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Conduction System of the Heart

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 Heart

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 Arrhythmias

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.

Dysrhythmias I: Introduction

Dysrhythmias I: Introduction

Dysrhythmias refers to abnormalities in the heart's rhythm. They result from disruptions in the heart's electrical conduction system, which includes the sinoatrial(SA)node, atrioventricular(AV) node, the bundle of His, bundle branches, and Purkinje fibers.Definition and PathophysiologyDysrhythmias result from disorders of impulse formation, impulse conduction, or both. The heart contains specialized cells in the sinoatrial node, atrioventricular node, and the bundle of His and Purkinje fibers...

Disturbances in Heart Rhythm

Disturbances in Heart Rhythm

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...

Cardiac Action Potential

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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A Pipeline to Characterize Structural Heart Defects in the Fetal Mouse

A Pipeline to Characterize Structural Heart Defects in the Fetal Mouse

Published on: December 16, 2022

Cardiac conduction defects.

Giulia Guerri¹, Geraldo Krasi, Vincenza Precone

¹MAGI's Lab, Rovereto (TN), Italy. giulia.guerri@assomagi.org.

Acta Bio-Medica : Atenei Parmensis

|October 3, 2019

Summary

This summary is machine-generated.

Genetic defects in cardiac ion channels cause primary heart conduction disorders, leading to arrhythmias and sudden cardiac death. This review focuses on these specific genetic causes, excluding drug-induced or secondary conditions.

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Echocardiographic Evaluation of Atrial Communications before Transcatheter Closure

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Area of Science:

Cardiology
Genetics
Molecular Biology

Background:

Cardiac electrical activity relies on precise impulse formation and conduction.
Defects in these processes can cause life-threatening arrhythmias.
Primary cardiac conduction defects are distinct from secondary causes like cardiomyopathies.

Purpose of the Study:

To review genetic disorders causing primary cardiac conduction defects.
To highlight the role of ion channel gene mutations.
To differentiate these primary defects from other cardiac conditions.

Main Methods:

Literature review of genetic disorders affecting cardiac conduction.
Focus on mutations within ion channel genes.
Exclusion of drug-induced and secondary conduction abnormalities.

Main Results:

Identified specific genetic disorders linked to primary cardiac conduction defects.
Emphasized mutations in ion channel genes as a primary cause.
Distinguished these primary genetic defects from secondary causes.

Conclusions:

Genetic mutations in ion channels are a key cause of primary cardiac conduction defects.
Understanding these genetic underpinnings is crucial for diagnosing and managing arrhythmias.
This knowledge aids in preventing sudden cardiac death from primary electrical disorders.