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Related Experiment Videos

Torsade de pointes.

Nabil El-Sherif1, Gioia Turitto

  • 1Department of Medicine, Division of Cardiology, State University of New York Downstate Medical Center, Box 1199, 450 Clarkson Avenue, Brooklyn, NY 11203, USA. nelsherif@aol.com

Current Opinion in Cardiology
|December 24, 2002
PubMed
Summary
This summary is machine-generated.

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Long QT syndrome, a heart rhythm disorder, arises from ion channel abnormalities affecting ventricular repolarization. Understanding its molecular basis and genetic links is key to managing torsade de pointes risks.

Area of Science:

  • Cardiology
  • Molecular Biology
  • Electrophysiology

Background:

  • Long QT syndrome (LQTS) involves abnormalities in ionic currents crucial for ventricular repolarization.
  • Both congenital and acquired forms of LQTS stem from intrinsic or external factors impacting these currents.

Purpose of the Study:

  • To review the molecular biology of congenital LQTS.
  • To list pharmacologic agents linked to acquired LQTS.
  • To describe the electrophysiologic mechanisms of torsade de pointes (TdP) in LQTS.

Main Methods:

  • Review of existing literature on LQTS molecular biology and genetics.
  • Analysis of pharmacologic agents causing QT prolongation.
  • Description of in vivo electrophysiologic mechanisms using a canine model (anthopleurin-A).

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Main Results:

  • Congenital LQTS is linked to specific genetic mutations and ion channel dysfunction.
  • Acquired LQTS is associated with various drugs affecting cardiac repolarization.
  • Torsade de pointes exhibits characteristic associations with T-wave alternans and short-long cardiac sequences.

Conclusions:

  • Understanding LQTS molecular basis and genetics is vital for predicting and managing TdP risk.
  • Careful risk-benefit assessment is crucial before prescribing drugs that prolong the QT interval.
  • Further research into genetic mutations beyond LQTS is expanding knowledge of polymorphic ventricular tachyarrhythmias.