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Electrophysiology of Normal Cardiac Rhythm

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...

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.
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Specialized Characteristics of Cardiac Muscles

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The Role of Ion Channels in Neuronal Computation

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A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
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Assessment of Myofilament Ca2+ Sensitivity Underlying Cardiac Excitation-contraction Coupling

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Tortuous Cardiac Intercalated Discs Modulate Ephaptic Coupling.

Ena Ivanovic¹, Jan P Kucera¹

¹Department of Physiology, University of Bern, CH-3012 Bern, Switzerland.

|November 11, 2022

Summary

Cardiac ephaptic coupling, influenced by intercalated disc structure, affects action potential propagation. Concentric folds enhance coupling, while radial folds attenuate it, showing folding patterns modulate electrical signaling in the heart.

Keywords:

cardiac electrophysiology computer modeling ephaptic coupling intercalated discs sodium channels

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Analysis of Tubular Membrane Networks in Cardiac Myocytes from Atria and Ventricles

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Published on: October 15, 2014

Area of Science:

Cardiology
Biophysics
Computational Biology

Background:

Cardiac ephaptic coupling influences action potential propagation via intercellular clefts.
Intercalated discs exhibit complex, tortuous geometries due to plicate and interplicate regions.

Purpose of the Study:

To investigate how the convoluted structure of intercalated discs affects cardiac ephaptic coupling.
To model the impact of folding patterns on electrical potential and sodium current.

Main Methods:

Refinement of a computational model for intercalated discs.
Testing predefined folded geometries parametrized by orientation, amplitude, and fold number.
Assessment of ephaptic interactions via minimal cleft potential and sodium current amplitude.

Main Results:

Concentric folds reinforced ephaptic interactions, leading to more negative cleft potentials with increased fold amplitude and number.
Radial folds attenuated ephaptic interactions, resulting in less negative cleft potentials.
Increased resistance in concentric folds and decreased net resistance in radial folds explained the observed effects.

Conclusions:

The folding pattern of cardiac intercalated discs significantly modulates ephaptic coupling.
Geometric variations influence the electrical communication between cardiomyocytes.
Findings highlight the role of cardiac structure in electrical signal propagation.