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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

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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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...
1.1K
Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

5.4K
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...
5.4K
Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers01:22

Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers

4.3K
Class I antiarrhythmic drugs are used to treat various types of arrhythmias or irregular heart rhythms. These drugs block the sodium (Na+) channels in the cardiac cells, thereby affecting the movement of electrical impulses across the heart. Class I antiarrhythmic drugs are divided into three subgroups: Class IA, Class IB, and Class IC, each with distinct mechanisms of action and effects on the heart.
Class 1A Antiarrhythmic Drugs: These drugs work by moderately blocking sodium channels,...
4.3K
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.
The pacemaker cells are located in two primary nodes: the sinoatrial (SA) node and the atrioventricular (AV) node. The SA node pacemaker cells can autonomously depolarize, triggering an action potential that leads to the...
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Related Experiment Video

Updated: Apr 17, 2026

Isolation of Atrial Myocytes from Adult Mice
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Ionic mechanisms of arrhythmogenesis.

Justus M Anumonwo1, Sandeep V Pandit2

  • 1Department of Internal Medicine-Cardiology, Center for Arrhythmia Research, University of Michigan, Ann Arbor, MI; Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI.

Trends in Cardiovascular Medicine
|February 22, 2015
PubMed
Summary

Understanding cardiac arrhythmias requires knowledge of ionic mechanisms. Advances in molecular and optical techniques have significantly improved our comprehension of these ion channel biophysics and their role in heart rhythm disturbances.

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Electrophysiological Assessment of Murine Atria with High-Resolution Optical Mapping
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Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
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Area of Science:

  • Cardiology
  • Biophysics
  • Molecular Biology

Background:

  • Cardiac rhythm disturbances, or arrhythmias, are a significant concern in medical science.
  • Understanding the underlying ionic mechanisms is crucial for effective treatment.
  • Recent decades have seen substantial progress in this field.

Purpose of the Study:

  • To review the cellular and tissue manifestations of cardiac rhythm disturbances.
  • To focus on the current understanding of ionic current mechanisms implicated in arrhythmias.
  • To highlight therapeutic implications derived from ion channel research.

Main Methods:

  • Review of molecular, cellular, and optical techniques.
  • Analysis of ion channel biophysics and regulatory properties.
  • Examination of cellular and tissue-level manifestations of arrhythmias.

Main Results:

  • Advances in techniques have greatly enhanced knowledge of ionic mechanisms in arrhythmias.
  • Ion channel research has yielded significant information with therapeutic relevance.
  • A clearer picture of the ionic basis of various cardiac rhythm disturbances has emerged.

Conclusions:

  • Continued research into ionic mechanisms is vital for understanding and treating cardiac arrhythmias.
  • Technological advancements have been key to progress in this area.
  • This knowledge has direct implications for developing new therapeutic strategies.