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Multiple wavelets, rotors, and snakes in atrial fibrillation--a computer simulation study.

Matthias Reumann1, Julia Bohnert, Brigitte Osswald

  • 1Institute of Biomedical Engineering, Universitaet Karlsruhe (TH), Karlsruhe, Germany. mreumann@theiet.org <mreumann@theiet.org>

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Computer models show that pulmonary vein firing in realistic atrial anatomy can initiate atrial fibrillation (AF). Anatomical structures influence AF, with snake-like patterns emerging in heterogeneous regions.

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Area of Science:

  • Computational cardiology
  • Medical imaging and simulation
  • Electrophysiology

Background:

  • Atrial fibrillation (AF) is often attributed to multiple wavelets and rotors.
  • Recent observations in AF reveal snake-like excitation patterns.
  • Previous computer models used simplified anatomical representations.

Purpose of the Study:

  • To simulate pulmonary vein firing.
  • To investigate AF initiation and maintenance.
  • To utilize a realistic 3D atrial anatomical model.

Main Methods:

  • Simulated 35 ectopic foci around pulmonary veins with unidirectional conduction block.
  • Employed an adaptive cellular automaton for excitation propagation.
  • Utilized a realistic 3D atrial anatomy.

Main Results:

  • Successfully initiated atrial fibrillation in 65.7% of simulations.
  • Observed snake-like excitation patterns in anatomically heterogeneous regions.
  • Detected multiple wavelets and rotors in smooth atrial areas.

Conclusions:

  • Macroscopic anatomical structures significantly influence AF excitation propagation.
  • Multiple mechanisms contribute to the maintenance of atrial fibrillation.
  • Computer simulations provide insights into AF dynamics.