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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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Related Experiment Video

Updated: Mar 23, 2026

Isolation and Functional Characterization of Human Ventricular Cardiomyocytes from Fresh Surgical Samples

Isolation and Functional Characterization of Human Ventricular Cardiomyocytes from Fresh Surgical Samples

Published on: April 21, 2014

Pacemaker Created in Human Ventricle by Depressing Inward-Rectifier K⁺ Current: A Simulation Study.

Yue Zhang¹, Kuanquan Wang¹, Qince Li¹

¹Biocomputing Research Center, School of Computer Science and Technology, Harbin Institute of Technology, Harbin 150001, China.

Biomed Research International

|March 22, 2016

Summary

This summary is machine-generated.

Biopacemakers derived from ventricular myocytes show potential to treat cardiac conduction disorders. Their rhythm stability and driving capability depend on size and spatial distribution, offering a promising alternative to electronic pacemakers.

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Last Updated: Mar 23, 2026

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Isolation of Human Atrial Myocytes for Simultaneous Measurements of Ca2+ Transients and Membrane Currents

Isolation of Human Atrial Myocytes for Simultaneous Measurements of Ca2+ Transients and Membrane Currents

Published on: July 3, 2013

Area of Science:

Biomedical Engineering
Cardiology
Computational Biology

Background:

Cardiac conduction disorders are prevalent, leading to slow heart rate and syncope.
Current treatments involve electronic pacemakers with limitations like battery life and infection risk.
Biopacemakers are being developed as a potential alternative to electronic devices.

Purpose of the Study:

To create and analyze a 2D model of a human biopacemaker using ventricular myocytes.
To assess the stability and pacing capabilities of the biopacemaker.
To determine optimal size and spatial distribution for effective pacing of surrounding cardiomyocytes.

Main Methods:

Development of a 2D computational model of human ventricular endocardial myocytes.
Simulation of pacemaker activity by modulating the inward-rectifier K(+) current (I K1).
Analysis of biopacemaker stability and driving capacity based on size and spatial arrangement.

Main Results:

The biopacemaker's rhythm stabilized to a state similar to single ventricular myocytes.
The driving force of the biopacemaker was significantly influenced by its spatial distribution pattern.
The study identified key factors for robust pacing and driving of quiescent cardiomyocytes.

Conclusions:

A 2D model of a human biopacemaker was successfully created and analyzed.
Biopacemaker performance is dependent on its physical configuration, particularly spatial distribution.
This research supports the development of biopacemakers as a viable alternative for treating cardiac conduction disorders.