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Related Concept Videos

Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers01:12

Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers

Class III antiarrhythmic drugs are a group of medications that can prolong action potentials in the heart. They achieve this by blocking potassium channels or enhancing inward currents from sodium channels. However, these drugs have a unique property of "reverse use-dependence," which is most pronounced at slower heart rates and can lead to torsades de pointes—a specific type of arrhythmia. However, it is essential to note that excessive QT interval prolongation—a measure of the heart's...
Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers01:22

Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers

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,...
Dysrhythmias VI: Management of Dysrhythmias01:25

Dysrhythmias VI: Management of Dysrhythmias

Dysrhythmia management involves a multifaceted approach, incorporating pharmacological treatments, medical procedures, surgical interventions, lifestyle modifications, and patient education.Pharmacological ManagementAntiarrhythmic Drugs:Class I (Sodium Channel Blockers): This class includes quinidine and procainamide, which reduce the speed of impulse conduction in the heart, stabilize the cardiac membrane, and control arrhythmias. Quinidine and procainamide are Class IA agents that prolong the...
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

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...
Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers01:24

Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers

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 indirectly block calcium...
Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

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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Related Experiment Video

Updated: Jul 12, 2026

Transesophageal Atrial Burst Pacing for Atrial Fibrillation Induction in Rats
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Published on: February 14, 2022

Ionic Disorders in Persistent Atrial Fibrillation: Therapeutic Targeting by Plant-Derived Bioactive Compounds.

Yize Zhai1, Na Shi1, Wenzhuo Duan1

  • 1Heilongjiang University of Chinese Medicine, Harbin, China, hljucm.edu.cn.

Cardiology Research and Practice
|July 11, 2026
PubMed
Summary
This summary is machine-generated.

Plant compounds may correct ion channel issues in persistent atrial fibrillation (AF). This review explores phytochemicals for novel antiarrhythmic therapies targeting cardiac electrical instability.

Keywords:
arrhythmiacardiac electrophysiologyion channel dysfunctionpersistent atrial fibrillationplant-derived bioactive compounds

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Isolation of Human Atrial Myocytes for Simultaneous Measurements of Ca2+ Transients and Membrane Currents
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10:53

Isolation of Human Atrial Myocytes for Simultaneous Measurements of Ca2+ Transients and Membrane Currents

Published on: July 3, 2013

Area of Science:

  • Cardiovascular Pharmacology
  • Electrophysiology
  • Natural Product Chemistry

Background:

  • Persistent atrial fibrillation (AF) involves ion channel dysfunction and electrophysiological instability in cardiomyocytes.
  • Dysregulated potassium, sodium, and calcium channels are key contributors to AF pathogenesis.
  • Current AF therapies have limitations, necessitating exploration of novel treatment strategies.

Purpose of the Study:

  • To review the potential of plant-derived bioactive compounds in correcting ion channel abnormalities associated with persistent AF.
  • To assess the efficacy of phytochemicals in modulating ion channel function and improving myocardial electrical stability.
  • To identify future research directions for developing plant-based antiarrhythmic therapies.

Main Methods:

  • Systematic literature review of studies on plant-derived compounds and their effects on cardiac ion channels.
  • Analysis of evidence regarding the mechanisms of action of phytochemicals on ion channel function.
  • Evaluation of the therapeutic potential and limitations of plant compounds for AF treatment.

Main Results:

  • Plant-derived compounds exhibit multitargeted actions, low toxicity, and biocompatibility.
  • Specific phytochemicals demonstrate the ability to modulate ion channel activity, including potassium, sodium, and calcium channels.
  • Evidence suggests these compounds can enhance myocardial electrical stability, offering potential antiarrhythmic effects.

Conclusions:

  • Plant-derived bioactive compounds represent a promising avenue for developing novel antiarrhythmic therapies for persistent AF.
  • Further research is required to elucidate precise mechanisms and clinical translational potential.
  • Phytochemicals could offer a valuable strategy for rectifying ionic imbalances and managing cardiac arrhythmias.