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Related Concept Videos

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
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...
Action Potential: Phases of Stimulation01:28

Action Potential: Phases of Stimulation

The action potential is a complex electrical event that occurs in excitable cells, such as neurons and muscle cells. It consists of several distinct phases, each with specific characteristics.
Resting Phase:
In this phase, the cell's membrane is at its resting potential, typically around -70 millivolts (mV) for neurons. Inside the cell, there is a higher concentration of potassium ions (K+) and a lower concentration of sodium ions (Na+). Voltage-gated sodium channels are closed, and...
Generation of Action Potential in Skeletal Muscles01:24

Generation of Action Potential in Skeletal Muscles

Every cell in the body maintains a membrane potential due to an uneven distribution of positive and negative charges across its plasma membrane. The membrane potential is measured in millivolts and quantifies the difference in charge across the membrane.
Like neurons, muscle cells are also regarded as excitable due to their capacity to change in response to stimuli, primarily due to voltage-gated ion channels embedded in their plasma membranes, which get activated by alterations in the cell's...
Propagation of Action Potentials01:23

Propagation of Action Potentials

The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
Action Potentials01:41

Action Potentials

Overview

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Related Experiment Video

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In Silico Clinical Trials for Cardiovascular Disease
09:09

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A generic ionic model of cardiac action potentials.

Tianruo Guo1, Amr Al Abed, Nigel H Lovell

  • 1Graduate School of Biomedical Engineering, University of New South Wales, Sydney, 2052, Australia.

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
|November 25, 2010
PubMed
Summary
This summary is machine-generated.

A new generic cardiac ionic model uses Hodgkin-Huxley kinetics to accurately reproduce cardiac action potential waveforms. This adaptable model optimizes ion channel parameters for heterogeneous cardiac tissue and individual cell predictions.

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Area of Science:

  • Computational Biology
  • Biophysics
  • Cardiovascular Physiology

Background:

  • Cardiac electrophysiology is complex, involving numerous ion channels.
  • Accurate modeling of cardiac action potentials is crucial for understanding arrhythmias and drug effects.
  • Existing models may lack the flexibility to capture the heterogeneity of cardiac tissue.

Purpose of the Study:

  • To present a generic cardiac ionic model adaptable to various cardiac conditions.
  • To enable accurate reproduction and prediction of electrophysiological action potential waveforms.
  • To incorporate a user-defined number of ion currents for enhanced model customization.

Main Methods:

  • Developed a generic cardiac ionic model based on two-gate Hodgkin-Huxley kinetics.
  • Optimized parameters governing ion channel kinetics and magnitudes.
  • Incorporated user-defined voltage and time-dependent ion currents.

Main Results:

  • The model accurately reproduces action potential waveforms in heterogeneous cardiac tissue.
  • Demonstrated the ability to predict electrophysiological waveforms from multiple recordings.
  • Showcased the model's adaptability through parameter optimization.

Conclusions:

  • The presented generic cardiac ionic model offers a flexible and accurate tool for studying cardiac electrophysiology.
  • This model facilitates the prediction of action potential waveforms in diverse cardiac cell types and tissues.
  • Its customizable nature supports research into cardiac disease mechanisms and therapeutic interventions.