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Related Concept Videos

Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

Dysrhythmias, also known as arrhythmias, are disturbances in the heart's rhythm that range from benign to life-threatening. A thorough evaluation is crucial for appropriate management and involves a comprehensive medical history, physical examination, and various diagnostic tests.Medical HistorySymptoms: Collect detailed information on palpitations, dizziness, syncope, chest pain, and fatigue. Note their onset, frequency, and triggers.Previous Cardiac Issues: Document any history of heart...
Genetic Screens02:46

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Genetic screens are tools used to identify genes and mutations responsible for phenotypes of interest. Genetic screens help identify individuals or a group of people at risk of developing  genetic diseases and help them with early intervention, targeted therapy, and reproductive options.
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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.
Cardiomyopathy III: Hypertrophic Cardiomyopathy01:29

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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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Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation
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Mutation screening for the genes causing cardiac arrhythmias.

Jeffrey A Towbin1

  • 1Pediatric Cardiology, Texas Children's Hospital, Houston, TX, USA.

Methods in Molecular Medicine
|August 26, 2006
PubMed
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This chapter details the molecular underpinnings of heart arrhythmia disorders like long QT syndrome (LQTS) and Brugada syndrome. Advances in genetic analysis and mutation screening methods are discussed, enhancing our understanding of these conditions.

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Area of Science:

  • Cardiovascular Genetics
  • Molecular Cardiology

Background:

  • Arrhythmias, such as long QT syndrome (LQTS), Brugada syndrome, and polymorphic ventricular tachycardia, have significant molecular bases.
  • Understanding these molecular mechanisms is crucial for diagnosing and managing cardiac rhythm disorders.

Purpose of the Study:

  • To outline the current understanding of the molecular basis of inherited arrhythmia disorders.
  • To describe contemporary genetic analysis and mutation screening techniques used in this field.

Main Methods:

  • Genetic linkage analysis, gene cloning, and mutation analyses were historically used.
  • Current mutation screening methods include denaturing high-performance liquid chromatography (DHPLC) and DNA sequencing.
  • The Human Genome Project has reduced the need for traditional gene cloning.

Main Results:

  • Several key genes responsible for LQTS, Brugada syndrome, and polymorphic ventricular tachycardia have been identified.
  • Established mutation screening methods allow for comprehensive analysis of genetic variations.
  • Significant knowledge has been gained regarding the genetic etiology of these arrhythmias.

Conclusions:

  • The molecular basis of several inherited arrhythmia syndromes is well-characterized.
  • Modern genetic screening techniques are essential for identifying disease-causing mutations.
  • Continued research into the molecular genetics of arrhythmias will improve patient outcomes.