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Electrocardiogram Fundamentals

Electrocardiogram Fundamentals

Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin...

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Related Experiment Video

Updated: Jan 4, 2026

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

Published on: April 11, 2025

[Non-contact mapping of the left atrium using a multi electrode mapping array].

Karlheinz Seidl¹, Torsten Becker, Jochen Senges

¹Herzzentrum, Ludwigshafen. Seidlk@klilu.de

|December 23, 2003

Summary

This summary is machine-generated.

Non-contact mapping offers simultaneous 3-D visualization of heart electrical activity, unlike sequential methods. This high-density mapping aids in rapidly identifying arrhythmogenic sources and guiding ablation strategies for atrial fibrillation.

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Area of Science:

Electrophysiology
Cardiovascular Technology
Medical Imaging

Background:

Conventional and electroanatomic mapping systems provide sequential data.
Simultaneous mapping offers advantages in understanding complex cardiac electrical activity.

Purpose of the Study:

To report on the methods and results of ablation strategies for atrial fibrillation using a non-contact mapping system.
To highlight the capabilities of non-contact mapping in identifying arrhythmogenic foci.

Main Methods:

Utilizes a non-contact mapping system with a multielectrode-array catheter.
Detects far-field endocardial potentials to reconstruct over 3,000 unipolar virtual electrograms.
Generates instantaneous three-dimensional (3-D) isopotential maps based on virtual electrograms.

Main Results:

Enables high-density mapping of the endocardial activation sequence.
Allows immediate and simultaneous identification of propagation vectors.
Facilitates single-beat identification of arrhythmogenic foci.

Conclusions:

Non-contact mapping provides simultaneous, high-density visualization of cardiac electrical activity.
This technology enables rapid identification of arrhythmogenic sources for atrial fibrillation.
It supports the development and application of advanced ablation strategies.