Validation Strategy for Pulmonary Vein Isolation in Patients With Paroxysmal Atrial Fibrillation in Long-Term...

Area of Science:

• Cardiology
• Electrophysiology
• Medical Devices

Background:

• Limited data exists comparing loose versus rigorous validation strategies for pulmonary vein isolation (PVI) in paroxysmal atrial fibrillation (PAF).
• This study prospectively evaluates the effectiveness of these validation methods in patients with PAF maintaining sinus rhythm.

Purpose of the Study:

• To compare the effectiveness of loose versus rigorous validation strategies for PVI in patients with PAF.
• To assess the impact of validation strategies on the detection of dormant conduction and long-term recurrence rates.

Main Methods:

• 117 patients with PAF were randomized to either loose (n=59) or rigorous (n=58) validation post-PVI.
• Loose validation used adenosine and isoproterenol; rigorous validation additionally employed Lasso catheter for complete pulmonary vein (PV) potential absence.
• Dormant conduction was ablated until all reconnections were eliminated.

Main Results:

• Rigorous validation group had longer procedure times (161.3 min vs. 142.5 min, p=0.03).
• Dormant PV reconnections were detected more frequently in the rigorous group (69.0% vs. 37.3%, p=0.001).
• Despite this, 1.3-year postablation recurrence rates were similar between groups (79.2% vs. 83.6%, p=0.67).

Conclusions:

• Rigorous validation identifies dormant conduction in over two-thirds of PAF patients undergoing PVI.
• However, rigorous validation and additional ablation do not enhance long-term outcomes when electrophysiological and pharmacological confirmation protocols are used.