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Related Concept Videos

Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

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Dysrhythmias, also known as arrhythmias, are irregular heart rhythms that result from abnormal electrical activity in the heart, affecting its ability to circulate blood efficiently. Tachyarrhythmias, a subset of dysrhythmias, are characterized by abnormally fast heart rates exceeding 100 beats per minute. Here are some types of tachyarrhythmias with their distinct ECG features:Sinus Tachycardia:Sinus tachycardia presents a regular heart rhythm with an increased rate of 101-180 beats per...
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ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

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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: Jul 24, 2025

High-Resolution Endocardial and Epicardial Optical Mapping in a Sheep Model of Stretch-Induced Atrial Fibrillation
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Differences between typical and reverse typical atrial flutter identified by ultrahigh resolution mapping.

Satoshi Hara1, Yoshikazu Sato1, Shigeki Kusa1

  • 1Cardiovascular Center, Tsuchiura Kyodo Hospital, Tsuchiura, Japan.

Journal of Cardiovascular Electrophysiology
|July 2, 2023
PubMed
Summary
This summary is machine-generated.

This study reveals distinct electrical conduction patterns in typical atrial flutter (t-AFL) versus reverse typical atrial flutter (rt-AFL). Understanding these differences in right atrial circuits is key for targeted ablation strategies.

Keywords:
3D-mappingatrial flutterreversed typicaltypical

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Imaging

Background:

  • Atrial flutter (AFL) is a common arrhythmia involving macro-reentrant tachycardia around the tricuspid annulus.
  • The specific factors differentiating typical AFL (t-AFL) from reverse typical AFL (rt-AFL) remain unclear.

Purpose of the Study:

  • To investigate the distinct electrophysiological and anatomical characteristics of t-AFL and rt-AFL circuits.
  • To differentiate the reentrant pathways using ultrahigh-resolution mapping of the right atrium.

Main Methods:

  • Thirty patients with isthmus-dependent AFL undergoing cavo-tricuspid isthmus (CTI) ablation were studied.
  • Patients were categorized into t-AFL (22) and rt-AFL (8) groups.
  • Ultrahigh-resolution mapping and comparison of reentrant circuit anatomy and electrophysiology were performed.

Main Results:

  • No significant differences were found in baseline characteristics, antiarrhythmic drug use, atrial fibrillation prevalence, AFL cycle length, or CTI length between groups.
  • Functional block occurred in 100% of t-AFL patients versus 62.5% of rt-AFL patients at the crista terminalis or sinus venosus (p < .05).
  • Slow conduction zones were prevalent at the intra-atrial septum in t-AFL and at the CTI in rt-AFL.

Conclusions:

  • Ultrahigh-resolution mapping identified significant differences in right atrial and tricuspid valve conduction properties between t-AFL and rt-AFL.
  • These findings suggest distinct directional mechanisms underlying typical and reverse typical atrial flutter.