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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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Conduction System of the Heart01:19

Conduction System of the Heart

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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.
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...
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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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Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

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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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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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Regulation of Heart Rates01:31

Regulation of Heart Rates

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The regulation of heart rate is a complex process controlled by the autonomic nervous system (ANS), hormonal influences, and intrinsic cardiac mechanisms. The ANS has two main components: the sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS).
The SNS increases heart rate through the release of norepinephrine and epinephrine, which act on beta-1 adrenergic receptors in the heart. This action increases the rate of depolarization in the sinoatrial (SA) node, the heart's...
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Location, Dissection, and Analysis of the Murine Stellate Ganglion
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Cardiac autonomic nerve distribution and arrhythmia.

Quan Liu1, Dongmei Chen1, Yonggang Wang1

  • 1Department of Cardiovascular Disease, the First Hospital of Jilin University, Changchun 130021, Jilin Province, China.

Neural Regeneration Research
|October 16, 2014
PubMed
Summary

The uneven distribution of cardiac autonomic nerves, particularly in the atria and pulmonary veins, is a primary cause of arrhythmia. These nerves significantly influence the development and symptoms of cardiac rhythm disorders.

Keywords:
acetylcholineacetylcholine transferaseadrenergic receptorarrhythmiacardiac autonomic nervecatecholaminemuscarinic M receptornorepinephrineparasympathetic nervesympathetic nervetyrosine hydroxylasevagus nerve

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Area of Science:

  • Cardiology and Neuroscience
  • Autonomic Nervous System Research

Background:

  • Cardiac autonomic nerves regulate heart function.
  • Abnormalities in their distribution are implicated in cardiac arrhythmias.

Purpose of the Study:

  • To analyze the distribution patterns of cardiac autonomic nerves.
  • To investigate the relationship between cardiac autonomic nerve distribution and arrhythmia.

Main Methods:

  • Systematic literature review of 165 studies, with 46 included.
  • Immunohistochemical staining using tyrosine hydroxylase and acetylcholine transferase markers.
  • Computer-aided morphometric analysis of nerve distribution density.

Main Results:

  • Cardiac autonomic nerves show a disordered distribution, concentrated on the atrial surface and pulmonary veins.
  • Distribution is prominent proximally, superiorly, leftward, epicardially, and posteriorly.
  • Tyrosine hydroxylase and acetylcholine transferase are key markers for nerve distribution.

Conclusions:

  • Uneven cardiac autonomic nerve distribution is a leading cause of arrhythmia.
  • Cardiac autonomic nerves play a critical role in the occurrence, maintenance, and symptoms of arrhythmia.