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Related Concept Videos

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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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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Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

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Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin...
887
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 Rhythm01:29

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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 heart...
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ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

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Arrhythmias are disturbances in the heart's rhythm that lead to abnormal heartbeats. These irregularities can originate from different parts of the heart and are classified based on their origin and nature.
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism,...
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J wave syndrome: Benign or malignant?

Alborz Sherafati1, Masoud Eslami2, Reza Mollazadeh2

  • 1Assistant Professor, Department of Cardiology, School of Medicine, Imam Khomeini Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran.

ARYA Atherosclerosis
|June 10, 2022
PubMed
Summary
This summary is machine-generated.

J wave syndrome, an electrical heart condition, involves early repolarization and can lead to sudden cardiac death or ventricular arrhythmias. Understanding its phenotypes, like Brugada syndrome, is crucial for diagnosis and treatment.

Keywords:
Brugada SyndromeSudden Cardiac DeathVentricular Tachycardia

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Genetics

Background:

  • J wave syndrome is an electrical heart disease characterized by pathological early repolarization.
  • It presents a spectrum from aborted sudden cardiac death due to ventricular arrhythmia (VA) in young patients to asymptomatic findings on electrocardiography.

Purpose of the Study:

  • To describe two patients with early repolarization and Brugada syndrome.
  • To comprehensively discuss the definition, epidemiology, genetics, cellular mechanisms, diagnosis, risk stratification, and therapeutic options for J wave syndrome.

Main Methods:

  • Case report of two patients presenting with early repolarization and Brugada syndrome.
  • Detailed review and discussion of existing literature on J wave syndrome and its phenotypes.

Main Results:

  • The study details the clinical presentation and diagnostic findings in the two presented cases.
  • A thorough overview of the current understanding of J wave syndrome, including its genetic basis and cellular mechanisms, is provided.

Conclusions:

  • J wave syndrome encompasses diverse clinical manifestations and genetic underpinnings.
  • Effective risk stratification and therapeutic strategies remain key challenges in managing this cardiac electrical disease.