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Related Concept Videos

Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

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.
Dysrhythmias I: Introduction01:15

Dysrhythmias I: Introduction

Dysrhythmias refers to abnormalities in the heart's rhythm. They result from disruptions in the heart's electrical conduction system, which includes the sinoatrial(SA)node, atrioventricular(AV) node, the bundle of His, bundle branches, and Purkinje fibers.Definition and PathophysiologyDysrhythmias result from disorders of impulse formation, impulse conduction, or both. The heart contains specialized cells in the sinoatrial node, atrioventricular node, and the bundle of His and Purkinje fibers...
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 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,...
Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

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 of...
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: Jun 1, 2026

Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus
08:28

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

Published on: April 5, 2011

Electrolyte disorders and arrhythmogenesis.

Nabil El-Sherif1, Gioia Turitto

  • 1State University of NY, Downstate Medical Center and NY Harbor VA Healthcare System, Brooklyn, NY, USA. nelsherif@aol.com

Cardiology Journal
|June 11, 2011
PubMed
Summary
This summary is machine-generated.

Electrolyte imbalances like potassium, calcium, and magnesium disorders significantly impact heart function, altering cardiac ionic currents and potentially causing arrhythmias. Understanding these effects is crucial for managing cardiac health.

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Electrocardiogram Recordings in Anesthetized Mice using Lead II
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Electrocardiogram Recordings in Anesthetized Mice using Lead II

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Last Updated: Jun 1, 2026

Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus
08:28

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

Published on: April 5, 2011

Electrocardiogram Recordings in Anesthetized Mice using Lead II
04:16

Electrocardiogram Recordings in Anesthetized Mice using Lead II

Published on: June 20, 2020

Area of Science:

  • Cardiology
  • Electrophysiology
  • Internal Medicine

Background:

  • Electrolyte disorders can profoundly influence cardiac electrophysiology, leading to proarrhythmic or antiarrhythmic outcomes.
  • Potassium (K⁺) and calcium (Ca²⁺) imbalances are common and have significant electrocardiographic (ECG) and clinical consequences.

Purpose of the Study:

  • To review the mechanisms, electrophysiological (EP), electrocardiographic (ECG), and clinical consequences of common electrolyte disorders.
  • To highlight the specific effects of hypokalemia, hyperkalemia, hypocalcemia, hypercalcemia, and magnesium disorders on cardiac function.

Main Methods:

  • Review of existing literature on electrolyte disorders and their cardiac implications.
  • Analysis of electrophysiological and electrocardiographic findings associated with various electrolyte abnormalities.
  • Discussion of clinical consequences and management strategies, including drug interactions.

Main Results:

  • Hypokalemia can prolong action potential duration and QT interval, increasing the risk of Torsades de Pointes (TdP VT), especially with certain drugs.
  • Hyperkalemia manifests with distinct ECG changes based on serum K⁺ levels, ranging from peaked T waves to life-threatening arrhythmias.
  • Hypocalcemia prolongs QT interval, while hypercalcemia shortens it; magnesium administration can terminate TdP VT.
  • Sodium abnormalities generally have minimal electrophysiological significance.

Conclusions:

  • Electrolyte disorders, particularly potassium and calcium imbalances, are critical determinants of cardiac electrical stability.
  • Recognition of specific ECG patterns associated with electrolyte disturbances is essential for timely diagnosis and intervention.
  • Management of electrolyte disorders is vital for preventing serious cardiac arrhythmias and improving patient outcomes.