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The QT interval and torsade de pointes.

A J Moss1

  • 1University of Rochester Medical Center, New York, USA.

Drug Safety
|December 22, 1999
PubMed
Summary

Prolonged QT interval on ECGs increases risk of dangerous heart rhythms like torsade de pointes. Certain drugs can prolong the QT interval by affecting potassium currents, necessitating careful risk assessment.

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Area of Science:

  • Cardiology
  • Pharmacology
  • Electrophysiology

Background:

  • The QT interval on the electrocardiogram (ECG) represents ventricular depolarization and repolarization.
  • Factors influencing QT interval include heart rate, autonomic tone, electrolytes, age, and gender.
  • A prolonged QT interval is a significant risk factor for potentially fatal ventricular tachyarrhythmias, specifically torsade de pointes.

Purpose of the Study:

  • To review the causes and implications of QT interval prolongation.
  • To highlight the role of various drugs in inducing QT prolongation and torsade de pointes.
  • To emphasize the importance of considering drug-induced QT prolongation risks.

Main Methods:

  • Literature review of studies on QT interval, torsade de pointes, and drug effects.
  • Analysis of mechanisms by which drugs prolong the QT interval, focusing on ion channel effects.
  • Examination of drug interactions that potentiate QT prolongation.

Main Results:

  • Primary QT prolongation can be congenital or idiopathic; acquired causes include diseases, drugs, and toxins.
  • Drugs implicated in torsade de pointes include antiarrhythmics, antibacterials, psychotropics, and antihistamines.
  • Drug-induced QT prolongation often involves depression of the rapidly activating delayed rectifier potassium current (I(Kr)) or inhibition of its metabolism (e.g., via CYP450 3A4).

Conclusions:

  • Torsade de pointes is a life-threatening arrhythmia.
  • Careful consideration of the risks associated with administering drugs known to prolong the QT interval is crucial.
  • Understanding drug mechanisms and interactions is vital for preventing drug-induced torsade de pointes.

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