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Related Concept Videos

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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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.
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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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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Cardiac Action Potential01:30

Cardiac Action Potential

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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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Dysrhythmias I: Introduction01:15

Dysrhythmias I: Introduction

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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...
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Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

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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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Related Experiment Video

Updated: Dec 12, 2025

Impact of Intracardiac Neurons on Cardiac Electrophysiology and Arrhythmogenesis in an Ex Vivo Langendorff System
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Dissecting the Cardiac Conduction System: Is It Worthwhile?

Serena Y Tan1, Michael K Fritsch2, Steven White3

  • 1Department of Pathology and Laboratory Medicine, Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois.

Pediatric and Developmental Pathology : the Official Journal of the Society for Pediatric Pathology and the Paediatric Pathology Society
|August 7, 2020
PubMed
Summary
This summary is machine-generated.

Pathologic examination of the cardiac conduction system (CS) reveals abnormalities in most pediatric sudden death and arrhythmia cases. These CS changes, sometimes unique, offer crucial diagnostic insights.

Keywords:
arrhythmiaatrioventricular nodebundle of Hischannelopathyconduction systemsinoatrial nodesudden death

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Area of Science:

  • Cardiovascular Pathology
  • Pediatric Cardiology
  • Forensic Pathology

Background:

  • Cardiac conduction system (CS) examination is not standard practice.
  • Histologic changes in CS are primarily documented in forensic contexts.

Purpose of the Study:

  • To evaluate the diagnostic value of CS dissection in pediatric cases.
  • To investigate CS abnormalities in unexplained sudden death and severe arrhythmias.

Main Methods:

  • Studied a cohort of pediatric patients with unexplained sudden death or severe arrhythmias.
  • Performed histopathologic examination of CS components.
  • Correlated CS findings with other cardiac structures.

Main Results:

  • 86% of subjects (21 pediatric cases) showed CS pathologic abnormalities.
  • 62% of CS findings mirrored abnormalities in other cardiac sections.
  • 24% of cases had CS-specific abnormalities, potentially explaining outcomes.

Conclusions:

  • High prevalence of CS pathologic changes in pediatric sudden death/arrhythmia cases.
  • CS findings frequently correlate with broader cardiac pathology.
  • Systematic CS dissection is valuable, revealing unique abnormalities that may explain clinical events.