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Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers

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...

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Related Experiment Video

Updated: Jul 2, 2026

Laser-Induced Action Potential-Like Measurements of Cardiomyocytes on Microelectrode Arrays for Increased Predictivity of Safety Pharmacology

Laser-Induced Action Potential-Like Measurements of Cardiomyocytes on Microelectrode Arrays for Increased Predictivity of Safety Pharmacology

Published on: September 13, 2022

Can etomidate have antiarrhythmic properties?

Wanda L Rivera-Bou¹, Francisco Torres-Galarza, Solisis Deynes

¹University of Puerto Rico School of Medicine, Emergency Department.

Boletin De La Asociacion Medica De Puerto Rico

|September 2, 2008

Summary

This summary is machine-generated.

Etomidate, used for rapid sequence intubation, showed potential antiarrhythmic effects in a patient with unstable wide complex tachycardia. This case highlights a possible new therapeutic application for etomidate beyond sedation.

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

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

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Last Updated: Jul 2, 2026

Laser-Induced Action Potential-Like Measurements of Cardiomyocytes on Microelectrode Arrays for Increased Predictivity of Safety Pharmacology

Laser-Induced Action Potential-Like Measurements of Cardiomyocytes on Microelectrode Arrays for Increased Predictivity of Safety Pharmacology

Published on: September 13, 2022

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

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

Area of Science:

Anesthesiology
Emergency Medicine
Cardiology

Background:

Etomidate is a widely used anesthetic agent for Rapid Sequence Intubation (RSI) and Procedural Sedation Anesthesia (PSA) due to its rapid onset and favorable cardiovascular safety profile.
Its primary applications are in emergency and critical care settings.

Observation:

A patient presented with hemodynamically unstable wide complex tachycardia.
Etomidate was administered for sedation during the emergent management of this cardiac arrhythmia.

Findings:

Immediate conversion of the unstable wide complex tachycardia to normal sinus rhythm was observed post-etomidate administration.
This observation suggests a potential direct antiarrhythmic effect of etomidate.

Implications:

This case report is the first to describe etomidate's possible antiarrhythmic properties in the Emergency Medicine literature.
Further research is warranted to investigate the antiarrhythmic mechanisms and potential clinical utility of etomidate in managing specific cardiac arrhythmias.