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Catheter ablation of atrial flutter
1Department of Cardiology, University of Leipzig, Heart Center, Germany. Kotth@medizin.uni-leipzig.de
The Thoracic and Cardiovascular Surgeon
|October 16, 1999
Summary
Curative treatment for typical atrial flutter involves creating a continuous lesion line in the right atrial isthmus. Proving complete conduction block, not just non-inducibility, significantly reduces flutter recurrence.
Area of Science:
- Cardiology
- Electrophysiology
- Cardiac Anatomy
Background:
- Typical atrial flutter is sustained by a macro-reentrant circuit within the right atrium.
- The critical zone for flutter maintenance is the isthmus between the tricuspid annulus and the inferior vena cava ostium.
Purpose of the Study:
- To evaluate the efficacy of anatomical ablation targeting the isthmus for typical atrial flutter.
- To compare electrophysiological criteria for assessing conduction block post-ablation.
Main Methods:
- Anatomically guided radiofrequency ablation creating a transmural lesion line across the isthmus.
- Electrophysiological assessment using double potentials along the ablation line to confirm bidirectional block.
- Utilizing electro-anatomical mapping to potentially reduce fluoroscopy time.
Main Results:
- Complete bidirectional isthmus conduction block, confirmed by double potentials, is superior to non-inducibility in preventing flutter recurrence.
- Electro-anatomical mapping aids in reducing fluoroscopy duration during isthmus ablation procedures.
Conclusions:
- Transmural ablation of the isthmus is a curative treatment for typical atrial flutter.
- Confirmation of complete bidirectional block via double potentials is crucial for long-term success and reduced recurrence rates.