Non-pulmonary vein mediated atrial fibrillation: A novel sub-phenotype

Area of Science:

• Cardiology
• Electrophysiology
• Personalized Medicine

Background:

• Atrial fibrillation (AF) is a heterogeneous disorder.
• Identifying AF sub-phenotypes (endophenotypes) is key for personalized treatment.
• Pulmonary vein isolation (PVI) response can help define AF endotypes.

Purpose of the Study:

• To identify patients with non-PV mediated AF using PVI outcomes.
• To define clinical associations of non-PV mediated AF.
• To explore AF endophenotypes for targeted therapies.

Main Methods:

• Analysis of patients undergoing repeat AF ablation from the Vanderbilt AF Ablation Registry.
• Definition of "non-PV mediated AF" based on absence of PV reconnection.
• Comparison with a "PV-mediated AF" group with successful PVI-only treatment.
• Univariate and multivariable logistic regression to identify clinical associations.

Main Results:

• 14% of repeat ablation patients (33/229) had no PV reconnection (non-PV mediated AF).
• Non-PV mediated AF patients were older, had larger left atria, and more non-paroxysmal AF.
• Multivariable analysis revealed non-paroxysmal AF as the sole independent predictor (OR 7.47, P<0.001).

Conclusions:

• Non-paroxysmal AF is the only independent clinical predictor of non-PV mediated AF.
• AF ablation outcome data can identify distinct AF sub-phenotypes.
• This approach facilitates personalized medicine strategies for AF management.