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Dysrhythmias VI: Management of Dysrhythmias01:25

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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...
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Autorhythmicity is a term that refers to the heart's inherent ability to generate electrical signals and instigate muscle contractions. This self-regulating conduction system within the heart consists of two key components: the pacemaker cells and specialized conducting cells.
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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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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...
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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...
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Class IV antiarrhythmic drugs, such as verapamil and diltiazem, block calcium channels. They primarily affect the heart, slowing the conduction in calcium-dependent tissues like the SA and AV nodes. These drugs manage reentrant supraventricular tachycardia (SVT) and reduce ventricular rate in atrial flutter/fibrillation.
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Updated: Sep 12, 2025

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Comprehensive Conduction System Pacing as Antiarrhythmic Strategy in Atrial Fibrillation.

Nicole Habel1, Raihan Kabir1, Markus Meyer2

  • 1Department of Medicine, Larner College of Medicine, University of Vermont, Burlington, Vermont, USA.

JACC. Case Reports
|August 8, 2025
PubMed
Summary
This summary is machine-generated.

The pace-and-wait strategy, using advanced pacemaker technology, offers a novel antiarrhythmic treatment for atrial fibrillation (AF). This approach optimizes cardiac function and reduces symptoms by managing intracardiac pressures and improving conduction.

Keywords:
AV node ablationBachmann bundle pacingaccelerated pacingatrial fibrillationconduction system pacingindividualized heart rate

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Devices

Background:

  • Elevated intracardiac filling pressures promote atrial fibrillation (AF).
  • Accelerated lower rate pacing may reduce filling pressures, potentially acting as an antiarrhythmic treatment.

Observation:

  • A patient with persistent AF, previously managed with flecainide, received a dual-chamber pacemaker with specialized atrial and ventricular leads.
  • Individualized accelerated resting heart rate pacing at 80 bpm was initiated post-implantation.

Findings:

  • The patient achieved sinus rhythm 18 days post-implant and maintained it for 8 months.
  • This approach eliminated the need for atrioventricular node ablation and resolved symptoms.

Implications:

  • The pace-and-wait strategy, utilizing Bachmann bundle and His bundle pacing, offers sustained rhythm control for AF.
  • This method addresses interatrial conduction delay, interventricular dyssynchrony, and optimizes hemodynamics, providing an alternative to pharmacologic rate control.