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Related Concept Videos

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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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 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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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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Cardiomyopathy III: Hypertrophic Cardiomyopathy01:29

Cardiomyopathy III: Hypertrophic Cardiomyopathy

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Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
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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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Inherited arrhythmia syndromes - Cardiogenetics.

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Managing rare inherited arrhythmia syndromes like long QT syndrome, Brugada syndrome, and catecholaminergic polymorphic ventricular tachycardia is challenging. This review offers current knowledge and clinical guidance for these cardiac channelopathies.

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Area of Science:

  • Cardiology
  • Genetics
  • Pharmacology

Background:

  • Inherited arrhythmia syndromes, including long QT syndrome, Brugada syndrome, and catecholaminergic polymorphic ventricular tachycardia, are rare cardiac channelopathies.
  • These conditions increase the risk of malignant arrhythmias and sudden cardiac death.
  • Current clinical management relies on expert opinions and small studies, with challenges in identifying high-risk patients.

Purpose of the Study:

  • To provide an overview of current knowledge on inherited arrhythmia syndromes.
  • To offer guidance for the clinical management of long QT syndrome, Brugada syndrome, and catecholaminergic polymorphic ventricular tachycardia.
  • To highlight gaps in understanding disease severity variability.

Main Methods:

  • This is a review article.
  • It synthesizes existing literature on inherited arrhythmia syndromes.
  • It discusses genetic and non-genetic factors influencing disease presentation.

Main Results:

  • Knowledge of these rare syndromes has advanced, but significant gaps remain.
  • Variability in disease severity, even within families, is not fully understood.
  • A combination of genetic variants, non-genetic factors, and genetic modifiers likely influences clinical phenotypes.

Conclusions:

  • Effective clinical management of these channelopathies requires further research.
  • Improved diagnostic tools and risk prediction models are needed.
  • Elucidating the causes of phenotypic variability is crucial for personalized patient care.