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Related Concept Videos

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...
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:...
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...
Cardiomyopathy III: Hypertrophic Cardiomyopathy01:29

Cardiomyopathy III: Hypertrophic Cardiomyopathy

Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
Cardiomyopathy II: Dilated Cardiomyopathy01:30

Cardiomyopathy II: Dilated Cardiomyopathy

Dilated cardiomyopathy, or DCM, is a progressive myocardial disorder characterized by ventricular chamber dilation and contractile dysfunction.EtiologyVarious factors can cause DCM, including hypertension and heavy alcohol intake, which contribute to the weakening and enlargement of the heart muscle. Viral infections, such as Coxsackievirus B, adenoviruses, and influenza, can lead to DCM by causing inflammation and damage to heart tissue. Certain chemotherapeutic agents, including daunorubicin,...
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.

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Related Experiment Video

Updated: Jun 30, 2026

Preclinical Cardiac Electrophysiology Assessment by Dual Voltage and Calcium Optical Mapping of Human Organotypic Cardiac Slices
09:35

Preclinical Cardiac Electrophysiology Assessment by Dual Voltage and Calcium Optical Mapping of Human Organotypic Cardiac Slices

Published on: June 16, 2020

Current Topics of Progressive Cardiac Conduction Disease.

Naokata Sumitomo1, Hitoshi Mori2, Takashi Kumamoto3

  • 1Department of Pediatric Cardiology Saitama Medical University International Medical Center Saitama Japan.

Journal of Arrhythmia
|June 29, 2026
PubMed
Summary
This summary is machine-generated.

Progressive cardiac conduction disease (PCCD) is a rare genetic disorder. This review details its genetic causes, clinical features, and management strategies for better patient outcomes.

Keywords:
implantable cardioverter defibrillatorinherited arrhythmiapacemaker implantationprogressive cardiac conduction diseasesudden cardiac death

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Area of Science:

  • Cardiology
  • Genetics
  • Medical Genetics

Background:

  • Progressive cardiac conduction disease (PCCD) is a rare inheritable condition affecting the heart's electrical system.
  • It can lead to severe outcomes like complete heart block, syncope, and sudden cardiac death.
  • The estimated incidence of PCCD is 0.0005% per year.

Purpose of the Study:

  • To provide a clinically relevant overview of PCCD.
  • To emphasize the genetic basis and phenotypic expression of various PCCD forms.
  • To propose a practical classification for diagnosis, risk stratification, and patient management.

Main Methods:

  • This is a review article, synthesizing existing research on PCCD.
  • It focuses on genetic associations, including ion channel, gap junction, myopathy, transcription factor, metabolic, and mitochondrial genes.
  • Clinical implications for diagnosis and management are discussed.

Main Results:

  • Numerous genes have been linked to PCCD development, including SCN5A, LMNA, NKX2-5, and PRKAG2.
  • PCCD presents with diverse genetic underpinnings and phenotypic expressions.
  • Pacemaker implantation is the primary treatment, with implantable cardioverter defibrillators considered for specific cases.

Conclusions:

  • Understanding the genetic basis of PCCD is crucial for accurate diagnosis and risk stratification.
  • A proposed classification system can aid in managing isolated and associated forms of PCCD.
  • Further research into genetic variants and their clinical impact will refine patient management strategies.