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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.
921
Disturbances in Heart Rhythm01:28

Disturbances in Heart Rhythm

957
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...
957
ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

216
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,...
216
Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

4.4K
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...
4.4K
Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers01:24

Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers

746
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...
746
Decreased pulse rate01:14

Decreased pulse rate

544
Bradycardia is a medical condition in which the heart rate is slower than normal. It occurs when the heart's natural pacemaker, the sinus node, generates slower electrical impulses than the standard rhythm. In adults, bradycardia is diagnosed when the pulse rate falls below 60 beats per minute, indicating a deviation from the normal heart rate range.
There are specific risk factors that can elevate the likelihood of developing bradycardia. Advanced age is a significant factor, with...
544

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Related Experiment Video

Updated: Jul 4, 2025

Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus
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Arrhythmias and Sudden Cardiac Death.

Scott Bragg1, Brandon Brown2, Alexei O DeCastro2

  • 1Department of Clinical Pharmacy and Outcomes Sciences, Medical University of South Carolina (MUSC) College of Pharmacy and MUSC College of Medicine, 173 Ashley Avenue, CP 240, MSC 141, Charleston, SC 29425, USA; Medical University of South Carolina (MUSC) College of Medicine, MUSC Department of Family Medicine, 135 Cannon Street, Suite 405, Charleston, SC 29425, USA.

Primary Care
|January 26, 2024
PubMed
Summary
This summary is machine-generated.

Ventricular tachyarrhythmias are a leading cause of sudden cardiac death. Prevention involves healthy living and prompt treatment, with implantable cardioverter-defibrillators offering superior secondary prevention for sudden cardiac arrest survivors.

Keywords:
AntiarrhythmicsArrhythmiasCardiopulmonary resuscitationDefibrillationImplantable cardioverter-defibrillatorsSudden cardiac death

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Preventive Medicine

Background:

  • Ventricular tachyarrhythmias are a primary cause of sudden cardiac arrest (SCA) and subsequent sudden cardiac death (SCD).
  • Effective prevention and management strategies are crucial for reducing mortality associated with these arrhythmias.

Purpose of the Study:

  • To outline primary and secondary prevention strategies for sudden cardiac death (SCD) caused by ventricular tachyarrhythmias.
  • To discuss the roles of lifestyle modifications, guideline adherence, comorbidity management, and therapeutic interventions.

Main Methods:

  • Review of current guidelines and evidence for primary prevention of SCD.
  • Analysis of treatment options for patients experiencing or at high risk for ventricular tachyarrhythmias.
  • Comparison of implantable cardioverter-defibrillators (ICDs) versus pharmacologic therapy for secondary prevention.

Main Results:

  • Primary prevention emphasizes healthy lifestyle, adherence to cardiovascular guidelines, and managing comorbid conditions.
  • Early cardiopulmonary resuscitation and defibrillation are critical for immediate management of SCA.
  • Implantable cardioverter-defibrillators demonstrate greater efficacy in secondary prevention than drug therapy alone.
  • Antiarrhythmic medications (amiodarone, beta-blockers, sotalol) can serve as adjuncts to reduce SCD risk and manage symptoms.

Conclusions:

  • A multi-faceted approach combining primary prevention, prompt emergency response, and tailored secondary prevention is essential for combating SCD.
  • Implantable cardioverter-defibrillators are a cornerstone of secondary prevention, with medications playing a supportive role.