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Abnormal Conduction-Induced Cardiomyopathy: JACC Review Topic of the Week

Jose F Huizar1, Karoly Kaszala1, Alex Tan1

  • 1Department of Internal Medicine, Cardiology Division, Central Virginia VA Health Care System, Richmond Veterans Affairs Medical Center, Richmond, Virginia, USA; Department of Internal Medicine, Cardiology Division/Pauley Heart Center, Virginia Commonwealth University, Richmond, Virginia, USA.

Journal of the American College of Cardiology
|March 22, 2023
PubMed

Insights

Abnormal conduction-induced cardiomyopathies, including those from left bundle branch block, can cause heart dysfunction. Early diagnosis and treatment can reverse this, improving heart function and reducing mortality.

Area of Science:

  • Cardiology
  • Electrophysiology

Background:

  • Nonischemic cardiomyopathies are common and can be reversible.
  • Chronic right ventricular pacing-induced cardiomyopathy is a known entity.
  • Left bundle branch block and pre-excitation are emerging as reversible causes of cardiomyopathy.

Purpose of the Study:

  • To review abnormal conduction-induced cardiomyopathies.
  • To update knowledge on mechanisms, diagnosis, and management.
  • To highlight knowledge gaps in this field.

Main Methods:

  • Review of existing literature on cardiomyopathies related to abnormal ventricular conduction.
  • Analysis of mechanisms linking abnormal propagation to ventricular dyssynchrony.
  • Synthesis of diagnostic and management strategies.

Main Results:

  • Abnormal ventricular propagation, characterized by wide QRS duration and left bundle branch block pattern, leads to ventricular dyssynchrony.
  • This dyssynchrony is detectable via cardiac imaging.
  • Appropriate interventions improve left ventricular ejection fraction and functional class.

Conclusions:

  • Abnormal conduction-induced cardiomyopathies are a significant cause of reversible heart dysfunction.
  • Timely diagnosis and treatment can improve patient outcomes, reducing morbidity and mortality.
  • Further research is needed to address current knowledge gaps.

Keywords:
RV pacingcardiomyopathyheart failureleft bundle branch blockleft ventricular dysfunctionpre-excitation syndrome

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