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Related Experiment Videos

Bidirectional ventricular tachycardia and channelopathy.

Preecha Laohakunakorn1, D Woodrow Benson, Ping Yang

  • 1Bumgrad Hospital, Bangkok, Thailand.

The American Journal of Cardiology
|October 15, 2003
PubMed
Summary

Bidirectional ventricular tachycardia may be a variant of long QT syndrome. Researchers found a common HERG gene variant (R1047L) in two patients, suggesting a genetic link for this heart rhythm disorder.

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Area of Science:

  • Cardiology
  • Genetics
  • Molecular Biology

Background:

  • Bidirectional ventricular tachycardia (BVT) shares electrocardiographic similarities with long QT syndrome (LQTS).
  • Genetic underpinnings of BVT are not fully understood, prompting investigation into potential links with known LQTS genes.

Purpose of the Study:

  • To investigate the genetic basis of bidirectional ventricular tachycardia.
  • To explore the role of long QT syndrome-associated genes in patients with BVT.

Main Methods:

  • Analysis of 4 patients diagnosed with bidirectional ventricular tachycardia.
  • Screening of candidate genes known to cause long QT syndrome.
  • Genetic sequencing and biophysical characterization of identified gene variants.

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Main Results:

  • A common low-penetrance HERG allele, R1047L, was identified in 2 out of 4 patients.
  • This allele demonstrated an intermediate biophysical phenotype in functional studies.
  • The findings suggest a potential genetic contribution of this HERG variant to BVT.

Conclusions:

  • The HERG R1047L allele may contribute to the development of bidirectional ventricular tachycardia.
  • This finding supports the hypothesis that BVT can be a variant of long QT syndrome.
  • Further research is warranted to elucidate the precise role of low-penetrance alleles in cardiac arrhythmias.