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Related Experiment Videos

Activation patterns in the left atrium during counterclockwise and clockwise atrial flutter.

G Ndrepepa1, B Zrenner, S Weyerbrock

  • 1Deutsches Herzzentrum München, Klinikum rechts der Isar, Technische Universität München, Munich, Germany.

Journal of Cardiovascular Electrophysiology
|August 22, 2001
PubMed
Summary

This study reveals that the left atrium (LA) in patients with atrial flutter (AFL) is activated by two distinct wavefronts originating from the interatrial septum. These activation patterns differ based on whether the atrial flutter is counterclockwise or clockwise.

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Area of Science:

  • Electrophysiology
  • Cardiac Anatomy
  • Arrhythmology

Background:

  • Left atrial (LA) activation patterns in patients with isthmus-dependent right atrial flutter (AFL) remain understudied.
  • Understanding these patterns is crucial for effective ablation strategies.

Purpose of the Study:

  • To analyze and compare left atrial activation patterns in patients experiencing counterclockwise and clockwise AFL.
  • To elucidate the origin and propagation of electrical wavefronts within the LA during AFL.

Main Methods:

  • Utilized a 64-electrode basket catheter for detailed LA mapping in 12 patients with AFL and atrial fibrillation undergoing ablation.
  • Mapping was performed via transseptal approach or an open foramen ovale.
  • Analyzed activation times and identified earliest electrical breakthroughs.

Related Experiment Videos

Main Results:

  • In counterclockwise AFL (10 episodes), two distinct breakthroughs from the interatrial septum initiated LA activation, with two wavefronts propagating to anterior and posterior walls.
  • In clockwise AFL (5 episodes), breakthroughs occurred in high anteroseptal and low posteroseptal regions, with a dominant superior wavefront from the anterolateral region.
  • Mean LA activation times were comparable between counterclockwise (133+/-28 msec) and clockwise (130+/-13 msec) AFL.

Conclusions:

  • The left atrium in AFL patients is activated by two wavefronts originating from high anterior and low posterior interatrial septum regions.
  • The sequence of interatrial activation and LA conduction properties dictate the observed activation patterns.
  • Findings provide insights into the mechanisms underlying AFL and potential targets for catheter ablation.