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Related Concept Videos

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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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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Action Potential: Phases of Stimulation01:28

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The action potential is a complex electrical event that occurs in excitable cells, such as neurons and muscle cells. It consists of several distinct phases, each with specific characteristics.
Resting Phase:
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The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
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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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Disturbances in Heart Rhythm01:29

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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.
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Repetitive-incessant electrical storm triggered by early repolarization.

Sofia Chatzidou1, Evangelos Repasos1, Sotiris Plastiras1

  • 1Department of Clinical Therapeutics, "Alexandra" Hospital, University of Athens, Athens, Greece.

Annals of Noninvasive Electrocardiology : the Official Journal of the International Society for Holter and Noninvasive Electrocardiology, Inc
|December 6, 2017
PubMed
Summary

Early repolarization syndrome (ERS), once considered benign, can cause life-threatening arrhythmias. This case highlights a malignant ERS variant successfully treated with catheter ablation after drug and ICD failure.

Keywords:
cellular electrophysiology/electropharmocologyelectrophysiology-ventricular tachycardia

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Case Reports

Background:

  • Early repolarization syndrome (ERS) was historically viewed as a benign electrocardiographic variant.
  • Emerging evidence links ERS to an increased risk of sudden cardiac death and life-threatening arrhythmias.
  • The spectrum of ERS clinical manifestations, particularly malignant forms, requires further investigation.

Observation:

  • A case of ERS presented with an exceptionally severe and malignant clinical course.
  • The patient's condition was refractory to all conventional antiarrhythmic drug therapies, including quinidine.
  • Dynamic electrocardiogram (ECG) changes were observed in real-time, preceding polymorphic ventricular tachycardia (VT) and ventricular fibrillation (VF) episodes.

Findings:

  • The malignant ERS variant demonstrated resistance to standard pharmacological interventions.
  • An implantable cardioverter-defibrillator (ICD) was implanted but failed to manage the incessant electrical storm (ES), requiring deactivation after 6 months.
  • Catheter ablation emerged as the definitive and successful treatment modality for this refractory malignant ERS.

Implications:

  • This case underscores the potential for ERS to manifest as a life-threatening condition.
  • It highlights the limitations of current antiarrhythmic drugs and ICDs in managing extreme ERS cases.
  • Catheter ablation should be considered a viable therapeutic option for malignant ERS refractory to other treatments.