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Related Concept Videos

Cardiac Action Potential01:30

Cardiac Action Potential

8.2K
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
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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...
14.1K
Electrocardiogram01:29

Electrocardiogram

7.4K
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...
7.4K
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

1.8K
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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Exercise Stress Test01:26

Exercise Stress Test

1.7K
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
1.7K
Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

3.5K
Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
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Related Experiment Video

Updated: Mar 15, 2026

Confirmation of Myocardial Ischemia and Reperfusion Injury in Mice Using Surface Pad Electrocardiography
09:23

Confirmation of Myocardial Ischemia and Reperfusion Injury in Mice Using Surface Pad Electrocardiography

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Negative T Waves Again.

Ross MacKenzie

    Journal of Insurance Medicine (New York, N.Y.)
    |September 2, 2016
    PubMed
    Summary
    This summary is machine-generated.

    An asymptomatic man had an abnormal electrocardiogram (ECG) during a life insurance screening. Further tests identified a rare underlying condition responsible for the unexpected ECG findings.

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    Related Experiment Videos

    Last Updated: Mar 15, 2026

    Confirmation of Myocardial Ischemia and Reperfusion Injury in Mice Using Surface Pad Electrocardiography
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    Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice
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    Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice

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    Area of Science:

    • Cardiology
    • Diagnostic Medicine

    Background:

    • Electrocardiograms (ECGs) are standard for cardiovascular assessment.
    • Routine screenings can detect unexpected cardiac abnormalities.

    Purpose of the Study:

    • To investigate the cause of an abnormal ECG in an asymptomatic individual.
    • To highlight rare etiologies of electrocardiographic changes.

    Main Methods:

    • Electrocardiogram (ECG) analysis.
    • Diagnostic workup for cardiac abnormalities.

    Main Results:

    • An asymptomatic middle-aged man presented with an abnormal ECG during routine screening.
    • Investigations revealed a rare underlying condition causing the ECG abnormality.

    Conclusions:

    • Rare conditions can manifest as incidental ECG findings.
    • Comprehensive investigation is crucial for asymptomatic individuals with abnormal ECGs.