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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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Cardiac Action Potential01:30

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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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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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Mechanism of Cardiac Arrhythmias01:28

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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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Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

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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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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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A Phase Defect Framework for the Analysis of Cardiac Arrhythmia Patterns.

Louise Arno1, Jan Quan1, Nhan T Nguyen1

  • 1KULeuven Campus KULAK, Department of Mathematics, Kortrijk, Belgium.

Frontiers in Physiology
|October 11, 2021
PubMed
Summary

This study introduces phase defect lines (PDLs) and surfaces (PDSs) as a more general framework for analyzing cardiac arrhythmias, offering new insights beyond traditional phase singularities (PSs). PDLs provide a longer-lasting view of electrical patterns in heart rhythm disorders.

Keywords:
cardiac arrhythmianon-linear analysisphase defectself-organizationspiral wave

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Area of Science:

  • Cardiology
  • Biophysics
  • Computational Biology

Background:

  • Cardiac arrhythmias involve complex electrical activation patterns.
  • Current analysis often relies on phase singularities (PSs).
  • Understanding these dynamics is crucial for treating heart rhythm disorders.

Purpose of the Study:

  • To propose a more general framework for analyzing cardiac electrical activity using phase defect lines (PDLs) and phase defect surfaces (PDSs).
  • To unify concepts in cardiac electrophysiology, including local activation time, phase description, conduction block lines, and rotor cores.
  • To introduce a simple method for detecting PDLs and validate it with simulation and experimental data.

Main Methods:

  • Developed a novel framework focusing on PDLs and PDSs.
  • Proposed a simple PDL detection algorithm.
  • Applied the method to simulated data and optical mapping experiments of ventricular tachycardia in rabbit hearts (n=6).

Main Results:

  • Phase defect lines (PDLs) and surfaces (PDSs) were identified as more general mechanisms than phase singularities (PSs).
  • The framework unified local activation time/phase descriptions and conduction block lines/rotor cores.
  • In rabbit ventricular tachycardia, most PSs were located on PDLs, which had significantly longer lifespans.

Conclusions:

  • The PDL/PDS framework offers a more comprehensive approach to understanding cardiac activation patterns.
  • This revisited framework can aid in developing new theories and experimental analyses for heart rhythm disorders.
  • The proposed PDL detection method is effective and provides valuable insights into arrhythmia dynamics.