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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...

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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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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.
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Electrocardiogram Fundamentals

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An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
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Mechanism of Cardiac Arrhythmias

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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.

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The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send...

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Updated: Sep 6, 2025

In Silico Clinical Trials for Cardiovascular Disease

In Silico Clinical Trials for Cardiovascular Disease

Published on: May 27, 2022

A Variable-Volume Heart Model for Galvanic Coupling-Based Conductive Intracardiac Communication.

Yiming Liu¹, Yueming Gao¹, Liting Chen¹

¹College of Physics and Information Engineering, Fuzhou University, Fuzhou 350108, China.

Sensors (Basel, Switzerland)

|June 24, 2022

Summary

This study developed a new heart model to understand how cardiac pulsation affects conductive intracardiac communication (CIC) for leadless pacemakers. Results show pulsation causes minimal CIC channel attenuation, less than 3 dB.

Keywords:

circuit-coupled electrical field model conductive intracardiac communication equivalent heart model galvanic coupling leadless pacemaker volume of chamber

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Last Updated: Sep 6, 2025

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Published on: September 17, 2015

Area of Science:

Biomedical Engineering
Cardiovascular Technology
Medical Device Communication

Background:

Conductive intracardiac communication (CIC) is crucial for multisite leadless pacemakers in cardiac resynchronization therapy.
Cardiac pulsation significantly impacts intracardiac communication channel attenuation, a phenomenon requiring further investigation.

Purpose of the Study:

To propose and validate a novel variable-volume circuit-coupled electrical field heart model.
To investigate the dynamic characteristics of intracardiac channels influenced by cardiac pulsation.
To quantify the effect of cardiac pulsation on CIC channel attenuation.

Main Methods:

Developed a variable-volume electrical field heart model incorporating blood and myocardium.
Integrated measurement influences as an equivalent circuit.
Simulated dynamic channel characteristics by varying chamber volumes simulating the cardiac cycle.
Conducted in vitro experiments using a porcine heart for model validation.

Main Results:

The novel heart model accurately simulated dynamic intracardiac channel characteristics.
Pacemaker distance was the most significant factor influencing CIC channel attenuation.
Cardiac pulsation resulted in a CIC channel attenuation variation of less than 3 dB in simulations and measurements.

Conclusions:

The proposed heart model effectively verifies the impact of cardiac pulsation on CIC.
CIC channel attenuation is minimally affected by cardiac pulsation, with variations under 3 dB.
Findings support the reliability of CIC technology in leadless pacemakers despite dynamic cardiac motion.