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Related Concept Videos

Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

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 minute.
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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

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...
Dysrhythmias II: Classification of Tachyarrhythmias01:28

Dysrhythmias II: Classification of Tachyarrhythmias

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...
Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

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.
Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

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...
Cardiomyopathy I: Introduction and Classification01:25

Cardiomyopathy I: Introduction and Classification

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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Dual-Dye Optical Mapping of Hearts from RyR2R2474S Knock-In Mice of Catecholaminergic Polymorphic Ventricular Tachycardia
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Catecholaminergic polymorphic ventricular tachycardia: a current overview.

Luiz R Leite1, Benhur D Henz, Paula G Macedo

  • 1Grupo de Estudos em Arritmias Cardíacas/Fibrilação Atrial, Brasília DF, SMDB Conj., 16 Lote 5 Casa 1, Brasília 71680-160, DF, Brazil. leite.luiz@brturbo.com.br

Future Cardiology
|April 18, 2009
PubMed
Summary
This summary is machine-generated.

Catecholaminergic polymorphic ventricular tachycardia (CPVT) is a genetic heart condition causing syncope and sudden death in young people. Early diagnosis and risk stratification are crucial for managing this potentially fatal arrhythmia.

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Area of Science:

  • Cardiology
  • Genetics
  • Pediatrics

Background:

  • Catecholaminergic polymorphic ventricular tachycardia (CPVT) is a life-threatening inherited arrhythmia.
  • It affects young, otherwise healthy individuals, leading to syncope and sudden cardiac death.
  • Genetic mutations, particularly in chromosome 1 genes like the ryanodine receptor and calsequestrin, underlie CPVT.

Observation:

  • The hallmark presentation is exercise- or emotion-induced syncope in children and adolescents.
  • Diagnostic features include polymorphic ventricular tachycardia during treadmill testing or isoproterenol challenge.
  • Absence of structural heart disease is typical in affected individuals.

Findings:

  • CPVT is a familial disease with 50% of cases arising from de novo mutations.
  • Key genes involved are the ryanodine receptor (RYR2) and calsequestrin (CASQ2).
  • Risk stratification remains challenging, but family history of sudden cardiac death and early symptom onset are significant predictors.

Implications:

  • Effective management strategies include beta-blockers, calcium-channel blockers, and implantable cardioverter-defibrillators for high-risk patients.
  • Improved understanding of genetic underpinnings aids in diagnosis and family screening.
  • Further research is needed to refine risk stratification and optimize therapeutic approaches for CPVT.