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Related Concept Videos

Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

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Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
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Electrophysiology of Normal Cardiac Rhythm01:19

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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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Conduction System of the Heart01:19

Conduction System of the Heart

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Autorhythmicity is a term that refers to the heart's inherent ability to generate electrical signals and instigate muscle contractions. This self-regulating conduction system within the heart consists of two key components: the pacemaker cells and specialized conducting cells.
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Conduction System of the Heart01:20

Conduction System of the Heart

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The cardiac conduction system produces and transmits electrical impulses that prompt myocardial contraction, ensuring efficient heart function. This intricate system ensures that the heart beats in a coordinated and efficient manner, beginning with the atria and then the ventricles. The conduction system optimizes cardiac output by maintaining this precise sequence, which is crucial for adequate blood circulation.
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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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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.
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Related Experiment Video

Updated: Oct 27, 2025

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
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Pacemaker malfunction? What is the mechanism?

Naga Venkata K Pothineni1, Jackson J Liang2

  • 1Division of Cardiovascular Medicine, University of Pennsylvania, PA, USA.

Journal of Electrocardiology
|July 23, 2021
PubMed
Summary
This summary is machine-generated.

External interference from a retained abdominal generator caused pacemaker artifacts on an electrocardiogram (ECG), mimicking lead malfunction. Careful patient history and physical exam are crucial for diagnosing these external pacemaker artifacts.

Keywords:
artifactpacemaker

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Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Medical Diagnostics

Background:

  • Electrocardiogram (ECG) artifacts are frequent challenges in clinical settings.
  • Pacemaker function is critical for managing cardiac arrhythmias.

Observation:

  • A case involving a chronic retained abdominal generator presented with unusual ECG findings.
  • The external interference mimicked an atrial lead malfunction on the ECG.

Findings:

  • External interference from a retained abdominal generator can create significant pacing artifacts.
  • These artifacts can be misdiagnosed as genuine lead issues without thorough evaluation.

Implications:

  • Highlights the importance of considering external sources for ECG abnormalities.
  • Emphasizes the diagnostic value of detailed patient history and physical examination in pacemaker patients.
  • Suggests a need for increased awareness of non-device-related ECG interference.