrioventricular (AV) pathways with decremental conduction are considered uncommon.
• These pathways are typically not expected to occur at the anterior mitral annulus.

Observation:

• This study reports successful catheter ablation in three patients.
• The patients presented with accessory AV pathways exhibiting adenosine sensitivity and decremental conduction properties.
• These pathways were precisely located at the anteroseptal, anteroparaseptal, and anterolateral mitral annulus.

Findings:

• Accessory pathways demonstrating decremental conduction can indeed be found throughout the entire mitral annulus.
• This includes the region of fibrous continuity between the aortic leaflet of the mitral valve and the aortic valve.

Implications:

• The findings expand the known anatomical distribution of decremental accessory AV pathways.
• This challenges previous beliefs and may influence ablation strategies for certain arrhythmias.
• Successful ablation highlights the feasibility of treating these uncommon pathways.