Recurrent Post-Ablation Paroxysmal Atrial Fibrillation Shares Substrates With Persistent Atrial Fibrillation : An...

Area of Science:

• Cardiology
• Electrophysiology
• Atrial Fibrillation Research

Background:

• The role of atrial fibrillation (AF) substrates in paroxysmal AF (PAF) recurrence post-pulmonary vein isolation (PVI) is not fully understood.
• Patients with recurrent PAF after PVI may have distinct electrical and structural substrates compared to those undergoing initial ablation.

Purpose of the Study:

• To investigate and compare the electrical and structural substrates of recurrent post-ablation (redo) PAF with de novo PAF and persistent AF.
• To determine if redo PAF substrates resemble persistent AF more than de novo PAF.

Main Methods:

• Compared AF substrates in both atria using 64-pole basket catheters and phase mapping in 175 patients.
• Assessed anatomical remodeling indices in patients with de novo PAF, redo PAF, and first-time persistent AF.

Main Results:

• Electrical sources were present in all patients; de novo PAF had more peripulmonary vein sources than redo or persistent AF.
• Redo PAF patients exhibited residual non-pulmonary vein sources post-PVI.
• Left atrial size was similar in de novo and redo PAF but larger in persistent AF patients.

Conclusions:

• Patients with paroxysmal AF despite prior PVI exhibit electrical substrates more akin to persistent AF than those with paroxysmal AF at first ablation.
• Structural indices do not differentiate between de novo and redo PAF subgroups.
• Findings suggest further investigation into trigger versus substrate mechanisms for recurrent PAF post-PVI.