Pace capture and adenosine triphosphate provocation are complementary rather than mutually exclusive methods to...

Area of Science:

• Electrophysiology
• Cardiology
• Medical Devices

Background:

• Circumferential pulmonary vein isolation (CPVI) is a key treatment for paroxysmal atrial fibrillation (PAF).
• Identifying conduction gaps after CPVI is crucial for successful ablation.
• Adenosine triphosphate (ATP)-provoked dormant conduction (DC) and pacing are used to detect these gaps.

Purpose of the Study:

• To determine if ATP provocation and pacing are interchangeable endpoints for CPVI in PAF ablation.
• To evaluate the combined efficacy of ATP and pacing in improving long-term ablation outcomes.

Main Methods:

• 107 patients with PAF were randomized into two groups after CPVI: Group I (ATP first, then pacing) and Group II (pacing first, then ATP).
• Additional ablation was performed if conduction gaps were identified by either method.
• 12-month outcomes were compared to a historical control group that received only ATP testing.

Main Results:

• Both ATP and pacing identified conduction gaps, even after the other test was negative.
• Pacing identified gaps in 49% of patients with initially negative ATP tests (Group I).
• ATP identified DC in 18.5% of patients with initially negative pacing tests (Group II).
• The combined approach resulted in a higher proportion of patients (91.6%) free from atrial tachyarrhythmias at 12 months compared to the historical control (81.3%).

Conclusions:

• ATP provocation and pacing are complementary, not interchangeable, for assessing CPVI durability.
• Using both pacing and ATP testing leads to improved long-term success rates in CPVI for PAF.
• Combining these diagnostic modalities enhances the effectiveness of atrial fibrillation ablation.