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Related Concept Videos

Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

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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
An ECG utilizes electrodes on the skin...
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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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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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Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

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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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ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

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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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Imaging Studies for Cardiovascular System I:Echocardiography01:17

Imaging Studies for Cardiovascular System I:Echocardiography

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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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Unmasking the J-wave: 3D ECG shows terminal depolarization mimicking early repolarization.

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Updated: May 29, 2025

Patient Directed Recording of a Bipolar Three-Lead Electrocardiogram using a Smartwatch with ECG Function
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Three-dimensional standard electrocardiogram: A first approach based on precordial leads.

Alejandro Jesús Bermejo Valdés1

  • 1Emergency Medical Service, Rioja Salud, Logroño, La Rioja, Spain.

Journal of Electrocardiology
|February 1, 2025
PubMed
Summary

This study introduces a novel 3D electrocardiography (ECG) method to improve acute myocardial ischemia detection. The new "almost-curvature" metric in 3D ECG shows enhanced diagnostic capabilities for cardiac electrical activity variations.

Keywords:
3D ECGAlmost-curvatureCardiac diagnosticsElectrocardiographyMyocardial ischemia

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Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Medical Imaging

Background:

  • Traditional 2D electrocardiography (ECG) has limitations in capturing the full complexity of cardiac electrical activity.
  • A novel 3D ECG methodology is proposed, derived from standard 2D recordings, to provide enhanced spatial insights without new hardware.
  • A new metric, 'almost-curvature,' is introduced to optimize the detection of acute ischemic states, addressing diagnostic sensitivity issues.

Purpose of the Study:

  • To introduce the methodology for developing 3D ECG.
  • To evaluate the diagnostic utility of 3D ECG in detecting morphological changes associated with acute myocardial ischemia.
  • To assess the effectiveness of perimeter, curvature, and almost-curvature metrics in diagnosing ischemia.

Main Methods:

  • Developed a 3D ECG methodology using spherical-to-Cartesian coordinate transformations on standard ECG data.
  • Utilized PhysioNet database and validated with patient datasets of induced myocardial ischemia.
  • Extracted and compared perimeter, curvature, and almost-curvature metrics from 2D and 3D ECG across different ischemic states using statistical tests and clustering analyses.

Main Results:

  • A correlation was found between standard deflections in 3D ECG and novel loops generated by the methodology.
  • The 'almost-curvature' metric demonstrated superior detection of variations between ischemic states compared to traditional curvature metrics.
  • 3D ECG analysis revealed an increase in curvature and perimeter during ischemia, capturing changes potentially missed by 2D methods.

Conclusions:

  • 3D ECG analysis shows potential for enhanced detection of ischemic alterations by providing detailed spatial representation of cardiac electrical activity.
  • The methodology integrates temporal and voltage dynamics, potentially revealing subtle ischemic morphological changes.
  • Further studies are essential to validate the clinical applicability and address limitations of this promising diagnostic tool.