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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

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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...
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Imaging Studies for Cardiovascular System I:Echocardiography01:17

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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,...
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Imaging Studies for Cardiovascular System II:Types of Echocardiography01:20

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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)
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Electrocardiogram Fundamentals01:28

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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
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ECG Interpretation of Rhythms01:24

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An electrocardiogram (ECG)graphically represents the heart's electrical activity on ECG paper or a monitor.
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Correlation between ECG and Cardiac Cycle01:25

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The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
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Related Experiment Video

Updated: Mar 16, 2026

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

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Electrocardiographic imaging.

R Hren1, G Stroink2

  • 1Institute of Mathematics, Physics, and Mechanics Jadranska 19 University of Ljubljana, Slovenia, Slovenia.

Herzschrittmachertherapie & Elektrophysiologie
|August 13, 2016
PubMed
Summary
This summary is machine-generated.

Electrocardiographic imaging (ECGI) can detect changes in ventricular electrical activation patterns from pacing. This study shows ECGI accurately reconstructs myocardial activation, providing visual information on pacing sites.

Keywords:
Key words Mapping – epicardium – potentials

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Area of Science:

  • Biomedical Engineering
  • Computational Electrophysiology
  • Medical Imaging

Background:

  • Electrocardiographic imaging (ECGI) is a noninvasive technique to study ventricular electrical activity.
  • Understanding epicardial potential changes is crucial for diagnosing cardiac conditions.

Purpose of the Study:

  • To evaluate ECGI's ability to detect alterations in pacing-generated epicardial potentials.
  • To assess the accuracy of ECGI in reconstructing myocardial activation patterns.

Main Methods:

  • A human ventricular myocardium anatomical model simulated endocardial pacing from 116 sites.
  • Boundary element models simulated extracardiac potentials at epicardial and torso surfaces.
  • ECGI computed epicardial potentials and unipolar electrograms.

Main Results:

  • Inversely computed electrograms showed high correlation (r>0.9) with simulated data at 71% of sites.
  • Calculated epicardial potential patterns visually indicated the pacing site.
  • ECGI successfully reconstructed spatio-temporal patterns of myocardial activation.

Conclusions:

  • ECGI can accurately detect changes in epicardial potentials related to pacing.
  • ECGI provides detailed spatio-temporal mapping of myocardial activation.
  • This modality offers valuable insights into ventricular electrophysiology.