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Related Experiment Videos

Effect of ablation pattern on mechanical function in the atrium.

Thien-Khoi N Phung1, Christian B Moyer1, Patrick T Norton2

  • 1Department of Biomedical Engineering, University of Virginia, Charlottesville, VA.

Pacing and Clinical Electrophysiology : PACE
|April 4, 2017
PubMed
Summary
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Catheter ablation for atrial fibrillation (AF) creates scar tissue, impacting left atrial mechanics. Computational models show ablation scar reduces active emptying and depresses wall motion, with effects varying by scar location and volume.

Area of Science:

  • Cardiovascular physiology
  • Medical device technology
  • Computational modeling

Background:

  • Catheter ablation is a common treatment for atrial fibrillation (AF), creating scar tissue in the left atrium to block electrical signals.
  • The mechanical consequences of ablation-induced scar on left atrial function remain incompletely understood.

Purpose of the Study:

  • To simulate various catheter ablation patterns using a computational model.
  • To determine the effects of different ablation strategies on left atrial mechanical function, including global and regional mechanics.

Main Methods:

  • A coupled finite-element and hemodynamic circuit model of the left atrium was utilized.
  • Simulations included step-wise pulmonary vein isolation (PVI), wide area circumferential ablation (WACA), and posterior ablation.
Keywords:
atrial fibrillationbiomechanicscardiac mechanicscatheter ablationfinite-element modelingleft atrium

Related Experiment Videos

  • Atrial pressure-volume relationships and regional wall motion were analyzed and compared across models.

    • Main Results:

    • Ablation increased passive stiffness and reduced the active work of the atrium.
    • Active emptying volume decreased significantly with increasing scar volume (up to 44%).
    • Wide area circumferential ablation (WACA) resulted in more severe reductions in active emptying and wall motion compared to PVI and posterior ablation patterns.

    Conclusions:

    • Simulated ablation negatively impacts atrial mechanical function, with effects dependent on scar volume and location.
    • Ablation in areas of high baseline myocardial motion led to greater functional depression.
    • Posterior wall ablation appeared less disruptive to overall atrial mechanics.