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Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...
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Related Experiment Video

Updated: Mar 8, 2026

Ablation of Ischemic Ventricular Tachycardia Using a Multipolar Catheter and 3-dimensional Mapping System for High-density Electro-anatomical Reconstruction
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Junctional Ectopic Tachycardia Localization and Procedural Approach using Cryoablation.

Alyson R Pierick1, Ian H Law1, Jennifer R Muldonado1

  • 1Department of Pediatrics, University of Iowa Children's Hospital, Iowa City, Iowa.

Pacing and Clinical Electrophysiology : PACE
|January 19, 2017
PubMed
Summary

Cryoablation using 3D mapping safely treats idiopathic junctional ectopic tachycardia (JET) in most patients. Successful ablation of the ectopic focus in the lower triangle of Koch (TOK) is key for long-term success.

Keywords:
3D mappingcatheter ablationjunctional ectopic tachycardiapediatric

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Area of Science:

  • Electrophysiology
  • Pediatric Cardiology
  • Cardiac Ablation

Background:

  • Idiopathic junctional ectopic tachycardia (JET) presents challenges in antiarrhythmic therapy and carries risks with transcatheter ablation.
  • Unintended atrioventricular block is a significant concern during ablation procedures for JET.

Purpose of the Study:

  • To detail the procedural technique and outcomes of 3D-guided cryoablation for treating JET.
  • To identify the optimal location for successful cryoablation of JET foci.

Main Methods:

  • Retrospective analysis of 13 patients undergoing cryothermal ablation for JET.
  • Utilized 3D mapping to guide cryoablation and evaluated procedural characteristics and long-term outcomes.

Main Results:

  • Successful ablation of the ectopic focus was achieved in 11 out of 13 patients, primarily within the lower two-thirds of the triangle of Koch (TOK).
  • Ablations outside this region were linked to longer procedures, increased lesion count, and higher recurrence rates.
  • No complications were reported during the procedures.

Conclusions:

  • Cryotherapy is a safe and effective method for ablating JET in the majority of pediatric patients.
  • Targeting foci within the lower two-thirds of the TOK is crucial for achieving successful and durable outcomes in JET cryoablation.