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A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
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On the nonpathological nature of ST-segment elevation in lateral leads in patients with CRBBB

John E Madias1,2

  • 1Icahn School of Medicine at Mount Sinai, New York, New York, USA.

Pacing and Clinical Electrophysiology : PACE
|February 10, 2021
PubMed

Insights

Stable ST-segment elevation in lateral ECG leads with complete right bundle branch block (CRBBB) is a common, non-pathological finding. These changes are secondary to intraventricular conduction delays and do not indicate myocardial infarction or other acute conditions.

Area of Science:

  • Cardiology
  • Electrocardiography
  • Medical Diagnostics

Background:

  • Complete right bundle branch block (CRBBB) is a common electrocardiogram (ECG) finding.
  • Stable ST-segment elevation (STSE) in lateral leads (I, II, aVL, V5, V6) can occur with CRBBB.
  • Automated ECG algorithms may misinterpret these findings.

Observation:

  • STSE in lateral leads mirrors ST depression in anterior leads (V1-V3) in CRBBB.
  • These are secondary ECG changes due to intraventricular conduction delays.
  • The STSE polarity is opposite to the terminal QRS vector.

Findings:

  • Lateral STSE in CRBBB is a non-pathological, expected secondary ECG phenomenon.
  • It is not indicative of lateral myocardial infarction, ischemia, injury, pericarditis, or early repolarization.
  • Automated interpretation systems often incorrectly flag these findings.

Implications:

  • Reassures clinicians about the benign nature of lateral STSE in CRBBB.
  • Reduces unnecessary diagnostic workups and associated costs.
  • Improves accuracy of ECG interpretation in patients with CRBBB.

Keywords:
ElecrocardiogramST-segment depressionST-segment elevationelectrophysiologyright bundle branch block

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