Allied Professionals (Non-physician submissions only) -> Clinical Research D-AB01 - The Wide Spectrum of Arrhythmia Care: EP Procedure to Follow-up (ID 24) Abstract

D-AB01-06 - Impact Of The Baseline Impedance Of The Left Atrium On Success Of Catheterablationfor Paroxysmalatrial Fibrillation Guided By Ablation Index (ID 1427)


Background: Index ablation (AI) is an effective ablation quality marker. Impedance is also an important factor for lesion formation.
Objective: To access the influence of the baseline impedance in the effect of ablation for atrial fibrillation (AF) guided by AI.
Methods: 101 patients with paroxysmal AF (PAF) were enrolled. All patients underwent radiofrequency ablation guided by the same AI strategy. The ablation strategy was pulmonary vein (PV) isolation with non-PV triggers ablation. The baseline impedance of the ablation points was recorded. The patients were followed up every 2 months.
Results: Following up 10.7±2.3 (4-14) months, success rates were 82.2%. No difference existed in baseline characteristics between the success group and the recurrence group. The median baseline impedance was 124.0Ω. The baseline impedance of the points in success group was lower compared to the recurrence group (122.9 vs. 130.5Ω, P<0.01). The success rate of low-impedance group (≤124Ω,n=54) was higher than that of high-impedance group (90.7% vs. 72.3%, P<0.05).
Conclusion: Baseline impedance correlates with clinical outcome of RFCA of PAF. Higher impedance in the same AI may result in an ineffective lesion which probably cause recurrence.