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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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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.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
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Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers01:24

Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers

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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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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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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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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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Electrocardiogram Recordings in Anesthetized Mice using Lead II
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Aldehyde dehydrogenase 2 and arrhythmogenesis.

Junyan Jin1, Jieying Chen1, Yaping Wang1

  • 1Department of Cardiology, Second Affiliated Hospital, Zhejiang University, School of Medicine, Hangzhou, China.

Heart Rhythm
|May 14, 2022
PubMed
Summary

Aldehyde dehydrogenase 2 (ALDH2) activation shows promise for treating cardiac arrhythmias, a major cardiovascular disease. Research highlights ALDH2

Keywords:
Aldehyde dehydrogenase 2Aldehyde detoxificationArrhythmiaArrhythmic treatmentMechanisms

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Area of Science:

  • Cardiovascular Medicine
  • Biochemistry
  • Pharmacology

Background:

  • Cardiac arrhythmia presents significant global health and economic challenges.
  • Current antiarrhythmic therapies are suboptimal despite advancements.
  • Aldehyde dehydrogenase 2 (ALDH2) is a key enzyme in detoxifying harmful aldehydes and mitigating oxidative stress.

Purpose of the Study:

  • To review the role of ALDH2 activation in providing antiarrhythmic protection.
  • To examine the impact of the ALDH2∗2 polymorphism (rs671) on arrhythmia risk.
  • To discuss novel ALDH2 activators as potential antiarrhythmic agents.

Main Methods:

  • Literature review of recent research on ALDH2 and cardiac arrhythmias.
  • Analysis of studies investigating ALDH2 deficiency and arrhythmogenesis.
  • Examination of findings on ALDH2 activators and their therapeutic potential.

Main Results:

  • ALDH2 deficiency is linked to increased risk of cardiac arrhythmias.
  • ALDH2 activation demonstrates potential benefits in preventing arrhythmias.
  • The ALDH2∗2 polymorphism is associated with a higher susceptibility to arrhythmias.

Conclusions:

  • ALDH2 activation offers a promising therapeutic strategy for cardiac arrhythmias.
  • Targeting ALDH2 may lead to novel and effective antiarrhythmic treatments.
  • Understanding ALDH2's role is crucial for managing cardiovascular disease risk.