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Related Concept Videos

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The cardiac conduction system produces and transmits electrical impulses that prompt myocardial contraction, ensuring efficient heart function. This intricate system ensures that the heart beats in a coordinated and efficient manner, beginning with the atria and then the ventricles. The conduction system optimizes cardiac output by maintaining this precise sequence, which is crucial for adequate blood circulation.
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Introduction
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Related Experiment Video

Updated: Feb 28, 2026

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
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Distance Between the Electrode Tip and the Left Ventricular Conduction System During Left Bundle Branch Area Pacing.

Fan Zhang1, Wei Ma1, Shaobo Fan1

  • 1Chest Hospital, Tianjin University, Tianjin, China.

Journal of Cardiovascular Electrophysiology
|February 27, 2026
PubMed
Summary
This summary is machine-generated.

Left bundle branch area pacing (LBBAP) achieves conduction system (CS) capture when electrode tips are within 2mm of the left ventricular conduction system (LVCS). This precise placement optimizes pacing parameters and reduces QRS duration.

Keywords:
electroanatomic mappingelectrode implantation depthleft bundle branch area pacingleft bundle branch pacingleft fascicular pacingleft ventricular conduction system

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Pacing

Background:

  • Left bundle branch area pacing (LBBAP) is a physiological pacing technique.
  • Conduction system (CS) capture is achievable even without detectable CS potential.
  • Accurate electrode placement is crucial for effective LBBAP.

Purpose of the Study:

  • To measure the distance between the electrode tip and the left ventricular conduction system (LVCS) during LBBAP.
  • To evaluate the impact of electrode-LVCS distance on pacing parameters.
  • To determine the optimal distance for successful CS capture.

Main Methods:

  • Sixteen canines were divided into conduction system pacing (CSP) and left ventricular septal pacing (LVSP) groups.
  • A 3D electroanatomical mapping (EAM) system visualized the LVCS and guided electrode implantation.
  • Pathological specimens measured electrode tip-to-LVCS distance, implantation depth, and angle.

Main Results:

  • The CSP group (including LBBAP and left fascicular pacing) showed an electrode tip-to-LVCS distance ≤ 2mm.
  • Significant differences were observed in stimulus-to-left ventricular activation time (Stim-LVAT), Stim-Retro-His interval, and QRS duration between groups.
  • The CSP group exhibited shorter Stim-LVAT (48.75 ± 2.38 ms vs. 59.75 ± 2.05 ms) and QRS duration (89.50 ± 4.34 ms vs. 109.88 ± 5.96 ms).

Conclusions:

  • Successful CS capture was achieved when the electrode tip-to-LVCS distance was ≤ 2mm.
  • Optimal capture occurred at pacing outputs of ≤ 1.5 V/0.5 ms with this proximity.
  • This study quantifies the critical distance for effective LBBAP and CS capture.