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Related Experiment Video

Updated: Jun 12, 2026

Cooling or Warming the Esophagus to Reduce Esophageal Injury During Left Atrial Ablation in the Treatment of Atrial Fibrillation
06:25

Cooling or Warming the Esophagus to Reduce Esophageal Injury During Left Atrial Ablation in the Treatment of Atrial Fibrillation

Published on: March 15, 2020

Maximizing parameters for tissue ablation by using an internally cooled electrode.

John P McGahan1, Shaun Loh, Fernando J Boschini

  • 1Department of Radiology, University of California, Davis Medical Center, 4860 Y St, Suite 3100, Sacramento, CA 95817, USA. john.mcgahan@ucdmc.ucdavis.edu

Radiology
|June 10, 2010
PubMed
Summary
This summary is machine-generated.

Gradually increasing radiofrequency power and repeating ablations after reaching impedance significantly enhanced tissue coagulation in an ex vivo liver model, optimizing ablation techniques.

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Reduced Procedure Time and Variability with Active Esophageal Cooling During Radiofrequency Ablation for Atrial Fibrillation

Published on: August 25, 2022

Area of Science:

  • Medical Devices
  • Surgical Technology
  • Biomedical Engineering

Background:

  • Radiofrequency (RF) ablation is a key technique for tissue coagulation.
  • Optimizing RF power delivery is crucial for maximizing ablation volume and efficacy.
  • Understanding the impact of power ramp-up and impedance monitoring is essential for procedural success.

Purpose of the Study:

  • To compare a gradually ramped-up power algorithm versus a full-power technique for radiofrequency ablation.
  • To determine the technical parameters that maximize tissue coagulation using a saline-perfused electrode in an ex vivo liver model.

Main Methods:

  • Utilized an ex vivo bovine liver model with a standard RF generator and internally cooled needle.
  • Performed multiple RF ablations, comparing constant power levels (20-60 W) with gradually ramped-up power algorithms.
  • Investigated ablation volumes at varying power levels, impedance control, and post-impedance durations.

Main Results:

  • Maximum tissue coagulation plateaued between 40-60 W.
  • Gradually ramped-up power algorithms produced significantly larger ablation volumes compared to constant 50 W power.
  • Ablations continuing past impedance or repeated post-impedance yielded greater tissue coagulation than those stopped at maximum impedance.

Conclusions:

  • A gradual power ramp-up strategy enhances tissue ablation efficacy.
  • Repeating RF ablations after reaching the impedance level further increases ablation volume.
  • These findings suggest optimized power delivery strategies for improved RF ablation outcomes.