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J wave syndromes: a decade of progress.

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J wave syndromes, including early repolarization syndrome and Brugada syndrome, are characterized by prominent electrocardiographic J waves. These syndromes share a common mechanism involving amplified ion currents, increasing the risk of ventricular fibrillation.

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Genetics

Background:

  • J wave syndromes encompass a spectrum of conditions including early repolarization syndrome (ERS) and Brugada syndrome (BrS).
  • These syndromes are characterized by prominent J waves on the electrocardiogram (ECG).
  • They can be inherited or acquired and are linked to specific ion channel dysfunction.

Purpose of the Study:

  • To provide a historical overview of J wave syndromes.
  • To summarize current knowledge on their molecular, ionic, and cellular mechanisms.
  • To discuss clinical features, ongoing debates, and future research directions.

Main Methods:

  • Comprehensive literature review of PubMed using keywords: "J wave syndromes", "early repolarization syndrome (ERS)", "Brugada syndrome (BrS)", and "ST-segment elevation myocardial infarction (STEMI)".
  • Inclusion of original articles, reviews, and other relevant literature without date restrictions.

Main Results:

  • J wave syndromes, first defined a decade ago, present with prominent ECG J waves, including ERS, BrS, and ventricular fibrillation (VF) associated with hypothermia and STEMI.
  • These syndromes are mechanistically linked to amplified transient outward current (Ito)-mediated J waves, potentially causing phase 2 reentry and initiating VF.
  • J wave syndromes can be inherited or acquired.

Conclusions:

  • J wave syndromes are newly recognized clinical entities sharing common mechanisms and marked by ECG J waves and VF risk.
  • Identifying at-risk patients for sudden cardiac death is a clinical challenge.
  • Developing alternative therapeutic strategies to reduce mortality is crucial.