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Related Concept Videos

Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

881
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.
881
Disturbances in Heart Rhythm01:28

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...
884
ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

171
Arrhythmias are disturbances in the heart's rhythm that lead to abnormal heartbeats. These irregularities can originate from different parts of the heart and are classified based on their origin and nature.
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism,...
171
Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers01:24

Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers

704
Adrenergic stimulation generally impacts cardiac rate and rhythm. Specifically, stimulation of the β-adrenoceptors triggers an increase in intracellular calcium ion influx and pacemaker currents, which may cause arrhythmias. Catecholamines like adrenaline also demonstrate β2-adrenoceptor-mediated hypokalemia, impacting cardiac action potential and disrupting the normal cardiac rhythm. Class II antiarrhythmic drugs are β-adrenoceptor antagonists or β-blockers, which...
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Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

2.0K
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...
2.0K
Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers01:22

Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers

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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,...
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Isolation of Atrial Myocytes from Adult Mice
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Immune cells and arrhythmias.

Joshua A Keefe1,2, Jian Wang3,4, Jiangping Song5,6,7

  • 1Cardiovascular Research Institute, Baylor College of Medicine, BCM335, One Baylor Plaza, Houston, TX 77030, USA.

Cardiovascular Research
|February 12, 2025
PubMed
Summary

Cardiac immune cells are key drivers of heart rhythm disorders like arrhythmias. This review details how specific immune cell types contribute to atrial and ventricular arrhythmias, impacting heart health.

Keywords:
Atrial fibrillationCalcium handlingCardiac arrhythmiasImmune cellsMacrophages

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Area of Science:

  • Cardiology
  • Immunology
  • Electrophysiology

Background:

  • Cardiac arrhythmias represent a major global health burden, contributing significantly to patient morbidity and mortality.
  • Recent research highlights the critical involvement of cardiac immune cells in the development and progression of arrhythmias.
  • Understanding these immune mechanisms is crucial for developing novel therapeutic strategies.

Purpose of the Study:

  • To comprehensively review the mechanistic roles of various immune cell subtypes in cardiac arrhythmia pathogenesis.
  • To provide expert commentary on the contribution of resident and infiltrating cardiac immune cells to atrial and ventricular arrhythmias.
  • To synthesize current evidence on immune cell involvement in arrhythmia development.

Main Methods:

  • Literature review of preclinical and clinical studies.
  • Expert analysis and synthesis of existing research findings.
  • Focus on immune cell subtypes and their functional roles in arrhythmia.

Main Results:

  • Specific immune cell populations, both resident and infiltrating, are directly implicated in arrhythmia development.
  • Different immune cells exert distinct mechanistic effects on atrial and ventricular electrophysiology.
  • Immune cell activity influences structural and electrical remodeling in the context of arrhythmias.

Conclusions:

  • Immune cell-mediated mechanisms are integral to the pathogenesis of cardiac arrhythmias.
  • Targeting specific cardiac immune cells may offer novel therapeutic avenues for managing arrhythmias.
  • Further research into cardiac immunology is essential for advancing arrhythmia treatment.