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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

10.0K
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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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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Bode Plots Construction01:24

Bode Plots Construction

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The Bode plot is an essential tool in control system analysis, mapping the frequency response of a system through a magnitude plot and a phase plot, both against a logarithmic frequency axis. To construct a Bode plot, consider the transfer function H(ω):
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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....
21.4K
Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

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Dysrhythmias, also known as arrhythmias, are disturbances in the heart's rhythm that range from benign to life-threatening. A thorough evaluation is crucial for appropriate management and involves a comprehensive medical history, physical examination, and various diagnostic tests.Medical HistorySymptoms: Collect detailed information on palpitations, dizziness, syncope, chest pain, and fatigue. Note their onset, frequency, and triggers.Previous Cardiac Issues: Document any history of heart...
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Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

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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: May 7, 2026

High-Throughput Analysis of Optical Mapping Data Using ElectroMap
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High-Throughput Analysis of Optical Mapping Data Using ElectroMap

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Evaluating epicardial mapping electrogram by the method of dominant frequency and Lorenz plot.

Liqian Sun, Yanlei Wang, Cuiwei Yang

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |October 11, 2013
    PubMed
    Summary
    This summary is machine-generated.

    This study used dominant frequency and Lorenz plots to analyze cardiac signals during atrial fibrillation in dogs. Findings reveal frequency and variability gradients, offering insights into atrial fibrillation mechanisms.

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    High-Resolution Endocardial and Epicardial Optical Mapping in a Sheep Model of Stretch-Induced Atrial Fibrillation
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    High-Resolution Endocardial and Epicardial Optical Mapping in a Sheep Model of Stretch-Induced Atrial Fibrillation

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    Area of Science:

    • Cardiology
    • Computational Biology
    • Biophysics

    Background:

    • Atrial fibrillation (AF) is a complex arrhythmia.
    • Understanding AF electrophysiology is crucial for effective treatment.
    • Current methods may not fully capture AF dynamics.

    Purpose of the Study:

    • To evaluate activation rate and variability in cardiac signals during AF.
    • To investigate the utility of dominant frequency and Lorenz plots in AF analysis.
    • To identify spatial gradients in atrial electrophysiology.

    Main Methods:

    • Epicardial mapping system used to record atrial electrograms in mongrel dogs.
    • Analysis of dominant frequency and Lorenz plots for each signal.
    • Comparison of signals from different myocardial regions, including pulmonary veins.

    Main Results:

    • Existence of both frequency and variability gradients in the atria and pulmonary vein roots.
    • Higher dominant frequencies in anterior atria compared to posterior regions.
    • Greater activation variability in atria than in pulmonary veins.

    Conclusions:

    • Dominant frequency and Lorenz plot analysis reveal spatial gradients in AF.
    • These methods provide a comprehensive understanding of AF electrophysiology.
    • Combined analysis enhances insights into AF mechanisms.