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Electrocardiogram

Electrocardiogram

An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and...

Imaging Studies for Cardiovascular System I:Echocardiography

Imaging Studies for Cardiovascular System I:Echocardiography

Cardiac imaging studies encompass a wide range of noninvasive and minimally invasive techniques designed to visualize the heart's structure and function in detail. One such technique is echocardiography, which uses high-frequency ultrasound waves to produce detailed images of the heart, known as echocardiograms.
Indications: Echocardiography is utilized to diagnose heart failure, valve disorders, and myocardial infarction. It also assesses cardiac structures' size, shape, and motion,...

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...

Imaging Studies for Cardiovascular System II:Types of Echocardiography

Imaging Studies for Cardiovascular System II:Types of Echocardiography

Echocardiography plays a role in assessing cardiac health and detecting heart conditions, with various types providing critical insights for diagnosis and treatment.
Types of Echocardiography
Transthoracic Echocardiography (TTE)
TTE is the most common type of echocardiogram which involves placing a transducer on the patient's chest, emitting sound waves to create heart images. TTE is invaluable for evaluating the heart's size, structure, and motion, making it particularly useful for...

ECG Interpretation of Rhythms

ECG Interpretation of Rhythms

An electrocardiogram (ECG)graphically represents the heart's electrical activity on ECG paper or a monitor.
Components of the Electrocardiogram
The primary components of a normal ECG waveform in Normal sinus rhythm(NSR) include the P wave, PR interval, QRS complex, ST segment, T wave, and occasionally a U wave.
ECG waveforms are divided by vertical and horizontal lines at standard intervals.
The horizontal axis measures time and rate, and the vertical axis measures amplitude or voltage....

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Related Experiment Video

Updated: Feb 20, 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

Three-dimensional electrocardiographic imaging.

¹Department of Biomedical Engineering, Minnesota University, Minneapolis, MN, USA.

Conference Proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference

|February 3, 2007

Summary

This summary is machine-generated.

Three-dimensional electrocardiographic imaging technology (3DEIT) reconstructs cardiac electrical activity from body surface signals. This approach shows promise for mapping arrhythmias and guiding treatments, meriting further investigation.

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Evaluation of Left Ventricular Structure and Function using 3D Echocardiography

Evaluation of Left Ventricular Structure and Function using 3D Echocardiography

Published on: October 28, 2020

Area of Science:

Biomedical Engineering
Cardiovascular Electrophysiology
Medical Imaging

Background:

Accurate mapping of cardiac electrical activity is crucial for understanding and treating arrhythmias.
Current methods for assessing cardiac electrophysiology have limitations in spatial resolution and invasiveness.

Purpose of the Study:

To review the development and evaluation of three-dimensional electrocardiographic imaging technology (3DEIT).
To demonstrate the feasibility of 3DEIT for imaging cardiac activation and localizing arrhythmia origins.
To present pilot experimental results validating the 3DEIT approach.

Main Methods:

Utilizing body surface electrocardiogram (ECG) signals and a realistic heart geometry model.
Incorporating electrophysiological a priori information into the computational model.
Conducting computer simulations and pilot experimental studies with intracardiac recordings.

Main Results:

Computer simulations demonstrated the feasibility of imaging myocardial activation sequences.
3DEIT successfully localized sites of activation origin and simulated arrhythmias.
Pilot studies in a patient with a pacemaker and experimental animals showed promising results.

Conclusions:

The developed 3DEIT technology is feasible for non-invasively assessing cardiac electrophysiology.
3DEIT holds potential for improved diagnosis and treatment of cardiac arrhythmias.
Further investigation is warranted to advance 3DEIT for clinical applications.