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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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Dysrhythmias II: Classification of Tachyarrhythmias01:28

Dysrhythmias II: Classification of Tachyarrhythmias

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Tachyarrhythmias are a type of dysrhythmia where the heart rate exceeds 100 beats per minute. Here are some common types of tachyarrhythmias:Sinus TachycardiaSinus tachycardia originates from increased impulses from the sinus node, leading to an elevated heart rate. It is often triggered by stress, fever, or exercise.Patients may experience palpitations, a sensation of a racing heart, dizziness, and chest discomfort.Causes and Risk Factors: Common causes include physical exertion, emotional...
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Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
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Disturbances in Heart Rhythm01:28

Disturbances in Heart Rhythm

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Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow...
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Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

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Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
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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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Tachycardia-Induced Cardiomyopathy As a Chronic Heart Failure Model in Swine
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Bidirectional rotating biatrial tachycardia.

Koichiro Yamaoka1, Tomoyuki Arai1, Masao Takahashi1

  • 1Department of Cardiology Tokyo Metropolitan Hiroo Hospital Tokyo Japan.

Journal of Arrhythmia
|October 6, 2023
PubMed
Summary

Recurrent atrial tachycardia (AT) in a patient was successfully treated with ablation. Two distinct bi-atrial tachycardia circuits were identified, rotating in opposite directions, and ablation resolved the condition.

Keywords:
ablationatrial tachycardiabiatrial tachycardiabidirectional rotationepicardium

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Ablation

Background:

  • Recurrent atrial tachycardia (AT) poses a challenge in clinical practice.
  • Identifying the specific mechanisms and circuits of AT is crucial for effective treatment.

Purpose of the Study:

  • To describe a case of recurrent atrial tachycardia with unique, oppositely rotating circuits.
  • To evaluate the efficacy of ablation in resolving this complex arrhythmia.

Main Methods:

  • Diagnosis of bi-atrial tachycardia (bi-AT) using activation mapping and postpacing interval measurements.
  • Electrophysiological study to identify tachycardia circuits.
  • Radiofrequency ablation targeting the anteroseptal wall of the left atrium.

Main Results:

  • Two distinct bi-ATs were identified, sharing identical circuits but rotating in opposite directions.
  • Ablation of the left atrial anteroseptal wall successfully terminated the ongoing AT.
  • The AT was no longer inducible after the ablation procedure.

Conclusions:

  • Complex atrial tachycardia mechanisms, including oppositely rotating circuits, can occur.
  • Targeted ablation in the left atrial anteroseptal region can be effective for treating such complex AT.
  • Successful ablation provides a potential therapeutic strategy for challenging atrial arrhythmias.