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Unusual results are those that have a very low chance of occurring. Unusual results can be identified using probabilities and the range rule of thumb. In problems involving probability, unusual results can be observed in 2 instances – an unusually high number of successes or an unusually low number of successes.
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Updated: May 17, 2025

Dissociation of the Confounding Influences of Expectancy and Integrative Difficulty Residing in Anomalous Sentences in Event-related Potential Studies
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Serendipitous Supernormality.

Behzad B Pavri1, Eitan Frankel1

  • 1Thomas Jefferson University Hospital, Philadelphia, Pennsylvania, USA.

Annals of Noninvasive Electrocardiology : the Official Journal of the International Society for Holter and Noninvasive Electrocardiology, Inc
|April 4, 2025
PubMed
Summary
This summary is machine-generated.

Ablation-refractory atrial flutter was treated with AV node modification. Pacing rate adjustments serendipitously controlled induced arrhythmias, demonstrating a novel therapeutic approach.

Keywords:
atrioventricular node ablationatypical atrial fluttersupernormal conduction

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Area of Science:

  • Electrophysiology
  • Cardiac Pacing
  • Arrhythmia Management

Background:

  • A patient with incessant, drug- and ablation-refractory symptomatic atypical atrial flutter underwent atrioventricular (AV) node modification to establish complete heart block.
  • This intervention was performed in the context of a previously implanted dual-chamber defibrillator for resuscitated cardiac arrest.

Observation:

  • The patient's dual-chamber defibrillator was programmed to VVIR mode at 85 beats per minute (bpm).
  • This pacing rate was serendipitously discovered to be a near-exact factorial of the patient's atypical atrial flutter rate (250-260 bpm).

Findings:

  • The specific pacing rate created a phenomenon where every sixth flutter wave coincided with the supernormal period.
  • This resulted in the emergence of fixed-coupled supraventricular bigeminy and trigeminy, despite complete heart block.
  • Modifying the pacing rate to 75 bpm successfully abolished these induced supraventricular arrhythmias.

Implications:

  • This case highlights a unique interaction between atrial flutter, complete heart block, and pacemaker programming.
  • It suggests that precise pacemaker rate adjustments can be leveraged to manage complex, refractory supraventricular arrhythmias.
  • The findings offer potential insights into novel therapeutic strategies for managing challenging cardiac rhythm disorders.