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Related Experiment Video

Updated: Jun 11, 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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New-Onset Left Ventricular Dysfunction After Left Bundle Branch Pacing.

Shunmuga Sundaram Ponnusamy1, Vithiya Ganesan2, Sudharshana Nagalingam3

  • 1Department of Cardiology, Velammal Medical College Hospital and Research Institute, Madurai, India.

JACC. Clinical Electrophysiology
|September 28, 2024
PubMed
Summary

New-onset left ventricular dysfunction (NOLVD) occurred in 3.75% of patients after left bundle branch pacing (LBBP). Most cases were due to reversible causes like loss of conduction system capture, highlighting the need for regular device monitoring.

Keywords:
atrio-ventricular delayleft bundle branch pacingloss of conduction system capturenew-onset left ventricular dysfunction

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Heart Failure

Background:

  • Left bundle branch pacing (LBBP) is a pacing technique offering stable parameters, considered an alternative to traditional right ventricular pacing.
  • LBBP is also explored as a method for cardiac resynchronization therapy in heart failure patients.

Purpose of the Study:

  • To determine the incidence and causes of new-onset left ventricular dysfunction (NOLVD) after LBBP.
  • To investigate NOLVD in patients with initially normal left ventricular (LV) function and those with previously impaired but normalized LV function.

Main Methods:

  • A cohort of 426 patients undergoing successful LBBP for symptomatic bradyarrhythmia or CRT were analyzed.
  • Patients were categorized into those with baseline normal LV function and those with normalized LV function post-LBBP.
  • Loss of conduction system capture (LOCSC) was defined by loss of the right bundle branch block pattern and capture transition during threshold testing.

Main Results:

  • New-onset left ventricular dysfunction (NOLVD) was observed in 3.75% of patients (16 out of 426).
  • The primary cause of NOLVD was loss of conduction system capture (LOCSC) in 62.5% of cases.
  • Reinterventions, including lead repositioning and AV delay optimization, successfully restored LV function in all affected patients.

Conclusions:

  • New-onset left ventricular dysfunction (NOLVD) can occur after left bundle branch pacing (LBBP), even in patients with previously normal or recovered LV function.
  • Reversible causes, particularly loss of conduction system capture (LOCSC), are significant contributors to NOLVD.
  • Regular follow-up assessments in device clinics are crucial for early detection and management of NOLVD following LBBP.