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Related Concept Videos

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...
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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....
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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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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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Cardiac Action Potential01:30

Cardiac Action Potential

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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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Related Experiment Video

Updated: Feb 23, 2026

Patient Directed Recording of a Bipolar Three-Lead Electrocardiogram using a Smartwatch with ECG Function
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Patient Directed Recording of a Bipolar Three-Lead Electrocardiogram using a Smartwatch with ECG Function

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Dynamic ECG in normal subjects

V Masini, M Rocchi, M Santini

    Giornale Italiano Di Cardiologia
    |January 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    Dynamic electrocardiography revealed that while arrhythmias are uncommon in healthy adults, sinus arrhythmias are more prevalent in younger individuals and during sleep. Supraventricular and ventricular arrhythmias increase with age, with distinct patterns during wakefulness and sleep.

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    Area of Science:

    • Cardiology
    • Electrophysiology
    • Preventive Medicine

    Background:

    • Heart rate variability and arrhythmias are key indicators of cardiovascular health.
    • Understanding normal variations in heart rhythm is crucial for identifying pathological conditions.
    • Dynamic electrocardiography provides continuous monitoring for comprehensive cardiac assessment.

    Purpose of the Study:

    • To investigate the incidence and characteristics of arrhythmias in healthy adults using 24-hour dynamic electrocardiography.
    • To analyze heart rate patterns during various daily activities, including rest, mental work, physical exertion, and sleep.
    • To determine age-related differences in arrhythmia prevalence and patterns.

    Main Methods:

    • A 24-hour dynamic electrocardiography (Holter monitoring) was performed on 100 healthy subjects (50 males, 50 females) aged 20-70 years.
    • Heart rate data (high, mean, low) were analyzed across different times of day and during specific activities.
    • Arrhythmia types, including sinus arrhythmias, supraventricular, and ventricular arrhythmias, were identified and quantified.

    Main Results:

    • Sinus arrhythmias were observed in 16% of subjects, more common in younger individuals and during sleep.
    • Supraventricular and ventricular arrhythmias occurred in 20% and 21% of subjects, respectively, with higher incidence in older individuals.
    • Ventricular ectopic beats were more frequent during sleep, while supraventricular ectopic beats were more frequent during wakefulness.

    Conclusions:

    • Arrhythmias are generally uncommon and not repetitive in healthy adults, with most findings lacking pathological significance.
    • Age and sleep state significantly influence the occurrence and type of arrhythmias observed.
    • This study provides valuable normative data on cardiac rhythm variations in a healthy adult population.