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Cardiac Action Potential01:30

Cardiac Action Potential

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Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
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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

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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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Mechanism of Cardiac Arrhythmias01:28

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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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Dysrhythmias III: Characteristics of Dysrhythmias01:29

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Dysrhythmias, also known as arrhythmias, are irregular heart rhythms that result from abnormal electrical activity in the heart, affecting its ability to circulate blood efficiently. Tachyarrhythmias, a subset of dysrhythmias, are characterized by abnormally fast heart rates exceeding 100 beats per minute. Here are some types of tachyarrhythmias with their distinct ECG features:Sinus Tachycardia:Sinus tachycardia presents a regular heart rhythm with an increased rate of 101-180 beats per...
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Dysrhythmias I: Introduction01:15

Dysrhythmias I: Introduction

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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...
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Updated: Feb 16, 2026

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Malignant Early Repolarization.

Elias B Hanna1, Paul A LeLorier1, David M Tadin1

  • 1Section of Cardiology, Department of Medicine, Louisiana State University Health Sciences Center and University Medical Center New Orleans, New Orleans, Louisiana.

The American Journal of Cardiology
|December 24, 2017
PubMed
Summary

Young adults experiencing ventricular fibrillation require prompt diagnosis of underlying causes. This case highlights structural and electrical triggers, emphasizing early repolarization patterns.

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Genetics

Background:

  • Ventricular fibrillation (VF) in young individuals is rare but life-threatening.
  • Identifying underlying causes is crucial for preventing recurrence and sudden cardiac death.
  • Early repolarization syndromes are increasingly recognized as a potential cause of VF in the young.

Observation:

  • A 27-year-old male presented with successfully resuscitated ventricular fibrillation.
  • The patient's presentation prompted a comprehensive diagnostic workup for structural and electrical cardiac abnormalities.
  • Electrocardiographic analysis revealed specific features suggestive of malignant early repolarization.

Findings:

  • The diagnostic strategy involved evaluating both congenital structural heart defects and inherited electrical channelopathies.
  • Specific electrocardiographic patterns associated with malignant early repolarization were identified.
  • The case underscores the importance of considering electrical causes, particularly early repolarization, in young patients with VF.

Implications:

  • Early recognition and diagnosis of malignant early repolarization can guide appropriate management and genetic counseling.
  • A systematic diagnostic approach is essential for identifying the etiology of VF in young patients.
  • This case contributes to understanding the spectrum of causes for sudden cardiac arrest in young adults.