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Updated: Aug 15, 2025

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
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The Primary Alteration of Ventricular Myocardium Conduction: The Significant Determinant of Left Bundle Branch Block

Ljuba Bacharova1, Bayes de Luna2

  • 1International Laser Center CVTI, Bratislava, Slovakia.

Cardiology Research and Practice
|January 2, 2023
PubMed

Insights

Intraventricular conduction disturbances (IVCD) are often linked to the His-Purkinje system. This paper highlights the crucial role of the working ventricular myocardium in causing left bundle branch block patterns (LBBB).

Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Diagnostics

Background:

  • Intraventricular conduction disturbances (IVCD) are established ECG diagnostic categories.
  • Current understanding primarily attributes IVCD mechanisms to His-Purkinje (HP) system alterations.
  • The role of the working ventricular myocardium in IVCD is often overlooked.

Purpose of the Study:

  • To emphasize the significance of ventricular working myocardium alterations in IVCD.
  • To focus on the mechanisms leading to the common left bundle branch block (LBBB) pattern.
  • To underscore the clinical importance of understanding LBBB mechanisms for prognosis and therapy.

Main Methods:

  • This is an opinion paper, not based on experimental data.
  • It reviews existing literature and proposes a shift in mechanistic understanding.
  • Focuses on theoretical and clinical implications of myocardial involvement.

Main Results:

  • Proposes that alterations in the working ventricular myocardium are a significant cause of LBBB patterns.
  • Challenges the exclusive focus on His-Purkinje system pathology for IVCD.
  • Suggests a broader perspective on the pathophysiology of LBBB.

Conclusions:

  • Recognizing the ventricular myocardium's role in LBBB is clinically vital.
  • This understanding impacts patient prognosis assessment.
  • It is crucial for guiding decisions regarding cardiac resynchronization therapy (CRT).

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