A primary mechanism for spiral wave meandering

Area of Science:

• * Computational Biology
• * Biophysics
• * Cardiac Electrophysiology

Background:

• * Spiral waves are crucial in cardiac physiology and pathophysiology.
• * Meandering of these waves can lead to arrhythmias.
• * Understanding meandering dynamics is vital for cardiac health.

Purpose of the Study:

• * To investigate the underlying mechanisms of spiral wave meandering.
• * To identify factors influencing the stability and dynamics of meandering.
• * To predict conditions that increase susceptibility to meandering.

Main Methods:

• * Analysis of small perturbations to rotating action potential waves.
• * Examination of local linear dynamics at the action potential trailing edge.
• * Use of mathematical models and computer simulations.

Main Results:

• * Meandering originates from interactions between trailing edge dynamics and existing perturbations.
• * Wavefront curvature and head-tail interactions were not involved.
• * Increased susceptibility linked to wave tip proximity to rotation center, wider edges, and slower rotation speeds.

Conclusions:

• * Identified a specific interaction mechanism driving spiral wave meandering.
• * Characterized key features of action potentials that promote meandering.
• * Highlighted the complex interplay of tissue properties in regulating wave dynamics.