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Related Concept Videos

Cardiac Catheterization III: Left Heart Catheterization01:24

Cardiac Catheterization III: Left Heart Catheterization

Left heart catheterization is an invasive diagnostic procedure used to evaluate the function and structure of the left side of the heart. It is generally performed to diagnose and treat cardiovascular conditions such as valve abnormalities, coronary artery disease, and congenital heart defects.Diagnostic and therapeutic purposesLeft heart catheterization serves various diagnostic and therapeutic purposes, including:Assessing coronary artery bypass grafts.Evaluating coronary artery disease in...

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Updated: Jun 26, 2026

High-Resolution Endocardial and Epicardial Optical Mapping in a Sheep Model of Stretch-Induced Atrial Fibrillation
09:17

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Published on: July 29, 2011

Visualizing ablation gaps in vitro using a deflectable fiber optic endocardial visualization catheter.

Afraaz R Irani1, Bryant Lin, Christian Eversull

  • 1Stanford University School of Medicine, Stanford, USA.

Journal of Interventional Cardiac Electrophysiology : an International Journal of Arrhythmias and Pacing
|January 17, 2009
PubMed
Summary

Direct visualization catheters accurately identify gaps between radiofrequency ablation lesions, improving atrial fibrillation treatment. This technology helps ensure complete electrical isolation for successful pulmonary vein isolation procedures.

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Published on: January 31, 2019

Area of Science:

  • Cardiology
  • Medical Imaging
  • Electrophysiology

Background:

  • Pulmonary vein isolation (PVI) for atrial fibrillation (AF) can be limited by incomplete lesions.
  • Gaps between ablation lesions lead to failed electrical isolation and treatment failure.
  • A deflectable fiberoptic endocardial visualization catheter offers direct imaging of the endocardial surface.

Purpose of the Study:

  • To evaluate the ability of a direct visualization catheter to identify gaps between radiofrequency ablation lesions.
  • To assess the accuracy of gap detection in porcine endocardium.

Main Methods:

  • Radiofrequency ablation lesions were created in porcine endocardium.
  • A deflectable fiberoptic endocardial visualization catheter was used to image the lesions.
  • Two readers analyzed videos of the lesions to identify and measure gaps.

Main Results:

  • Ninety-four lesion gaps were analyzed.
  • The combined accuracy of the readers in identifying gaps was 98.4%.
  • Gaps as small as less than 1 mm could be identified.

Conclusions:

  • Direct visualization catheters can accurately detect gaps between ablation lesions, even small ones.
  • This technology shows promise for improving the success rates of PVI in atrial fibrillation treatment.
  • Further in vivo studies are needed to confirm these findings.