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Related Concept Videos

Conduction System of the Heart01:20

Conduction System of the Heart

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:...
Conduction System of the Heart01:19

Conduction System of the Heart

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.
The pacemaker cells are located in two primary nodes: the sinoatrial (SA) node and the atrioventricular (AV) node. The SA node pacemaker cells can autonomously depolarize, triggering an action potential that leads to the...
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.
Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

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 of...
Pathophysiology of Cardiac Performance01:29

Pathophysiology of Cardiac Performance

Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
Cardiac Action Potential01:30

Cardiac Action Potential

Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials

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High Efficiency Differentiation of Human Pluripotent Stem Cells to Cardiomyocytes and Characterization by Flow Cytometry
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The emerging genetic landscape underlying cardiac conduction system function.

David E Arnolds1, Alison Chu, Elizabeth M McNally

  • 1Departments of Pediatrics and Pathology,The University of Chicago, 900 East 57th Street, Chicago, IL 60637, USA.

Birth Defects Research. Part A, Clinical and Molecular Teratology
|May 4, 2011
PubMed
Summary
This summary is machine-generated.

The cardiac conduction system (CCS) is vital for survival. Genetic studies link ECG variations to CCS function, revealing new insights into heart rhythm regulation.

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Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation
07:15

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Published on: January 16, 2019

Area of Science:

  • Cardiology
  • Genetics
  • Developmental Biology

Background:

  • The Cardiac Conduction System (CCS) is crucial for heart function across species.
  • Electrocardiogram (ECG) data provides insights into cardiovascular health in normal and diseased states.
  • Genome-wide association studies (GWAS) combined with ECG data are identifying genetic influences on CCS function.

Purpose of the Study:

  • To review recent advancements in understanding the genetic basis of Cardiac Conduction System (CCS) function.
  • To highlight novel genetic loci associated with ECG variability.
  • To explore the connection between developmental genes and CCS functional variation.

Main Methods:

  • Review of recent scientific literature.
  • Analysis of genome-wide association studies (GWAS) data.
  • Integration of electrocardiogram (ECG) and echocardiogram data.

Main Results:

  • Identification of novel genetic loci affecting CCS function.
  • Confirmation of the role of previously identified genes in CCS regulation.
  • Exploration of links between developmental genes and CCS variability.

Conclusions:

  • Genetic factors significantly influence Cardiac Conduction System (CCS) function.
  • Understanding these genetic links is key for diagnosing and treating cardiac arrhythmias.
  • Further research into developmental genes may uncover new therapeutic targets for cardiovascular diseases.