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Related Concept Videos

Electrocardiogram01:29

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 the T...
Electrocardiogram Fundamentals01:28

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 to...
ECG Interpretation of Rhythms01:24

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. When...
Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

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...
Cardiac Action Potential01:30

Cardiac Action Potential

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.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials
Electrophysiology of Normal Cardiac Rhythm01:19

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 of...

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Related Experiment Video

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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

Published on: April 11, 2025

Why do we need supercomputers to understand the electrocardiographic T wave?

Mark Potse1, A-Robert LeBlanc, Alain Vinet

  • 1Research Center, Hôpital du Sacré-Coeur, Department of Physiology, Institute of Biomedical Engineering, Université de Montréal, Québec, Canada. mark@potse.nl

Anadolu Kardiyoloji Dergisi : AKD = the Anatolian Journal of Cardiology
|August 1, 2007
PubMed
Summary

Reaction-diffusion models accurately simulate cardiac electrical activity, but fixed action potential models can exaggerate T-wave amplitudes in electrocardiograms (ECGs). Hybrid models require high spatial resolution for accurate T-wave representation.

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Area of Science:

  • Computational biology
  • Cardiovascular physiology
  • Biophysics

Background:

  • Cardiac electrical activity involves complex interplay of potentials and currents.
  • Reaction-diffusion (RD) equations model this propagation but are computationally intensive.
  • Previous models used simplified, fixed action potential (AP) shapes and propagation velocities.

Purpose of the Study:

  • To evaluate the importance of RD models for studying T waves.
  • To compare ECGs generated by RD, fixed-AP, and hybrid models.
  • To assess the impact of spatial resolution on hybrid model accuracy.

Main Methods:

  • Simulated cardiac AP propagation using an RD model with heterogeneous membrane properties.
  • Computed activation times to drive fixed-AP and hybrid models.
  • Hybrid model computed AP only during repolarization and was tested at various spatial resolutions.
  • Generated electrocardiograms (ECGs) using all three modeling approaches.

Main Results:

  • QRS complexes were consistent across all models.
  • Fixed-AP models overestimated T-wave amplitudes by 20-40% in specific leads (V1-V3).
  • Hybrid models matched RD model T waves at 0.25-mm resolution but underestimated amplitude at lower resolutions.

Conclusions:

  • Using fixed AP waveforms in forward ECG models leads to inaccurate, exaggerated T waves.
  • Hybrid models necessitate high spatial resolution, comparable to full RD models, for accurate T-wave simulation.