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Related Concept Videos

Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers01:12

Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers

Class III antiarrhythmic drugs are a group of medications that can prolong action potentials in the heart. They achieve this by blocking potassium channels or enhancing inward currents from sodium channels. However, these drugs have a unique property of "reverse use-dependence," which is most pronounced at slower heart rates and can lead to torsades de pointes—a specific type of arrhythmia. However, it is essential to note that excessive QT interval prolongation—a measure of the heart's...
Dysrhythmias II: Classification of Tachyarrhythmias01:28

Dysrhythmias II: Classification of Tachyarrhythmias

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...
Dysrhythmias VI: Management of Dysrhythmias01:25

Dysrhythmias VI: Management of Dysrhythmias

Dysrhythmia management involves a multifaceted approach, incorporating pharmacological treatments, medical procedures, surgical interventions, lifestyle modifications, and patient education.Pharmacological ManagementAntiarrhythmic Drugs:Class I (Sodium Channel Blockers): This class includes quinidine and procainamide, which reduce the speed of impulse conduction in the heart, stabilize the cardiac membrane, and control arrhythmias. Quinidine and procainamide are Class IA agents that prolong the...
Desensitization and Tachyphylaxis01:20

Desensitization and Tachyphylaxis

Tachyphylaxis is described as a rapid decrease in response to a drug after repeated or continuous administration of the same drug dose. It is a phenomenon where the body becomes less responsive to a particular substance or intervention over time, requiring higher doses or stronger interventions to achieve the same effect. It results from adaptive changes in the body's receptors, signaling pathways, or physiological processes that occur in response to prolonged exposure to a stimulus.
Several...
Cardiomyopathy II: Dilated Cardiomyopathy01:30

Cardiomyopathy II: Dilated Cardiomyopathy

Dilated cardiomyopathy, or DCM, is a progressive myocardial disorder characterized by ventricular chamber dilation and contractile dysfunction.EtiologyVarious factors can cause DCM, including hypertension and heavy alcohol intake, which contribute to the weakening and enlargement of the heart muscle. Viral infections, such as Coxsackievirus B, adenoviruses, and influenza, can lead to DCM by causing inflammation and damage to heart tissue. Certain chemotherapeutic agents, including daunorubicin,...
Cardiac Action Potential01:30

Cardiac Action Potential

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.
Ionic Basis of Cardiac Action Potentials

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Related Experiment Video

Updated: May 23, 2026

Ablation of Ischemic Ventricular Tachycardia Using a Multipolar Catheter and 3-dimensional Mapping System for High-density Electro-anatomical Reconstruction
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Degenerating regenerating torsades de pointes.

Mark Jonathan Perrin1, Michael Howard Gollob, David Hugh Birnie

  • 1Ottawa Heart Institute, University of Ottawa, Ottawa, Canada. mperrin@ottawaheart.ca

Pacing and Clinical Electrophysiology : PACE
|April 4, 2012
PubMed
Summary

This case report details Torsades de pointes (TdP) degenerating into ventricular fibrillation (VF) and then spontaneously resolving. It suggests shared mechanisms may underlie both TdP and VF maintenance.

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Case Reports

Background:

  • Ventricular fibrillation (VF) is a life-threatening arrhythmia with a high mortality rate.
  • Spontaneous termination of VF is rare, with most cases resulting in death.
  • Torsades de pointes (TdP), a polymorphic ventricular tachycardia, typically self-terminates.

Observation:

  • A unique case of TdP degenerating into VF was observed.
  • The ventricular fibrillation then reorganized back into TdP.
  • The entire event spontaneously terminated without intervention.

Findings:

  • The observed sequence suggests potential overlap in the mechanisms sustaining TdP and VF.
  • This case challenges the notion of entirely distinct pathophysiological pathways for these arrhythmias.

Implications:

  • Understanding shared mechanisms could lead to novel therapeutic strategies for both TdP and VF.
  • Further research into arrhythmia dynamics and termination is warranted.
  • This case highlights the complex and sometimes unpredictable behavior of cardiac arrhythmias.