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Related Concept Videos

Pulse rhythm01:30

Pulse rhythm

1.7K
Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac...
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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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Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

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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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Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

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Dysrhythmias, also known as arrhythmias, are irregular heart rhythms that result from abnormal electrical activity in the heart, affecting its ability to circulate blood efficiently. Tachyarrhythmias, a subset of dysrhythmias, are characterized by abnormally fast heart rates exceeding 100 beats per minute. Here are some types of tachyarrhythmias with their distinct ECG features:Sinus Tachycardia:Sinus tachycardia presents a regular heart rhythm with an increased rate of 101-180 beats per...
709
Cardiopulmonary Resuscitation III: AED Use01:23

Cardiopulmonary Resuscitation III: AED Use

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Introduction to AEDAn Automated External Defibrillator (AED) is a portable medical device that analyzes the heart's rhythm and, if necessary, delivers an electrical shock to help the heart re-establish an effective rhythm during sudden cardiac arrest (SCA). SCA occurs when the heart suddenly and unexpectedly stops beating, leading to a loss of blood flow to the brain and other vital organs. In such emergencies, time is of the essence, and using an AED, combined with Cardiopulmonary...
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ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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

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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...
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Related Experiment Video

Updated: May 1, 2026

A New Single Chamber Implantable Defibrillator with Atrial Sensing: A Practical Demonstration of Sensing and Ease of Implantation
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An external automatic device to detect ventricular fibrillation.

C M Jack, E K Hunter, T H Pringle

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

    A new microprocessor system accurately detects cardiac arrest rhythms, including ventricular fibrillation, using ECG data. This technology shows high sensitivity and specificity, making automatic cardiac rhythm detection feasible.

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    Area of Science:

    • Biomedical Engineering
    • Cardiology
    • Medical Device Technology

    Background:

    • Cardiac arrest detection is critical for timely intervention.
    • Existing methods for rhythm analysis can be time-consuming.
    • Automated systems offer potential for faster and more accurate diagnosis.

    Purpose of the Study:

    • To evaluate a microprocessor-based system for detecting cardiac arrest rhythms.
    • To determine the sensitivity and specificity of the system in identifying ventricular fibrillation.
    • To assess the feasibility of automatic cardiac rhythm detection.

    Main Methods:

    • Analysis of 84 cardiac arrests in 78 patients using a microprocessor-based system.
    • ECG sensing via external defibrillator pads.
    • Evaluation of system performance based on rhythm detection accuracy (sensitivity and specificity).

    Main Results:

    • The system demonstrated 93% sensitivity in detecting ventricular fibrillation.
    • Specificity for identifying non-ventricular fibrillation rhythms was 97%.
    • Analysis of ECG sections showed 74% sensitivity and 99% specificity for rhythm detection.

    Conclusions:

    • Microprocessor-based systems can feasibly detect cardiac arrest rhythms with high accuracy.
    • The developed system shows promising performance for automated cardiac rhythm analysis.
    • High specificity is crucial for devices employing automatic ventricular fibrillation detection.