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Related Concept Videos

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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Disturbances in Heart Rhythm01:29

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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 II: Classification of Tachyarrhythmias01:28

Dysrhythmias II: Classification of Tachyarrhythmias

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Tachyarrhythmias are a type of dysrhythmia where the heart rate exceeds 100 beats per minute. Here are some common types of tachyarrhythmias:Sinus TachycardiaSinus tachycardia originates from increased impulses from the sinus node, leading to an elevated heart rate. It is often triggered by stress, fever, or exercise.Patients may experience palpitations, a sensation of a racing heart, dizziness, and chest discomfort.Causes and Risk Factors: Common causes include physical exertion, emotional...
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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...
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Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
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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 6, 2026

High-Resolution Endocardial and Epicardial Optical Mapping in a Sheep Model of Stretch-Induced Atrial Fibrillation
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Abnormal ventricular contraction patterns in patients with arrhythmogenic substrates using three-dimensional phase

M Clausen1, P Weismüller, R Weller

  • 1Christian-Albrechts-Universität Kiel, Germany.

European Heart Journal
|September 1, 1993
PubMed
Summary
This summary is machine-generated.

This study introduces a novel mechanical signal analysis using radionuclide ventriculography for diagnosing arrhythmogenic substrates. This phase analysis accurately detects abnormal heart contraction patterns, aiding in the localization of conditions like WPW syndrome and ventricular tachycardia.

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Area of Science:

  • Cardiology
  • Medical Imaging
  • Electrophysiology

Background:

  • Arrhythmogenic substrate diagnosis relies on electrophysiological studies and radiofrequency ablation.
  • Current pre-invasive localization methods include surface ECGs and biomagnetism.
  • Mechanical signals, specifically the initial site of contraction, offer a complementary diagnostic approach.

Purpose of the Study:

  • To investigate the performance of a modified phase analysis using radionuclide ventriculography for detecting arrhythmogenic substrates.
  • To evaluate the method's accuracy in identifying normal contraction patterns, WPW syndrome, and ventricular tachycardia substrates.
  • To define the limitations of this phase analysis technique through experimental studies.

Main Methods:

  • Utilized radionuclide ventriculography with emission tomography to generate 3D phase data.
  • Applied modified phase analysis to patients with normal sinus rhythm, WPW syndrome, and ventricular tachycardia.
  • Conducted experimental studies on pigs to assess spatial precision and limitations.

Main Results:

  • Identified a characteristic phase pattern in 30/44 patients with normal sinus rhythm, originating paraseptally and anteriorly in the right ventricle.
  • Achieved a complete match between mechanical and electrical foci in 14/20 patients with WPW syndrome or ventricular tachycardia.
  • Demonstrated a spatial precision of at least 20 mm in experimental studies with simulated pre-excitation.

Conclusions:

  • Modified phase analysis of radionuclide ventriculography is a viable method for detecting arrhythmogenic substrates.
  • This technique complements electrophysiological studies by providing mechanical localization of arrhythmias.
  • The method shows promise for improved diagnosis and localization of cardiac arrhythmias.