Spiral wave drift under optical feedback in cardiac tissue

Area of Science:

• Cardiology
• Biophysics
• Nonlinear Dynamics

Background:

• Spiral waves are key to excitation patterns in excitable media like cardiac tissue.
• Spiral wave drift is crucial for controlling their position and elimination, but traditional methods like electric fields are ineffective in cardiac tissue.
• Existing methods for controlling spiral waves, such as electric fields in the Belousov-Zhabotinsky reaction, do not translate to cardiac tissue.

Purpose of the Study:

• To propose and validate a novel method for inducing directed linear drift of spiral waves specifically in cardiac tissue.
• To demonstrate the efficacy of optical feedback control using photosensitive ion channels for manipulating spiral wave behavior.
• To investigate the applicability of this method with various light sources and cardiac models.

Main Methods:

• Utilized the FitzHugh-Nagumo model and a generic photosensitive ion channel model to simulate cardiac tissue.
• Implemented an optical feedback control system targeting photosensitive ion channels to induce spiral wave drift.
• Validated the method using both continuous and discrete light sources and a biophysically detailed Luo-Rudy model.

Main Results:

• The proposed optical feedback control method successfully induced directed linear drift of spiral waves in simulated cardiac tissue.
• The method proved effective with both continuous and discrete light sources across a range of light intensities.
• Spiral waves were effectively moved towards boundaries or eliminated through collisions, demonstrating precise control.

Conclusions:

• Optical feedback control via photosensitive ion channels offers a viable strategy for directed linear drift of spiral waves in cardiac tissue.
• This approach overcomes the limitations of electric field stimulation in cardiac systems.
• The findings suggest potential therapeutic applications for managing cardiac arrhythmias by controlling spiral wave dynamics.