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Related Concept Videos

Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

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The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase...
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Mechanism of Cardiac Arrhythmias01:28

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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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Development of the Heart01:27

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The development of the human heart, a crucial organ, commences from the mesoderm on the 18th or 19th day after fertilization. This process initiates in the cardiogenic area, a group of mesodermal cells at the embryo's head end, which evolves into elongated strands known as cardiogenic cords. These cords undergo a transformation to form hollow-centered endocardial tubes.
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Conduction System of the Heart01:19

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Autorhythmicity is a term that refers to the heart's inherent ability to generate electrical signals and instigate muscle contractions. This self-regulating conduction system within the heart consists of two key components: the pacemaker cells and specialized conducting cells.
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Conduction System of the Heart01:20

Conduction System of the Heart

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The cardiac conduction system produces and transmits electrical impulses that prompt myocardial contraction, ensuring efficient heart function. This intricate system ensures that the heart beats in a coordinated and efficient manner, beginning with the atria and then the ventricles. The conduction system optimizes cardiac output by maintaining this precise sequence, which is crucial for adequate blood circulation.
This system relies on the unique properties of nodal and Purkinje cells:...
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Correlation between ECG and Cardiac Cycle01:25

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The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
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Isolation of Atrial Myocytes from Adult Mice
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Erbb2 is required for cardiac atrial electrical activity during development.

Gennadiy Tenin1, Christopher Clowes1, Kathryn Wolton1

  • 1Faculty of Life Sciences, University of Manchester, Manchester, United Kingdom.

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A new mouse model with an Erbb2 gene mutation reveals its critical role in atrial electrical conduction during embryonic development, preventing heart defects and ensuring embryo survival.

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Area of Science:

  • Cardiovascular Biology
  • Developmental Biology
  • Genetics

Background:

  • The heart's electrical system, including the sinoatrial node (SAN) and conduction system, is vital for embryonic survival.
  • The Erbb2 (Epidermal Growth Factor Receptor 2) gene is essential for embryonic development, with homozygous knockouts causing embryonic lethality by E10.5 due to cardiac defects.

Purpose of the Study:

  • To investigate the function of Erbb2 in cardiac conduction system development.
  • To characterize a novel hypomorphic Erbb2 mutation (l11Jus8) and its impact on embryonic heart development.

Main Methods:

  • Isolation and characterization of the l11Jus8 mouse mutant line from a chemical mutagenesis screen.
  • Phenotypic analysis of homozygous l11Jus8 mutant embryos, including assessment of cardiac function and electrical conduction.

Main Results:

  • Homozygous l11Jus8 mutant embryos exhibit embryonic lethality between E12.5-13, displaying cardiac hemorrhage.
  • Mutants show impaired atrial function due to defects in electrical signal propagation, resulting in an atrial-specific conduction block.
  • The l11Jus8 phenotype is distinct from previously reported Erbb2 knockout phenotypes.

Conclusions:

  • The l11Jus8 mouse model uncovers a novel role for Erbb2 in the development of the atrial conduction system.
  • Disruption of Erbb2 function in atrial conduction leads to mid-gestation embryonic lethality.