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April 7, 2021Journal of ArrhythmiaOpen Access

Local impedance drop was significantly higher than generator impedance drop (23.7 vs 9.0; P < .01) and varied significantly by anatomical location (P < .01), whereas generator impedance drop did not (P = .49).

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Why the study?

Does local impedance drop provide a more sensitive marker for lesion formation than generator impedance drop during initial atrial fibrillation ablation?

Population

111 radiofrequency applications in 7 AF patients without prior ablation

Comparison

Local impedance drop vs generator impedance drop

Authors

KHKenji HashimotoITIppei TsuzukiYSYuta Seki

Discussion

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Overview

May inform real-time lesion assessment in initial AF ablation; hypothesis-generating and requires validation in larger trials.

Structured PICO

Does local impedance drop provide a more sensitive marker for lesion formation than generator impedance drop during initial atrial fibrillation ablation?

P
Population
7 patients with atrial fibrillation (2 persistent) without a history of prior ablation, undergoing 111 representative radiofrequency applications. Median age 68 [65-72] years, 6 males.
I
Intervention
Radiofrequency ablation using a micro-electrode tip catheter (MiFi) with measurement of local impedance (LI)
C
Comparator
Generator impedance (GI) measurement
O
Outcome
Local impedance (LI) drop compared to generator impedance (GI) drop after radiofrequency applicationssurrogate

Local impedance drop measured by a micro-electrode tip catheter may be a more sensitive and location-specific marker for lesion formation than generator impedance during AF ablation.

Cite This Study

Hashimoto et al. (2021) studied this question.

synapsesocial.com/papers/6a708125f44fa9f079de29bchttps://doi.org/10.1002/joa3.12535
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1A novel local impedance algorithm to guide effective pulmonary vein isolation in atrial fibrillation patients: Preliminary experience across different ablation sites from the CHARISMA pilot study2020 · 31 citations
  2. 2A novel assessment of local impedance during catheter ablation: initial experience in humans comparing local and generator measurements2018 · 60 citations
  3. 3Clinical utility of local impedance monitoring during pulmonary vein isolation2020 · 14 citations
  4. 4Insight into contact force local impedance technology for predicting effective pulmonary vein isolation2023 · 12 citations
  5. 5Local catheter impedance drop during pulmonary vein isolation predicts acute conduction block in patients with paroxysmal atrial fibrillation: initial results of the LOCALIZE clinical trial2021 · 71 citations