Why the study?
Larger local impedance drops correlate with more effective lesion formation, but whether local impedance drop is associated with conduction block during pulmonary vein isolation remained to be evaluated.
Does local impedance drop predict acute conduction block in patients with paroxysmal atrial fibrillation undergoing pulmonary vein isolation?
Comparison
Segments with acute conduction block vs segments with gaps
Design
LI-blinded clinical trial
Follow-up
20-min waiting period
Key result
Acutely blocked segments during pulmonary vein isolation had a significantly larger local impedance drop (median 19.8 Ω) compared with segments with gaps (10.6 Ω, P<0.001).
Authors
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Supports local impedance drop as a marker of acute block in PVI; leaves open whether targeting larger drops improves durable isolation.
Observational (n=60)
Single-blind
Does local impedance drop predict acute conduction block in patients with paroxysmal atrial fibrillation undergoing pulmonary vein isolation?
Absolute Event Rate: 19.8% vs 10.6%
p-value: p=< 0.001
The magnitude of local impedance drop during radiofrequency ablation is highly predictive of acute pulmonary vein isolation segment conduction block, with different optimal cut-offs depending on atrial wall thickness.
Das et al. (2021) conducted an observational in paroxysmal atrial fibrillation (n=60). Local impedance drop vs. Segments with gaps was evaluated on acute segment conduction block (p=< 0.001). Acutely blocked segments during pulmonary vein isolation had a significantly larger local impedance drop (median 19.8 Ω) compared with segments with gaps (10.6 Ω, P<0.001).
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