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Updated: Feb 27, 2026

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Myocardial Infarction in a Patient With Left Bundle Branch Pacing

Shengjia Sun1, Alimujiang Maimaitijiang1

  • 1Department of Cardiovascular Disease, Huashan Hospital, Shanghai, China.

JACC. Case Reports
|February 26, 2026
PubMed

Insights

Left bundle branch pacing can mask acute myocardial infarction. A decrease in QRS amplitude, not ST-segment changes, signaled a critical blockage, necessitating urgent angiography.

Area of Science:

  • Cardiology
  • Medical Diagnostics

Background:

  • Pacing rhythms, such as left bundle branch pacing (LBBP), can complicate the diagnosis of acute myocardial infarction (AMI).
  • Standard electrocardiogram (ECG) findings for AMI may be altered in patients with LBBP.
Abstract

Keywords:
QRS amplitudeemergency angiographyleft bundle branch pacingmyocardial infarction

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