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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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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...
7.6K
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...
1.9K
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....
18.2K
Exercise Stress Test01:26

Exercise Stress Test

1.9K
Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
1.9K
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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Related Experiment Video

Updated: Mar 26, 2026

Evaluation of Hydration Status by Bioelectrical Impedance Vector Analysis in Patients with Ischemic Heart Disease Undergoing Exercise Stress Test
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Evaluation of Hydration Status by Bioelectrical Impedance Vector Analysis in Patients with Ischemic Heart Disease Undergoing Exercise Stress Test

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ST-segment changes in normal men during ambulatory electrocardiography.

D J Robson, S Belton

    European Heart Journal
    |March 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    Ambulatory electrocardiographic monitoring revealed that ST-segment changes are common in healthy men aged 30 and under. These findings highlight the prevalence of transient cardiac electrical activity variations in younger, healthy individuals.

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    A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
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    A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis

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    Area of Science:

    • Cardiology
    • Electrophysiology
    • Preventive Medicine

    Background:

    • Ambulatory electrocardiographic monitoring is a key tool for assessing cardiac electrical activity.
    • Understanding normal variations in electrocardiogram (ECG) parameters is crucial for accurate diagnosis.
    • Previous studies have not extensively detailed ST-segment changes in young, healthy male populations.

    Purpose of the Study:

    • To investigate the occurrence and characteristics of ST-segment changes during 24-hour ambulatory ECG monitoring in healthy men.
    • To compare the prevalence of ST-segment changes between younger (≤30 years) and older (>30 years) healthy male cohorts.

    Main Methods:

    • 24-hour ambulatory electrocardiographic monitoring was conducted on 46 healthy male subjects.
    • Subjects were stratified into two age groups: 30 years and under (n=30) and over 30 years (n=16).
    • An ECG analysis system with a digital filter was utilized to ensure accurate low-frequency response.

    Main Results:

    • ST-segment changes were frequently observed in the younger cohort (≤30 years).
    • Specifically, 13 subjects aged 30 and under exhibited ST elevation, 3 showed both ST elevation and depression, and 3 had ST depression.
    • In the older cohort (>30 years), 3 out of 16 subjects displayed ST elevation.

    Conclusions:

    • ST-segment variations during ambulatory electrocardiographic monitoring are a common finding in healthy men aged 30 and under.
    • These findings suggest that transient ST-segment changes may represent a normal physiological response in younger healthy males.
    • Further research is warranted to establish normative data and differentiate physiological changes from pathological conditions.