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Lower loop re-entrant flutter.

Anish Bhargav1, Ramanathan Velayutham1, Raja J Selvaraj1

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Journal of Arrhythmia
|May 2, 2025
PubMed
Summary
This summary is machine-generated.

This study explains how prior heart attacks can cause complex atrial flutter by creating scar tissue. Ablation successfully treated this flutter by targeting slow conduction pathways in the right atrium.

Keywords:
Lower loop reentrycounterclockwise fluttercrista terminalis

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Imaging

Background:

  • Atrial flutter can arise from complex atrial remodeling.
  • Inferior wall myocardial infarction can lead to atrial scarring and arrhythmias.
  • Atypical right atrial flutter requires precise mapping for successful ablation.

Purpose of the Study:

  • To investigate the mechanism of atypical right atrial flutter in a patient with prior myocardial infarction.
  • To demonstrate the utility of electroanatomic mapping in guiding ablation for complex atrial arrhythmias.
  • To correlate ECG findings with electrophysiologic substrate.

Main Methods:

  • Electroanatomic mapping of the right atrium.
  • Radiofrequency ablation guided by mapping data.
  • 12-lead electrocardiogram (ECG) analysis.

Main Results:

  • Diffuse right atrial scarring was identified, consistent with atrial infarction from a prior inferior myocardial infarction.
  • Slow conduction at the lower crista terminalis was a critical isthmus for counterclockwise reentry around the inferior vena cava.
  • Ablation targeting this slow conduction pathway successfully terminated the atrial flutter.

Conclusions:

  • Prior myocardial infarction can induce significant atrial remodeling and substrate for complex atrial flutter.
  • Electroanatomic mapping is crucial for identifying critical isthmuses in scar-mediated atrial flutter.
  • Targeted ablation of slow conduction zones can effectively treat atypical right atrial flutter.