Structural defects lead to dynamic entrapment in cardiac electrophysiology

Area of Science:

• * Biophysics
• * Cardiac Electrophysiology
• * Nonlinear Dynamics

Background:

• * Biological networks with nonlinear dynamics can exhibit multiple behaviors (attractors).
• * Diseased hearts can switch between normal and reentrant rhythms, but healthy hearts resist abnormal rhythms.
• * The mechanism by which healthy cardiac networks can support multiple distinct behaviors remains unclear.

Purpose of the Study:

• * To investigate how anatomic defects can induce multi-stability in healthy cardiac networks.
• * To explore the role of electrophysiological properties and ectopic foci timing in cardiac multi-stability.
• * To introduce and define the concept of
• dynamic entrapment
• in cardiac function.

Main Methods:

• * Computational modeling of cardiac cell networks.
• * Simulation of electrophysiological properties and ectopic foci activation.
• * Analysis of system dynamics to identify multi-stability and hysteresis.

Main Results:

• * Anatomic defects, combined with specific electrophysiological properties and ectopic foci timing, can create multi-stability in healthy cardiac networks.
• * This multi-stability can lead to
• dynamic entrapment
• , where the heart becomes trapped in an aberrant attractor after transient changes.
• * A dissociation between clinical symptoms and underlying pathophysiology can arise from this dynamic entrapment.

Conclusions:

• * Cardiac multi-stability and dynamic entrapment can be induced by anatomic defects and altered electrophysiology.
• * Dynamic entrapment offers a potential mechanism for understanding chronic idiopathic illnesses with inconsistent clinical presentations.
• * Further research is warranted to explore the implications of dynamic entrapment in various physiological and pathological conditions.