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Related Experiment Video

Updated: Jul 19, 2026

High-Resolution Endocardial and Epicardial Optical Mapping in a Sheep Model of Stretch-Induced Atrial Fibrillation
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Published on: July 29, 2011

High-resolution mapping around the eustachian ridge during typical atrial flutter.

Jin-Long Huang1, Ching-Tai Tai, Tu-Ying Liu

  • 1Heart Failure Division, Cardiovascular Center, Taichung Veterans General Hospital, Taipei, Taiwan.

Journal of Cardiovascular Electrophysiology
|November 1, 2006
PubMed
Summary

This study reveals three distinct activation patterns around the Eustachian ridge (ER) during typical atrial flutter (AFL), indicating the ER acts as a barrier. Understanding these patterns improves AFL management.

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Area of Science:

  • Electrophysiology
  • Cardiac Anatomy

Background:

  • Typical atrial flutter (AFL) reentrant circuits are known, but activation around the Eustachian ridge (ER) is not fully understood.
  • Characterizing ER activation is crucial for understanding AFL mechanisms.

Purpose of the Study:

  • To delineate activation patterns around the Eustachian ridge (ER) during typical atrial flutter (AFL).
  • To evaluate conduction through the ER using high-resolution noncontact mapping.

Main Methods:

  • Studied 53 patients with typical AFL using high-resolution noncontact mapping.
  • Assessed ER conduction during AFL and coronary sinus (CS) pacing.

Main Results:

  • Identified three activation patterns around the ER.
  • Type I: Blocked conduction at ER during AFL and CS pacing.
  • Type II: Blocked at ER during AFL, but conducted during CS pacing.
  • Type III: Activation along ER during AFL; conduction through ER during CS pacing.

Conclusions:

  • First demonstration of three distinct ER activation patterns during AFL and CS pacing.
  • Suggests the Eustachian ridge functions as an important anatomic and functional barrier in typical AFL.