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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

5.0K
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...
5.0K
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

1.2K
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...
1.2K
ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

11.2K
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....
11.2K
Quartile01:15

Quartile

8.4K
Quartiles are numbers that separate the data into quarters. Quartiles may or may not be part of the data. To find the quartiles, first, find the median or second quartile. The first quartile, Q1, is the middle value of the lower half of the data, and the third quartile, Q3, is the middle value, or median, of the upper half of the data. To get the idea, consider the same data set:
1; 1; 2; 2; 4; 6; 6.8; 7.2; 8; 8.3; 9; 10; 10; 11.5
The median or second quartile is seven. The lower half of the...
8.4K
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

353
Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...
353
Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

11.2K
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...
11.2K

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Related Experiment Video

Updated: Dec 24, 2025

Electrocardiogram Recordings in Anesthetized Mice using Lead II
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[QT Interval and Its Prolongation - What Does It Mean?]

Alessandro Castiglione, Katja Odening

    Deutsche Medizinische Wochenschrift (1946)
    |April 16, 2020
    PubMed
    Summary
    This summary is machine-generated.

    Accurate QT interval measurement is crucial for diagnosing long QT syndrome (LQTS). This review details assessment methods, causes of QT prolongation, and management strategies for LQTS patients.

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    Area of Science:

    • Cardiology
    • Electrophysiology
    • Clinical Medicine

    Background:

    • The QT interval on an electrocardiogram (ECG) is vital for assessing cardiac repolarization.
    • Diagnosing and managing long QT syndrome (LQTS) can be challenging, even for experienced clinicians.

    Purpose of the Study:

    • To provide a comprehensive overview of cardiac repolarization, QT interval assessment, and LQTS management.
    • To clarify the physiological determinants, measurement techniques, causes, and clinical consequences of QT prolongation.

    Main Methods:

    • Review of physiological determinants of cardiac repolarization.
    • Description of the tangent method for accurate QT interval measurement, excluding U waves.
    • Explanation of heart rate correction formulas for the corrected QT interval (QTc).

    Main Results:

    • Accurate QT interval measurement requires specific techniques like the tangent method.
    • QTc prolongation can result from various factors including drugs, electrolyte imbalances, and hormonal influences.
    • Risk stratification for LQTS involves genotype, ECG phenotype, clinical history, and family history.

    Conclusions:

    • Effective LQTS management requires risk stratification and multimodal therapeutic approaches.
    • Prevention strategies include avoiding risk factors and QT-prolonging drugs, alongside pharmacological treatment with beta-blockers.
    • Implantable cardioverter-defibrillators (ICDs) or pacemakers may be considered based on individual risk profiles.