Long-term evaluation of early repolarization syndrome (normal variant RS-T segment elevation)

Area of Science:

• Cardiology
• Electrophysiology

Background:

• Early repolarization syndrome is a common electrocardiographic finding.
• It is often considered a normal variant but can mimic serious cardiac pathologies.

Purpose of the Study:

• To delineate the specific electrocardiographic features of early repolarization syndrome.
• To evaluate the natural history of this electrocardiographic entity over an extended follow-up period.

Main Methods:

• Analysis of electrocardiograms from 65 patients diagnosed with early repolarization syndrome.
• Maximal patient follow-up extended to 26 years.

Main Results:

• Key features include upward concave RS-T segment elevation with J waves, slurred R waves, and prominent J points, particularly in precordial leads.
• RS-T elevation was most distinct in precordial leads, showing rapid QRS transition and counterclockwise rotation.
• These electrocardiographic characteristics persisted for many years, though intraindividual changes were observed.
• Less common findings included tall R and T waves, labile T wave patterns, pseudo-R waves, and isolated T negativity syndrome.

Conclusions:

• Early repolarization syndrome exhibits a consistent set of electrocardiographic features.
• The syndrome's characteristics can simulate various cardiac conditions, including pericarditis, myocardial ischemia, left ventricular hypertrophy, and right bundle branch block.
• Long-term follow-up confirms the persistence of these electrocardiographic patterns, highlighting its nature as a distinct electrocardiographic entity.