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Related Experiment Videos

Dofetilide: a new class III antiarrhythmic agent.

R Al-Dashti1, M Sami

  • 1Division of Cardiology, McGill University Health Centre, Montreal, Canada.

The Canadian Journal of Cardiology
|February 15, 2001
PubMed
Summary

Dofetilide effectively converts atrial and ventricular arrhythmias by prolonging refractory periods. While generally safe, it carries a risk of torsade de pointes, necessitating careful monitoring during treatment.

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Area of Science:

  • Cardiology
  • Pharmacology

Background:

  • Dofetilide is a pure Class III antiarrhythmic agent.
  • It uniquely prolongs refractory period and action potential duration without beta-blocking or calcium channel-blocking effects.

Purpose of the Study:

  • To evaluate the efficacy and safety of dofetilide in treating cardiac arrhythmias.
  • To compare dofetilide with other antiarrhythmic agents.

Main Methods:

  • Administration of dofetilide orally and intravenously.
  • Monitoring of electrocardiogram (ECG) parameters, including QT interval.
  • Assessment of arrhythmia conversion and maintenance of sinus rhythm.

Main Results:

  • Dofetilide demonstrated effectiveness in converting atrial and ventricular arrhythmias, and maintaining sinus rhythm.
  • It showed superiority over flecainide, procainamide, and amiodarone in converting atrial fibrillation and flutter in small studies.
  • Adverse effects included QT interval prolongation and torsade de pointes (3-4% IV, 0.8-1.5% oral).

Conclusions:

  • Dofetilide is an effective antiarrhythmic agent for various arrhythmias, including atrial flutter and fibrillation.
  • Therapy initiation requires in-hospital ECG monitoring due to the risk of torsade de pointes, especially in high-risk patients.
  • Dofetilide appears safe in patients with left ventricular dysfunction and post-myocardial infarction, with no reported extracardiac side effects.

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