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Ion channels and ventricular arrhythmias: cellular and ionic mechanisms underlying the Brugada syndrome

C Antzelevitch1

  • 1Masonic Medical Research Laboratory, Utica, New York 13501, USA. ca@mmrl.edu

Current Opinion in Cardiology
|June 8, 1999
PubMed

Insights

Brugada syndrome, a genetic heart condition, causes dangerous arrhythmias and sudden death. It is linked to the SCN5A gene and abnormal sodium channel function.

Area of Science:

  • Cardiology
  • Genetics
  • Electrophysiology

Background:

  • Brugada syndrome presents with ST segment elevation in right precordial leads (V1-V3), normal QT intervals, and right bundle branch block.
  • It is associated with sudden cardiac death, particularly in Asian males, and follows an autosomal dominant inheritance pattern.
  • The SCN5A gene, encoding a cardiac sodium channel, is the primary gene linked to Brugada syndrome.

Purpose of the Study:

  • To discuss the cellular and ionic mechanisms underlying Brugada syndrome.
  • To explore the role of sodium channel dysfunction in the syndrome's pathophysiology.

Main Methods:

  • Review of existing literature on Brugada syndrome.
  • Analysis of cellular and ionic mechanisms related to cardiac sodium channels.

Main Results:

  • Brugada syndrome is characterized by specific ECG abnormalities and risk of sudden cardiac death.
  • The SCN5A gene mutation affects cardiac sodium channel function.
  • Sodium channel blockade can induce repolarization dispersion, creating a substrate for arrhythmias.

Conclusions:

  • Abnormal sodium channel function, particularly via blockade, is implicated in Brugada syndrome.
  • Epicardial and transmural dispersion of repolarization may underlie ventricular arrhythmias in Brugada syndrome.
  • Further research into the cellular and ionic basis is crucial for understanding and managing Brugada syndrome.

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