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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 of...

Mechanism of Cardiac Arrhythmias

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.

Pathophysiology of Cardiac Performance

Pathophysiology of Cardiac Performance

Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...

Conduction System of the Heart

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:...

Conduction System of the Heart

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...

Cardiac Action Potential

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: May 29, 2026

Patient-specific Modeling of the Heart: Estimation of Ventricular Fiber Orientations

Patient-specific Modeling of the Heart: Estimation of Ventricular Fiber Orientations

Published on: January 8, 2013

Lightning and the Heart: Fractal Behavior in Cardiac Function.

James B Bassingthwaighte¹, J H G M van Beek

¹Center for Bioengineering, University of Washington, Seattle, WA 98195, USA.

Proceedings of the IEEE. Institute of Electrical and Electronics Engineers

|September 23, 2011

Summary

Fractal geometry reveals underlying order in biological systems, particularly the heart. This approach helps explain complex phenomena like cardiac fibrillation and blood flow heterogeneity.

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Area of Science:

Biology
Physics
Medicine

Background:

Physical and living systems often exhibit fractal behavior.
Fractal geometry provides a framework for understanding complex biological processes.
The heart's structure and function may be well described by fractal algorithms.

Purpose of the Study:

To explore the application of fractal geometry in understanding biological systems.
To investigate fractal features within the heart, including vascular networks and cellular syncytium.
To elucidate how fractal geometry explains cardiac phenomena like fibrillation and perfusion heterogeneity.

Main Methods:

Analysis of physical and biological systems for fractal characteristics.
Application of fractal geometry to model cardiac structures and functions.
Examination of asymmetrical fractal branching networks for myocardial blood flow.

Main Results:

Fractal descriptions imply order within chaotic biological dynamics.
Fractal features are identified in the heart's vascular network, cellular syncytium, and transport processes.
Fractal geometry effectively explains myocardial flow heterogeneity through branching networks.

Conclusions:

The heart can be viewed as a prototypical organ exhibiting fractal properties.
Fractal geometry offers insights into global cardiac behaviors like fibrillation and perfusion heterogeneity.
Understanding fractal patterns is crucial for comprehending complex physiological processes.