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Post-infarct lateral extension-Brody effect or stent thrombosis?

Li Feng1, Zhongyuan Lin1, Yajun Ji1

  • 1Department of Cardiology, Haining People's Hospital, Zhejiang, China.

Journal of Electrocardiology
|May 4, 2025
PubMed
Summary

Recurrent ST-segment elevation after stenting for anterior myocardial infarction may be a Brody effect, not re-infarction. This Brody effect, caused by left ventricular dilation and increased conductivity, mimics lateral infarction on ECGs.

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Area of Science:

  • Cardiology
  • Medical Imaging
  • Electrocardiography

Background:

  • Patients with anterior ST-elevation myocardial infarction (STEMI) treated with left anterior descending artery stenting often present a diagnostic dilemma.
  • Recurrent ST-segment elevation on electrocardiograms (ECGs), especially extending to lateral precordial leads, raises concerns for re-infarction or stent thrombosis.
  • Repeat coronary angiography is frequently performed but often confirms stent patency, suggesting an alternative explanation for ECG changes.

Purpose of the Study:

  • To investigate the cause of recurrent ST-segment elevation in patients after anterior STEMI and stenting.
  • To differentiate between true re-infarction and other phenomena mimicking lateral infarction on ECGs.
  • To explain the electrocardiographic findings in the context of post-infarct cardiac remodeling and electrical properties.

Main Methods:

  • Analysis of ECGs from patients with anterior STEMI post-stenting showing recurrent ST-segment elevation.
  • Correlational analysis between ECG findings, left ventricular dimensions, and cardiac magnetic resonance imaging (CMR) data.
  • Review of literature on Brody effect and electrocardiographic signal amplification.

Main Results:

  • Recurrent ST-segment elevation, particularly with lateral precordial lead involvement, is often associated with a dilated post-infarct left ventricle.
  • This dilation, a consequence of reperfusion injury, leads to increased intracavity blood volume.
  • Increased blood volume enhances the heart's electrical conductivity, causing a Brody effect that mimics lateral infarction and amplifies ECG signals.

Conclusions:

  • The Brody effect, resulting from left ventricular dilation and increased electrical conductivity post-STEMI, can mimic lateral infarction.
  • This phenomenon explains recurrent ST-segment elevation in stented LAD arteries without evidence of re-infarction or stent occlusion.
  • Understanding the Brody effect can help avoid unnecessary repeat coronary angiography, reducing patient risk and healthcare costs.