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Atrial flutter update.

Francisco G Cosío1

  • 1Chief Cardiology Service, Hospital Universitario de Getafe, Madrid, Spain. fcosio@vitanet.nu

Cardiac Electrophysiology Review
|November 20, 2002
PubMed
Summary

Typical atrial flutter ablation targets the isthmus, but atrial fibrillation remains a concern. Further research into myocardial abnormalities is needed to improve long-term outcomes for patients with typical atrial flutter.

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[Different evolution of atrial fibrillation after the first documented episode].

Medicina clinica·2015

Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Anatomy

Background:

  • Typical atrial flutter is a reentrant arrhythmia involving the right atrium.
  • Understanding the anatomical circuit, particularly the role of anisotropic conduction and functional block, is key.
  • The inferior vena cava-tricuspid ring isthmus is a critical component of the flutter circuit.

Purpose of the Study:

  • To elucidate the anatomical structure of the typical atrial flutter circuit.
  • To detail the established ablation techniques targeting the isthmus.
  • To highlight the long-term prognostic implications, including atrial fibrillation incidence.

Main Methods:

  • Understanding anisotropic conduction at the terminal crest to define the posterior boundary.
  • Identifying the tricuspid ring as the anterior boundary.
  • Targeting the inferior vena cava-tricuspid ring isthmus for ablation and assessing bidirectional block via pacing and electrograms.

Main Results:

  • The flutter circuit is defined by the terminal crest, vena cava orifices, tricuspid ring, and atrial walls.
  • Isthmus ablation aims for complete, bidirectional block.
  • Successful ablation prevents flutter recurrence but a significant incidence of atrial fibrillation persists.

Conclusions:

  • Isthmus ablation is effective for typical atrial flutter but does not fully address long-term atrial fibrillation risk.
  • Further investigation into underlying myocardial abnormalities is crucial for improving patient prognosis.
  • Enhanced understanding of atrial electrophysiology is necessary to optimize treatment strategies.

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