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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...
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...
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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Related Experiment Video

Updated: Jul 13, 2026

Generation of Murine Cardiac Pacemaker Cell Aggregates Based on ES-Cell-Programming in Combination with Myh6-Promoter-Selection
08:52

Generation of Murine Cardiac Pacemaker Cell Aggregates Based on ES-Cell-Programming in Combination with Myh6-Promoter-Selection

Published on: February 17, 2015

Biological pacemakers based on I(f).

Michael R Rosen1, Peter R Brink, Ira S Cohen

  • 1Department of Pharmacology, Center for Molecular Therapeutics, College of Physicians and Surgeons of Columbia University, New York, NY 10032, USA. mrr1@columbia.edu

Medical & Biological Engineering & Computing
|July 17, 2007
PubMed
Summary

Researchers explored biological pacemakers using gene and cell therapy to replace electronic devices. Adult human stem cells effectively created functional connections, showing promise for clinical testing of biological pacemakers.

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Related Experiment Videos

Last Updated: Jul 13, 2026

Generation of Murine Cardiac Pacemaker Cell Aggregates Based on ES-Cell-Programming in Combination with Myh6-Promoter-Selection
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Published on: February 17, 2015

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
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Area of Science:

  • Biomedical Engineering
  • Cardiology
  • Molecular Biology

Background:

  • Biological pacemakers offer an alternative to electronic devices.
  • Interest in biological pacemakers has grown since the 1990s.

Purpose of the Study:

  • To investigate the use of hyperpolarization-activated, cyclic nucleotide-gated (HCN) channel isoforms for biological pacemakers.
  • To evaluate gene and cell therapy approaches for creating functional biological pacemakers.

Main Methods:

  • Utilized HCN channel isoforms to generate the I(f) pacemaker current.
  • Employed gene and cell therapy strategies in animal models.
  • Investigated the use of adult human mesenchymal stem cells (hMSCs) as a platform.

Main Results:

  • Both gene and cell therapy approaches demonstrated effective biological pacemaker function for weeks in vivo.
  • hMSCs formed functional gap junctions with cardiac myocytes.
  • Pacemaker current propagation was effective and persistent.

Conclusions:

  • Biological pacemakers based on HCN channels are a promising strategy.
  • The use of hMSCs facilitates effective integration with native cardiac tissue.
  • These findings support the potential for clinical translation of biological pacemakers.