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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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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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Disturbances in Heart Rhythm01:29

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 heart...
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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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Cardiomyopathy I: Introduction and Classification01:25

Cardiomyopathy I: Introduction and Classification

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Cardiomyopathy, or CMP, is a group of diseases affecting the myocardial structure, impairing its ability to pump blood effectively. This condition can lead to arrhythmias, heart failure, or sudden cardiac death.Cardiomyopathies are classified into primary and secondary categories:Primary Cardiomyopathy refers to conditions involving only the heart muscle that are often idiopathic (of unknown cause) or genetic. They primarily affect the myocardium without the involvement of other systemic...
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Updated: Aug 14, 2025

Dual-Dye Optical Mapping of Hearts from RyR2R2474S Knock-In Mice of Catecholaminergic Polymorphic Ventricular Tachycardia
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Dual-Dye Optical Mapping of Hearts from RyR2R2474S Knock-In Mice of Catecholaminergic Polymorphic Ventricular Tachycardia

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Catecholaminergic Polymorphic Ventricular Tachycardia.

Mohamed Abbas1, Chris Miles2, Elijah Behr2

  • 1Department of Cardiology, Royal Stoke University Hospital, Stoke-on-Trent, UK.

Arrhythmia & Electrophysiology Review
|January 16, 2023
PubMed
Summary
This summary is machine-generated.

Catecholaminergic polymorphic ventricular tachycardia (CPVT) is an inherited arrhythmia causing sudden death. This review covers CPVT

Keywords:
catecholaminergic polymorphic ventricular tachycardiaflecainideleft cardiac sympathetic denervationryanodine receptor mutationsudden cardiac deathβ-blockers

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Area of Science:

  • Cardiology
  • Genetics
  • Electrophysiology

Background:

  • Catecholaminergic polymorphic ventricular tachycardia (CPVT) is an inherited arrhythmia syndrome.
  • Characterized by adrenergic-mediated bidirectional and/or polymorphic ventricular tachycardia.
  • A significant cause of sudden death in children and adolescents, also affecting adults.

Purpose of the Study:

  • To summarize clinical characteristics, genetics, and diagnostic strategies for CPVT.
  • To review current and emerging therapeutic approaches for CPVT.
  • To highlight recent advances and challenges in managing CPVT.

Main Methods:

  • Literature review of clinical studies, genetic research, and therapeutic trials.
  • Analysis of diagnostic criteria and risk stratification methods.
  • Evaluation of treatment efficacy, including beta-blockers, flecainide, and sympathetic denervation.

Main Results:

  • CPVT is often caused by variants in the cardiac ryanodine receptor gene.
  • Early identification and risk stratification are crucial.
  • Beta-blockers are primary therapy, with flecainide and sympathetic denervation playing important roles.

Conclusions:

  • CPVT management requires a multi-faceted approach.
  • Challenges remain regarding implantable cardioverter defibrillator efficacy and proarrhythmic risks.
  • Further research is needed to address current therapeutic limitations.